Messages in this thread | | | Date | Mon, 11 Jun 2018 09:30:38 +0200 | From | Peter Zijlstra <> | Subject | Re: INFO: task hung in __sb_start_write |
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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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