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Subject: [Bug 193367] [panic] sleeping thread
Date: Thu, 27 Nov 2014 21:20:49 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193367

--- Comment #9 from Eygene Ryabinkin <rea@FreeBSD.org> ---
(In reply to sasamotikomi from comment #6)
> (In reply to John Baldwin from comment #5)
> > In all these crashes, the root bug is a NULL pointer dereference (probably)
> > at drm_ioctl+0x2ca.  Can you provide the kgdb backtrace from a single
> > core.txt file?  It would be good to see what source line corresponds to that
> > address.
> I still have old GENERIC kernel (/boot/kernel.old.9.1/kernel) how to do that?
> I new for kernel debugging.

Try the following:
{{{
cd /boot/kernel.old.9.1
kgdb drm2.ko
list *(drm_ioctl+0x2ca)
}}}
This assumes that you have drm2.ko and its symbolic information
(drm2.ko.symbols) is present too.

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