GNU logs - #41264, boring messages

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Subject: bug#41264: Bootstrap packages fail to build.
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Date: Thu, 14 May 2020 17:17:47 +0200
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Hello,

This command fails on one of my systems:

--8<---------------cut here---------------start------------->8---
guix build  -e "(@@ (gnu packages commencement) glibc-mesboot0)"
--8<---------------cut here---------------end--------------->8---

with the following error:

--8<---------------cut here---------------start------------->8---
phase `unpack' succeeded after 11.8 seconds
starting phase `apply-boot-patch'
patch: **** fstatsterror: unknown error:  
command "patch" "--force" "-p1" "-i" "/gnu/store/pfz4y5i7krlvam2m8lpddmg9vi44rpqh-glibc-boot-2.2.5.patch" failed with status 2
note: keeping build directory `/tmp/guix-build-glibc-mesboot0-2.2.5.drv-1'
builder for `/gnu/store/jcqggqckhiq43y2ivlfhpkbfbp2vyjlc-glibc-mesboot0-2.2.5.drv' failed with exit code 1
build of /gnu/store/jcqggqckhiq43y2ivlfhpkbfbp2vyjlc-glibc-mesboot0-2.2.5.drv failed
View build log at '/var/log/guix/drvs/jc/qggqckhiq43y2ivlfhpkbfbp2vyjlc-glibc-mesboot0-2.2.5.drv.bz2'.
guix build: error: build of `/gnu/store/jcqggqckhiq43y2ivlfhpkbfbp2vyjlc-glibc-mesboot0-2.2.5.drv' failed
--8<---------------cut here---------------end--------------->8---

Here's a stracing of the failing "patch" command:

--8<---------------cut here---------------start------------->8---
open("/gnu/store/pfz4y5i7krlvam2m8lpddmg9vi44rpqh-glibc-boot-2.2.5.patch", O_RDONLY) = 3
brk(0x9377913)                          = 0x9377913
fstat(3, 0xffb29328)                    = -1 EOVERFLOW (Value too large for defined data type)
--8<---------------cut here---------------end--------------->8---

"patch-mesboot" is built for 32 bits. Hence, it can be using
"__ia32_sys_fstat", "__ia32_compat_sys_newfstat" or
"__ia32_compat_sys_x86_fstat64" syscall for "fstat". Here, according to
perf, it's using __ia32_compat_sys_newfstat which is overflowing on my
file system (inode count to high or so).

There's a little demonstration program attached. When built with `gcc
-m32 test.c', I have:

--8<---------------cut here---------------start------------->8---
fstat(3, 0xffad5874)                    = -1 EOVERFLOW (Value too large for defined data type)
fstat64(3, {st_mode=S_IFDIR|0555, st_size=4096, ...}) = 0
fstat64(3, {st_mode=S_IFDIR|0555, st_size=4096, ...}) = 0
--8<---------------cut here---------------end--------------->8---

So I think somehow, bootstrap packages use the legacy "fstat" syscall,
which may overflow on a 64 bits system.

WDYT,

Thanks,

Mathieu

--=-=-=
Content-Type: text/x-csrc
Content-Disposition: inline; filename=t.c

#define _GNU_SOURCE
#include <unistd.h>
#include <sys/syscall.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/sysmacros.h>

int
main(int argc, char *argv[])
{
    struct stat sb;

    if (argc != 2) {
        fprintf(stderr, "Usage: %s <pathname>\n", argv[0]);
        exit(EXIT_FAILURE);
    }

    int fd = open(argv[1], O_RDONLY);
    syscall(__NR_fstat, fd, &sb);
    syscall(__NR_fstat64, fd, &sb);
    fstat(fd, &sb);

    exit(EXIT_SUCCESS);
}

--=-=-=--

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To: Mathieu Othacehe <othacehe@HIDDEN>
Subject: bug#41264: Acknowledgement (Bootstrap packages fail to build.)
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Date: Thu, 14 May 2020 15:18:02 +0000

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Subject: bug#41264: Bootstrap packages fail to build.
Resent-From: Mathieu Othacehe <othacehe@HIDDEN>
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From: Mathieu Othacehe <othacehe@HIDDEN>
References: <87h7wik0kk.fsf@HIDDEN>
Date: Fri, 15 May 2020 14:11:34 +0200
In-Reply-To: <87h7wik0kk.fsf@HIDDEN> (Mathieu Othacehe's message of "Thu, 14
 May 2020 17:17:47 +0200")
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Hello,

> fstat(3, 0xffad5874)                    = -1 EOVERFLOW (Value too large for defined data type)
> fstat64(3, {st_mode=S_IFDIR|0555, st_size=4096, ...}) = 0
> fstat64(3, {st_mode=S_IFDIR|0555, st_size=4096, ...}) = 0
>
> So I think somehow, bootstrap packages use the legacy "fstat" syscall,
> which may overflow on a 64 bits system.

More info on that one. Linux syscall "newstat", will call
"cp_compat_stat". This function starts by checking the device id:

--8<---------------cut here---------------start------------->8---
	struct compat_stat tmp;

	if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
		return -EOVERFLOW;
--8<---------------cut here---------------end--------------->8---

Here, stat->dev is 66308 (major: 259, minor 4).

"old_valid_dev" checks that:

--8<---------------cut here---------------start------------->8---
static inline bool old_valid_dev(dev_t dev)
{
	return MAJOR(dev) < 256 && MINOR(dev) < 256;
}--8<---------------cut here---------------end--------------->8---

Which is false here, because my NVME disk has a BLOCK_EXT_MAJOR (259).

So stat, lstat, and all other related function will return -EOVERFLOW
unless their 64 bits stat64, lstat64 counterpart is used.

So I think this means that one cannot build the Guix bootstrap toolchain on an
NVME disk.

Thanks,

Mathieu

Message sent to bug-guix@HIDDEN:

Subject: bug#41264: Bootstrap packages fail to build.
Resent-From: Mathieu Othacehe <othacehe@HIDDEN>
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To: 41264 <at> debbugs.gnu.org
From: Mathieu Othacehe <othacehe@HIDDEN>
References: <87h7wik0kk.fsf@HIDDEN> <87v9kxe6tl.fsf@HIDDEN>
Date: Tue, 19 May 2020 10:52:28 +0200
In-Reply-To: <87v9kxe6tl.fsf@HIDDEN> (Mathieu Othacehe's message of "Fri, 15
 May 2020 14:11:34 +0200")
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Hello,

> So stat, lstat, and all other related function will return -EOVERFLOW
> unless their 64 bits stat64, lstat64 counterpart is used.
>
> So I think this means that one cannot build the Guix bootstrap toolchain on an
> NVME disk.

After further investigations I think that it is needed to patch GNU Mes
to fix this bug.

We would need to add three new syscalls for x86:

--8<---------------cut here---------------start------------->8---
#define SYS_stat64    0xc3
#define SYS_lstat64   0xc4
#define SYS_fstat64   0xc5
--8<---------------cut here---------------end--------------->8---

lib/linux/stat.c should be modified this way:

--8<---------------cut here---------------start------------->8---
#if __i386__
#define STAT_SYSCALL SYS_stat64
#else
#define STAT_SYSCALL SYS_stat
#endif

int
stat (char const *file_name, struct stat *statbuf)
{
  struct stat64 statbuf64;
  int ret;

  ret = _sys_call2 (STAT_SYSCALL, (long) file_name, (long) &statbuf64);

#if __i386__
  stat64_to_32(&statbuf64, statbuf);
#else
  *statbuf = statbuf64;
#endif

  return ret;
}
--8<---------------cut here---------------end--------------->8---

Then we would need to create stat64_to_32 which could be inspired from
__xstat64_conv from the glibc. Then, lstat and fstat64 would need to be
patched the same way.

This way, we would replicate the glibc behavior.

Thanks,

Mathieu

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Mathieu Othacehe writes:

Hello Mathieu,

>> So stat, lstat, and all other related function will return -EOVERFLOW
>> unless their 64 bits stat64, lstat64 counterpart is used.
>>
>> So I think this means that one cannot build the Guix bootstrap toolchain=
 on an
>> NVME disk.
>
> After further investigations I think that it is needed to patch GNU Mes
> to fix this bug.

Hmm, we need to patch Mes after all.  That's unfortunate.

> We would need to add three new syscalls for x86:
>
> #define SYS_stat64    0xc3
> #define SYS_lstat64   0xc4
> #define SYS_fstat64   0xc5
>
>
> lib/linux/stat.c should be modified this way:
>
> #if __i386__
> #define STAT_SYSCALL SYS_stat64
> #else
> #define STAT_SYSCALL SYS_stat
> #endif

Ah...the stat64 syscall is meant for i386; now it at starts making at
least some sense to me.

> int
> stat (char const *file_name, struct stat *statbuf)
> {
>   struct stat64 statbuf64;
>   int ret;
>
>   ret =3D _sys_call2 (STAT_SYSCALL, (long) file_name, (long) &statbuf64);
>
> #if __i386__
>   stat64_to_32(&statbuf64, statbuf);
> #else
>   *statbuf =3D statbuf64;
> #endif
>
>   return ret;
> }

That looks OK...

> Then we would need to create stat64_to_32 which could be inspired from
> __xstat64_conv from the glibc. Then, lstat and fstat64 would need to be
> patched the same way.
>
> This way, we would replicate the glibc behavior.

Beautiful, thanks for getting to the bottom of this.  Now that you
already have gone this far, would you like to whip-up a full patch for
GNU Mes?

To test it we may have to provide a tarball as we don't want to use XZ
and we don't have patch yet.  Or possibly we can download some
individual files ande overwrite them.

Greetings,
Janneke

--=20
Jan Nieuwenhuizen <janneke@HIDDEN> | GNU LilyPond http://lilypond.org
Freelance IT http://JoyofSource.com | Avatar=C2=AE http://AvatarAcademy.com

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merge 41264 49985
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retitle 41264 Bootstrap packages fail to build due to mes-libc lacking 'stat64' etc. syscalls
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Date: Wed, 01 Sep 2021 15:59:14 +0200
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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
Subject: control message for bug #41264
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severity 41264 important
quit

Last modified: Wed, 1 Sep 2021 14:15:02 UTC

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