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Re: __blkg_lookup oops with 4.2-rcX

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Hello,

On Wed, Sep 02, 2015 at 10:53:07AM -0400, Tejun Heo wrote:
> On Sun, Aug 30, 2015 at 08:30:41AM -0400, Josh Boyer wrote:
> I think the offending commit is 776687bce42b ("block, blk-mq: draining
> can't be skipped even if bypass_depth was non-zero").  It looks like
> the patch makes shutdown path travel data structure which is already
> destroyed.  Will post the fix soon.

Hmm... I can't reproduce it here or see how such oops would happen.

* Is the problem reproducible on v4.2?  If so, can you please describe
  the steps to reproduce?  How is cgroup set up?

* Can you please run gdb or addr2line on it and report which line is
  causing the oops?

Thanks.

-- 
tejun
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Thread

__blkg_lookup oops with 4.2-rcX Josh Boyer <jwboyer@fedoraproject.org> - 2015-08-30 14:40 +0200
  Re: __blkg_lookup oops with 4.2-rcX "Richard W.M. Jones" <rjones@redhat.com> - 2015-08-30 20:10 +0200
  Re: __blkg_lookup oops with 4.2-rcX Tejun Heo <tj@kernel.org> - 2015-09-02 17:00 +0200
    Re: __blkg_lookup oops with 4.2-rcX Tejun Heo <tj@kernel.org> - 2015-09-02 17:40 +0200
      Re: __blkg_lookup oops with 4.2-rcX "Richard W.M. Jones" <rjones@redhat.com> - 2015-09-04 12:50 +0200
        Re: __blkg_lookup oops with 4.2-rcX Tejun Heo <tj@kernel.org> - 2015-09-04 19:20 +0200
          Re: __blkg_lookup oops with 4.2-rcX "Richard W.M. Jones" <rjones@redhat.com> - 2015-09-04 22:50 +0200
            Re: __blkg_lookup oops with 4.2-rcX "Richard W.M. Jones" <rjones@redhat.com> - 2015-09-05 17:50 +0200
              Re: __blkg_lookup oops with 4.2-rcX Tejun Heo <tj@kernel.org> - 2015-09-05 20:40 +0200
                [PATCH block/for-linus] block: blkg_destroy_all() should clear  q->root_blkg and ->root_rl.blkg Tejun Heo <tj@kernel.org> - 2015-09-05 21:50 +0200
                Re: [PATCH block/for-linus] block: blkg_destroy_all() should clear  q->root_blkg and ->root_rl.blkg "Richard W.M. Jones" <rjones@redhat.com> - 2015-09-06 10:40 +0200

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