Re: MySQL segmentation faults...

am 18.09.2003 14:35:41 von Dave Howorth

On the mysqlcc list Adam Hooper just wrote:
> In general, running "strace " will give some useful output;
> it'll give developers a good idea of where the problem is. Beyond that,
> a backtrace is useful. To produce one:
>
> 1. Run gdb (gdb is available for EVERY distribution)
> 2. Type 'run'
> 3. Get a segfault. The window won't close, and gdb will pop up a warning
> of sorts.
> 4. Type 'bt' and email the output here :).

This seems like it might be relevant to diagnosing my
DBD::mysql::db::_login crash, so in the hope it may help ...

The strace output is:

open("/var/lib/mysql/my.cnf", O_RDONLY|O_LARGEFILE) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=48, ...}) = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
-1, 0) = 0x4001a000
read(3, "# This file must exist - CAN-200"..., 4096) = 48
read(3, "", 4096) = 0
close(3) = 0
munmap(0x4001a000, 4096) = 0
open("/home/dhoworth/.my.cnf", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No
such file or directory)
--- SIGSEGV (Segmentation fault) ---
+++ killed by SIGSEGV +++

The gdb output is:

Program received signal SIGSEGV, Segmentation fault.
0x401cc030 in strcend () from /usr/lib/libmysqlclient.so.10
(gdb) bt
#0 0x401cc030 in strcend () from /usr/lib/libmysqlclient.so.10
#1 0x401bd922 in simple_command () from /usr/lib/libmysqlclient.so.10
#2 0x401be31d in mysql_real_connect () from /usr/lib/libmysqlclient.so.10
#3 0x4019ebd4 in mysql_dr_connect ()
from /usr/lib/perl5/auto/DBD/mysql/mysql.so
#4 0x4019ef40 in mysql_dr_connect ()
from /usr/lib/perl5/auto/DBD/mysql/mysql.so
#5 0x4019efb3 in mysql_db_login () from
/usr/lib/perl5/auto/DBD/mysql/mysql.so
#6 0x401a3114 in XS_DBD__mysql__db__login ()
from /usr/lib/perl5/auto/DBD/mysql/mysql.so
#7 0x0809c70c in Perl_pp_entersub ()
#8 0x08097090 in Perl_runops_standard ()
#9 0x0805cdca in perl_call_sv ()
#10 0x0805c981 in perl_call_sv ()
#11 0x401910d1 in XS_DBI_dispatch () from /usr/lib/perl5/auto/DBI/DBI.so
#12 0x0809c70c in Perl_pp_entersub ()
#13 0x08097090 in Perl_runops_standard ()
#14 0x0805c565 in perl_run ()
#15 0x0805c2cb in perl_run ()
#16 0x08059ca0 in main ()
#17 0x4005b0bf in __libc_start_main () from /lib/libc.so.6

HTH, Dave

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Re: MySQL segmentation faults...

am 18.09.2003 20:59:57 von Jochen Wiedmann

Excellent stack trace, post this to the MySQL mailing list. It is a bug in
the C driver.

Jochen

Dave Howorth wrote:

> On the mysqlcc list Adam Hooper just wrote:
>
>> In general, running "strace " will give some useful output;
>> it'll give developers a good idea of where the problem is. Beyond
>> that, a backtrace is useful. To produce one:
>>
>> 1. Run gdb (gdb is available for EVERY distribution)
>> 2. Type 'run'
>> 3. Get a segfault. The window won't close, and gdb will pop up a
>> warning of sorts.
>> 4. Type 'bt' and email the output here :).
>
>
> This seems like it might be relevant to diagnosing my
> DBD::mysql::db::_login crash, so in the hope it may help ...
>
> The strace output is:
>
> open("/var/lib/mysql/my.cnf", O_RDONLY|O_LARGEFILE) = 3
> fstat64(3, {st_mode=S_IFREG|0644, st_size=48, ...}) = 0
> old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
> -1, 0) = 0x4001a000
> read(3, "# This file must exist - CAN-200"..., 4096) = 48
> read(3, "", 4096) = 0
> close(3) = 0
> munmap(0x4001a000, 4096) = 0
> open("/home/dhoworth/.my.cnf", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No
> such file or directory)
> --- SIGSEGV (Segmentation fault) ---
> +++ killed by SIGSEGV +++
>
> The gdb output is:
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x401cc030 in strcend () from /usr/lib/libmysqlclient.so.10
> (gdb) bt
> #0 0x401cc030 in strcend () from /usr/lib/libmysqlclient.so.10
> #1 0x401bd922 in simple_command () from /usr/lib/libmysqlclient.so.10
> #2 0x401be31d in mysql_real_connect () from /usr/lib/libmysqlclient.so.10
> #3 0x4019ebd4 in mysql_dr_connect ()
> from /usr/lib/perl5/auto/DBD/mysql/mysql.so
> #4 0x4019ef40 in mysql_dr_connect ()
> from /usr/lib/perl5/auto/DBD/mysql/mysql.so
> #5 0x4019efb3 in mysql_db_login () from
> /usr/lib/perl5/auto/DBD/mysql/mysql.so
> #6 0x401a3114 in XS_DBD__mysql__db__login ()
> from /usr/lib/perl5/auto/DBD/mysql/mysql.so
> #7 0x0809c70c in Perl_pp_entersub ()
> #8 0x08097090 in Perl_runops_standard ()
> #9 0x0805cdca in perl_call_sv ()
> #10 0x0805c981 in perl_call_sv ()
> #11 0x401910d1 in XS_DBI_dispatch () from /usr/lib/perl5/auto/DBI/DBI.so
> #12 0x0809c70c in Perl_pp_entersub ()
> #13 0x08097090 in Perl_runops_standard ()
> #14 0x0805c565 in perl_run ()
> #15 0x0805c2cb in perl_run ()
> #16 0x08059ca0 in main ()
> #17 0x4005b0bf in __libc_start_main () from /lib/libc.so.6
>
> HTH, Dave
>
>

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Re: MySQL segmentation faults...

am 18.09.2003 20:59:57 von Jochen Wiedmann