linux-kernel - Re: perf sched record hangs machine

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Message-ID: <20090923122719.GC6390@elte.hu>
Date:	Wed, 23 Sep 2009 14:27:19 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Chris Malley <mail@...ismalley.co.uk>
Cc:	Cyrill Gorcunov <gorcunov@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>
Subject: Re: perf sched record hangs machine


* Chris Malley <mail@...ismalley.co.uk> wrote:

> 2009/9/23 Ingo Molnar <mingo@...e.hu>:
> >
> > * Chris Malley <mail@...ismalley.co.uk> wrote:
> >
> >> 2009/9/23 Ingo Molnar <mingo@...e.hu>:
> >> >
> >> > * Chris Malley <mail@...ismalley.co.uk> wrote:
> >> >
> >> >> Applied Peter's patch, doesn't seem to have fixed the problem:
> >> >>
> >> >> [ ?246.408893] BUG: unable to handle kernel paging request at ffffb300
> >> >> [ ?246.408939] IP: [<c011b0bd>] default_send_IPI_self+0x1d/0x50
> >> >
> >> > could you please send the full bootlog, up to the crash?
> >> >
> >> > Thanks,
> >> >
> >> > ? ? ? ?Ingo
> >> >
> >>
> >> Sure, but I'm just rebuilding from clean first in case the change
> >> wasn't picked up for some reason, because I don't see how it can get
> >> to default_send_IPI_self() in my configuration...
> >
> > yeah - i have that thinking too - according to your earlier boot
> > messages x86_pmu.apic must be 0 and that codepath shouldnt trigger.
> >
> > ? ? ? ?Ingo
> >
> 
> Yep, my bad.  The build process had helpfully appended a -dirty tag to 
> the kernel version which I hadn't noticed.
> 
> I can't make it hang any more, so the fix looks good to me, thanks 
> everyone.

Great, thanks!

	Ingo
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