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Date: Thu, 29 Mar 2012 04:48:57 -0400
From: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Organization: NEC Corporation
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To: David Rientjes <rientjes@google.com>
CC: Dave Jones <davej@redhat.com>, Linux Kernel <linux-kernel@vger.kernel.org>,
        Sasha Levin <levinsasha928@gmail.com>
Subject: Re: BUG: sleeping function called from invalid context at fs/proc/task_mmu.c:826
References: <20120328181820.GB14224@redhat.com> <alpine.DEB.2.00.1203281706430.8554@chino.kir.corp.google.com>
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(3/28/2012 20:09), David Rientjes wrote:
> On Wed, 28 Mar 2012, Dave Jones wrote:
> 
>> Just hit this on v3.3-7919-g6658a69
>>
>> 	Dave
>>
>> BUG: sleeping function called from invalid context at fs/proc/task_mmu.c:826
>> in_atomic(): 1, irqs_disabled(): 0, pid: 15123, name: trinity
>> INFO: lockdep is turned off.
>> Pid: 15123, comm: trinity Not tainted 3.3.0+ #30
>> Call Trace:
>>  [<ffffffff8109bf75>] __might_sleep+0x145/0x200
>>  [<ffffffff8122ee77>] ? pagemap_pte_range+0x67/0x340
>>  [<ffffffff8122ef3f>] pagemap_pte_range+0x12f/0x340
>>  [<ffffffff811924b9>] walk_page_range+0x389/0x520
>>  [<ffffffff8122e9a2>] pagemap_read+0x282/0x350
>>  [<ffffffff8122ee10>] ? clear_refs_pte_range+0x180/0x180
>>  [<ffffffff8122d340>] ? get_vmalloc_info+0x110/0x110
>>  [<ffffffff8122e5c0>] ? pid_numa_maps_open+0x20/0x20
>>  [<ffffffff811c3a43>] vfs_read+0xb3/0x180
>>  [<ffffffff811c3b5d>] sys_read+0x4d/0x90
>>  [<ffffffff816c02a9>] system_call_fastpath+0x16/0x1b
>>
> 
> This looks like it was already reported as 
> http://marc.info/?l=linux-kernel&m=133289254323384 by Sasha Levin.  We're 
> waiting for a patch to push to stable from Naoya Horiguchi.

I posted a fix patch.
Please see http://marc.info/?l=linux-mm&m=133301049801146&w=2

Thanks,
Naoya