Date:	Tue, 3 Jan 2012 15:47:28 +0100
From:	Jan Kara <jack@...e.cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Tejun Heo <tj@...nel.org>, Jeff Layton <jlayton@...hat.com>,
	Linux PM mailing list <linux-pm@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"pavel@....cz" <pavel@....cz>, Miles Lane <miles.lane@...il.com>,
	linux-fsdevel@...r.kernel.org
Subject: Re: Freezing of tasks failed after 20.01 seconds in 3.2.0-rc4+
 (Linus GIT af968e2)

On Wed 28-12-11 23:03:26, Rafael J. Wysocki wrote:
> On Wednesday, December 28, 2011, Srivatsa S. Bhat wrote:
> > Hi,
> > 
> > Miles Lane (in CC) hit freezing failures in 3.2.0-rc4+ (Linus GIT af968e2)
> > while trying to suspend the machine.
> 
> Well, ext3 seems to be involved.  I don't see any problems with suspending
> those kernels on my test machines, but I don't use ext3 on them any more.
> 
> It would be good to rule out ext3 somehow.
  Well, both tasks that refuse to be frozen hit page fault and are waiting
for data to be read from disk which apparently does not happen. Also there
were not any changes to speak of in ext3 for a while so I don't think ext3
is a culprit here...

								Honza
> > Here is the log:
> > 
> > [ 4040.037426] Freezing user space processes ...
> > [ 4060.048526] Freezing of tasks failed after 20.01 seconds (2 tasks
> > refusing to freeze, wq_busy=0):
> > [ 4060.048534] Xorg            D ffffffff81806240     0   901    847 0x00c00004
> > [ 4060.048538]  ffff8800c3877628 0000000000000086 0000000000000082
> > ffff8800c38775d8
> > [ 4060.048551]  ffff8800c3877fd8 ffff8800c3877fd8 ffff8800c3877fd8
> > 00000000000136c0
> > [ 4060.048553]  ffff880118b3dc40 ffff8800c2cc1710 ffff8800c38775f8
> > ffff88011fb13f80
> > [ 4060.048556] Call Trace:
> > [ 4060.048562]  [<ffffffff811a6940>] ? __wait_on_buffer+0x30/0x30
> > [ 4060.048565]  [<ffffffff8165094f>] schedule+0x3f/0x60
> > [ 4060.048567]  [<ffffffff816509ff>] io_schedule+0x8f/0xd0
> > [ 4060.048569]  [<ffffffff811a694e>] sleep_on_buffer+0xe/0x20
> > [ 4060.048571]  [<ffffffff8165121f>] __wait_on_bit+0x5f/0x90
> > [ 4060.048574]  [<ffffffff812ebf08>] ? generic_make_request+0x68/0x70
> > [ 4060.048577]  [<ffffffff811a6940>] ? __wait_on_buffer+0x30/0x30
> > [ 4060.048579]  [<ffffffff816512cc>] out_of_line_wait_on_bit+0x7c/0x90
> > [ 4060.048582]  [<ffffffff81089c90>] ? autoremove_wake_function+0x40/0x40
> > [ 4060.048584]  [<ffffffff811a693e>] __wait_on_buffer+0x2e/0x30
> > [ 4060.048587]  [<ffffffff811a8761>] __bread+0x71/0xb0
> > [ 4060.048590]  [<ffffffff811f377b>] ext3_get_branch+0x8b/0x150
> > [ 4060.048593]  [<ffffffff811f6912>] ext3_get_blocks_handle+0x1a2/0x650
> > [ 4060.048595]  [<ffffffff811a8d65>] ? block_read_full_page+0x225/0x390
> > [ 4060.048598]  [<ffffffff811f6e84>] ext3_get_block+0xc4/0x120
> > [ 4060.048600]  [<ffffffff811b2172>] do_mpage_readpage+0x3b2/0x550
> > [ 4060.048604]  [<ffffffff81116d95>] ? add_to_page_cache_locked+0x85/0xa0
> > [ 4060.048606]  [<ffffffff811b246e>] mpage_readpages+0xee/0x140
> > [ 4060.048608]  [<ffffffff811f6dc0>] ? ext3_get_blocks_handle+0x650/0x650
> > [ 4060.048610]  [<ffffffff8111f3de>] ? __alloc_pages_nodemask+0x10e/0x820
> > [ 4060.048613]  [<ffffffff811f6dc0>] ? ext3_get_blocks_handle+0x650/0x650
> > [ 4060.048615]  [<ffffffff811f328d>] ext3_readpages+0x1d/0x20
> > [ 4060.048617]  [<ffffffff81121908>] read_pages+0x48/0x100
> > [ 4060.048619]  [<ffffffff81121b23>] __do_page_cache_readahead+0x163/0x180
> > [ 4060.048621]  [<ffffffff81121e91>] ra_submit+0x21/0x30
> > [ 4060.048625]  [<ffffffff8163d353>] do_sync_mmap_readahead.isra.24+0x94/0x9c
> > [ 4060.048627]  [<ffffffff81118991>] filemap_fault+0x361/0x3e0
> > [ 4060.048642]  [<ffffffffa009c37c>] ? drm_mm_kmalloc+0x6c/0xe0 [drm]
> > [ 4060.048646]  [<ffffffff81138c72>] __do_fault+0x72/0x550
> > [ 4060.048649]  [<ffffffff8130ae7b>] ? prio_tree_insert+0x12b/0x1a0
> > [ 4060.048651]  [<ffffffff8113c2aa>] handle_pte_fault+0xfa/0x200
> > [ 4060.048653]  [<ffffffff8113c768>] handle_mm_fault+0x1f8/0x350
> > [ 4060.048661]  [<ffffffffa00dced0>] ?
> > i915_gem_object_set_to_gtt_domain+0x80/0x80 [i915]
> > [ 4060.048664]  [<ffffffff816562d0>] do_page_fault+0x150/0x520
> > [ 4060.048668]  [<ffffffff810127da>] ? __switch_to+0x1ea/0x310
> > [ 4060.048670]  [<ffffffff81054f4d>] ? set_next_entity+0xad/0xd0
> > [ 4060.048673]  [<ffffffff8118821a>] ? do_vfs_ioctl+0x8a/0x340
> > [ 4060.048675]  [<ffffffff816502fc>] ? __schedule+0x3cc/0x6f0
> > [ 4060.048677]  [<ffffffff81652fb5>] page_fault+0x25/0x30
> > [ 4060.048685] gnome-settings- D 0000000000000001     0  1406   1344 0x00800004
> > [ 4060.048687]  ffff8800bd305628 0000000000000082 0000000000000082
> > ffff8800bd3055d8
> > [ 4060.048689]  ffff8800bd305fd8 ffff8800bd305fd8 ffff8800bd305fd8
> > 00000000000136c0
> > [ 4060.048692]  ffff8800885cdc40 ffff8800c1228000 ffff8800bd3055f8
> > ffff88011fa93f80
> > [ 4060.048694] Call Trace:
> > [ 4060.048696]  [<ffffffff811a6940>] ? __wait_on_buffer+0x30/0x30
> > [ 4060.048698]  [<ffffffff8165094f>] schedule+0x3f/0x60
> > [ 4060.048700]  [<ffffffff816509ff>] io_schedule+0x8f/0xd0
> > [ 4060.048702]  [<ffffffff811a694e>] sleep_on_buffer+0xe/0x20
> > [ 4060.048704]  [<ffffffff8165121f>] __wait_on_bit+0x5f/0x90
> > [ 4060.048706]  [<ffffffff812ebf08>] ? generic_make_request+0x68/0x70
> > [ 4060.048708]  [<ffffffff811a6940>] ? __wait_on_buffer+0x30/0x30
> > [ 4060.048710]  [<ffffffff816512cc>] out_of_line_wait_on_bit+0x7c/0x90
> > [ 4060.048712]  [<ffffffff81089c90>] ? autoremove_wake_function+0x40/0x40
> > [ 4060.048714]  [<ffffffff811a693e>] __wait_on_buffer+0x2e/0x30
> > [ 4060.048716]  [<ffffffff811a8761>] __bread+0x71/0xb0
> > [ 4060.048719]  [<ffffffff811f377b>] ext3_get_branch+0x8b/0x150
> > [ 4060.048721]  [<ffffffff811f6912>] ext3_get_blocks_handle+0x1a2/0x650
> > [ 4060.048724]  [<ffffffff8104cd93>] ? __wake_up+0x53/0x70
> > [ 4060.048727]  [<ffffffff814072a5>] ? loop_make_request+0xe5/0x120
> > [ 4060.048729]  [<ffffffff812ebaf4>] ? generic_make_request.part.50+0x74/0xb0
> > [ 4060.048732]  [<ffffffff811f6e84>] ext3_get_block+0xc4/0x120
> > [ 4060.048734]  [<ffffffff811b2172>] do_mpage_readpage+0x3b2/0x550
> > [ 4060.048736]  [<ffffffff81116d95>] ? add_to_page_cache_locked+0x85/0xa0
> > [ 4060.048738]  [<ffffffff811b246e>] mpage_readpages+0xee/0x140
> > [ 4060.048740]  [<ffffffff811f6dc0>] ? ext3_get_blocks_handle+0x650/0x650
> > [ 4060.048742]  [<ffffffff8111f3de>] ? __alloc_pages_nodemask+0x10e/0x820
> > [ 4060.048744]  [<ffffffff811f6dc0>] ? ext3_get_blocks_handle+0x650/0x650
> > [ 4060.048747]  [<ffffffff8165135d>] ? mutex_lock+0x1d/0x50
> > [ 4060.048749]  [<ffffffff811f328d>] ext3_readpages+0x1d/0x20
> > [ 4060.048751]  [<ffffffff81121908>] read_pages+0x48/0x100
> > [ 4060.048753]  [<ffffffff81121b23>] __do_page_cache_readahead+0x163/0x180
> > [ 4060.048755]  [<ffffffff81121e91>] ra_submit+0x21/0x30
> > [ 4060.048757]  [<ffffffff8163d353>] do_sync_mmap_readahead.isra.24+0x94/0x9c
> > [ 4060.048759]  [<ffffffff81118991>] filemap_fault+0x361/0x3e0
> > [ 4060.048761]  [<ffffffff81188fe0>] ? __pollwait+0xf0/0xf0
> > [ 4060.048764]  [<ffffffff81138c72>] __do_fault+0x72/0x550
> > [ 4060.048766]  [<ffffffff8113c2aa>] handle_pte_fault+0xfa/0x200
> > [ 4060.048767]  [<ffffffff8113c768>] handle_mm_fault+0x1f8/0x350
> > [ 4060.048769]  [<ffffffff816562d0>] do_page_fault+0x150/0x520
> > [ 4060.048773]  [<ffffffff8129a2b3>] ? security_file_permission+0x93/0xb0
> > [ 4060.048777]  [<ffffffff81175f41>] ? rw_verify_area+0x61/0xf0
> > [ 4060.048778]  [<ffffffff811764d5>] ? vfs_read+0x165/0x180
> > [ 4060.048780]  [<ffffffff81652fb5>] page_fault+0x25/0x30
> > 
> > Regards,
> > Srivatsa S. Bhat
> > 
> > 
> > 
> 
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-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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