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

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Message-ID: <20121017040515.GA13505@redhat.com>
Date:	Wed, 17 Oct 2012 00:05:15 -0400
From:	Dave Jones <davej@...hat.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	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 Tue, Oct 16, 2012 at 05:31:23PM -0700, David Rientjes wrote:

 > -	pol = get_vma_policy(proc_priv->task, vma, vma->vm_start);
 > +	task_lock(task);
 > +	pol = get_vma_policy(task, vma, vma->vm_start);
 >  	mpol_to_str(buffer, sizeof(buffer), pol, 0);
 >  	mpol_cond_put(pol);
 > +	task_unlock(task);

This seems to cause some fallout for me..

BUG: sleeping function called from invalid context at kernel/mutex.c:269
in_atomic(): 1, irqs_disabled(): 0, pid: 8558, name: trinity-child2
3 locks on stack by trinity-child2/8558:
 #0: held:     (&p->lock){+.+.+.}, instance: ffff88010c9a00b0, at: [<ffffffff8120cd1f>] seq_lseek+0x3f/0x120
 #1: held:     (&mm->mmap_sem){++++++}, instance: ffff88013956f7c8, at: [<ffffffff81254437>] m_start+0xa7/0x190
 #2: held:     (&(&p->alloc_lock)->rlock){+.+...}, instance: ffff88011fc64f30, at: [<ffffffff81254f8f>] show_numa_map+0x14f/0x610
Pid: 8558, comm: trinity-child2 Not tainted 3.7.0-rc1+ #32
Call Trace:
 [<ffffffff810ae4ec>] __might_sleep+0x14c/0x200
 [<ffffffff816bdf4e>] mutex_lock_nested+0x2e/0x50
 [<ffffffff811c43a3>] mpol_shared_policy_lookup+0x33/0x90
 [<ffffffff8118d5c3>] shmem_get_policy+0x33/0x40
 [<ffffffff811c31fa>] get_vma_policy+0x3a/0x90
 [<ffffffff81254fa3>] show_numa_map+0x163/0x610
 [<ffffffff81255b10>] ? pid_maps_open+0x20/0x20
 [<ffffffff81255980>] ? pagemap_hugetlb_range+0xf0/0xf0
 [<ffffffff81255483>] show_pid_numa_map+0x13/0x20
 [<ffffffff8120c902>] traverse+0xf2/0x230
 [<ffffffff8120cd8b>] seq_lseek+0xab/0x120
 [<ffffffff811e6c0b>] sys_lseek+0x7b/0xb0
 [<ffffffff816ca088>] tracesys+0xe1/0xe6


same problem, different syscall..


BUG: sleeping function called from invalid context at kernel/mutex.c:269
in_atomic(): 1, irqs_disabled(): 0, pid: 21996, name: trinity-child3
3 locks on stack by trinity-child3/21996:
 #0: held:     (&p->lock){+.+.+.}, instance: ffff88008d712c08, at: [<ffffffff8120ce3d>] seq_read+0x3d/0x3e0
 #1: held:     (&mm->mmap_sem){++++++}, instance: ffff88013956f7c8, at: [<ffffffff81254437>] m_start+0xa7/0x190
 #2: held:     (&(&p->alloc_lock)->rlock){+.+...}, instance: ffff88011fc64f30, at: [<ffffffff81254f8f>] show_numa_map+0x14f/0x610
Pid: 21996, comm: trinity-child3 Not tainted 3.7.0-rc1+ #32
Call Trace:
 [<ffffffff810ae4ec>] __might_sleep+0x14c/0x200
 [<ffffffff816bdf4e>] mutex_lock_nested+0x2e/0x50
 [<ffffffff811c43a3>] mpol_shared_policy_lookup+0x33/0x90
 [<ffffffff8118d5c3>] shmem_get_policy+0x33/0x40
 [<ffffffff811c31fa>] get_vma_policy+0x3a/0x90
 [<ffffffff81254fa3>] show_numa_map+0x163/0x610
 [<ffffffff81255b10>] ? pid_maps_open+0x20/0x20
 [<ffffffff81255980>] ? pagemap_hugetlb_range+0xf0/0xf0
 [<ffffffff81255483>] show_pid_numa_map+0x13/0x20
 [<ffffffff8120c902>] traverse+0xf2/0x230
 [<ffffffff8120d14b>] seq_read+0x34b/0x3e0
 [<ffffffff8120ce00>] ? seq_lseek+0x120/0x120
 [<ffffffff811e751a>] do_loop_readv_writev+0x5a/0x90
 [<ffffffff811e7851>] do_readv_writev+0x1c1/0x1e0
 [<ffffffff810b0de1>] ? get_parent_ip+0x11/0x50
 [<ffffffff811e7905>] vfs_readv+0x35/0x60
 [<ffffffff811e7b72>] sys_preadv+0xc2/0xe0
 [<ffffffff816ca088>] tracesys+0xe1/0xe6


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