On Tue, 4 Feb 2014, kosaki.motohiro@xxxxxxxxx wrote:
> From: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
>
> To use spin_{un}lock_irq is dangerous if caller disabled interrupt.
> During aio buffer migration, we have a possibility to see the
> following call stack.
>
> aio_migratepage [disable interrupt]
> migrate_page_copy
> clear_page_dirty_for_io
> set_page_dirty
> __set_page_dirty_buffers
> __set_page_dirty
> spin_lock_irq
>
> This mean, current aio migration is a deadlockable. spin_lock_irqsave
> is a safer alternative and we should use it.
>
> Reported-by: David Rientjes rientjes@xxxxxxxxxx>
> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
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