linux-kernel - Re: OProfile issues

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Message-ID: <466EE818.4050306@redhat.com>
Date:	Tue, 12 Jun 2007 14:38:16 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	eranian@....hp.com
CC:	oprofile-list@...ts.sourceforge.net, wcohen@...hat.com, ak@...e.de,
	perfmon@...ali.hpl.hp.com, linux-kernel@...r.kernel.org,
	levon@...ementarian.org
Subject: Re: OProfile issues

On 06/12/2007 11:02 AM, Stephane Eranian wrote:
>  * allocate_msrs() allocates two tables per CPU. One for the
>    counters, the other for the eventsel registers. But then
>    nmi_setup() copies the cpu_msrs[0] into cpu_msrs[] of all
>    other cpus. This operation overrides the cpu_msrs[].counters
>    and cpu_msrs[].controls pointers for all CPUs but CPU0.
>    But free_msrs() will free the same tables multiple times. This
>    causes a kernel dump when you enable certain kernel debugging
>    features. The fix is to copy the content of the counters and
>    controls array, not the pointers.
> 

How old is the kernel you are looking at?

http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=0939c17c7bcf1c838bea4445b80a6966809a438f

...fixed this over 10 days ago.
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