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Message-ID: <AANLkTinZX23QwpTN92RLAH6LkxgHZhawrL+dFXTzAs98@mail.gmail.com>
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
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Catalin
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