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Re: kernel panics with uvideo, savecores and coredumps
Christoph Egger wrote:
> I can reproduce kernel panics when two
> programs (mplayer and ekiga) *simultanously*
> try to access my webcam.
> In ddb I do "call dumpsys" or "sync" and reboot
> blindly (I'm in X when the panic happens).
> On reboot, savecore prints things like
> panic: kmem_poison_check x != y (where x and y are numbers)
> panic: extent_alloc_subregion: bad size
> To debug a crash dump I following the instructions from:
> But I always get backtraces from ddb instead the one from the panic.
> Using ps ax -M netbsd.x.core results in a segfault
> in kvm_getproc2() in libkvm.
The crash happens in lib/libkvm/kvm_proc.c , line 566:
kp2p->p_forw = kl.l_forw;
The kl pointer is NULL. kvm_getlwps() in line 560
returns NULL and there's no NULL-pointer check.
nlwps passed to kvm_getlwps() is 1.
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