2013/6/24 Paul J Stevens <p...@nfg.nl> > On 24-06-13 14:28, Ronald Moesbergen wrote: > > Hi, > > > > I'm seeing a reproducable crash in dbmail-lmtp, latest git, under very > > high load (20+ messages per second). The strange thing is the point of > > the crash is slightly different every time, but all due to "session" of > > one of it's member variables being freed while still in use. Looks like > > some kind of race condition or missing locking somewhere.. I have core > > dumps available if needed. The backtraces look as follows: > > Ronald, > > What is your scenario in terms of concurrency? >
There are 2 servers with around 20 LMTP client threads submitting messages in parallel to the dbmail-lmtp daemon. I didn't know dbmail-lmtp was single threaded, but that would explain a lot. > Lmtp is a single-threaded application so lack of locks is highly > unlikely. A race-condition is possible of course, but I suspect the > event-handlers are still active when they should have been disabled. > > You /could/ try > > > diff --git a/src/clientsession.c b/src/clientsession.c > index b59c8ee..f8b670b 100644 > --- a/src/clientsession.c > +++ b/src/clientsession.c > @@ -138,6 +138,8 @@ void client_session_bailout(ClientSession_T **session) > List_T messagelst = NULL; > > if (! c) return; > + ci_cork(c->ci); > + > TRACE(TRACE_DEBUG,"[%p]", c); > // brute force: > if (server_conf->no_daemonize == 1) _exit(0); > > > > which does just that: disable the event handlers before trying to clean > up a broken session. > > If that doesn't help, I would have to find a way to reproduce it. > > I'll try this and will let you know the results, it's pretty easy to reproduce here... Thanks! Ronald. > > > > -- > ________________________________________________________________ > Paul J Stevens pjstevns @ gmail, twitter, skype, linkedin > > * Premium Hosting Services and Web Application Consultancy * > > www.nfg.nl/i...@nfg.nl/+31.85.877.99.97 > ________________________________________________________________ > _______________________________________________ > Dbmail-dev mailing list > Dbmail-dev@dbmail.org > http://mailman.fastxs.nl/cgi-bin/mailman/listinfo/dbmail-dev >
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