Hi, I wrote to linux-dvb (2009-01-03 12:00 pm): > I've been coming up against a problem that seems to be with the DVB drivers > that occurs when a program using them, usually VDR in my case, terminates > uncleanly (segfault, general protection fault). Linux 2.6.25 doesn't have > this problem, but 2.6.26, 2.6.27, and 2.6.28 do, though 2.6.28 manifests > slightly differently to the others. I'll focus on what 2.6.28 does. I have > a DViCO FusionHDTV DVB-T Plus, running on an amd64 Debian Testing (mostly) > dual-core machine. > > After VDR crashes it attemps to restart itself. This was fine on 2.6.25, > but on later kernels the crash seems to leave the device in some unusable > state, where no program can subsequently use it - the device files > (/dev/dvb) no longer exist. (In 2.6.2[67], the files existed, but accessing > /dev/dvb/adapter0/dvr0 resulted in "No such device".) I had figured out > that in order to get the device working again it is necessary to "rmmod > cx88_dvb cx8802; modprobe cx88_dvb". This worked in 2.6.2[67] without > trouble, but in 2.6.28, it's as if the cx88_dvb module gets lost somehow. > It doesn't appear in lsmod, however: > phi:~# modprobe cx88_dvb > FATAL: Error inserting cx88_dvb > (/lib/modules/2.6.28/kernel/drivers/media/video/cx88/cx88-dvb.ko): No such > device > phi:~# rmmod cx88_dvb cx8802 > ERROR: Module cx88_dvb does not exist in /proc/modules > phi:~# modprobe cx88_dvb > > Note that probing it works only *after* cx8802 was unloaded. As before, now > the device is accessible. > > So it seems something is wrong in the cx8802 module. Something is not being > cleaned up after a userspace program crashes while using it, leaving the > DVB system in a broken state. > > I'd very much like this to not be the case, since on my system a VDR crash > is somewhat inevitable, and the automatic restart *was* very handy, back in > 2.6.25. Deafening silence. Does nobody have a clue? Or care? I just noticed I posted to the linux-dvb list which has been deprecated, so I'm quoting it here in its entirety in case relevent people missed it. Is there anything else I can do? Peace, Brendon
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