[mythtv-users] mythtv hard lockup

David Rees drees76 at gmail.com
Fri Dec 22 03:09:31 UTC 2006

On 12/20/06, Yeechang Lee <ylee at pobox.com> wrote:
> David Rees <drees76 at gmail.com> says:
> > I'm upgrading the machine to FC6 now, I see that it likely won't
> > help, but thanks for the hint.
> As noted, upgrading did help me quite a bit on a relative basis.

How do did it help?

> Another clue: Tonight the hang occurred again on my
> frontend/backend. However, I decided to
> a) Wait a bit after emergency syncing with the magic SysRq key before
> emergency read-only remounting and rebooting, and b) watch
> /var/log/messages (from a superuser session I opened up ahead of time,
> since no local-disk writes = no sudoing after the fact). Here's what I
> saw:
> Dec 20 21:08:14 bijou kernel: SysRq : Emergency Sync
> Dec 20 21:08:16 bijou kernel: SysRq : Emergency Sync
> Dec 20 21:08:55 bijou last message repeated 4 times
> Dec 20 21:08:58 bijou kernel: Emergency Sync complete
> Dec 20 21:09:34 bijou kernel: Emergency Sync complete
> 44 seconds before the first emergency sync is complete and 78 seconds
> before the second? And, yes, the system did come back to life; heck,
> through the whole time mythbackend kept recording away (to a local
> RAID array that isn't the boot drive) with no gaps in the
> recording. This experience has taught me that it's possible emergency
> syncing really might be able to bring back the system more often than
> in my experience so far if I am just a little bit more patient. Now,
> if I could just figure out what the cause is in the first place.

Interesting, I'll have to keep a console logged on so I can try the
same. Out of curiosity, what filesystem are you running on your root
partition? My system is using jfs...


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