linux-kernel - Re: perf sched record hangs machine

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Message-ID: <7863dc4c0909230520o8338114uf63b9d5e6f4b6c4e@mail.gmail.com>
Date:	Wed, 23 Sep 2009 13:20:47 +0100
From:	Chris Malley <mail@...ismalley.co.uk>
To:	Ingo Molnar <mingo@...e.hu>
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

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.

Chris
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