[mythtv] Need help catching a segfault in mythbackend?

Matt Rude mythtv at mattrude.com
Tue May 22 16:08:34 UTC 2007

Mitko Haralanov wrote:
> Hi, due to some issues that I had with the stable release of myth
> (0.20.1), I am currently running the rpms from ATrpm's bleeding repo.
> Everything is working great, except that mythbackend is segfaulting
> from time to time.
> The segfaults happen under conditions that make it hard for me to catch
> so I am asking for some help on the subject. Here is the situation:
> I have my box setup to auto-shutdown and wake-up using nvram-wakeup.
> Usually, the box wakes up sometime in the afternoon and that is when
> the segfault happens. After it wakes up, the backend is running for a
> random amount of time (I say random because sometimes the backend works
> for an hour, sometimes four) and then it crashes with messages similar
> to this:
> May 19 19:19:19 mythtv kernel: mythfrontend[4318]: segfault at
> 0000000000676e6d rip 0000003b4f66eb92 rsp 000000004467a120 error 4
> The interesting part is that when I come home and find the backend
> gone, I restart it and then I continue to use the machine the entire
> night. I watch recordings (both HD and SD), I watch live tv (both HD
> and SD), and the backend records without a crash.
> Due to the fact that I am not at home when the machine wakes up and
> seem to crash, I don't have the chance to catch the crash. I have tried
> to set the core ulimit to "unlimited" in /etc/init.d/mythbackend, so it
> generates a core but it's not happening.
> I am looking for idea of how I can get a backtrace or a core (or both)
> that I can submit to the developers so, hopefully, the bug is fixed.
> Thanks in advance!
Try running running GDB and see what you get



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