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SubjectRe: INFO: task hung in __sb_start_write
On Sun, Jun 10, 2018 at 11:47:56PM +0900, Tetsuo Handa wrote:

> This looks quite strange that nobody is holding percpu_rw_semaphore for
> write but everybody is stuck trying to hold it for read. (Since there
> is no "X locks held by ..." line without followup "#0:" line, there is
> no possibility that somebody is in TASK_RUNNING state while holding
> percpu_rw_semaphore for write.)
>
> I feel that either API has a bug or API usage is wrong.
> Any idea for debugging this?

Look at percpu_rwsem_release() and usage. The whole fs freezer thing is
magic.

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