linux-kernel - Re: OProfile issues

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Message-ID: <20070612183747.GF3457@sequoia.sous-sol.org>
Date:	Tue, 12 Jun 2007 11:37:47 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	Stephane Eranian <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

* Stephane Eranian (eranian@....hp.com) 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.

This is fixed in 2.6.22-rc4 in commit 0939c17c7bcf1c838bea4445b80a6966809a438f

thanks,
-chris
-
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