linux-kernel - Re: [patch for-3.7] mm, mempolicy: fix printing stack contents in numa

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Date:	Wed, 24 Oct 2012 19:37:08 -0400
From:	Sasha Levin <levinsasha928@...il.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Dave Jones <davej@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	bhutchings@...arflare.com,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Hugh Dickins <hughd@...gle.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [patch for-3.7] mm, mempolicy: fix printing stack contents in numa_maps

On Wed, Oct 24, 2012 at 7:34 PM, David Rientjes <rientjes@...gle.com> wrote:
> On Wed, 24 Oct 2012, Sasha Levin wrote:
>
>> I'm not sure about the status of the patch, but it doesn't apply on
>> top of -next, and I still
>> see the warnings when fuzzing on -next.
>>
>
> This should be fixed by 9e7814404b77 ("hold task->mempolicy while
> numa_maps scans.") in 3.7-rc2, can you reproduce any issues reading
> /proc/pid/numa_maps on that kernel?

I was actually referring to the warnings Dave Jones saw when fuzzing
with trinity after the
original patch was applied.

I still see the following when fuzzing:

[  338.467156] BUG: sleeping function called from invalid context at
kernel/mutex.c:269
[  338.473719] in_atomic(): 1, irqs_disabled(): 0, pid: 6361, name: trinity-main
[  338.481199] 2 locks held by trinity-main/6361:
[  338.486629]  #0:  (&mm->mmap_sem){++++++}, at: [<ffffffff810aa314>]
__do_page_fault+0x1e4/0x4f0
[  338.498783]  #1:  (&(&mm->page_table_lock)->rlock){+.+...}, at:
[<ffffffff8122f017>] handle_pte_fault+0x3f7/0x6a0
[  338.511409] Pid: 6361, comm: trinity-main Tainted: G        W
3.7.0-rc2-next-20121024-sasha-00001-gd95ef01-dirty #74
[  338.530318] Call Trace:
[  338.534088]  [<ffffffff8114e393>] __might_sleep+0x1c3/0x1e0
[  338.539358]  [<ffffffff83ae5209>] mutex_lock_nested+0x29/0x50
[  338.545253]  [<ffffffff8124fc3e>] mpol_shared_policy_lookup+0x2e/0x90
[  338.545258]  [<ffffffff81219ebe>] shmem_get_policy+0x2e/0x30
[  338.545264]  [<ffffffff8124e99a>] get_vma_policy+0x5a/0xa0
[  338.545267]  [<ffffffff8124fce1>] mpol_misplaced+0x41/0x1d0
[  338.545272]  [<ffffffff8122f085>] handle_pte_fault+0x465/0x6a0
[  338.545278]  [<ffffffff81131e04>] ? __rcu_read_unlock+0x44/0xb0
[  338.545282]  [<ffffffff81230baa>] handle_mm_fault+0x32a/0x360
[  338.545286]  [<ffffffff810aa5b0>] __do_page_fault+0x480/0x4f0
[  338.545293]  [<ffffffff8111a706>] ? del_timer+0x26/0x80
[  338.545298]  [<ffffffff811c7313>] ? rcu_cleanup_after_idle+0x23/0x170
[  338.545302]  [<ffffffff811ca9a4>] ? rcu_eqs_exit_common+0x64/0x3a0
[  338.545305]  [<ffffffff811c8c66>] ? rcu_eqs_enter_common+0x7c6/0x970
[  338.545309]  [<ffffffff811cafdc>] ? rcu_eqs_exit+0x9c/0xb0
[  338.545312]  [<ffffffff810aa666>] do_page_fault+0x26/0x40
[  338.545317]  [<ffffffff810a3a40>] do_async_page_fault+0x30/0xa0
[  338.545321]  [<ffffffff83ae9268>] async_page_fault+0x28/0x30
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