2005-04-30 17:02:13

by Oleg Nesterov

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Subject: Re: Fw: [Bug 4559] New: cfq scheduler lockup: NMI oops while runningltp - 20050207 on 2.6.12-rc2-mm3 with kdump enabled

Oleg Nesterov wrote:
>
> One option is to change __mod_timer() so that it would not
> switch ->base when the timer is already running. But this
> would be behavioural change: currently __mod_timer() guarantees
> that the timer would be armed on the local cpu.

Is it acceptable? If yes, I'll send the patch tomorrow.

I don't see another solution.

Oleg.


2005-04-30 20:16:37

by Andrew Morton

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Subject: Re: Fw: [Bug 4559] New: cfq scheduler lockup: NMI oops while runningltp - 20050207 on 2.6.12-rc2-mm3 with kdump enabled

Oleg Nesterov <[email protected]> wrote:
>
> Oleg Nesterov wrote:
> >
> > One option is to change __mod_timer() so that it would not
> > switch ->base when the timer is already running. But this
> > would be behavioural change: currently __mod_timer() guarantees
> > that the timer would be armed on the local cpu.
>
> Is it acceptable? If yes, I'll send the patch tomorrow.
>
> I don't see another solution.

I don't see how it could cause any harm.