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SubjectRe: [btrfs] BUG: unable to handle kernel NULL pointer dereference at 0000000000000038
On Fri, 7 Feb 2014, 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".
>

It's dying on pr_cont_kernfs_name which is some tree that has "kernfs:
implement kernfs_get_parent(), kernfs_name/path() and friends", which is
not in linux-next, and is obviously printing the cpuset cgroup name.

It doesn't look like it has anything at all to do with btrfs or why they
would care about this failure.


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