[php-maint] Bug#513204: Bug#513204: Bug#513204: php5-mysql: doesn't crash anymore if I use taskset to launch my php script

[Raphael Geissert]

2009/1/27 sean finney <seanius at debian.org>:
[...]
> the backtrace is equally odd:
>
> #0  0x00007f4f4d05fed0 in ?? ()
> #1  0x00007f4f4da25fc7 in start_thread () from /lib/libpthread.so.0
> #2  0x00007f4f4e0a55ad in clone () from /lib/libc.so.6
> #3  0x0000000000000000 in ?? ()
>


$ gdb -c core.12186 /usr/bin/php5
Program terminated with signal 11, Segmentation fault.
[New process 12202]
[New process 12186]
#0  0xb7391e90 in ?? ()
(gdb) bt
#0  0xb7391e90 in ?? ()
#1  0xb77944c0 in start_thread () from /lib/i686/cmov/libpthread.so.0
#2  0xb79db6de in clone () from /lib/i686/cmov/libc.so.6

$ gdb -c core.12025 /usr/bin/php5
Program terminated with signal 11, Segmentation fault.
[New process 12026]
[New process 12025]
#0  0xb6bb03cf in ?? () from /lib/libgcc_s.so.1
(gdb) bt
#0  0xb6bb03cf in ?? () from /lib/libgcc_s.so.1
#1  0xb6bb0c63 in ?? () from /lib/libgcc_s.so.1
#2  0xb6bb0d8b in _Unwind_ForcedUnwind () from /lib/libgcc_s.so.1
#3  0xb784bee6 in _Unwind_ForcedUnwind () from /lib/i686/cmov/libpthread.so.0
#4  0xb7849901 in __pthread_unwind () from /lib/i686/cmov/libpthread.so.0
#5  0xb7843a20 in pthread_exit () from /lib/i686/cmov/libpthread.so.0
#6  0xb7a98b14 in pthread_exit () from /lib/i686/cmov/libc.so.6
#7  0xb7440eae in ?? ()
#8  0x00000000 in ?? ()

Attached is the strace, not surprisingly it died with a futex operation.
Attached is also the script I'm using to collect tha data.

libmysqlclient15off's dbg symbols don't help.

BUT, as weird as it may be, on another attempt both cores had exactly
the same backtrace (except for memory addresses). Strace of that other
attempt, which is actually different, attached as trace.by17014.gz.

Cheers,
-- 
Raphael Geissert - Debian Maintainer
www.debian.org - get.debian.net

Samuel Goldwyn  - "I had a monumental idea this morning, but I didn't like it."
-------------- next part --------------
A non-text attachment was scrubbed...
Name: trace.by9735.gz
Type: application/x-gzip
Size: 5191 bytes
Desc: not available
Url : http://lists.alioth.debian.org/pipermail/pkg-php-maint/attachments/20090203/9ea1b966/attachment-0002.bin 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: php-mysql_crasher.sh
Type: application/x-sh
Size: 307 bytes
Desc: not available
Url : http://lists.alioth.debian.org/pipermail/pkg-php-maint/attachments/20090203/9ea1b966/attachment-0001.sh 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: trace.by17014.gz
Type: application/x-gzip
Size: 5192 bytes
Desc: not available
Url : http://lists.alioth.debian.org/pipermail/pkg-php-maint/attachments/20090203/9ea1b966/attachment-0003.bin