Messages in this thread | | | Date | Fri, 16 Mar 2012 12:20:36 +0800 | From | Fengguang Wu <> | Subject | Re: [PATCH block/for-3.4/core] cfq: fix cfqg ref handling when BLK_CGROUP && !CFQ_GROUP_IOSCHED |
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On Thu, Mar 15, 2012 at 09:35:46AM -0700, Tejun Heo wrote: > When BLK_CGROUP is enabled but CFQ_GROUP_IOSCHED is, cfq ends up > calling blkg_get/put() on dummy cfqg leading to the following crash. > > BUG: unable to handle kernel NULL pointer dereference at 00000000000000b0 > IP: [<ffffffff813d44d8>] cfq_init_queue+0x258/0x430
> Reported-by: Fengguang Wu <fengguang.wu@intel.com> > Signed-off-by: Tejun Heo <tj@kernel.org>
Tested-by: Fengguang Wu <fengguang.wu@intel.com>
Thanks for the quick fix!
> --- > Yeap, forgot to test that config combination. Fengguang, can you > please test this patch? Jens, once Fengguang confirms the fix, can > you please apply this on top of for-3.4/core along with the pending > stats updates?
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