Re: [PATCH v2] Fix lockup related to stop_machine being stuck in__do_softirq.

From: Ben Greear
Date: Thu Jun 06 2013 - 17:33:32 EST

On 06/06/2013 01:48 PM, Tejun Heo wrote:

As wrote before, a brief explanation on why both are necessary would
be nice. Something like - "the time limit prevents from introducing
excessive latency from softirq handling and the loop limit protects
against softirq runaway which may happen during stop_machine - see

Please cc Linus and also cc stable@xxxxxxxxxxxxxxxx We definitely
want this backported.

v3 was sent, with updated comments and expanded CC list.

The patch is against 3.9.4, though I assume it will apply
to the upstream kernel easily enough.

I didn't want to add a link to the email thread.. The commit message
and patch has enough info that I think an interested party could find
the email thread easily enough if they needed more history.

And, much of the email thread is me running in circles thinking
I am going insane :)


Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc

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