Messages in this thread | | | Date | Thu, 26 Jun 2008 15:59:23 +0200 | From | "Vegard Nossum" <> | Subject | Re: v2.6.26-rc7: BUG: unable to handle kernel NULL pointer dereference |
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On Thu, Jun 26, 2008 at 2:40 PM, Jason Wessel <jason.wessel@windriver.com> wrote: >> 4. Page fault in I'm guessing configure_kgdbts() during boot. Never >> seen this before either (screenshot #2). >> > > How often does #4 occur?
Only this once yet.
> > Perhaps you can email me directly the .config and kernel boot arguments > you used? It would be good to determine if the #4 is a victim or > culprit of the crash. If it is a culprit I would like to try and fix it.
I don't think this really has anything to do with the CPU hotplug crashing. It seems to be completely spurious, as this was during boot before userspace had even started. It's not even certain that it has anything to do with kgdb at all. I mean, that stack trace is not very reliable...
Command line was: kernel /vmlinuz-2.6.26-rc8-dirty ro root=/dev/VolGroup00/LogVol00 rhgb debug 3
You can find vmlinux and config here:
http://www.kernel.org/pub/linux/kernel/people/vegard/kernels/20080626/
..but it probably takes a bit for the mirrors to pick up. In the meantime, I can provide you with the relevant line numbers:
# configure_kgdbts $ addr2line -e vmlinux.20080626 -i c030ab18 | sed 's/.*linux-2.6\///' drivers/misc/kgdbts.c:911 drivers/misc/kgdbts.c:1015
# mtrr_del $ addr2line -e vmlinux.20080626 -i c011007b | sed 's/.*linux-2.6\///' arch/x86/kernel/cpu/mtrr/main.c:548
# loop_init $ addr2line -e vmlinux.20080626 -i c078111a | sed 's/.*linux-2.6\///' drivers/block/loop.c:1550
# init_kgdbts $ addr2line -e vmlinux.20080626 -i c0781163 | sed 's/.*linux-2.6\///' drivers/misc/kgdbts.c:1033
Thanks.
Vegard
-- "The animistic metaphor of the bug that maliciously sneaked in while the programmer was not looking is intellectually dishonest as it disguises that the error is the programmer's own creation." -- E. W. Dijkstra, EWD1036
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