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SubjectRe: d1fc031747 ("sched/wait: assert the wait_queue_head lock is .."): EIP: __wake_up_common
On Thu, 14 Dec 2017 08:50:15 +0800 kernel test robot <fengguang.wu@intel.com> wrote:

> 0day kernel testing robot got the below dmesg and the first bad commit is
>
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
>
> commit d1fc0317472217762fa7741260ca464077b4c877
> Author: Christoph Hellwig <hch@lst.de>
> AuthorDate: Wed Dec 13 11:52:12 2017 +1100
> Commit: Stephen Rothwell <sfr@canb.auug.org.au>
> CommitDate: Wed Dec 13 16:04:58 2017 +1100
>
> sched/wait: assert the wait_queue_head lock is held in __wake_up_common
>
> Better ensure we actually hold the lock using lockdep than just commenting
> on it. Due to the various exported _locked interfaces it is far too easy
> to get the locking wrong.

I'm probably sitting on an older version. I've dropped

epoll: use the waitqueue lock to protect ep->wq
sched/wait: assert the wait_queue_head lock is held in __wake_up_common

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