Re: [PATCH v2] Fix lockup related to stop_machine being stuck in__do_softirq.
From: Eric Dumazet
Date: Thu Jun 06 2013 - 12:14:18 EST
On Thu, 2013-06-06 at 09:10 -0700, greearb@xxxxxxxxxxxxxxx wrote:
> From: Ben Greear <greearb@xxxxxxxxxxxxxxx>
> The stop machine logic can lock up if all but one of
> the migration threads make it through the disable-irq
> step and the one remaining thread gets stuck in
> __do_softirq. The reason __do_softirq can hang is
> that it has a bail-out based on jiffies timeout, but
> in the lockup case, jiffies itself is not incremented.
> Signed-off-by: Ben Greear <greearb@xxxxxxxxxxxxxxx>
> v2: Fix comments and reformat conditional per suggestions.
Acked-by: Eric Dumazet <edumazet@xxxxxxxxxx>
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