On Tue, 16 Oct 2007 12:54:29 +0400 Alexey Dobriyan <[email protected]> wrote:
> Got this during LTP's diotest1. Reproducable.
>
> =======================================================
> [ INFO: possible circular locking dependency detected ]
> 2.6.23-65a6ec0d72a07f16719e9b7a96e1c4bae044b591 #2
> -------------------------------------------------------
> diotest1/13563 is trying to acquire lock:
> (&mm->mmap_sem){----}, at: [<c107a7b7>] dio_get_page+0x4b/0x16b
>
> but task is already holding lock:
> (jbd_handle){--..}, at: [<c1099b05>] journal_start+0xf3/0x120
>
> which lock already depends on the new lock.
Someone taught lockdep about journal_start? That's gonna hurt.
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