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BUG #4941: pg_stat_statements crash

From: "" <alr(dot)nospamforme(at)gmail(dot)com>
To: pgsql-bugs(at)postgresql(dot)org
Subject: BUG #4941: pg_stat_statements crash
Date: 2009-07-24 13:14:40
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Lists: pgsql-bugspgsql-hackers
The following bug has been logged online:

Bug reference:      4941
Logged by:          
Email address:      alr(dot)nospamforme(at)gmail(dot)com
PostgreSQL version: 8.4.0
Operating system:   windows 2008,2003
Description:        pg_stat_statements 	crash

i was testing for issues with reattach memory patch fix 
I believe that  in windows 2008 , and 2003 shared_preload_libraries =
'pg_stat_statements'  can crash postgres 

2009-07-23 17:48:22 EDT 3820   LOG:  server process (PID 4608) was
terminated by exception 0xC0000005
2009-07-23 17:48:22 EDT 3820   HINT:  See C include file "ntstatus.h" for a
description of the hexadecimal value.
2009-07-23 17:48:22 EDT 3820   LOG:  terminating any other active server
so far  have been able to reproduce  this by running  pgbench on mutable
systems. ( two non  production and 2 clean installs on MS virtual Server )
machines have 3+ gig ram 
shared_buffers = 94MB
max_connections = 300

pgbench.exe -i -s 300 pgbench 
and running over and over  
pgbench -c 100 -C from windows xp client
please not it may not crash on the first or second run but when it crashes
the first time 
it will then crash every time after that even with reboots.   it may be that
the  'pg_stat_statements'  log somehow gets corrupted? 
i am unable to reproduce if  -C is not used ? 
i have also noticed that normally task manager  splits the load between a
lot of postgres processes but when it is turned on 1 postgres process uses
50% load.  
I have tested both the postgres and 8.4.9177 postgress.exe  and
both seem to have same issue .
hope this info  helps 


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