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Subject: bug#43513: json-c build failure (on armhf-linux) while trying to build u-boot
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Date: Sat, 19 Sep 2020 17:36:28 +0200
From: Danny Milosavljevic <dannym@HIDDEN>
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Hello,
there is a build failure in json-c:
$ guix environment -s armhf-linux --pure u-boot-a20-olinuxino-micro
[...]
running 'cmake' with arguments ("../json-c-0.14" "-DCMAKE_BUILD_TYPE=3DRelW=
ithDebInfo" "-DCMAKE_INSTALL_PREFIX=3D/gnu/store/yqaw63n8wmg7f2ncc24019z87m=
5cwhim-json-c-0.14" "-DCMAKE_INSTALL_LIBDIR=3Dlib" "-DCMAKE_INSTALL_RPATH_U=
SE_LINK_PATH=3DTRUE" "-DCMAKE_INSTALL_RPATH=3D/gnu/store/yqaw63n8wmg7f2ncc2=
4019z87m5cwhim-json-c-0.14/lib" "-DCMAKE_VERBOSE_MAKEFILE=3DON")
CMake Error at /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.=
16.5/share/cmake-3.16/Modules/CMakeCompilerIdDetection.cmake:26 (list):
list sub-command REMOVE_ITEM requires two or more arguments.
Call Stack (most recent call first):
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:211 (compiler_id_detection)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:230 (CMAKE_DETERMINE_COMPIL=
ER_ID_WRITE)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:32 (CMAKE_DETERMINE_COMPILE=
R_ID_BUILD)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCCompiler.cmake:116 (CMAKE_DETERMINE_COMPILE=
R_ID)
CMakeLists.txt:10 (project)
CMake Error at /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.=
16.5/share/cmake-3.16/Modules/CMakeCompilerIdDetection.cmake:26 (list):
list sub-command REMOVE_ITEM requires two or more arguments.
Call Stack (most recent call first):
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:211 (compiler_id_detection)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:230 (CMAKE_DETERMINE_COMPIL=
ER_ID_WRITE)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:32 (CMAKE_DETERMINE_COMPILE=
R_ID_BUILD)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCCompiler.cmake:116 (CMAKE_DETERMINE_COMPILE=
R_ID)
CMakeLists.txt:10 (project)
CMake Error at /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.=
16.5/share/cmake-3.16/Modules/CMakeCompilerIdDetection.cmake:26 (list):
list sub-command REMOVE_ITEM requires two or more arguments.
Call Stack (most recent call first):
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:211 (compiler_id_detection)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:230 (CMAKE_DETERMINE_COMPIL=
ER_ID_WRITE)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:32 (CMAKE_DETERMINE_COMPILE=
R_ID_BUILD)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCCompiler.cmake:116 (CMAKE_DETERMINE_COMPILE=
R_ID)
CMakeLists.txt:10 (project)
CMake Error at /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.=
16.5/share/cmake-3.16/Modules/CMakeCompilerIdDetection.cmake:26 (list):
list sub-command REMOVE_ITEM requires two or more arguments.
Call Stack (most recent call first):
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:211 (compiler_id_detection)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:230 (CMAKE_DETERMINE_COMPIL=
ER_ID_WRITE)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:32 (CMAKE_DETERMINE_COMPILE=
R_ID_BUILD)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCCompiler.cmake:116 (CMAKE_DETERMINE_COMPILE=
R_ID)
CMakeLists.txt:10 (project)
CMake Error at /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.=
16.5/share/cmake-3.16/Modules/CMakeCompilerIdDetection.cmake:26 (list):
list sub-command REMOVE_ITEM requires two or more arguments.
Call Stack (most recent call first):
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:211 (compiler_id_detection)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:230 (CMAKE_DETERMINE_COMPIL=
ER_ID_WRITE)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:32 (CMAKE_DETERMINE_COMPILE=
R_ID_BUILD)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCCompiler.cmake:116 (CMAKE_DETERMINE_COMPILE=
R_ID)
CMakeLists.txt:10 (project)
CMake Error at /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.=
16.5/share/cmake-3.16/Modules/CMakeCompilerIdDetection.cmake:26 (list):
list sub-command REMOVE_ITEM requires two or more arguments.
Call Stack (most recent call first):
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:211 (compiler_id_detection)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:230 (CMAKE_DETERMINE_COMPIL=
ER_ID_WRITE)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:32 (CMAKE_DETERMINE_COMPILE=
R_ID_BUILD)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCCompiler.cmake:116 (CMAKE_DETERMINE_COMPILE=
R_ID)
CMakeLists.txt:10 (project)
CMake Error at /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.=
16.5/share/cmake-3.16/Modules/CMakeCompilerIdDetection.cmake:26 (list):
list sub-command REMOVE_ITEM requires two or more arguments.
Call Stack (most recent call first):
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:211 (compiler_id_detection)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:230 (CMAKE_DETERMINE_COMPIL=
ER_ID_WRITE)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:32 (CMAKE_DETERMINE_COMPILE=
R_ID_BUILD)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCCompiler.cmake:116 (CMAKE_DETERMINE_COMPILE=
R_ID)
CMakeLists.txt:10 (project)
CMake Error at /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.=
16.5/share/cmake-3.16/Modules/CMakeCompilerIdDetection.cmake:26 (list):
list sub-command REMOVE_ITEM requires two or more arguments.
Call Stack (most recent call first):
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:211 (compiler_id_detection)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:230 (CMAKE_DETERMINE_COMPIL=
ER_ID_WRITE)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:32 (CMAKE_DETERMINE_COMPILE=
R_ID_BUILD)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCCompiler.cmake:116 (CMAKE_DETERMINE_COMPILE=
R_ID)
CMakeLists.txt:10 (project)
CMake Error at /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.=
16.5/share/cmake-3.16/Modules/CMakeCompilerIdDetection.cmake:26 (list):
list sub-command REMOVE_ITEM requires two or more arguments.
Call Stack (most recent call first):
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:211 (compiler_id_detection)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:230 (CMAKE_DETERMINE_COMPIL=
ER_ID_WRITE)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:32 (CMAKE_DETERMINE_COMPILE=
R_ID_BUILD)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCCompiler.cmake:116 (CMAKE_DETERMINE_COMPILE=
R_ID)
CMakeLists.txt:10 (project)
CMake Error at /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.=
16.5/share/cmake-3.16/Modules/CMakeCompilerIdDetection.cmake:26 (list):
list sub-command REMOVE_ITEM requires two or more arguments.
Call Stack (most recent call first):
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:211 (compiler_id_detection)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:230 (CMAKE_DETERMINE_COMPIL=
ER_ID_WRITE)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCompilerId.cmake:32 (CMAKE_DETERMINE_COMPILE=
R_ID_BUILD)
/gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cm=
ake-3.16/Modules/CMakeDetermineCCompiler.cmake:116 (CMAKE_DETERMINE_COMPILE=
R_ID)
CMakeLists.txt:10 (project)
-- The C compiler identification is unknown
[...]
-- Could NOT find Doxygen (missing: DOXYGEN_EXECUTABLE)=20
Warning: doxygen not found, the 'doc' target will not be included
-- Configuring incomplete, errors occurred!
See also "/tmp/guix-build-json-c-0.14.drv-0/build/CMakeFiles/CMakeOutput.lo=
g".
See also "/tmp/guix-build-json-c-0.14.drv-0/build/CMakeFiles/CMakeError.log=
".
command "cmake" "../json-c-0.14" "-DCMAKE_BUILD_TYPE=3DRelWithDebInfo" "-DC=
MAKE_INSTALL_PREFIX=3D/gnu/store/yqaw63n8wmg7f2ncc24019z87m5cwhim-json-c-0.=
14" "-DCMAKE_INSTALL_LIBDIR=3Dlib" "-DCMAKE_INSTALL_RPATH_USE_LINK_PATH=3DT=
RUE" "-DCMAKE_INSTALL_RPATH=3D/gnu/store/yqaw63n8wmg7f2ncc24019z87m5cwhim-j=
son-c-0.14/lib" "-DCMAKE_VERBOSE_MAKEFILE=3DON" failed with status 1
Compiling the C compiler identification source file "CMakeCCompilerId.c" fa=
iled.
Compiler: /gnu/store/z8954h4nvgxwcyy2in8c1l11g199m2yb-gcc-7.5.0/bin/gcc=20
Build flags:=20
Id flags: =20
The output was:
1
CMakeCCompilerId.c:20:52: error: expected =E2=80=98,=E2=80=99 or =E2=80=98;=
=E2=80=99 before =E2=80=98COMPILER_ID=E2=80=99
char const* info_compiler =3D "INFO" ":" "compiler[" COMPILER_ID "]";
^~~~~~~~~~~
[...]
Furthermore, I'd like to ask: Why is json-c a dependency in the first place=
?
$ LC_ALL=3DC guix describe
Generation 124 Sep 18 2020 22:27:08 (current)
guix e6ba735
repository URL: https://git.savannah.gnu.org/git/guix.git
branch: master
commit: e6ba735d685886e747a831e43a501488e15d97c7
heads 50b97d4
repository URL: https://github.com/daym/heads-guix.git
branch: wip-musl
commit: 50b97d446ebafd0be7a0e19d87cd236882093244
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Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Danny Milosavljevic <dannym@HIDDEN> Subject: bug#43513: Acknowledgement (json-c build failure (on armhf-linux) while trying to build u-boot) Message-ID: <handler.43513.B.160052985811860.ack <at> debbugs.gnu.org> References: <20200919173628.423331da@HIDDEN> X-Gnu-PR-Message: ack 43513 X-Gnu-PR-Package: guix Reply-To: 43513 <at> debbugs.gnu.org Date: Sat, 19 Sep 2020 15:38:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-guix@HIDDEN If you wish to submit further information on this problem, please send it to 43513 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 43513: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D43513 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
X-Loop: help-debbugs@HIDDEN
Subject: bug#43513: json-c build failure (on armhf-linux) while trying to build u-boot
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Date: Sat, 19 Sep 2020 23:05:14 +0200
From: Danny Milosavljevic <dannym@HIDDEN>
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More info:
https://gitlab.kitware.com/cmake/cmake/-/issues/20568
https://gitlab.kitware.com/utils/kwsys/-/merge_requests/187
> Furthermore, I'd like to ask: Why is json-c a dependency in the first pla=
ce ?
Because of sdl2. I've removed sdl2 from the native-inputs of u-boot
and added it to the native-inputs of u-boot-tools in guix master
commit 6b1253718d1d660e7a91bd59a96bdb16d7c5e0b3.
So now only this fails:
$ guix build -s armhf-linux u-boot-tools
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Subject: bug#43513: json-c build failure (on armhf-linux) while trying to build u-boot
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Hi,
I found the underlying cause of the problem with qemu transparent emulation:
* qemu transparent emulator has 64 bit registers
* the thing it's emulating has 32 bit registers
* The glibc in the distro that is running in the emulator is using getdents=
64
(on 32 bits!) and then (rightfully) checking whether d_off and the inode nu=
mber
fit into their own (32 bits/entry) struct, which they don't (the thing they=
get
from the kernel is 64 bits/entry).
See also https://lore.kernel.org/lkml/20181229015453.GA6310@HIDDEN=
ead.org/T/
for an analysis.
See also https://sourceware.org/bugzilla/show_bug.cgi?id=3D23960 for a disc=
ussion.
Least-shitty workaround: Use a 32-bit qemu (yes, a qemu compiled on 32 bit)
on a 64 bit machine for transparent emulation of ANOTHER 32-bit machine.
That way, the kernel can know that there's a 32 bit user lurking somewhere =
up
the call chain that is calling getdents64 and is not actually able to proce=
ss the
result. "The truth? It can't handle the truth."
The right fix: One could also tell all the packages in the emulated
system to use the large file size API (-D_FILE_OFFSET_BITS=3D64 and co). I=
n this
case cmake is affected--but it could be any number of things. I think that=
that
is the only good fix (we could also add a compile-time check whether <diren=
t.h>
has been included without anyone specifying -D_FILE_OFFSET_BITS=3D64--that =
would
make finding these problems a LOT easier; if possible, emit that compile-ti=
me
error only if readdir is actually called anywhere).
For the workaround, we could adapt Guix system's gnu/services/virtualizatio=
n.scm
so it uses a qemu built for the 32-bit variant of the host architecture if =
it's
emulating a 32 bit system.
So qemu could be compiled for i686 if the host is x86_64 and the emulated
system is armhf,
qemu could be compiled for armhf if the host is aarch64 and the emulated sy=
stem
is armhf and so on.
That also means that if a host system is 64 bits and DOES NOT HAVE a 32 bit
pendant target, then the emulation of a 32 bit system is going to be imperf=
ect.
One way to fix that would be to fix the kernel to accept an argument on
the getdents64 syscall (and similar ones) that tells it whether the user wa=
nts
to have 64 bit offsets or 32 bit offsets[1]. Right now, from user space, t=
hat
is only possible via process personality flags. And those would switch the
entire qemu executable over to 32 bits, which we don't want (qemu itself has
to do stuff using kernel syscalls, so it needs to be capable of 64 bits
if it itself is 64 bits). And I think that even that case is not being
handled in the kernel correctly. So this fix cannot be done.
@Ludo:
Anyway, I have a question on how to replicate what "guix build --target=3Di=
686..."
does, in the guix service definition. How can I make it use
package-cross-derivation instead of package-derivation ?
See attachment.
With the attachment and the service definition
(service qemu-binfmt-service-type
(qemu-binfmt-configuration
(platforms (lookup-qemu-platforms "arm"))
(guix-support? #t)))
in order to emulate ARM on x86_64 I eventually get:
>Building qemu-minimal for i686
(That's what I want!)
>[...]
>starting phase `configure'
>
>ERROR: pkg-config binary 'i686-unknown-linux-gnu-pkg-config' not found
pkg-config has not been cross-compiled...
That's because it's not using package-cross-derivation, I guess.
>command "./configure" "--cc=3D/gnu/store/rn75fm7adgx3pw5j8pg3bczfqq1y17lk-=
gcc-7.5.0/bin/gcc" "--host-cc=3D/gnu/store/rn75fm7adgx3pw5j8pg3bczfqq1y17lk=
-gcc-7.5.0/bin/gcc" "--disable-debug-info" "--enable-virtfs" "--prefix=3D/g=
nu/store/80ljf47lrh8arrzjmkrrqxghc0k67b3s-qemu-minimal-5.1.0" "--sysconfdir=
=3D/etc" "--cross-prefix=3Di686-unknown-linux-gnu-" "--target-list=3Di386-s=
oftmmu,x86_64-softmmu" failed with status 1
I think that "--cc" should use ,(cc-for-target) at all times.
Better this:
diff --git a/gnu/packages/virtualization.scm b/gnu/packages/virtualization.=
scm
index 53e9dde125..bf712afd4a 100644
--- a/gnu/packages/virtualization.scm
+++ b/gnu/packages/virtualization.scm
@@ -227,7 +227,7 @@
(setenv "LDFLAGS" "-lrt")
(apply invoke
`("./configure"
- ,(string-append "--cc=3D" (which "gcc"))
+ ,(string-append "--cc=3D" ,(cc-for-target))
;; Some architectures insist on using HOST_CC
,(string-append "--host-cc=3D" (which "gcc"))
"--disable-debug-info" ; save build space
[1] A way for userspace to tell the kernel that is to use getdents instad of
getdents64 on 32 bits, like it used to. But they don't want to do that any=
more.
Another way would be for qemu to translate a syscall getdents64 from the gu=
est
to getdents on the host if the machine they are emulating is 32 bits. But =
that
would mean that getdents on a 64 bit host would still have to act like it's
32 bits and translate the d_off accordingly. That's not guaranteed[2].
Or even using the old readdir syscall.
[2] Linux-5.8.8:
[... CONFIG_COMPAT ...]
SYSCALL_DEFINE3(getdents, unsigned int, fd,
struct linux_dirent __user *, dirent, unsigned int, count)
{
struct fd f;
struct getdents_callback buf =3D {
.ctx.actor =3D filldir,
.count =3D count,
.current_dir =3D dirent
};
int error;
f =3D fdget_pos(fd);
if (!f.file)
return -EBADF;
error =3D iterate_dir(f.file, &buf.ctx);
if (error >=3D 0)
error =3D buf.error;
if (buf.prev_reclen) {
struct linux_dirent __user * lastdirent;
lastdirent =3D (void __user *)buf.current_dir - buf.prev_re=
clen;
if (put_user(buf.ctx.pos, &lastdirent->d_off))
error =3D -EFAULT;
else
error =3D count - buf.count;
}
fdput_pos(f);
return error;
}
It's not guaranteed.
--MP_/Viv1tPanKIDOnV68zPcOVbm
Content-Type: text/x-patch
Content-Transfer-Encoding: quoted-printable
Content-Disposition: attachment;
filename=services-qemu-transparent-emulation-make-more-exact.patch
diff --git a/gnu/services/virtualization.scm b/gnu/services/virtualization.=
scm
index 20e104f48c..77f15ba07b 100644
--- a/gnu/services/virtualization.scm
+++ b/gnu/services/virtualization.scm
@@ -23,6 +23,7 @@
#:use-module (gnu bootloader grub)
#:use-module (gnu image)
#:use-module (gnu packages admin)
+ #:use-module (gnu packages cross-base)
#:use-module (gnu packages ssh)
#:use-module (gnu packages virtualization)
#:use-module (gnu services base)
@@ -554,12 +555,13 @@ potential infinite waits blocking libvirt."))
=20
;; Platforms that QEMU can emulate.
(define-record-type <qemu-platform>
- (qemu-platform name family magic mask)
+ (qemu-platform name family register-width magic mask)
qemu-platform?
- (name qemu-platform-name) ;string
- (family qemu-platform-family) ;string
- (magic qemu-platform-magic) ;bytevector
- (mask qemu-platform-mask)) ;bytevector
+ (name qemu-platform-name) ;string
+ (family qemu-platform-family) ;string
+ (register-width qemu-platform-register-width) ;int, in b=
its
+ (magic qemu-platform-magic) ;bytevector
+ (mask qemu-platform-mask)) ;bytevector
=20
(define-syntax bv
(lambda (s)
@@ -576,123 +578,123 @@ potential infinite waits blocking libvirt."))
;;; 'scripts/qemu-binfmt-conf.sh' in QEMU.
=20
(define %i386
- (qemu-platform "i386" "i386"
+ (qemu-platform "i386" "i386" 32
(bv "\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\=
x00\x02\x00\x03\x00")
(bv "\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff=
\xff\xff\xff\xfe\xff\xff\xff")))
=20
(define %i486
- (qemu-platform "i486" "i386"
+ (qemu-platform "i486" "i386" 32
(bv "\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\=
x00\x02\x00\x06\x00")
(bv "\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff=
\xff\xff\xff\xfe\xff\xff\xff")))
=20
(define %alpha
- (qemu-platform "alpha" "alpha"
+ (qemu-platform "alpha" "alpha" 64
(bv "\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\=
x00\x02\x00\x26\x90")
(bv "\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff=
\xff\xff\xff\xfe\xff\xff\xff")))
=20
(define %arm
- (qemu-platform "arm" "arm"
+ (qemu-platform "arm" "arm" 32
(bv "\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\=
x00\x02\x00\x28\x00")
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff=
\xff\xff\xff\xfe\xff\xff\xff")))
=20
(define %armeb
- (qemu-platform "armeb" "arm"
+ (qemu-platform "armeb" "arm" 32
(bv "\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\=
x00\x00\x02\x00\x28")
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff=
\xff\xff\xff\xff\xfe\xff\xff")))
=20
(define %sparc
- (qemu-platform "sparc" "sparc"
+ (qemu-platform "sparc" "sparc" 32 ; FIXME check
(bv "\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\=
x00\x00\x02\x00\x02")
(bv "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff=
\xff\xff\xff\xff\xfe\xff\xff")))
=20
(define %sparc32plus
- (qemu-platform "sparc32plus" "sparc"
+ (qemu-platform "sparc32plus" "sparc" 32 ; FIXME check
(bv "\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\=
x00\x00\x02\x00\x12")
(bv "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff=
\xff\xff\xff\xff\xfe\xff\xff")))
=20
(define %ppc
- (qemu-platform "ppc" "ppc"
+ (qemu-platform "ppc" "ppc" 32
(bv "\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\=
x00\x00\x02\x00\x14")
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff=
\xff\xff\xff\xff\xfe\xff\xff")))
=20
(define %ppc64
- (qemu-platform "ppc64" "ppc"
+ (qemu-platform "ppc64" "ppc" 64
(bv "\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\=
x00\x00\x02\x00\x15")
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff=
\xff\xff\xff\xff\xfe\xff\xff")))
=20
(define %ppc64le
- (qemu-platform "ppc64le" "ppcle"
+ (qemu-platform "ppc64le" "ppcle" 64
(bv "\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\=
x00\x02\x00\x15\x00")
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff=
\xff\xff\xff\xfe\xff\xff\x00")))
=20
(define %m68k
- (qemu-platform "m68k" "m68k"
+ (qemu-platform "m68k" "m68k" 32
(bv "\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\=
x00\x00\x02\x00\x04")
(bv "\xff\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff=
\xff\xff\xff\xff\xfe\xff\xff")))
=20
;; XXX: We could use the other endianness on a MIPS host.
(define %mips
- (qemu-platform "mips" "mips"
+ (qemu-platform "mips" "mips" 32
(bv "\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\=
x00\x00\x02\x00\x08")
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff=
\xff\xff\xff\xff\xfe\xff\xff")))
=20
(define %mipsel
- (qemu-platform "mipsel" "mips"
+ (qemu-platform "mipsel" "mips" 32
(bv "\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\=
x00\x02\x00\x08\x00")
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff=
\xff\xff\xff\xfe\xff\xff\xff")))
=20
(define %mipsn32
- (qemu-platform "mipsn32" "mips"
+ (qemu-platform "mipsn32" "mips" 32 ; FIXME check
(bv "\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\=
x00\x00\x02\x00\x08")
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff=
\xff\xff\xff\xff\xfe\xff\xff")))
=20
(define %mipsn32el
- (qemu-platform "mipsn32el" "mips"
+ (qemu-platform "mipsn32el" "mips" 32 ; FIXME check
(bv "\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\=
x00\x02\x00\x08\x00")
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff=
\xff\xff\xff\xfe\xff\xff\xff")))
=20
(define %mips64
- (qemu-platform "mips64" "mips"
+ (qemu-platform "mips64" "mips" 64
(bv "\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\=
x00\x00\x02\x00\x08")
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff=
\xff\xff\xff\xff\xfe\xff\xff")))
=20
(define %mips64el
- (qemu-platform "mips64el" "mips"
+ (qemu-platform "mips64el" "mips" 64
(bv "\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\=
x00\x02\x00\x08\x00")
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff=
\xff\xff\xff\xfe\xff\xff\xff")))
=20
(define %riscv32
- (qemu-platform "riscv32" "riscv"
+ (qemu-platform "riscv32" "riscv" 32 ; FIXME
(bv "\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\=
x00\x02\x00\xf3\x00")
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff=
\xff\xff\xff\xfe\xff\xff\xff")))
=20
(define %riscv64
- (qemu-platform "riscv64" "riscv"
+ (qemu-platform "riscv64" "riscv" 64
(bv "\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\=
x00\x02\x00\xf3\x00")
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff=
\xff\xff\xff\xfe\xff\xff\xff")))
=20
(define %sh4
- (qemu-platform "sh4" "sh4"
+ (qemu-platform "sh4" "sh4" 32
(bv "\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\=
x00\x02\x00\x2a\x00")
(bv "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff=
\xff\xff\xff\xfe\xff\xff\xff")))
=20
(define %sh4eb
- (qemu-platform "sh4eb" "sh4"
+ (qemu-platform "sh4eb" "sh4" 32
(bv "\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\=
x00\x00\x02\x00\x2a")
(bv "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff=
\xff\xff\xff\xff\xfe\xff\xff")))
=20
(define %s390x
- (qemu-platform "s390x" "s390x"
+ (qemu-platform "s390x" "s390x" 64
(bv "\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\=
x00\x00\x02\x00\x16")
(bv "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff=
\xff\xff\xff\xff\xfe\xff\xff")))
=20
(define %aarch64
- (qemu-platform "aarch64" "arm"
+ (qemu-platform "aarch64" "arm" 64
(bv "\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\=
x00\x02\x00\xb7\x00")
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff=
\xff\xff\xff\xfe\xff\xff\xff")))
=20
(define %hppa
- (qemu-platform "hppa" "hppa"
+ (qemu-platform "hppa" "hppa" 32
(bv "\x7f\x45\x4c\x46\x01\x02\x01\x00\x00\x00\x00\x00\x00=
\x00\x00\x00\x00\x02\x00\x0f")
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff=
\xff\xff\xff\xff\xfe\xff\xff")))
=20
@@ -712,12 +714,48 @@ potential infinite waits blocking libvirt."))
qemu-binfmt-configuration make-qemu-binfmt-configuration
qemu-binfmt-configuration?
(qemu qemu-binfmt-configuration-qemu
- (default qemu))
+ (default qemu-minimal))
(platforms qemu-binfmt-configuration-platforms
(default '())) ;safest default
(guix-support? qemu-binfmt-configuration-guix-support?
(default #f)))
=20
+(define (register-width system)
+ (match (%current-system)
+ ("i686-linux" 32)
+ ("armhf-linux" 32)
+ ("aarch64-linux" 64)
+ ("x86_64-linux" 64)))
+
+(define (closest-cross-compiled-qemu qemu target-bits)
+ "Cross-compile QEMU for the given TARGET-BITS platform that is closest to
+the actual host architecture, if possible. This is in order to prevent
+https://lore.kernel.org/lkml/20181229015453.GA6310@HIDDEN/=
T/"
+ (define (cross-compiled-qemu target)
+ (package
+ (inherit qemu)
+ (arguments
+ (substitute-keyword-arguments (package-arguments qemu)
+ ((#:configure-flags flags)
+ `(cons ,(string-append "--cross-prefix=3D" target "-")
+ ,flags))))
+ (native-inputs
+ `(("cross-gcc" ,(cross-gcc target))
+ ("cross-binutils" ,(cross-binutils target))
+ ,@(package-native-inputs qemu)))))
+ (match target-bits
+ (64 qemu)
+ (32 (match (register-width (%current-system))
+ (32 qemu)
+ (64 (match (%current-system)
+ ("x86_64-linux"
+ (cross-compiled-qemu (nix-system->gnu-triplet "i686-linux")))
+ ("aarch64-linux"
+ (cross-compiled-qemu "arm-linux-gnueabihf"))
+ (_ (begin
+ ;; TODO: Print warning
+ qemu))))))))
+
(define (qemu-platform->binfmt qemu platform)
"Return a gexp that evaluates to a binfmt string for PLATFORM, using the
given QEMU package."
@@ -732,12 +770,13 @@ given QEMU package."
(bytevector->u8-list bv))))
=20
(match platform
- (($ <qemu-platform> name family magic mask)
+ (($ <qemu-platform> name family register-width magic mask)
;; See 'Documentation/binfmt_misc.txt' in the kernel.
#~(string-append ":qemu-" #$name ":M::"
#$(bytevector->binfmt-string magic)
":" #$(bytevector->binfmt-string mask)
- ":" #$(file-append qemu "/bin/qemu-" name)
+ ":" #$(file-append (closest-cross-compiled-qemu qemu=
register-width)
+ "/bin/qemu-" name)
":" ;FLAGS go here
))))
=20
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Subject: bug#43513: json-c build failure (on armhf-linux) while trying to build u-boot
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Kernel side: https://bugzilla.kernel.org/show_bug.cgi?id=3D205957
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Subject: bug#43513: json-c build failure (on armhf-linux) while trying to build u-boot
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> to have 64 bit offsets or 32 bit offsets[1]. Right now, from user space,=
that
> is only possible via process personality flags.
Or via CONFIG_X86_X32, which exposes extra syscalls ON x86_64 ONLY.
I guess that would be better than nothing--although glibc would have to look
seriously strange to use those: Even on ARM, it would have to try this sys=
call
first, and then the normal one. I don't think that that is reasonable to a=
dd
to glibc.
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Hi Danny!
Danny Milosavljevic <dannym@HIDDEN> skribis:
> I found the underlying cause of the problem with qemu transparent emulati=
on:
>
> * qemu transparent emulator has 64 bit registers
> * the thing it's emulating has 32 bit registers
> * The glibc in the distro that is running in the emulator is using getden=
ts64
> (on 32 bits!) and then (rightfully) checking whether d_off and the inode =
number
> fit into their own (32 bits/entry) struct, which they don't (the thing th=
ey get
> from the kernel is 64 bits/entry).
Looks very much like the CMake-on-emulated-hardware issue several of us
encountered before:
https://issues.guix.gnu.org/38454#3
https://issues.guix.gnu.org/42448
Glad you found an explanation!
(I see you also posted <https://issues.guix.gnu.org/43591>.)
> See also https://lore.kernel.org/lkml/20181229015453.GA6310@HIDDEN=
adead.org/T/
> for an analysis.
>
> See also https://sourceware.org/bugzilla/show_bug.cgi?id=3D23960 for a di=
scussion.
Woow.
> Least-shitty workaround: Use a 32-bit qemu (yes, a qemu compiled on 32 bi=
t)
> on a 64 bit machine for transparent emulation of ANOTHER 32-bit machine.
> That way, the kernel can know that there's a 32 bit user lurking somewher=
e up
> the call chain that is calling getdents64 and is not actually able to pro=
cess the
> result. "The truth? It can't handle the truth."
OK.
> The right fix: One could also tell all the packages in the emulated
> system to use the large file size API (-D_FILE_OFFSET_BITS=3D64 and co). =
In this
> case cmake is affected--but it could be any number of things. I think th=
at that
> is the only good fix (we could also add a compile-time check whether <dir=
ent.h>
> has been included without anyone specifying -D_FILE_OFFSET_BITS=3D64--tha=
t would
> make finding these problems a LOT easier; if possible, emit that compile-=
time
> error only if readdir is actually called anywhere).
Yes; that user-space should be built with -D_FILE_OFFSET_BITS=3D64 is also
the conclusion at
<https://sourceware.org/bugzilla/show_bug.cgi?id=3D23960#c32>.
Let=E2=80=99s fix CMake (and JSON-C?) in =E2=80=98core-updates=E2=80=99 or =
=E2=80=98staging=E2=80=99 (using a
graft for CMake wouldn=E2=80=99t help because CMake is used at build time.)
> +(define (closest-cross-compiled-qemu qemu target-bits)
> + "Cross-compile QEMU for the given TARGET-BITS platform that is closest=
to
> +the actual host architecture, if possible. This is in order to prevent
> +https://lore.kernel.org/lkml/20181229015453.GA6310@HIDDEN=
g/T/"
> + (define (cross-compiled-qemu target)
> + (package
> + (inherit qemu)
> + (arguments
> + (substitute-keyword-arguments (package-arguments qemu)
> + ((#:configure-flags flags)
> + `(cons ,(string-append "--cross-prefix=3D" target "-")
> + ,flags))))
> + (native-inputs
> + `(("cross-gcc" ,(cross-gcc target))
> + ("cross-binutils" ,(cross-binutils target))
> + ,@(package-native-inputs qemu)))))
> + (match target-bits
> + (64 qemu)
> + (32 (match (register-width (%current-system))
> + (32 qemu)
> + (64 (match (%current-system)
> + ("x86_64-linux"
> + (cross-compiled-qemu (nix-system->gnu-triplet "i686-linux"=
)))
> + ("aarch64-linux"
> + (cross-compiled-qemu "arm-linux-gnueabihf"))
> + (_ (begin
> + ;; TODO: Print warning
> + qemu))))))))
It doesn=E2=80=99t make sense to cross-compile from x86_64 to i686. Instea=
d we
should use a native build, but an i686 one:
(package/inherit qemu
(arguments `(#:system "i686-linux" ,@(package-arguments qemu))))
Likewise for AArch64/ARMv7.
How does that sound?
Thanks,
Ludo=E2=80=99.
Received: (at control) by debbugs.gnu.org; 25 Sep 2020 10:14:36 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Fri Sep 25 06:14:36 2020 Received: from localhost ([127.0.0.1]:42751 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1kLkkO-0001aM-M2 for submit <at> debbugs.gnu.org; Fri, 25 Sep 2020 06:14:36 -0400 Received: from eggs.gnu.org ([209.51.188.92]:35202) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <ludo@HIDDEN>) id 1kLkkN-0001a6-KQ for control <at> debbugs.gnu.org; Fri, 25 Sep 2020 06:14:35 -0400 Received: from fencepost.gnu.org ([2001:470:142:3::e]:55059) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from <ludo@HIDDEN>) id 1kLkkI-0006yT-Dy for control <at> debbugs.gnu.org; Fri, 25 Sep 2020 06:14:30 -0400 Received: from [2a01:e0a:1d:7270:af76:b9b:ca24:c465] (port=60842 helo=ribbon) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from <ludo@HIDDEN>) id 1kLkkG-0006bg-R7 for control <at> debbugs.gnu.org; Fri, 25 Sep 2020 06:14:30 -0400 Date: Fri, 25 Sep 2020 12:14:27 +0200 Message-Id: <87v9g217uk.fsf@HIDDEN> To: control <at> debbugs.gnu.org From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN> Subject: control message for bug #43513 MIME-version: 1.0 Content-type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: control X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) retitle 43513 'getdents' misbehaves when emulating 32-bit code on a 64-bit-kernel host quit
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Subject: bug#43513: json-c build failure (on armhf-linux) while trying to build u-boot
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Hi Ludo,
On Fri, 25 Sep 2020 12:13:40 +0200
Ludovic Court=C3=A8s <ludo@HIDDEN> wrote:
> Let=E2=80=99s fix CMake (and JSON-C?) in =E2=80=98core-updates=E2=80=99 o=
r =E2=80=98staging=E2=80=99 (using a
> graft for CMake wouldn=E2=80=99t help because CMake is used at build time=
.)
Sure--cmake upstream will fix it anyway and make a new release.
But I now opened bug# 43591 on guix-patches in order to find all the OTHER
problems this causes we didn't see yet. I already ran it on my laptop in
order to find all the users trying to stick a 64-bit value into a 32-bit
slot and it looks very bad--there are instances of this problem in libstdc+=
+,
binutils bfd etcetc.
I suggest to delete all ARM substitutes that were built on x86_64 machines
and disable the builders using x86_64 to build ARM stuff in the mean time.
What that has built is VERY MUCH not reliable since readdir() was broken
sporadically--and compilers need that :P
> It doesn=E2=80=99t make sense to cross-compile from x86_64 to i686. Inst=
ead we
> should use a native build, but an i686 one:
>=20
> (package/inherit qemu
> (arguments `(#:system "i686-linux" ,@(package-arguments qemu))))
Sure.
I'm still hoping we can skip the workaround and do the right thing instead
(compiling everything with -D_FILE_OFFSET_BITS=3D64 regardless of architect=
ure).
I thought this matter with making everyone use LFS was settled in about
2007--but no, here we go again :(
Even if we did the workaround with qemu here, that still means the kernel
(via a compatibility layer) is going to lie to qemu about file offsets and
directory entry hashes. That doesn't sound good for reproducibility.
Also, I want to be clear that qemu is not at fault here.
It's fundamentally unsound to call getdents64 and expect a value with less
than 64 bits back. But that is what glibc does.
Users (other packages) who use _FILE_OFFSET_BITS=3D32 (by not setting
_FILE_OFFSET_BITS at all) in 2020, those are at fault.
> Likewise for AArch64/ARMv7.
I do not think the X86_32 compatibility layer works on aarch64, so now we h=
ave
a problem. That means building stuff for ARMv7 on aarch64 is not reliable =
at
all.
The right fix is to always use "-D_FILE_OFFSET_BITS=3D64" in user space. T=
hen
none of this weird stuff needs to be done.
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Subject: bug#43513: json-c build failure (on armhf-linux) while trying to build u-boot
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From: Danny Milosavljevic <dannym@HIDDEN>
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On Fri, 25 Sep 2020 13:13:22 +0200
Danny Milosavljevic <dannym@HIDDEN> wrote:
> I do not think the X86_32 compatibility layer works on aarch64, so now we=
have
> a problem. That means building stuff for ARMv7 on aarch64 is not reliabl=
e at
> all.
Hmm.
Could I have access to a aarch64 build machine? Or am I able to cause
a aarch64 build machine to evaluate a new wip branch?
I want to find out what it actually does in the case that aarch64 is used to
run armv7 stuff. Does it have a compat layer in the kernel or not?
How about all the other 64 bit architectures that have a 32 bit compat
fallback in hardware? Do those have a compat layer in the kernel or not?
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Subject: bug#43513: json-c build failure (on armhf-linux) while trying to build u-boot
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Danny Milosavljevic <dannym@HIDDEN> skribis:
> On Fri, 25 Sep 2020 13:13:22 +0200
> Danny Milosavljevic <dannym@HIDDEN> wrote:
>
>> I do not think the X86_32 compatibility layer works on aarch64, so now w=
e have
>> a problem. That means building stuff for ARMv7 on aarch64 is not reliab=
le at
>> all.
>
> Hmm.
>
> Could I have access to a aarch64 build machine?
You=E2=80=99re listed in overdrive.scm in maintenance.git, so you must have
access to overdrive1.guixsd.org:52522.
Ludo=E2=80=99.
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Subject: bug#43513: json-c build failure (on armhf-linux) while trying to build u-boot
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Danny Milosavljevic <dannym@HIDDEN> skribis:
> On Fri, 25 Sep 2020 12:13:40 +0200
> Ludovic Court=C3=A8s <ludo@HIDDEN> wrote:
>
>> Let=E2=80=99s fix CMake (and JSON-C?) in =E2=80=98core-updates=E2=80=99 =
or =E2=80=98staging=E2=80=99 (using a
>> graft for CMake wouldn=E2=80=99t help because CMake is used at build tim=
e.)
>
> Sure--cmake upstream will fix it anyway and make a new release.
>
> But I now opened bug# 43591 on guix-patches in order to find all the OTHER
> problems this causes we didn't see yet. I already ran it on my laptop in
> order to find all the users trying to stick a 64-bit value into a 32-bit
> slot and it looks very bad--there are instances of this problem in libstd=
c++,
> binutils bfd etcetc.
Hmm, it=E2=80=99s this bad?
> I suggest to delete all ARM substitutes that were built on x86_64 machines
> and disable the builders using x86_64 to build ARM stuff in the mean time.
> What that has built is VERY MUCH not reliable since readdir() was broken
> sporadically--and compilers need that :P
What are the odds of a build succeeding in the presence of broken
getdents/readdir? Wouldn=E2=80=99t such builds simply fail (as in the CMake
case), as opposed to succeeding but somehow producing invalid binaries?
We can still disabled emulated builds on ci.guix.gnu.org, but let=E2=80=99s
first make sure we understand the practical impact of this bug.
> I thought this matter with making everyone use LFS was settled in about
> 2007--but no, here we go again :(
Yeah. :-/
Ludo=E2=80=99.
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Hi Ludo,
On Fri, 25 Sep 2020 18:02:54 +0200
Ludovic Court=C3=A8s <ludo@HIDDEN> wrote:
> What are the odds of a build succeeding in the presence of broken
> getdents/readdir? Wouldn=E2=80=99t such builds simply fail (as in the CM=
ake
> case), as opposed to succeeding but somehow producing invalid binaries?
I don't know what hashing mechanism ext4 uses, but I guess the odds are not
that high IF THE DIRECTORY IS RANDOM. If it's crafted by a malicious perso=
n,
all bets are off.
However, notice that glibc can only fail out of readdir once it gets an *ac=
tual*
value >=3D 2**32. It's totally possible in principle to have a directory w=
ith
200 entries, the first 100 of which have d_off < 2**32, and the 101st has
d_off >=3D 2**32. Readdir will only stop after having given back 100 entri=
es
to the caller. The caller most likely will process those 100 entries.
That's it, you've just forgotten to install/copy/read/whatever half the fil=
es.
Technically the caller could examine errno to find out that something bad
happened while using readdir, but odds are that they don't (I haven't seen
anyone do that in my entire career)--and also the error code they are using
is undocumented[1]. So even a person who would check wouldn't expect this
error value (errno =3D=3D EOVERFLOW). In short, it won't work in practice.
> We can still disabled emulated builds on ci.guix.gnu.org, but let=E2=80=
=99s
> first make sure we understand the practical impact of this bug.
We need non-emulated builds to compare.
If a real ARM machine uses substitutes for anything, it probably picks up
now-untrustworthy builds made by x86_64 for ARM and builds on top of those.
Or don't they use substitutes?
In that case everything would be OK-ish.
Otherwise huge mess...
[1] "man getdents64" does not list EOVERFLOW--at least not for me.
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Hi Ludo,
On Fri, 25 Sep 2020 18:00:05 +0200
Ludovic Court=C3=A8s <ludo@HIDDEN> wrote:
> You=E2=80=99re listed in overdrive.scm in maintenance.git, so you must ha=
ve
> access to overdrive1.guixsd.org:52522.
Indeed, I do.
Thanks!
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> [1] "man getdents64" does not list EOVERFLOW--at least not for me.
I meant "man readdir"
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Subject: bug#43513: json-c build failure (on armhf-linux) while trying to build u-boot
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Hi Ludo,
On Fri, 25 Sep 2020 18:25:42 +0200
Danny Milosavljevic <dannym@HIDDEN> wrote:
> On Fri, 25 Sep 2020 18:00:05 +0200
> Ludovic Court=C3=A8s <ludo@HIDDEN> wrote:
>=20
> > You=E2=80=99re listed in overdrive.scm in maintenance.git, so you must =
have
> > access to overdrive1.guixsd.org:52522. =20
>=20
> Indeed, I do.
>=20
> Thanks!
I'd like to test what happens if one builds json-c on an aarch64 host
for i686.
Could we enable qemu-binfmt for i686 on an aarch64 host for me to test it?
One machine is enough--I'd just run
guix environment -s i686-linux gcc-toolchain -- gcc -o a00 -D_FILE_OFFSET=
_BITS=3Dxxx a00.c
and then later
guix build -s i686-linux json-c
on it.
a00.c:
#include <stdio.h>
#include <errno.h>
#include <assert.h>
#include <dirent.h>
#if defined( __ILP32__ )
#warning ILP32
#endif
int main() {
DIR* d;
struct dirent* ent;
d =3D opendir("tmp");
errno =3D 0;
assert(sizeof(ent->d_off) =3D=3D sizeof(off_t));
while ((ent =3D readdir(d)) !=3D NULL) {
printf("off=3D%llX, ino=3D%llX\n", (unsigned long long) ent=
->d_off, (unsigned long long) ent->d_ino);
}
if (errno)
perror("readdir");
return sizeof(off_t);
}
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Hello Danny,
On Sat, Sep 26, 2020 at 12:53:20PM +0200, Danny Milosavljevic wrote:
> Could we enable qemu-binfmt for i686 on an aarch64 host for me to test it?
I am working (or rather, the machine is compiling) to set it up on dover.
When it is finished, I will keep you updated (it may take a while, since
I did a "guix pull", and now it will also compile a new kernel).
Andreas
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Hello Danny,
On Sat, Sep 26, 2020 at 12:53:20PM +0200, Danny Milosavljevic wrote:
> I'd like to test what happens if one builds json-c on an aarch64 host
> for i686.
> Could we enable qemu-binfmt for i686 on an aarch64 host for me to test it?
> One machine is enough--I'd just run
> guix environment -s i686-linux gcc-toolchain -- gcc -o a00 -D_FILE_OFFSET_BITS=xxx a00.c
> and then later
> guix build -s i686-linux json-c
you can give it a try on dover.guix.info, but you should be ready for
a wait: As other build machines, it does not use substitutes, so everything
will be built locally using qemu-binfmt. Maybe you could import what
is needed for the "guix environment" from an i686 machine?
I would suggest to do a "guix pull --commit=0939462e3f81bc98b38bdb7610e6a80ca1cbaa1b",
since this is the version already available on the machine.
Andreas
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Hmm, /home/dannym is missing there. I can log in but not pull.
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Subject: bug#43513: json-c build failure (on armhf-linux) while trying to build u-boot
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Hi,
Danny Milosavljevic <dannym@HIDDEN> skribis:
> I'd like to test what happens if one builds json-c on an aarch64 host
> for i686.
>
> Could we enable qemu-binfmt for i686 on an aarch64 host for me to test it?
I think you can just run =E2=80=98qemu-i386 /path/to/your/program=E2=80=99;=
no need for
the whole binfmt_misc shebang.
HTH,
Ludo=E2=80=99.
X-Loop: help-debbugs@HIDDEN
Subject: bug#43513: json-c build failure (on armhf-linux) while trying to build u-boot
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Hi Ludo,
On Tue, 29 Sep 2020 12:25:54 +0200
Ludovic Court=C3=A8s <ludo@HIDDEN> wrote:
> > I'd like to test what happens if one builds json-c on an aarch64 host
> > for i686.
> >
> > Could we enable qemu-binfmt for i686 on an aarch64 host for me to test =
it? =20
>=20
> I think you can just run =E2=80=98qemu-i386 /path/to/your/program=E2=80=
=99; no need for
> the whole binfmt_misc shebang.
Sure, but I want to know what happens to json-c. That sounds like a lot of
manual invocations (like about 20000--for invocations of "configure", "gcc",
including all the dependencies etcetc).
Andreas Enge already tried to configure dover.guix.info to uses qemu-binfmt
to emulate i686-linux, but apparently it doesn't work (on dover.guix.info):
building /gnu/store/7wz8nqh6nkfqz6l780i6i34c6wa6ic6q-guile-bootstrap-2.0.dr=
v...
\builder for `/gnu/store/7wz8nqh6nkfqz6l780i6i34c6wa6ic6q-guile-bootstrap-2=
.0.drv' failed with exit code 1
build of /gnu/store/7wz8nqh6nkfqz6l780i6i34c6wa6ic6q-guile-bootstrap-2.0.dr=
v failed
View build log at '/var/log/guix/drvs/7w/z8nqh6nkfqz6l780i6i34c6wa6ic6q-gui=
le-bootstrap-2.0.drv.bz2'.
bash-5.0$ bzless /var/log/guix/drvs/7w/z8nqh6nkfqz6l780i6i34c6wa6ic6q-guile=
-bootstrap-2.0.drv.bz2
------> /var/log/guix/drvs/7w/z8nqh6nkfqz6l780i6i34c6wa6ic6q-guile-bootstra=
p-2.0.drv.bz2 <------
while setting up the build environment: executing `/gnu/store/mzfkrxd4w8vqr=
myrx169wj8wyw7r8i37-bash': No such file or directory
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On Tue, 29 Sep 2020 12:43:08 +0200
Danny Milosavljevic <dannym@HIDDEN> wrote:
> /gnu/store/mzfkrxd4w8vqrmyrx169wj8wyw7r8i37-bash
Also, this file exists, and is for i686, and if I invoke it using
/gnu/store/mzfkrxd4w8vqrmyrx169wj8wyw7r8i37-bash -c "echo foo"
then it works (which means the qemu transparent emulation picks it us).
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Subject: bug#43513: json-c build failure (on armhf-linux) while trying to build u-boot
Resent-From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
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Hi,
Danny Milosavljevic <dannym@HIDDEN> skribis:
> On Tue, 29 Sep 2020 12:25:54 +0200
> Ludovic Court=C3=A8s <ludo@HIDDEN> wrote:
>
>> > I'd like to test what happens if one builds json-c on an aarch64 host
>> > for i686.
>> >
>> > Could we enable qemu-binfmt for i686 on an aarch64 host for me to test=
it?=20=20
>>=20
>> I think you can just run =E2=80=98qemu-i386 /path/to/your/program=E2=80=
=99; no need for
>> the whole binfmt_misc shebang.
>
> Sure, but I want to know what happens to json-c. That sounds like a lot =
of
> manual invocations (like about 20000--for invocations of "configure", "gc=
c",
> including all the dependencies etcetc).
Do we know which bit of json-c=E2=80=99s =E2=80=98configure=E2=80=99 draws =
an incorrect
conclusion?
> Andreas Enge already tried to configure dover.guix.info to uses qemu-binf=
mt
> to emulate i686-linux, but apparently it doesn't work (on dover.guix.info=
):
>
> building /gnu/store/7wz8nqh6nkfqz6l780i6i34c6wa6ic6q-guile-bootstrap-2.0.=
drv...
> \builder for `/gnu/store/7wz8nqh6nkfqz6l780i6i34c6wa6ic6q-guile-bootstrap=
-2.0.drv' failed with exit code 1
> build of /gnu/store/7wz8nqh6nkfqz6l780i6i34c6wa6ic6q-guile-bootstrap-2.0.=
drv failed
> View build log at '/var/log/guix/drvs/7w/z8nqh6nkfqz6l780i6i34c6wa6ic6q-g=
uile-bootstrap-2.0.drv.bz2'.
>
> bash-5.0$ bzless /var/log/guix/drvs/7w/z8nqh6nkfqz6l780i6i34c6wa6ic6q-gui=
le-bootstrap-2.0.drv.bz2
> ------> /var/log/guix/drvs/7w/z8nqh6nkfqz6l780i6i34c6wa6ic6q-guile-bootst=
rap-2.0.drv.bz2 <------
> while setting up the build environment: executing `/gnu/store/mzfkrxd4w8v=
qrmyrx169wj8wyw7r8i37-bash': No such file or directory
That=E2=80=99s to little context for me to say much (I=E2=80=99d need to se=
e the command
at least) but it could be that it=E2=80=99s trying to run i686 code on ARM =
or
similar.
Ludo=E2=80=99.
X-Loop: help-debbugs@HIDDEN
Subject: bug#43513: json-c build failure (on armhf-linux) while trying to build u-boot
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Date: Wed, 30 Sep 2020 13:27:54 +0200
From: Danny Milosavljevic <dannym@HIDDEN>
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Hi Ludo,
On Wed, 30 Sep 2020 11:10:17 +0200
Ludovic Court=C3=A8s <ludo@HIDDEN> wrote:
> Danny Milosavljevic <dannym@HIDDEN> skribis:
>=20
> > On Tue, 29 Sep 2020 12:25:54 +0200
> > Ludovic Court=C3=A8s <ludo@HIDDEN> wrote:
> > Sure, but I want to know what happens to json-c. That sounds like a lo=
t of
> > manual invocations (like about 20000--for invocations of "configure", "=
gcc",
> > including all the dependencies etcetc). =20
>=20
> Do we know which bit of json-c=E2=80=99s =E2=80=98configure=E2=80=99 draw=
s an incorrect
> conclusion?
At least I don't. I don't even have a homedir on dover.guix.info, so I can=
not
run guix pull, guix describe, or really anything that is interesting on the=
re.
Andreas knows maybe--it works for him.
> > while setting up the build environment: executing `/gnu/store/mzfkrxd4w=
8vqrmyrx169wj8wyw7r8i37-bash': No such file or directory =20
>=20
> That=E2=80=99s to little context for me to say much (I=E2=80=99d need to =
see the command
> at least) but it could be that it=E2=80=99s trying to run i686 code on AR=
M or
> similar.
Note that /gnu/store/mzfkrxd4w8vqrmyrx169wj8wyw7r8i37-bash is an i686 execu=
table
on dover.
Running it just like this
/gnu/store/mzfkrxd4w8vqrmyrx169wj8wyw7r8i37-bash
it works there on dover!
In order to reproduce the problem, you can log into dover.guix.info and then
run
guix build -s i686-linux json-c
.
Andreas knows more and can do much more on that machine.
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