Messages in this thread | | | Date | Thu, 11 Sep 2003 13:41:47 +0200 | From | Johannes Stezenbach <> | Subject | Re: [linux-dvb] Possible kernel thread related crashes on 2.4.x |
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Andrew de Quincey wrote: > Hi, I've been having fatal oopses with some of my DVB receiver systems > when restarting streaming recently (i.e. opening/closing DVB devices). > I've only just got into the office with a debug cable to find out what has happening. > > Anyway, here are the important parts of the oops (full oops at end of mail): > Unable to handle kernel paging request at virtual address d905a984 > ... > Trace; c011c79c <free_uid+2c/34> > Trace; c011767b <release_task+2b/16c> > Trace; c0118337 <sys_wait4+307/390> > Trace; c0106c03 <system_call+33/38> > > Does this look familiar to anyone? I mean specifically this thread on linux-dvb (among others): > http://www.linuxtv.org/mailinglists/linux-dvb/2003/04-2003/msg00291.html
I get this crash from time to time, and it was also reported on the linux-dvb list recently: http://www.linuxtv.org/mailinglists/linux-dvb/2003/08-2003/msg00361.html
But AFAIK there aren't many people who get this, and I didn't find any possible cause in the DVB drivers.
> Searching about found me this patch on LKML: > http://hypermail.idiosynkrasia.net/linux-kernel/archived/2003/week04/0468.html > > Which I applied to 2.4.21, and which appears to fix the problem. At least, > I was able to continually restart streaming for 4 hours this afternoon without a problem. > Previously, I could crash it within 15 minutes. > > It seems to be a bug related to kernel threads when starting/stopping them. The DVB drivers > now do this when a DVB device is opened/closed, although I'm sure they previously left > them running which would explain why I never saw this behaviour before.
Only the frontend driver core creates one thread per frontend for monitoring.
> My question is: is there a reason the patch has not yet made it into 2.4.x? It is not in > 2.4.22-pre3.
If this actually fixes kernel_thread() related crashes then please apply to -pre4.
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