Re: [Qemu-devel] [Bug 735752] Re: qemu squeeze crashes "BUG: unable to handle kernel NULL pointer dereference at (null)"

[Stefan Hajnoczi]

On Wed, Mar 16, 2011 at 8:27 PM, Aidar Kamalov
<address@hidden> wrote:
> I have compiled with CONFIG_DEBUG_INFO, but core is not creating, i
> think i do all right:
>
> mainhost log # zcat /proc/config.gz |grep CONFIG_DEBUG_INFO
> CONFIG_DEBUG_INFO=y
> # CONFIG_DEBUG_INFO_REDUCED is not set

This looks fine

> mainhost log # cat /etc/security/limits.conf | grep core
> #        - core - limits the core file size (KB)
> *               soft    core            unlimited
> mainhost log # ulimit -S -s
> 8192
> mainhost log # ulimit -H -s
> unlimited
> mainhost log #  ulimit -S -s 100000
> mainhost log # ulimit -S -s
> 100000
> mainhost log # cat /proc/sys/kernel/core_pattern
> core
> mainhost log # cat /proc/sys/kernel/core_uses_pid
> 0
> mainhost log # ulimit -c
> unlimited
> mainhost log # yes & kill -ABRT `jobs -p`
> [1] 3527
> mainhost log #
> [1]+  Aborted         (core dumped) yes

These are core dump options for userspace processes.  You originally
posted a kernel backtrace and that is not affected by core dump
options.

When the issue is triggered again you should see function names in the
"Call Trace:" section of the BUG output.

Stefan