[Pgpool-general] FW: Child process was terminated by segmentation fault

[Tatsuo Ishii]

Silvio,

Thank you for sending cores. I got backtrace this:

gdb .libs/pgpool ~/core-pgpool-11-0-0-20473-1321347122 
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This GDB was configured as "x86_64-vine-linux".
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<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/t-ishii/work/pgfoundry/pgpool-II-3.1/.libs/pgpool...done.

warning: exec file is newer than core file.
[New Thread 20473]
Reading symbols from /lib64/ld-linux-x86-64.so.2...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2

warning: no loadable sections found in added symbol-file system-supplied DSO at 0x7fff50f70000
Core was generated by `pgpool: vcms'.
Program terminated with signal 11, Segmentation fault.
#0  0x00000000004626ef in core_yylex_init (ptr_yy_globals=0x100) at scan.c:3444
3444	    memset(*ptr_yy_globals,0x00,sizeof(struct yyguts_t));
(gdb) bt
#0  0x00000000004626ef in core_yylex_init (ptr_yy_globals=0x100) at scan.c:3444
#1  0x00000000000000b2 in ?? ()
#2  0x0000000000000050 in ?? ()
#3  0x000000001c1978b0 in ?? ()
#4  0x0000000000000000 in ?? ()
(gdb) 

It seems the backtrace does not show too much usefull info. I think
this is because the stack frame was trashed badly by a overrun of
memory copy. I'm looking into the problem anyway but it would be great
if you or someone provide me more usefull info...
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese: http://www.sraoss.co.jp

> Thanks for your quick response. Dump/trace files are enclosed - I hope they contain the information you need - if not please let me know what else could help you.
> Regards,
> 
> silvio
> 
> 
> 
> 
> -----Original Message-----
> From: Tatsuo Ishii [mailto:ishii at sraoss.co.jp] 
> Sent: 14. studeni 2011 16:05
> To: Silvio Svečnjak
> Cc: pgpool-general at pgfoundry.org
> Subject: Re: [Pgpool-general] FW: Child process was terminated by segmentation fault
> 
>> We're using pgpool 3.1 with PostgreSQL 8.4.7 on RHEL 5.3 x64 where pgpool is configured for replication only on 2 backends. Pgpool is used by a real time java application which occasionally (without any visible pattern) catches an exception (org.postgresql.util.PSQLException: An I/O error occured while sending to the backend). 
>> 
>>  
>> 
>> We've determined that the exception is caused by pgpool as at the same time pgpool records the following error: 
>> 
>>  
>> 
>> 2011-11-14 14:14:45 ERROR: pid 10783: Child process 10812 was terminated by segmentation fault
>> 
>> 2011-11-14 14:14:45 DEBUG: pid 10783: child 10812 exits with status 11 by signal 11
>> 
>>  
>> 
>> Bigger chunk of  log file is enclosed as well as the pgpool configuration file.
>> 
>>  
>> 
>> After some research on the mailing lists, I found that some patches have been released for version 3.1 which may resolve the issue. So I downloaded and deployed the latest stable release pgpool2-V3_1_STABLE-8b47d55, but it didn't solve the problem. 
>> 
>>  
>> 
>> I would appreciate very much if someone could provide any help with this? Thank you in advance,
> 
> Can you take a core and show us the backtrace? It will be very helpfull.
> --
> Tatsuo Ishii
> SRA OSS, Inc. Japan
> English: http://www.sraoss.co.jp/index_en.php
> Japanese: http://www.sraoss.co.jp