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Date: Mon, 28 May 2007 10:12:24 +0100
From: Russell King <rmk+lkml@arm.linux.org.uk>
To: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>,
       Rusty Russell <rusty@rustcorp.com.au>,
       Srivatsa Vaddagiri <vatsa@in.ibm.com>,
       Zwane Mwaikambo <zwane@arm.linux.org.uk>,
       Nathan Lynch <nathanl@austin.ibm.com>,
       Joel Schopp <jschopp@austin.ibm.com>, Ashok Raj <ashok.raj@intel.com>,
       Heiko Carstens <heiko.carstens@de.ibm.com>,
       Gautham R Shenoy <ego@in.ibm.com>
Subject: Re: [BUG] CPU hotplug: system hang on CPU hot remove during oprofile
Message-ID: <20070528091224.GA26046@flint.arm.linux.org.uk>
Mail-Followup-To: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>,
	Linux Kernel <linux-kernel@vger.kernel.org>,
	Rusty Russell <rusty@rustcorp.com.au>,
	Srivatsa Vaddagiri <vatsa@in.ibm.com>,
	Zwane Mwaikambo <zwane@arm.linux.org.uk>,
	Nathan Lynch <nathanl@austin.ibm.com>,
	Joel Schopp <jschopp@austin.ibm.com>,
	Ashok Raj <ashok.raj@intel.com>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	Gautham R Shenoy <ego@in.ibm.com>
References: <87k5utblbp.wl%takeuchi_satoru@jp.fujitsu.com>
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On Mon, May 28, 2007 at 01:53:30PM +0900, Satoru Takeuchi wrote:
> I found a bug on CPU hotplug. If oprofile is running, CPU hot remove causes
> system hang. I only confirm that this problem occurs on my ia64 box. I'm glad
> if someone report about other arch.

oprofile is not CPU hotplug safe.  (It should probably be made so,
but I think that would require a redesign, or at least a rewrite of
the backends.)

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:
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