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Date: Thu, 05 Feb 2009 09:54:16 -0200
From: Federico Cuello <fedux@...men.org.ar>
To: Nick Piggin <nickpiggin@...oo.com.au>
CC: Ralf Hildebrandt <Ralf.Hildebrandt@...rite.de>,
Artem Bityutskiy <Artem.Bityutskiy@...ia.com>,
linux-kernel@...r.kernel.org
Subject: Re: sync-Regression in 2.6.28.2?
Nick Piggin wrote:
> On Thursday 05 February 2009 04:31:00 Federico Cuello wrote:
>
>> Nick Piggin wrote:
>>
>>> [...]
>>> Thanks, could you reply-to-all when replying to retain ccs please?
>>>
>>> Common theme is ext4, which uses no_nrwrite_index_update, and I
>>> introduced a bug in there which could possibly cause ext4 to go into a
>>> loop...
>>>
>>> Would it be possible if you can test the following patch?
>>>
>> I'll test it as soon as I get home.
>>
>
> Thanks.
>
>
>
>> Meanwhile, I think the new patch may be slightly wrong. If I understand
>> correctly PageWriteback(page) is called before nr_to_write is tested for
>> being > 0 and then decremented if true, but "done" is not set to 1
>> until the next iteration. So another call to PageWriteback(page) while
>> take place and then "done" will be set to true (if wbc->sync_mode ==
>> WB_SYNC_NONE).
>>
>> If nr_to_write == 1 at the beginning of the loop then two pages will be
>> written.
>>
>> I think the test condition should something like:
>>
>> if (--nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) {
>> done = 1;
>> break;
>> }
>>
>
> I think you're quite right. Good catch. We probably want to prevent
> nr_to_write from going -ve, though.
>
> I think something like this
>
> if (nr_to_write > 0)
> nr_to_write--;
> if (!nr_to_write && wbc->sync_mode == WB_SYNC_NONE) {
> ...
>
> Would you care to send a patch?
>
Ok, after extensive testing I haven't been able to solve the problem.
I'm posting below the patch I used. I tried 3 different patches with one
successful test run with the one you sent me. I don't know if it was
just a coincidence as I had no time to test it again.
Now, with the patch below, it stalls with 50% IO-wait (dual core, one
core at 100%). Perhaps the patch is part of the solution, I don't know.
I also have the sysrq-W logs and I'm also posting them below.
Thanks,
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 08d2b96..9e2ae50 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -981,13 +981,23 @@ continue_unlock:
}
}
- if (wbc->sync_mode == WB_SYNC_NONE) {
- wbc->nr_to_write--;
- if (wbc->nr_to_write <= 0) {
+ if (nr_to_write > 0) {
+ nr_to_write--;
+ if (nr_to_write == 0 && wbc->sync_mode
== WB_SYNC_NONE) {
+ /*
+ * We stop writing back only if
we are not
+ * doing integrity sync. In case
of integrity
+ * sync we have to keep going
because someone
+ * may be concurrently dirtying
pages, and we
+ * might have synced a lot of
newly appeared
+ * dirty pages, but have not
synced all of the
+ * old dirty pages.
+ */
done = 1;
break;
}
}
+
if (wbc->nonblocking && bdi_write_congested(bdi)) {
wbc->encountered_congestion = 1;
done = 1;
Feb 5 03:15:19 kaoz [ 1953.633858] SysRq : Show Blocked State
Feb 5 03:15:19 kaoz [ 1953.634882] task PC stack pid father
Feb 5 03:15:19 kaoz [ 1953.634896] kjournald2 D ffff880001020c20 0 4713 2
Feb 5 03:15:19 kaoz [ 1953.634904] ffff88007e4edd50 0000000000000046 ffff8800582e2900 ffff88007e64a840
Feb 5 03:15:19 kaoz [ 1953.634912] ffffffff805de000 ffff88007eb4ec10 ffff88007f862220 ffff88007eb4ee78
Feb 5 03:15:19 kaoz [ 1953.634919] 0000000100000000 0000000100057f3b ffff88007eb4ee78 ffff88007edc0090
Feb 5 03:15:19 kaoz [ 1953.634926] Call Trace:
Feb 5 03:15:19 kaoz [ 1953.634938] [<ffffffff8022e110>] update_curr+0xd0/0x140
Feb 5 03:15:19 kaoz [ 1953.634949] [<ffffffff8031d5e1>] jbd2_journal_commit_transaction+0x171/0x1240
Feb 5 03:15:19 kaoz [ 1953.634957] [<ffffffff8023048f>] dequeue_task_fair+0x3f/0xc0
Feb 5 03:15:19 kaoz [ 1953.634963] [<ffffffff8022e677>] dequeue_task+0x57/0x70
Feb 5 03:15:19 kaoz [ 1953.634972] [<ffffffff80474d27>] thread_return+0x3d/0x5e6
Feb 5 03:15:19 kaoz [ 1953.634979] [<ffffffff80251d20>] autoremove_wake_function+0x0/0x30
Feb 5 03:15:19 kaoz [ 1953.634986] [<ffffffff802461a4>] lock_timer_base+0x34/0x70
Feb 5 03:15:19 kaoz [ 1953.634991] [<ffffffff80246234>] try_to_del_timer_sync+0x54/0x60
Feb 5 03:15:19 kaoz [ 1953.634998] [<ffffffff80322598>] kjournald2+0xd8/0x230
Feb 5 03:15:19 kaoz [ 1953.635004] [<ffffffff80251d20>] autoremove_wake_function+0x0/0x30
Feb 5 03:15:19 kaoz [ 1953.635009] [<ffffffff803224c0>] kjournald2+0x0/0x230
Feb 5 03:15:19 kaoz [ 1953.635014] [<ffffffff80251957>] kthread+0x47/0x80
Feb 5 03:15:19 kaoz [ 1953.635020] [<ffffffff80238697>] schedule_tail+0x27/0x70
Feb 5 03:15:19 kaoz [ 1953.635026] [<ffffffff8020c7e9>] child_rip+0xa/0x11
Feb 5 03:15:19 kaoz [ 1953.635031] [<ffffffff80251910>] kthread+0x0/0x80
Feb 5 03:15:19 kaoz [ 1953.635036] [<ffffffff8020c7df>] child_rip+0x0/0x11
Feb 5 03:15:19 kaoz [ 1953.635068] kdeinit4 D ffff88007c760870 0 6084 1
Feb 5 03:15:19 kaoz [ 1953.635075] ffff88006e83bcf0 0000000000000086 ffffffff8026f77d 0000000000000000
Feb 5 03:15:19 kaoz [ 1953.635082] ffffffff805de000 ffff880070ae4440 ffff880070ae3330 ffff880070ae46a8
Feb 5 03:15:19 kaoz [ 1953.635089] 00000001805e19e0 ffffe20001a79688 ffff880070ae46a8 0000000000000000
Feb 5 03:15:19 kaoz [ 1953.635095] Call Trace:
Feb 5 03:15:19 kaoz [ 1953.635103] [<ffffffff8026f77d>] find_get_page+0x8d/0xc0
Feb 5 03:15:19 kaoz [ 1953.635109] [<ffffffff80475a55>] __mutex_lock_slowpath+0x75/0xc0
Feb 5 03:15:19 kaoz [ 1953.635114] [<ffffffff8047588a>] mutex_lock+0xa/0x10
Feb 5 03:15:19 kaoz [ 1953.635119] [<ffffffff80271b1f>] generic_file_aio_write+0x4f/0xe0
Feb 5 03:15:19 kaoz [ 1953.635126] [<ffffffff802f6848>] ext4_file_write+0x58/0x170
Feb 5 03:15:19 kaoz [ 1953.635134] [<ffffffff8029f66b>] do_sync_write+0xdb/0x120
Feb 5 03:15:19 kaoz [ 1953.635142] [<ffffffff80227210>] do_page_fault+0x300/0x970
Feb 5 03:15:19 kaoz [ 1953.635148] [<ffffffff80251d20>] autoremove_wake_function+0x0/0x30
Feb 5 03:15:19 kaoz [ 1953.635155] [<ffffffff802a008b>] vfs_write+0xcb/0x170
Feb 5 03:15:19 kaoz [ 1953.635161] [<ffffffff802a0233>] sys_write+0x53/0xa0
Feb 5 03:15:19 kaoz [ 1953.635166] [<ffffffff8020b8cb>] system_call_fastpath+0x16/0x1b
Feb 5 03:15:19 kaoz [ 1953.635173] quasselcore D ffff880001006b08 0 6204 1
Feb 5 03:15:19 kaoz [ 1953.635179] ffff88006ae09bb8 0000000000000086 ffff88007e91d800 ffffffff80496fd0
Feb 5 03:15:19 kaoz [ 1953.635186] ffffffff805de000 ffff88006ad685b0 ffff880055a605b0 ffff88006ad68818
Feb 5 03:15:19 kaoz [ 1953.635192] 0000000100000004 0000000000000000 ffff88006ad68818 ffffffff802fa711
Feb 5 03:15:19 kaoz [ 1953.635199] Call Trace:
Feb 5 03:15:19 kaoz [ 1953.635205] [<ffffffff802fa711>] ext4_da_write_end+0x141/0x280
Feb 5 03:15:19 kaoz [ 1953.635259] [<ffffffffa008c6cc>] dm_table_unplug_all+0x3c/0x90 [dm_mod]
Feb 5 03:15:19 kaoz [ 1953.635266] [<ffffffff8026f910>] sync_page+0x0/0x70
Feb 5 03:15:19 kaoz [ 1953.635273] [<ffffffff80475307>] io_schedule+0x37/0x50
Feb 5 03:15:19 kaoz [ 1953.635279] [<ffffffff8026f945>] sync_page+0x35/0x70
Feb 5 03:15:19 kaoz [ 1953.635283] [<ffffffff8047568a>] __wait_on_bit_lock+0x4a/0x80
Feb 5 03:15:19 kaoz [ 1953.635289] [<ffffffff8026f8ee>] __lock_page+0x5e/0x70
Feb 5 03:15:19 kaoz [ 1953.635295] [<ffffffff80251d50>] wake_bit_function+0x0/0x30
Feb 5 03:15:19 kaoz [ 1953.635302] [<ffffffff80276cdd>] write_cache_pages+0x1ed/0x3d0
Feb 5 03:15:19 kaoz [ 1953.635308] [<ffffffff802fbf10>] __mpage_da_writepage+0x0/0x170
Feb 5 03:15:19 kaoz [ 1953.635315] [<ffffffff802fbcc7>] ext4_da_writepages+0x237/0x3b0
Feb 5 03:15:19 kaoz [ 1953.635321] [<ffffffff80251d20>] autoremove_wake_function+0x0/0x30
Feb 5 03:15:19 kaoz [ 1953.635328] [<ffffffff802fd240>] ext4_da_get_block_write+0x0/0x160
Feb 5 03:15:19 kaoz [ 1953.635333] [<ffffffff80276f10>] do_writepages+0x20/0x40
Feb 5 03:15:19 kaoz [ 1953.635338] [<ffffffff8027074d>] __filemap_fdatawrite_range+0x4d/0x60
Feb 5 03:15:19 kaoz [ 1953.635345] [<ffffffff802c12b5>] do_fsync+0x45/0xe0
Feb 5 03:15:19 kaoz [ 1953.635350] [<ffffffff802c137e>] __do_fsync+0x2e/0x50
Feb 5 03:15:19 kaoz [ 1953.635355] [<ffffffff8020b8cb>] system_call_fastpath+0x16/0x1b
Feb 5 03:15:19 kaoz [ 1953.635361] kwin D ffff88007c760870 0 6307 6283
Feb 5 03:15:19 kaoz [ 1953.635366] ffff88006af0fcf0 0000000000000082 ffffffff8026f77d 0000000000000000
Feb 5 03:15:19 kaoz [ 1953.635373] ffffffff805de000 ffff88007e7ea7d0 ffff8800709d96c0 ffff88007e7eaa38
Feb 5 03:15:19 kaoz [ 1953.635380] 00000000805e19e0 ffffe20000664a20 ffff88007e7eaa38 ffff88006af0fcc8
Feb 5 03:15:19 kaoz [ 1953.635386] Call Trace:
Feb 5 03:15:19 kaoz [ 1953.635392] [<ffffffff8026f77d>] find_get_page+0x8d/0xc0
Feb 5 03:15:19 kaoz [ 1953.635398] [<ffffffff8022f753>] __wake_up+0x43/0x70
Feb 5 03:15:19 kaoz [ 1953.635403] [<ffffffff80475a55>] __mutex_lock_slowpath+0x75/0xc0
Feb 5 03:15:19 kaoz [ 1953.635408] [<ffffffff8047588a>] mutex_lock+0xa/0x10
Feb 5 03:15:19 kaoz [ 1953.635413] [<ffffffff80271b1f>] generic_file_aio_write+0x4f/0xe0
Feb 5 03:15:19 kaoz [ 1953.635419] [<ffffffff802f6848>] ext4_file_write+0x58/0x170
Feb 5 03:15:19 kaoz [ 1953.635425] [<ffffffff8029f66b>] do_sync_write+0xdb/0x120
Feb 5 03:15:19 kaoz [ 1953.635431] [<ffffffff80227210>] do_page_fault+0x300/0x970
Feb 5 03:15:19 kaoz [ 1953.635437] [<ffffffff80251d20>] autoremove_wake_function+0x0/0x30
Feb 5 03:15:19 kaoz [ 1953.635443] [<ffffffff803fc4d6>] sock_ioctl+0x56/0x260
Feb 5 03:15:19 kaoz [ 1953.635450] [<ffffffff802ad76f>] vfs_ioctl+0x2f/0xa0
Feb 5 03:15:19 kaoz [ 1953.635456] [<ffffffff802a008b>] vfs_write+0xcb/0x170
Feb 5 03:15:19 kaoz [ 1953.635462] [<ffffffff802a0233>] sys_write+0x53/0xa0
Feb 5 03:15:19 kaoz [ 1953.635467] [<ffffffff8020b8cb>] system_call_fastpath+0x16/0x1b
Feb 5 03:15:19 kaoz [ 1953.635479] mysqld D 0000000000000002 0 6688 6674
Feb 5 03:15:19 kaoz [ 1953.635485] ffff88005c58db58 0000000000000086 ffff88005c58dad8 ffffffff80230285
Feb 5 03:15:19 kaoz [ 1953.635491] ffffffff805de000 ffff88007f95ec10 ffff8800636ca7d0 ffff88007f95ee78
Feb 5 03:15:19 kaoz [ 1953.635498] 0000000100000001 ffff880070bdd840 ffff88007f95ee78 ffffffff8023384b
Feb 5 03:15:19 kaoz [ 1953.635504] Call Trace:
Feb 5 03:15:19 kaoz [ 1953.635510] [<ffffffff80230285>] enqueue_entity+0xf5/0x160
Feb 5 03:15:19 kaoz [ 1953.635517] [<ffffffff8023384b>] check_preempt_wakeup+0x15b/0x180
Feb 5 03:15:19 kaoz [ 1953.635522] [<ffffffff802356ae>] try_to_wake_up+0xee/0x1a0
Feb 5 03:15:19 kaoz [ 1953.635528] [<ffffffff8031cf3b>] start_this_handle+0x33b/0x450
Feb 5 03:15:19 kaoz [ 1953.635534] [<ffffffff80251d20>] autoremove_wake_function+0x0/0x30
Feb 5 03:15:19 kaoz [ 1953.635541] [<ffffffff8031d226>] jbd2_journal_start+0x96/0xe0
Feb 5 03:15:19 kaoz [ 1953.635547] [<ffffffff802f9c36>] ext4_dirty_inode+0x36/0xb0
Feb 5 03:15:19 kaoz [ 1953.635552] [<ffffffff802be284>] __mark_inode_dirty+0x34/0x1d0
Feb 5 03:15:19 kaoz [ 1953.635558] [<ffffffff802b3380>] file_update_time+0x110/0x130
Feb 5 03:15:19 kaoz [ 1953.635564] [<ffffffff80270fa6>] __generic_file_aio_write_nolock+0x246/0x470
Feb 5 03:15:19 kaoz [ 1953.635569] [<ffffffff80271b34>] generic_file_aio_write+0x64/0xe0
Feb 5 03:15:19 kaoz [ 1953.635575] [<ffffffff802f6848>] ext4_file_write+0x58/0x170
Feb 5 03:15:19 kaoz [ 1953.635582] [<ffffffff8029f66b>] do_sync_write+0xdb/0x120
Feb 5 03:15:19 kaoz [ 1953.635588] [<ffffffff80227210>] do_page_fault+0x300/0x970
Feb 5 03:15:19 kaoz [ 1953.635594] [<ffffffff80251d20>] autoremove_wake_function+0x0/0x30
Feb 5 03:15:19 kaoz [ 1953.635600] [<ffffffff802a008b>] vfs_write+0xcb/0x170
Feb 5 03:15:19 kaoz [ 1953.635606] [<ffffffff802a0233>] sys_write+0x53/0xa0
Feb 5 03:15:19 kaoz [ 1953.635611] [<ffffffff8020b8cb>] system_call_fastpath+0x16/0x1b
Feb 5 03:15:19 kaoz [ 1953.635616] konsole D ffff88007c760870 0 6722 1
Feb 5 03:15:19 kaoz [ 1953.635622] ffff88006ae49cf0 0000000000000082 ffffffff8026f77d 0000000000000000
Feb 5 03:15:19 kaoz [ 1953.635628] ffffffff805de000 ffff88005c594fa0 ffff88007c0b2220 ffff88005c595208
Feb 5 03:15:19 kaoz [ 1953.635635] 00000001805e19e0 ffffe20001a79688 ffff88005c595208 0000000000000000
Feb 5 03:15:19 kaoz [ 1953.635641] Call Trace:
Feb 5 03:15:19 kaoz [ 1953.635647] [<ffffffff8026f77d>] find_get_page+0x8d/0xc0
Feb 5 03:15:19 kaoz [ 1953.635652] [<ffffffff80475a55>] __mutex_lock_slowpath+0x75/0xc0
Feb 5 03:15:19 kaoz [ 1953.635657] [<ffffffff8047588a>] mutex_lock+0xa/0x10
Feb 5 03:15:19 kaoz [ 1953.635662] [<ffffffff80271b1f>] generic_file_aio_write+0x4f/0xe0
Feb 5 03:15:19 kaoz [ 1953.635668] [<ffffffff802f6848>] ext4_file_write+0x58/0x170
Feb 5 03:15:19 kaoz [ 1953.635674] [<ffffffff8029f66b>] do_sync_write+0xdb/0x120
Feb 5 03:15:19 kaoz [ 1953.635680] [<ffffffff80227210>] do_page_fault+0x300/0x970
Feb 5 03:15:19 kaoz [ 1953.635686] [<ffffffff80251d20>] autoremove_wake_function+0x0/0x30
Feb 5 03:15:19 kaoz [ 1953.635692] [<ffffffff802ad76f>] vfs_ioctl+0x2f/0xa0
Feb 5 03:15:19 kaoz [ 1953.635698] [<ffffffff802a008b>] vfs_write+0xcb/0x170
Feb 5 03:15:19 kaoz [ 1953.635704] [<ffffffff802a0233>] sys_write+0x53/0xa0
Feb 5 03:15:19 kaoz [ 1953.635709] [<ffffffff8020b8cb>] system_call_fastpath+0x16/0x1b
Feb 5 03:15:19 kaoz [ 1953.635715] pdflush D ffff880001003178 0 7292 2
Feb 5 03:15:19 kaoz [ 1953.635720] ffff88007c09ba20 0000000000000046 ffff880024e2b870 ffff88007ebd32d0
Feb 5 03:15:19 kaoz [ 1953.635727] ffffffff805de000 ffff880055a638e0 ffff88007ea7c9f0 ffff880055a63b48
Feb 5 03:15:19 kaoz [ 1953.635734] 000000017c09b9c0 ffff880024e2b870 ffff880055a63b48 ffff88007edd1d80
Feb 5 03:15:19 kaoz [ 1953.635740] Call Trace:
Feb 5 03:15:19 kaoz [ 1953.635746] [<ffffffff8032f437>] generic_make_request+0x207/0x340
Feb 5 03:15:19 kaoz [ 1953.635767] [<ffffffffa008c6cc>] dm_table_unplug_all+0x3c/0x90 [dm_mod]
Feb 5 03:15:19 kaoz [ 1953.635775] [<ffffffff80341b27>] radix_tree_gang_lookup_slot+0x77/0xc0
Feb 5 03:15:19 kaoz [ 1953.635781] [<ffffffff8026f910>] sync_page+0x0/0x70
Feb 5 03:15:19 kaoz [ 1953.635788] [<ffffffff80475307>] io_schedule+0x37/0x50
Feb 5 03:15:19 kaoz [ 1953.635794] [<ffffffff8026f945>] sync_page+0x35/0x70
Feb 5 03:15:19 kaoz [ 1953.635798] [<ffffffff8047568a>] __wait_on_bit_lock+0x4a/0x80
Feb 5 03:15:19 kaoz [ 1953.635805] [<ffffffff8026f8ee>] __lock_page+0x5e/0x70
Feb 5 03:15:19 kaoz [ 1953.635810] [<ffffffff80251d50>] wake_bit_function+0x0/0x30
Feb 5 03:15:19 kaoz [ 1953.635816] [<ffffffff8027867a>] pagevec_lookup_tag+0x1a/0x30
Feb 5 03:15:19 kaoz [ 1953.635822] [<ffffffff80276cdd>] write_cache_pages+0x1ed/0x3d0
Feb 5 03:15:19 kaoz [ 1953.635828] [<ffffffff802fbf10>] __mpage_da_writepage+0x0/0x170
Feb 5 03:15:19 kaoz [ 1953.635835] [<ffffffff8031bbdf>] jbd2_journal_stop+0x17f/0x200
Feb 5 03:15:19 kaoz [ 1953.635842] [<ffffffff802fbcc7>] ext4_da_writepages+0x237/0x3b0
Feb 5 03:15:19 kaoz [ 1953.635848] [<ffffffff80476f6c>] _spin_unlock_irq+0xc/0x30
Feb 5 03:15:19 kaoz [ 1953.635853] [<ffffffff80236c8b>] finish_task_switch+0x2b/0xe0
Feb 5 03:15:19 kaoz [ 1953.635860] [<ffffffff802fd240>] ext4_da_get_block_write+0x0/0x160
Feb 5 03:15:19 kaoz [ 1953.635865] [<ffffffff80276f10>] do_writepages+0x20/0x40
Feb 5 03:15:19 kaoz [ 1953.635871] [<ffffffff802bd516>] __writeback_single_inode+0xa6/0x470
Feb 5 03:15:19 kaoz [ 1953.635876] [<ffffffff802bdea0>] generic_sync_sb_inodes+0x370/0x4d0
Feb 5 03:15:19 kaoz [ 1953.635882] [<ffffffff802be1bd>] writeback_inodes+0x4d/0xe0
Feb 5 03:15:19 kaoz [ 1953.635887] [<ffffffff8027759d>] background_writeout+0xad/0xe0
Feb 5 03:15:19 kaoz [ 1953.635893] [<ffffffff80277ccb>] pdflush+0x15b/0x240
Feb 5 03:15:19 kaoz [ 1953.635898] [<ffffffff802774f0>] background_writeout+0x0/0xe0
Feb 5 03:15:19 kaoz [ 1953.635904] [<ffffffff80277b70>] pdflush+0x0/0x240
Feb 5 03:15:19 kaoz [ 1953.635909] [<ffffffff80251957>] kthread+0x47/0x80
Feb 5 03:15:19 kaoz [ 1953.635914] [<ffffffff80238697>] schedule_tail+0x27/0x70
Feb 5 03:15:19 kaoz [ 1953.635919] [<ffffffff8020c7e9>] child_rip+0xa/0x11
Feb 5 03:15:19 kaoz [ 1953.635924] [<ffffffff80251910>] kthread+0x0/0x80
Feb 5 03:15:19 kaoz [ 1953.635929] [<ffffffff8020c7df>] child_rip+0x0/0x11
Feb 5 03:15:19 kaoz [ 1953.635932] krunner_lock D ffff88007c760870 0 7306 6670
Feb 5 03:15:19 kaoz [ 1953.635938] ffff880063e77cf0 0000000000000082 ffffffff8026f77d 0000000000000000
Feb 5 03:15:19 kaoz [ 1953.635945] ffffffff805de000 ffff88000395b330 ffff880055a63e90 ffff88000395b598
Feb 5 03:15:19 kaoz [ 1953.635952] 00000001805e19e0 ffffe200000b0d88 ffff88000395b598 0000000000000086
Feb 5 03:15:19 kaoz [ 1953.635958] Call Trace:
Feb 5 03:15:19 kaoz [ 1953.635964] [<ffffffff8026f77d>] find_get_page+0x8d/0xc0
Feb 5 03:15:19 kaoz [ 1953.635969] [<ffffffff80475a55>] __mutex_lock_slowpath+0x75/0xc0
Feb 5 03:15:19 kaoz [ 1953.635974] [<ffffffff8047588a>] mutex_lock+0xa/0x10
Feb 5 03:15:19 kaoz [ 1953.635979] [<ffffffff80271b1f>] generic_file_aio_write+0x4f/0xe0
Feb 5 03:15:19 kaoz [ 1953.635985] [<ffffffff802f6848>] ext4_file_write+0x58/0x170
Feb 5 03:15:19 kaoz [ 1953.635991] [<ffffffff8029f66b>] do_sync_write+0xdb/0x120
Feb 5 03:15:19 kaoz [ 1953.635997] [<ffffffff80227210>] do_page_fault+0x300/0x970
Feb 5 03:15:19 kaoz [ 1953.636003] [<ffffffff80251d20>] autoremove_wake_function+0x0/0x30
Feb 5 03:15:19 kaoz [ 1953.636010] [<ffffffff802493af>] kill_pid_info+0x4f/0x80
Feb 5 03:15:19 kaoz [ 1953.636016] [<ffffffff802a008b>] vfs_write+0xcb/0x170
Feb 5 03:15:19 kaoz [ 1953.636022] [<ffffffff802a0233>] sys_write+0x53/0xa0
Feb 5 03:15:19 kaoz [ 1953.636027] [<ffffffff8020b8cb>] system_call_fastpath+0x16/0x1b
Feb 5 03:15:19 kaoz [ 1953.636031] krunner_lock D ffff88007c760870 0 7307 7306
Feb 5 03:15:19 kaoz [ 1953.636037] ffff88006364bcf0 0000000000000082 ffffe200000b0d88 ffffffff805e19e0
Feb 5 03:15:19 kaoz [ 1953.636044] ffffffff805de000 ffff880055a63e90 ffff88007c0b2220 ffff880055a640f8
Feb 5 03:15:19 kaoz [ 1953.636050] 00000001802791f5 ffffe200000b0d88 ffff880055a640f8 0000000000000000
Feb 5 03:15:19 kaoz [ 1953.636057] Call Trace:
Feb 5 03:15:19 kaoz [ 1953.636062] [<ffffffff80475a55>] __mutex_lock_slowpath+0x75/0xc0
Feb 5 03:15:19 kaoz [ 1953.636066] [<ffffffff8047588a>] mutex_lock+0xa/0x10
Feb 5 03:15:19 kaoz [ 1953.636071] [<ffffffff80271b1f>] generic_file_aio_write+0x4f/0xe0
Feb 5 03:15:19 kaoz [ 1953.636077] [<ffffffff802f6848>] ext4_file_write+0x58/0x170
Feb 5 03:15:19 kaoz [ 1953.636084] [<ffffffff8029f66b>] do_sync_write+0xdb/0x120
Feb 5 03:15:19 kaoz [ 1953.636090] [<ffffffff80227210>] do_page_fault+0x300/0x970
Feb 5 03:15:19 kaoz [ 1953.636095] [<ffffffff80251d20>] autoremove_wake_function+0x0/0x30
Feb 5 03:15:19 kaoz [ 1953.636101] [<ffffffff802493af>] kill_pid_info+0x4f/0x80
Feb 5 03:15:19 kaoz [ 1953.636108] [<ffffffff802a008b>] vfs_write+0xcb/0x170
Feb 5 03:15:19 kaoz [ 1953.636113] [<ffffffff802a0233>] sys_write+0x53/0xa0
Feb 5 03:15:19 kaoz [ 1953.636119] [<ffffffff8020b8cb>] system_call_fastpath+0x16/0x1b
Feb 5 03:15:19 kaoz [ 1953.636122] kblankscrn.ks D ffff880001020c20 0 7309 7306
Feb 5 03:15:19 kaoz [ 1953.636128] ffff8800635e3cf0 0000000000000086 ffffffff8026f77d 0000000000000000
Feb 5 03:15:19 kaoz [ 1953.636135] ffffffff805de000 ffff8800039585b0 ffff88007f862220 ffff880003958818
Feb 5 03:15:19 kaoz [ 1953.636141] 00000001805e19e0 000000010005efb2 ffff880003958818 ffffffff8056ffc8
Feb 5 03:15:19 kaoz [ 1953.636148] Call Trace:
Feb 5 03:15:19 kaoz [ 1953.636154] [<ffffffff8026f77d>] find_get_page+0x8d/0xc0
Feb 5 03:15:19 kaoz [ 1953.636159] [<ffffffff80475a55>] __mutex_lock_slowpath+0x75/0xc0
Feb 5 03:15:19 kaoz [ 1953.636164] [<ffffffff8047588a>] mutex_lock+0xa/0x10
Feb 5 03:15:19 kaoz [ 1953.636169] [<ffffffff80271b1f>] generic_file_aio_write+0x4f/0xe0
Feb 5 03:15:19 kaoz [ 1953.636175] [<ffffffff802f6848>] ext4_file_write+0x58/0x170
Feb 5 03:15:19 kaoz [ 1953.636181] [<ffffffff8029f66b>] do_sync_write+0xdb/0x120
Feb 5 03:15:19 kaoz [ 1953.636187] [<ffffffff80227210>] do_page_fault+0x300/0x970
Feb 5 03:15:19 kaoz [ 1953.636193] [<ffffffff80251d20>] autoremove_wake_function+0x0/0x30
Feb 5 03:15:19 kaoz [ 1953.636200] [<ffffffff802866e6>] unmap_region+0x106/0x1a0
Feb 5 03:15:19 kaoz [ 1953.636206] [<ffffffff802a008b>] vfs_write+0xcb/0x170
Feb 5 03:15:19 kaoz [ 1953.636212] [<ffffffff802a0233>] sys_write+0x53/0xa0
Feb 5 03:15:19 kaoz [ 1953.636217] [<ffffffff8020b8cb>] system_call_fastpath+0x16/0x1b
Feb 5 03:15:19 kaoz [ 1953.636221] kblankscrn.ks D 0000000000000002 0 7311 7307
Feb 5 03:15:19 kaoz [ 1953.636227] ffff880042a2bb58 0000000000000086 ffff880024edb150 0000000000b29b6f
Feb 5 03:15:19 kaoz [ 1953.636233] ffffffff805de000 ffff88000395b8e0 ffff8800039585b0 ffff88000395bb48
Feb 5 03:15:19 kaoz [ 1953.636240] 000000010395b8e0 000300018022f9c8 ffff88000395bb48 ffff880070bdd900
Feb 5 03:15:19 kaoz [ 1953.636246] Call Trace:
Feb 5 03:15:19 kaoz [ 1953.636252] [<ffffffff8022f928>] set_next_entity+0x38/0x80
Feb 5 03:15:19 kaoz [ 1953.636259] [<ffffffff8031cf3b>] start_this_handle+0x33b/0x450
Feb 5 03:15:19 kaoz [ 1953.636265] [<ffffffff80251d20>] autoremove_wake_function+0x0/0x30
Feb 5 03:15:19 kaoz [ 1953.636271] [<ffffffff8031d226>] jbd2_journal_start+0x96/0xe0
Feb 5 03:15:19 kaoz [ 1953.636277] [<ffffffff802f9c36>] ext4_dirty_inode+0x36/0xb0
Feb 5 03:15:19 kaoz [ 1953.636282] [<ffffffff802be284>] __mark_inode_dirty+0x34/0x1d0
Feb 5 03:15:19 kaoz [ 1953.636288] [<ffffffff802b3380>] file_update_time+0x110/0x130
Feb 5 03:15:19 kaoz [ 1953.636293] [<ffffffff80270fa6>] __generic_file_aio_write_nolock+0x246/0x470
Feb 5 03:15:19 kaoz [ 1953.636299] [<ffffffff80280332>] __do_fault+0x202/0x4c0
Feb 5 03:15:19 kaoz [ 1953.636304] [<ffffffff80271b34>] generic_file_aio_write+0x64/0xe0
Feb 5 03:15:19 kaoz [ 1953.636310] [<ffffffff802f6848>] ext4_file_write+0x58/0x170
Feb 5 03:15:19 kaoz [ 1953.636316] [<ffffffff8029f66b>] do_sync_write+0xdb/0x120
Feb 5 03:15:19 kaoz [ 1953.636322] [<ffffffff80227210>] do_page_fault+0x300/0x970
Feb 5 03:15:19 kaoz [ 1953.636328] [<ffffffff80251d20>] autoremove_wake_function+0x0/0x30
Feb 5 03:15:19 kaoz [ 1953.636333] [<ffffffff802866e6>] unmap_region+0x106/0x1a0
Feb 5 03:15:19 kaoz [ 1953.636340] [<ffffffff802a008b>] vfs_write+0xcb/0x170
Feb 5 03:15:19 kaoz [ 1953.636346] [<ffffffff802a0233>] sys_write+0x53/0xa0
Feb 5 03:15:19 kaoz [ 1953.636351] [<ffffffff8020b8cb>] system_call_fastpath+0x16/0x1b
Feb 5 03:15:19 kaoz [ 1953.636355] updatedb D ffff880001020c20 0 7511 7506
Feb 5 03:15:19 kaoz [ 1953.636361] ffff8800372fdbf8 0000000000000086 ffff88007ea30000 0000000000000000
Feb 5 03:15:19 kaoz [ 1953.636367] ffffffff805de000 ffff88000395e660 ffff88007f862220 ffff88000395e8c8
Feb 5 03:15:19 kaoz [ 1953.636374] 000000017fa93a50 00000001000791d8 ffff88000395e8c8 ffff88007eb544f0
Feb 5 03:15:19 kaoz [ 1953.636381] Call Trace:
Feb 5 03:15:19 kaoz [ 1953.636386] [<ffffffff802c3880>] sync_buffer+0x0/0x50
Feb 5 03:15:19 kaoz [ 1953.636392] [<ffffffff80330564>] generic_unplug_device+0x24/0x40
Feb 5 03:15:19 kaoz [ 1953.636412] [<ffffffffa008c6cc>] dm_table_unplug_all+0x3c/0x90 [dm_mod]
Feb 5 03:15:19 kaoz [ 1953.636418] [<ffffffff802c3880>] sync_buffer+0x0/0x50
Feb 5 03:15:19 kaoz [ 1953.636424] [<ffffffff80475307>] io_schedule+0x37/0x50
Feb 5 03:15:19 kaoz [ 1953.636429] [<ffffffff802c38bd>] sync_buffer+0x3d/0x50
Feb 5 03:15:19 kaoz [ 1953.636433] [<ffffffff804757b0>] __wait_on_bit+0x50/0x80
Feb 5 03:15:19 kaoz [ 1953.636439] [<ffffffff802c3880>] sync_buffer+0x0/0x50
Feb 5 03:15:19 kaoz [ 1953.636444] [<ffffffff80475859>] out_of_line_wait_on_bit+0x79/0xa0
Feb 5 03:15:19 kaoz [ 1953.636449] [<ffffffff80251d50>] wake_bit_function+0x0/0x30
Feb 5 03:15:19 kaoz [ 1953.636455] [<ffffffff802fd5ba>] ext4_bread+0x5a/0x80
Feb 5 03:15:19 kaoz [ 1953.636461] [<ffffffff803032b3>] htree_dirblock_to_tree+0x33/0x1b0
Feb 5 03:15:19 kaoz [ 1953.636466] [<ffffffff803035a2>] ext4_htree_fill_tree+0x172/0x210
Feb 5 03:15:19 kaoz [ 1953.636472] [<ffffffff802aaf4e>] do_path_lookup+0x9e/0x1b0
Feb 5 03:15:19 kaoz [ 1953.636477] [<ffffffff802a0805>] file_move+0x25/0x70
Feb 5 03:15:19 kaoz [ 1953.636483] [<ffffffff802f6492>] ext4_readdir+0x4a2/0x600
Feb 5 03:15:19 kaoz [ 1953.636489] [<ffffffff802ae0b0>] filldir+0x0/0xe0
Feb 5 03:15:19 kaoz [ 1953.636494] [<ffffffff8029829f>] add_partial+0x1f/0x80
Feb 5 03:15:19 kaoz [ 1953.636500] [<ffffffff802a34c4>] cp_new_stat+0xe4/0x100
Feb 5 03:15:19 kaoz [ 1953.636506] [<ffffffff802ae0b0>] filldir+0x0/0xe0
Feb 5 03:15:19 kaoz [ 1953.636511] [<ffffffff802ae320>] vfs_readdir+0xb0/0xd0
Feb 5 03:15:19 kaoz [ 1953.636518] [<ffffffff802ae4b4>] sys_getdents+0x84/0xe0
Feb 5 03:15:19 kaoz [ 1953.636524] [<ffffffff8029e6ca>] sys_fchdir+0x4a/0x90
Feb 5 03:15:19 kaoz [ 1953.636529] [<ffffffff8020b8cb>] system_call_fastpath+0x16/0x1b
--
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