Messages in this thread | | | From | Dmitry Vyukov <> | Date | Mon, 11 Jun 2018 09:39:07 +0200 | Subject | Re: INFO: task hung in __sb_start_write |
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On Mon, Jun 11, 2018 at 9:30 AM, Peter Zijlstra <peterz@infradead.org> wrote: > 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.
Do you mean that we froze fs? We tried to never-ever issue ioctl(FIFREEZE) during fuzzing. Are there other ways to do this?
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