[Csync2] Format error while receiving data after segfault

[Vincent Régnard]

Lars Ellenberg a écrit :
> On Tue, Dec 09, 2008 at 10:42:36AM +0100, Vincent Régnard wrote:
>> Hi all,
>>
>> With a large setup, resyncing from scratch after a -TIUX and doing a  
>> full synchronisation afterward, csync2 process hangs up and crashes  
>> sometimes client side, sometimes server side dumping a core. This setup  
>> was running fine before for smaller updates executed on a regular basis.
>>
>> postmortem analysing core file with gdb says:
>>
>> Core was generated by `/usr/sbin/csync2 -ii -vvv'.
>> Program terminated with signal 11, Segmentation fault
>>
>> With the exact same configuration a few weeks ago I ran this  
>> synchronisation (10 hours run) but this ended normally, before putting  
>> the servers in production environement.
>>
>> I can imagine this is a memory related problem, I thing the systems is  
>> starting swapping at some point or something like this.
>>
>> How can I help debuging this problem ?
> 
> if you have the core file already,
> ask for a backtrace: bt
> 
> if that does not look promissing, because of missing debug symbols,
> rebuild csync2 with debug symbols enabled (add -g to the CFLAGS).
> then reproduce, and capture the backtrace.
> 

I did that, and ran the freshly built byte sequence again, but problem 
no more occur (probably incantations worked) !! But I realized the 
memory was increasing a lot allong the synchronisation process (up to 
250MB for a single csync process), this looks abnormal.

Initial backtrace I have is useless (no symbols), I have the new binary 
with debug symbols in the production environement now, I'll try to make 
it segfault again and post the frame trace here.

-- 
Vincent Régnard
vregnard at tbs-internet.com
TBS-internet.com
027 630 5902

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