Re: [PATCH] delay accounting taskstats interface: send tgid once locking fix

[Michal Piotrowski]

Hi,

On 27/06/06, Shailabh Nagar <nagar@xxxxxxxxxxxxxx> wrote:
> Use irqsave variants of spin_lock for newly introduced tsk->signal->stats_lock
> The lock is nested within tasklist_lock as part of release_task() and hence
> there is possibility of a AB-BA deadlock if a timer interrupt occurs while
> stats_lock is held.
>
> Thanks to Arjan van de Ven for pointing out the lock bug.
> The patch conservatively converts all use of stats_lock to irqsave variant
> rather than only the call within taskstats_tgid_free which is the function
> called within tasklist_lock protection.
>
> Signed-off-by: Shailabh Nagar <nagar@xxxxxxxxxxxxxx>

Problem solved, thanks.

Regards,
Michal

--
Michal K. K. Piotrowski
LTG - Linux Testers Group
(http://www.stardust.webpages.pl/ltg/wiki/)
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