linux-kernel - Re: [-mm] warning during suspend [was: suspend race -mm regression]

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Message-Id: <20090910135745.61de2be6.akpm@linux-foundation.org>
Date:	Thu, 10 Sep 2009 13:57:45 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Xiao Guangrong <ericxiao.gr@...il.com>
Cc:	jirislaby@...il.com, rjw@...k.pl, linux-kernel@...r.kernel.org,
	suresh.b.siddha@...el.com, npiggin@...e.de, hpa@...or.com,
	xiaoguangrong@...fujitsu.com, peterz@...radead.org,
	rusty@...tcorp.com.au, mingo@...e.hu, jens.axboe@...cle.com
Subject: Re: [-mm] warning during suspend [was: suspend race -mm regression]

On Sat, 05 Sep 2009 22:41:37 +0800
Xiao Guangrong <ericxiao.gr@...il.com> wrote:

> Jiri Slaby ______:
> > On 09/05/2009 12:36 AM, Jiri Slaby wrote:
> >> On 09/05/2009 12:30 AM, Jiri Slaby wrote:
> >>> WARNING: at kernel/smp.c:124
> >>> __generic_smp_call_function_interrupt+0xfd/0x110()
> >>> Hardware name: To Be Filled By O.E.M.
> >>> Modules linked in: nfs lockd auth_rpcgss sunrpc ath5k ath
> >>> Pid: 3423, comm: pm-suspend Not tainted 2.6.31-rc8-mm1_64 #762
> >>> Call Trace:
> >>>  [<ffffffff8103fc48>] warn_slowpath_common+0x78/0xb0
> >>>  [<ffffffff8103fc8f>] warn_slowpath_null+0xf/0x20
> >>>  [<ffffffff8106950d>] __generic_smp_call_function_interrupt+0xfd/0x110
> >>>  [<ffffffff8106956a>] hotplug_cfd+0x4a/0xa0
> >>>  [<ffffffff81434e47>] notifier_call_chain+0x47/0x90
> >>>  [<ffffffff8105b311>] raw_notifier_call_chain+0x11/0x20
> >>>  [<ffffffff8141ece0>] _cpu_down+0x150/0x2d0
> >> It's the CPU_DEAD notifier:
> >> ffffffff8141ecd0:       48 83 ce 07             or     $0x7,%rsi
> >> ffffffff8141ecd4:       48 c7 c7 08 ff 5d 81    mov
> >> $0xffffffff815dff08,%rdi
> >> ffffffff8141ecdb:       e8 20 c6 c3 ff          callq  ffffffff8105b300
> >> <raw_notifier_call_chain>
> >> ffffffff8141ece0:       3d 02 80 00 00          cmp    $0x8002,%eax
> > 
> > And it's due to:
> > generic-ipi-fix-the-race-between-generic_smp_call_function_-and-hotplug_cfd.patch
> > 
> 
> I think it has collision between my patch and below patch:
> 
> Commit-ID:  269c861baa2fe7c114c3bc7831292758d29eb336
> Gitweb:     http://git.kernel.org/tip/269c861baa2fe7c114c3bc7831292758d29eb336
> Author:     Suresh Siddha <suresh.b.siddha@...el.com>
> AuthorDate: Wed, 19 Aug 2009 18:05:35 -0700
> Committer:  H. Peter Anvin <hpa@...or.com>
> CommitDate: Fri, 21 Aug 2009 16:25:43 -0700
> 
> generic-ipi: Allow cpus not yet online to call smp_call_function with irqs disabled
> 
> My patch is merged at -mm tree, but this patch is base on -tip tree later, so it has this
> problem
> 
> Suresh, what your opinion?
> 

Suresh appears to be hiding.

Could you please propose a fix for this issue?
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