Re: [Ccrtp-devel] Deadlock

[Michel de Boer]

Thanks for your response. I don't know what glibc version this user has.
I have asked. But I doubt it is an old version as I believe he is
running NPTL instead of LinuxThreads.

The thread that actually hangs in the pthread_join() is not the
thread that was handling the RTP packets. The hanging thread
destroyed the SingleThreadRTPSession object thereby killing the
RTP thread. From the backtraces I have received it seems that
the RTP thread has exited (maybe even before the RTPSession object
is killed; I can't tell. So I would expect pthread_join()
to return immediately. I will see what more information I get
to solve this problem.


David Sugar wrote:
> Which version of glibc was the target platform under?  I have seen very
> odd problems like that in rather old glibc's, perhaps around the time of
> Debian woody, with the older linuxthreads stuff, when a thread
> terminates itself by exiting, and something later then tries to join
> with it.
>
> Michel de Boer wrote:
>
>
> > Hi,
> >
> > I hope this mailing list is still alive. It has been very quiet here
> > recently.
> >
> > A user of my SIP softphone Twinkle reported a deadlock situation to me.
> > The function backtrace showed the following:
> >
> > #0  0x0000003f88f07105 in pthread_join () from /lib/libpthread.so.0
> > #1  0x00002aaaab008b48 in ost::Thread::terminate ()
> >   from /usr/lib/libccgnu2-1.3.so.1
> > #2  0x0000000000575f70 in ~SingleThreadRTPSession (this=0xb5e420,
> >    __vtt_parm=0x5c9b48) at rtp.h:456
> > #3  0x000000000057686e in ~t_twinkle_rtp_session (this=0xb5e420)
> >    at twinkle_rtp_session.h:10
> >
> > Somehow it seems that the RTP session thread gets stuck in
> > pthread_join() forever.
> >
> > Has someone else experience this problem? Or does somebody knows
> > how to solve it?
> >
> > The problem is that I cannot reproduce this problem on my own
> > machine, so it is a bit hard to debug :-(
> >
> > Best regards,
> > Michel
> >
> >
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