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Subject: bug#38041: crypto with gnutls aka nettle (libhogweed) and scm_realloc
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I've got an app that links gnutls (for crypto code) which links nettle
(libhogweed) with is a GMP-using crypto library which seems like it wanted
to call plain-old realloc, and ended up calling scm_realloc instead. Note
that nettle does NOT use guile, so there's no plausible way that I know of
to end up in guile code. This only seems to happen when nettle is used
from multiple threads (so is maybe a nettle bug??) but the stack trace is
so bizarre, I thought I'd report it here.
It would seem that someone, somewhere, is doing some low-level thunking or
trampolining of realloc(). First, the crazy stack trace:
It's currently highly reproducible and exact:
(gdb) r
Starting program:
/home/linas/src/novamente/src/atomspace-dht/build/tests/persist/dht/MultiUserUTest
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Running cxxtest tests (2 tests)Start creating 6 user sessions
[2019-11-03 00:46:03:350] [DEBUG] BEGIN TEST: test_multiuser
Collecting from unknown thread
Thread 13 "MultiUserUTest" received signal SIGABRT, Aborted.
[Switching to Thread 0x7fffe0ff9700 (LWP 3844)]
__GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
50 ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1 0x00007ffff6834535 in __GI_abort () at abort.c:79
#2 0x00007ffff5c80ded in GC_push_all_stacks () at pthread_stop_world.c:585
#3 0x00007ffff5c777df in GC_mark_some (
cold_gc_frame=0x7fffe0ff59d0 "\274\327\354\365\377\177") at mark.c:322
#4 0x00007ffff5c6d15d in GC_stopped_mark (
stop_func=stop_func@entry=0x7ffff5c6cbf0 <GC_never_stop_func>)
at alloc.c:698
#5 0x00007ffff5c6dc69 in GC_try_to_collect_inner (
stop_func=0x7ffff5c6cbf0 <GC_never_stop_func>) at alloc.c:486
#6 0x00007ffff5c6deea in GC_try_to_collect_general (
stop_func=stop_func@entry=0x0, force_unmap=force_unmap@entry=0)
at alloc.c:1065
#7 0x00007ffff5c6dfbd in GC_gcollect () at alloc.c:1089
#8 0x00007ffff6df3e5e in scm_gc_register_allocation (size=size@entry=136)
at ../../libguile/gc.c:596
#9 0x00007ffff6df3554 in do_realloc (new_size=136, from=0x0)
at ../../libguile/gc-malloc.c:70
#10 scm_realloc (mem=0x0, size=136) at ../../libguile/gc-malloc.c:117
#11 0x00007ffff630431f in _nettle_gmp_alloc ()
from /usr/lib/x86_64-linux-gnu/libhogweed.so.4
#12 0x00007ffff62fc968 in nettle_mpz_random_size ()
from /usr/lib/x86_64-linux-gnu/libhogweed.so.4
#13 0x00007ffff62fc9f4 in nettle_mpz_random ()
from /usr/lib/x86_64-linux-gnu/libhogweed.so.4
#14 0x00007ffff62fcd63 in _nettle_generate_pocklington_prime ()
from /usr/lib/x86_64-linux-gnu/libhogweed.so.4
#15 0x00007ffff62fd2ce in nettle_random_prime ()
from /usr/lib/x86_64-linux-gnu/libhogweed.so.4
#16 0x00007ffff6300b53 in nettle_rsa_generate_keypair ()
from /usr/lib/x86_64-linux-gnu/libhogweed.so.4
#17 0x00007ffff7e0729e in ?? () from
/usr/lib/x86_64-linux-gnu/libgnutls.so.30
#18 0x00007ffff7da8f07 in gnutls_x509_privkey_generate2 ()
from /usr/lib/x86_64-linux-gnu/libgnutls.so.30
#19 0x00007ffff7f16990 in dht::crypto::PrivateKey::generate(unsigned int) ()
from
/home/linas/src/novamente/src/atomspace-dht/build/opencog/persist/dht/libpersist-dht.so
Next, verify that nettle does not use scm:
$ nm /usr/lib/x86_64-linux-gnu/libhogweed.a |grep scm
(nothing printed)
$ nm /usr/lib/x86_64-linux-gnu/libhogweed.a |grep GC
(nothing printed)
$ nm /usr/lib/x86_64-linux-gnu/libhogweed.a |grep alloc
U _nettle_gmp_alloc
U _nettle_gmp_alloc
U _nettle_gmp_alloc
U _nettle_gmp_alloc
U _nettle_gmp_alloc
U _nettle_gmp_alloc
U _nettle_gmp_alloc
U _nettle_gmp_alloc
U _nettle_gmp_alloc
U _nettle_gmp_alloc
U _nettle_gmp_alloc
U _nettle_gmp_alloc
U _nettle_gmp_alloc
00000000000005f0 T _nettle_gmp_alloc
00000000000004e0 T _nettle_gmp_alloc_limbs
U _nettle_gmp_alloc_limbs
U _nettle_gmp_alloc_limbs
U _nettle_gmp_alloc_limbs
U _nettle_gmp_alloc_limbs
U _nettle_gmp_alloc_limbs
U _nettle_gmp_alloc_limbs
U _nettle_gmp_alloc_limbs
U _nettle_gmp_alloc_limbs
U _nettle_gmp_alloc_limbs
Debugging suggestions?
--
cassette tapes - analog TV - film cameras - you
--00000000000074aee5059666dfcb
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr"><div>I've got an app that links gnutls (for crypto cod=
e) which links nettle (libhogweed) with is a GMP-using crypto library which=
seems like it wanted to call plain-old realloc, and ended up calling scm_r=
ealloc instead.=C2=A0 Note that nettle does NOT use guile, so there's n=
o plausible way that I know of to end up in guile code.=C2=A0 This only see=
ms to happen when nettle is used from multiple threads (so is maybe a nettl=
e bug??) but the stack trace is so bizarre, I thought I'd report it her=
e.</div><div><br></div><div>It would seem that someone, somewhere, is doing=
some low-level thunking or trampolining of realloc().=C2=A0 First, the cra=
zy stack trace:<br></div><div><br></div><div>It's currently highly repr=
oducible and exact:</div><div>(gdb) r<br>Starting program: /home/linas/src/=
novamente/src/atomspace-dht/build/tests/persist/dht/MultiUserUTest <br>[Thr=
ead debugging using libthread_db enabled]<br>Using host libthread_db librar=
y "/lib/x86_64-linux-gnu/libthread_db.so.1".<br>Running cxxtest t=
ests (2 tests)Start creating 6 user sessions<br>[2019-11-03 00:46:03:350] [=
DEBUG] BEGIN TEST: test_multiuser<br>Collecting from unknown thread<br><br>=
Thread 13 "MultiUserUTest" received signal SIGABRT, Aborted.<br>[=
Switching to Thread 0x7fffe0ff9700 (LWP 3844)]<br>__GI_raise (sig=3Dsig@ent=
ry=3D6) at ../sysdeps/unix/sysv/linux/raise.c:50<br>50 ../sysdeps/unix/sysv=
/linux/raise.c: No such file or directory.<br>(gdb) bt<br>#0 =C2=A0__GI_rai=
se (sig=3Dsig@entry=3D6) at ../sysdeps/unix/sysv/linux/raise.c:50<br>#1 =C2=
=A00x00007ffff6834535 in __GI_abort () at abort.c:79<br>#2 =C2=A00x00007fff=
f5c80ded in GC_push_all_stacks () at pthread_stop_world.c:585<br>#3 =C2=A00=
x00007ffff5c777df in GC_mark_some (<br>=C2=A0 =C2=A0 cold_gc_frame=3D0x7fff=
e0ff59d0 "\274\327\354\365\377\177") at mark.c:322<br>#4 =C2=A00x=
00007ffff5c6d15d in GC_stopped_mark (<br>=C2=A0 =C2=A0 stop_func=3Dstop_fun=
c@entry=3D0x7ffff5c6cbf0 <GC_never_stop_func>)<br>=C2=A0 =C2=A0 at al=
loc.c:698<br>#5 =C2=A00x00007ffff5c6dc69 in GC_try_to_collect_inner (<br>=
=C2=A0 =C2=A0 stop_func=3D0x7ffff5c6cbf0 <GC_never_stop_func>) at all=
oc.c:486<br>#6 =C2=A00x00007ffff5c6deea in GC_try_to_collect_general (<br>=
=C2=A0 =C2=A0 stop_func=3Dstop_func@entry=3D0x0, force_unmap=3Dforce_unmap@=
entry=3D0)<br>=C2=A0 =C2=A0 at alloc.c:1065<br>#7 =C2=A00x00007ffff5c6dfbd =
in GC_gcollect () at alloc.c:1089<br>#8 =C2=A00x00007ffff6df3e5e in scm_gc_=
register_allocation (size=3Dsize@entry=3D136)<br>=C2=A0 =C2=A0 at ../../lib=
guile/gc.c:596<br>#9 =C2=A00x00007ffff6df3554 in do_realloc (new_size=3D136=
, from=3D0x0)<br>=C2=A0 =C2=A0 at ../../libguile/gc-malloc.c:70<br>#10 scm_=
realloc (mem=3D0x0, size=3D136) at ../../libguile/gc-malloc.c:117<br>#11 0x=
00007ffff630431f in _nettle_gmp_alloc ()<br>=C2=A0 =C2=A0from /usr/lib/x86_=
64-linux-gnu/libhogweed.so.4<br>#12 0x00007ffff62fc968 in nettle_mpz_random=
_size ()<br>=C2=A0 =C2=A0from /usr/lib/x86_64-linux-gnu/libhogweed.so.4<br>=
#13 0x00007ffff62fc9f4 in nettle_mpz_random ()<br>=C2=A0 =C2=A0from /usr/li=
b/x86_64-linux-gnu/libhogweed.so.4<br>#14 0x00007ffff62fcd63 in _nettle_gen=
erate_pocklington_prime ()<br>=C2=A0 =C2=A0from /usr/lib/x86_64-linux-gnu/l=
ibhogweed.so.4<br>#15 0x00007ffff62fd2ce in nettle_random_prime ()<br>=C2=
=A0 =C2=A0from /usr/lib/x86_64-linux-gnu/libhogweed.so.4<br>#16 0x00007ffff=
6300b53 in nettle_rsa_generate_keypair ()<br>=C2=A0 =C2=A0from /usr/lib/x86=
_64-linux-gnu/libhogweed.so.4<br>#17 0x00007ffff7e0729e in ?? () from /usr/=
lib/x86_64-linux-gnu/libgnutls.so.30<br>#18 0x00007ffff7da8f07 in gnutls_x5=
09_privkey_generate2 ()<br>=C2=A0 =C2=A0from /usr/lib/x86_64-linux-gnu/libg=
nutls.so.30<br>#19 0x00007ffff7f16990 in dht::crypto::PrivateKey::generate(=
unsigned int) ()<br>=C2=A0 =C2=A0from /home/linas/src/novamente/src/atomspa=
ce-dht/build/opencog/persist/dht/libpersist-dht.so<br></div><div><br></div>=
<div>Next, verify that nettle does not use scm:</div><div><br></div><div>$ =
nm /usr/lib/x86_64-linux-gnu/libhogweed.a |grep scm<br></div><div>(nothing =
printed)</div><div>$ nm /usr/lib/x86_64-linux-gnu/libhogweed.a |grep GC</di=
v><div>(nothing printed)<br></div><div>$ nm /usr/lib/x86_64-linux-gnu/libho=
gweed.a |grep alloc<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0U _nettle_gmp_alloc<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0U _nettle_gmp_alloc<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0U _nettle_gmp_alloc<br>=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0U _nettle_gmp_alloc<br>=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0U _nettle_gmp_alloc<br>=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0U _nettle_gmp=
_alloc<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0U _=
nettle_gmp_alloc<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
=C2=A0U _nettle_gmp_alloc<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0U _nettle_gmp_alloc<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0U _nettle_gmp_alloc<br>=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0U _nettle_gmp_alloc<br>=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0U _nettle_gmp_alloc<br>=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0U _nettle_gmp_al=
loc<br>00000000000005f0 T _nettle_gmp_alloc<br>00000000000004e0 T _nettle_g=
mp_alloc_limbs<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0U _nettle_gmp_alloc_limbs<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0U _nettle_gmp_alloc_limbs<br>=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0U _nettle_gmp_alloc_limbs<br>=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0U _nettle_gmp_al=
loc_limbs<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
U _nettle_gmp_alloc_limbs<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0U _nettle_gmp_alloc_limbs<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0U _nettle_gmp_alloc_limbs<br>=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0U _nettle_gmp_alloc_lim=
bs<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0U _nett=
le_gmp_alloc_limbs</div><div><br></div><div>Debugging suggestions?<br></div=
><div>-- <br><div dir=3D"ltr" class=3D"gmail_signature" data-smartmail=3D"g=
mail_signature"><div dir=3D"ltr">cassette tapes - analog TV - film cameras =
- you<br></div></div></div></div>
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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: linasvepstas@HIDDEN Subject: bug#38041: Acknowledgement (crypto with gnutls aka nettle (libhogweed) and scm_realloc) Message-ID: <handler.38041.B.157274347324879.ack <at> debbugs.gnu.org> References: <CAHrUA37c4FYjh3=Hh7n_6Am3-eApKDXwB6JoU5opfySoHdp4Sw@HIDDEN> X-Gnu-PR-Message: ack 38041 X-Gnu-PR-Package: guile Reply-To: 38041 <at> debbugs.gnu.org Date: Sun, 03 Nov 2019 01:12:01 +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-guile@HIDDEN If you wish to submit further information on this problem, please send it to 38041 <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 38041: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D38041 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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Copyright (C) 1999 Darren O. Benham,
1997 nCipher Corporation Ltd,
1994-97 Ian Jackson.