Re: [btrfs] BUG: unable to handle kernel NULL pointer dereferenceat 0000000000000038

From: Chris Mason
Date: Fri Feb 07 2014 - 10:09:21 EST

On Fri 07 Feb 2014 07:10:38 AM EST, Fengguang Wu wrote:
On Fri, Feb 07, 2014 at 02:13:59AM -0800, David Rientjes wrote:
On Fri, 7 Feb 2014, Fengguang Wu wrote:

[ 1.625020] BTRFS: selftest: Running btrfs_split_item tests
[ 1.627004] BTRFS: selftest: Running find delalloc tests
[ 2.289182] tsc: Refined TSC clocksource calibration: 2299.967 MHz
[ 292.084537] kthreadd invoked oom-killer: gfp_mask=0x3000d0, order=1, oom_score_adj=0
[ 292.086439] kthreadd cpuset=
[ 292.087072] BUG: unable to handle kernel NULL pointer dereference at 0000000000000038
[ 292.087372] IP: [<ffffffff812119de>] pr_cont_kernfs_name+0x1b/0x6c

This looks like a problem with the cpuset cgroup name, are you sure this
isn't related to the removal of cgroup->name?

It looks not related to patch "cgroup: remove cgroup->name", because
that patch lies in the cgroup tree and not contained in output of "git log BAD_COMMIT".

Still not sure exactly what is going on, but I can't trigger it here. My first guess is that it is related to having btrfs static, some part of our init is happening at the wrong time, and the self tests are swooping in and causing trouble.

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