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From:Jochen Wiedmann Date:September 18 2003 6:59pm
Subject:Re: MySQL segmentation faults...
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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 <program>" 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 <program> (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
> 
> 


Thread
Re: MySQL segmentation faults...Dave Howorth18 Sep
  • Re: MySQL segmentation faults...Jochen Wiedmann18 Sep