linux-kernel - Re: [PATCH 3/4 v3] smp_call_function_many: handle concurrent clearing of mask

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Date:	Tue, 15 Mar 2011 22:32:25 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Milton Miller <miltonm@....com>
Cc:	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	Mike Galbraith <efault@....de>,
	Dimitri Sivanich <sivanich@....com>,
	Tony Luck <tony.luck@...el.com>,
	Jan Beulich <JBeulich@...ell.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Anton Blanchard <anton@...ba.org>,
	"xiaoguangrong@...fujitsu.com" <xiaoguangrong@...fujitsu.com>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"jaxboe@...ionio.com" <jaxboe@...ionio.com>,
	"npiggin@...il.com" <npiggin@...il.com>,
	"rusty@...tcorp.com.au" <rusty@...tcorp.com.au>,
	"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
	"paulmck@...ux.vnet.ibm.com" <paulmck@...ux.vnet.ibm.com>,
	"benh@...nel.crashing.org" <benh@...nel.crashing.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4 v3] smp_call_function_many: handle concurrent clearing
 of mask

On Tuesday, 15 March 2011, Milton Miller <miltonm@....com> wrote:
> Mike Galbraith reported finding a lockup ("perma-spin bug") where the
> cpumask passed to smp_call_function_many was cleared by other cpu(s)
> while a cpu was preparing its call_data block, resulting in no cpu to
> clear the last ref and unlock the block.

I missed your patch and just posted something similar. I'll leave it
to you then ;)

https://lkml.org/lkml/2011/3/15/296

Catalin

-- 
Catalin
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