Alan Stern wrote, On 12/04/2007 04:17 PM:
...
> Furthermore, in this case deadlock isn't really impossible -- it could
> occur if there were a bug somewhere else in the kernel. So lockdep was
> correct to warn that deadlock might occur.
Alan, if the scenario was like you described at the beginning, there was
no deadlock possible, unless some errors in the notifier. These #1-#3
threads were only helpful to guess what lockdep could 'think', but I
guess notifier doesn't use 2 rivaling threads for a wake, so, lockdep
probably needed additional information. And you really can't consider
any hypothetical kernel bugs here because then each lock is vulnerable.
Regards,
Jarek P.
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