[Freeswitch-users] Freeswitch Crashed by ODBC32.dll

[David Swardstrom]

More information on the problem with ODBC from Barrry:
Note: This is using a Postgresql driver, but there is a chance that
similar problematic code could be in other ODBC drivers.


> Here's a description of the issue we had.
> 
> Recently, while load testing the FreeSWITCH system we discovered a crash
> at an approximate load of 560 simultaneous calls.   This problem turned
> out to be difficult to find because the stack was being corrupted so we
> could not trace the crash reliably.
> 
> Eventually, we got lucky and trapped a crash with gdb active and a
> mildly corrupted stack.   The problem turned out to be an issue with a
> tcp/ip select() call.   The default fdset variable used by the select()
> call only allowed 1024 file descriptors to be used by the entire
> system.   Since FreeSWITCH uses two file descriptors (SIP) per call we
> exceeded that number quite quickly.   Technically, we were corrupting
> the stack at the 500 call level, but the stack wasn't getting corrupted
> 'enough' to crash until we approached 560 simultaneous calls.
> 
> The fdset variable/select() call that was causing the issue was in the
> Postgresql v8.4 0200 Driver code.   We contacted the Postgresql
> developers list and almost immediately received a patch from them.  The
> patch converted the select() call to a Linux poll call.  Problem
> solved.    We were able to test the system to 2500 simultaneous calls.
> 
> Barry Nicholson
> 
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