Bugs item #2858286, was opened at 2009-09-13 21:58
Message generated for change (Comment added) made by fdupoux
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Category: crypto
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Francois Dupoux (fdupoux)
Assigned to: Nobody/Anonymous (nobody)
Summary: crash with libgcrypt
Initial Comment:
Hi,
I am using libssh2-1.2 to get a shell through ssh connections and the program
often crashes when libssh2-1.2 is using libgcrypt (there is a crash every few
hours). The program is linked to libgcrypt.so.11 when it fails. The error
message is always the same when it aborts:
programname: ath.c:193: _gcry_ath_mutex_lock: Assertion `*lock ==
((ath_mutex_t) 0)' failed.
I currently have this problem on a Debian Lenny-5.03-amd64 system. I have only
installed "debian/stable" packages on my system except those which are in
"debian/testing":
libgcrypt11 1.4.4-4
libgpg-error0 1.6-1
libssh2-1 1.2-1
libssh2-1-dbg 1.2-1
libssh2-1-dev 1.2-1
I recompiled libssh2-1.2 on other boxes using OpenSSL for crypto (using
libcrypto.so.6) and there was no crash. Unfortunately the debian version of
libssh2-1.2 is compiled against the libgcrypt implementation of crypto.
I have reproduced this problem on multiple linux boxes (i686 and x86-64).
I don't know if it's a problem in libssh2 or in libcrypto, but I hope these two
backtraces below will help to fix it. Unfortunately there is no libgcrypt11-dbg
package available for that version of libgcrypt, so the backtrace is incomplete.
Thanks
(gdb) bt
#0 0x00007faa5bae8ed5 in raise () from /lib/libc.so.6
#1 0x00007faa5baea3f3 in abort () from /lib/libc.so.6
#2 0x00007faa5bae1dc9 in __assert_fail () from /lib/libc.so.6
#3 0x00007faa5af67fcb in ?? () from /usr/lib/libgcrypt.so.11
#4 0x00007faa5af9c5d0 in ?? () from /usr/lib/libgcrypt.so.11
#5 0x00007faa5af9c71e in ?? () from /usr/lib/libgcrypt.so.11
#6 0x00007faa5af9d72d in ?? () from /usr/lib/libgcrypt.so.11
#7 0x00007faa5be26113 in _libssh2_transport_write (session=0x1c0cac0,
data=0x7faa540012a0 "^", data_len=69) at
transport.c:758
#8 0x00007faa5be0f48c in _libssh2_channel_write (channel=0x1bff560,
stream_id=0,
buf=0x421e0bf0 "echo \"#{START}#$(echo
'[*895346*]'
2>&1)#{RES}#${?}#{END}#\"\n", buflen=60) at
channel.c:2114
#9 0x00007faa5be0f721 in libssh2_channel_write_ex (channel=0x1bff560,
stream_id=0,
buf=0x421e0bf0 "echo \"#{START}#$(echo
'[*895346*]'
2>&1)#{RES}#${?}#{END}#\"\n", buflen=60) at
channel.c:2161
(gdb) bt
#0 0x00007faa5bae8ed5 in raise () from /lib/libc.so.6
#1 0x00007faa5baea3f3 in abort () from /lib/libc.so.6
#2 0x00007faa5bae1dc9 in __assert_fail () from /lib/libc.so.6
#3 0x00007faa5af67fcb in ?? () from /usr/lib/libgcrypt.so.11
#4 0x00007faa5af9c5d0 in ?? () from /usr/lib/libgcrypt.so.11
#5 0x00007faa5af9c71e in ?? () from /usr/lib/libgcrypt.so.11
#6 0x00007faa5af9d72d in ?? () from /usr/lib/libgcrypt.so.11
#7 0x00007faa5be26113 in _libssh2_transport_write (session=0x7faa54060fa0,
data=0x7faa54049e50 "^", data_len=69) at
transport.c:758
#8 0x00007faa5be0f48c in _libssh2_channel_write (channel=0x7faa54044c60,
stream_id=0,
buf=0x41b6fbf0 "echo \"#{START}#$(echo
'[*463794*]'
2>&1)#{RES}#${?}#{END}#\"\n", buflen=60) at
channel.c:2114
#9 0x00007faa5be0f721 in libssh2_channel_write_ex (channel=0x7faa54044c60,
stream_id=0,
buf=0x41b6fbf0 "echo \"#{START}#$(echo
'[*463794*]'
2>&1)#{RES}#${?}#{END}#\"\n", buflen=60) at
channel.c:2161
----------------------------------------------------------------------
>Comment By: Francois Dupoux (fdupoux)
Date: 2009-10-03 13:46
Message:
I think a mutex initialization for gcrypt is missing in
libssh2_crypto_init()
multi-thread software using gcrypt have to set the thread support
callbacks with the GCRYCTL_SET_THREAD_CBS command before any other function
in the library:
http://www.gnupg.org/documentation/manuals/gcrypt/Multi_002dThreading.html
There is a very simple example here:
http://www.gnu.org/software/gnutls/manual/html_node/Multi_002dthreaded-applications.html
Thanks
----------------------------------------------------------------------
Comment By: Francois Dupoux (fdupoux)
Date: 2009-09-14 18:35
Message:
Here is a more complete backtrace:
(gdb) bt
#0 0x00007f191239ced5 in raise () from /lib/libc.so.6
#1 0x00007f191239e3f3 in abort () from /lib/libc.so.6
#2 0x00007f1912395dc9 in __assert_fail () from /lib/libc.so.6
#3 0x00007f191181bfcb in _gcry_ath_mutex_lock (lock=0x7f1911a80510) at
ath.c:193
#4 0x00007f19118505d0 in lock_pool () at random-csprng.c:298
#5 0x00007f191185071e in initialize () at random-csprng.c:327
#6 0x00007f191185172d in _gcry_rngcsprng_randomize (buffer=0x6573,
length=25976, level=6) at random-csprng.c:514
#7 0x00007f19126da113 in _libssh2_transport_write
(session=0x7f190c008ca0, data=0x7f190c017b90 "^", data_len=69) at
transport.c:758
#8 0x00007f19126c348c in _libssh2_channel_write (channel=0x7f190c0065c0,
stream_id=0, buf=0x42b34c10 "echo \"#{START}#$(echo '[*121361*]'
2>&1)#{RES}#${?}#{END}#\"\n", buflen=60)
at channel.c:2114
#9 0x00007f19126c3721 in libssh2_channel_write_ex
(channel=0x7f190c0065c0, stream_id=0, buf=0x42b34c10 "echo
\"#{START}#$(echo '[*121361*]' 2>&1)#{RES}#${?}#{END}#\"\n", buflen=60)
at channel.c:2161
----------------------------------------------------------------------
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