retry, post never made it to the list Begin forwarded message: > From: Klaus Kuehnhammer <klaus@xxxxxxxxxxx> > Date: 15. Februar 2010 18:20:48 MEZ > To: pjsip list <pjsip at lists.pjsip.org> > Cc: Andreas Barta <a.barta at centersystems.com>, Andreas Wehrmann <a.wehrmann at centersystems.com> > Subject: bug report: pjsip/pjsua deadlock > > Hi! > > We've been observing occasional deadlocks in pjsua. They seem to be triggered when a call is made, and then almost immediately ended at about the same time the 200 reply from the called UA is just being processed. > > Analysis of pjsua (vanilla PC build, version 1.5.5) with helgrind points to a number of incoherent lock acquisition orders for the pjsua, dialog and transaction mutexes. > > * call_make_call locks the pjsua mutex first, then the transaction mutex, and finally the dialog > * incoming sip messages lock the transaction first, and then the pjsua mutex in the pjsua_call_on_tsx_state_changed callback > > * pjsua_call_hangup locks the dialog, then the transaction > * incoming and timer-triggered messages lock the transaction, then the dialog > > There are more errors logged by helgrind (file is attached), but these seem to me the possible culprits in the deadlock case we've seen. > > The way mutexes are used in the dialogs and transactions is not immediately intuitive (to me at least), so I can't really offer a quick fix for this. > > It's definitely a real problem though, so we thought we'd let people know... if anyone has an idea how to best go about resolving this, please let us know! > > Best regards, > Klaus > > > -- > Klaus Kuehnhammer > Bitstem Software > Wasnergasse 11/5 > 1200 Wien, Austria > +43 664 2133466 > klaus at bitstem.com > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20100216/e87206cc/attachment-0002.html> -------------- next part -------------- A non-text attachment was scrubbed... Name: hg.log Type: application/octet-stream Size: 237805 bytes Desc: not available URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20100216/e87206cc/attachment-0001.log> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20100216/e87206cc/attachment-0003.html>
