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From: John Hughes on 3 Mar 2010 06:40
Andrew Morton wrote:
> When the system is stuck, please run
>
> echo w > /proc/sysrq-trigger
>
Ok, we have:

[ 1128.964403] kjournald D 0000000000000000 0 2196 2 0x00000000
[ 1128.964407] ffffffff8144b1f0 0000000000000046 0000000000000000 ffffffff811837bb
[ 1128.964409] ffff88063d1762e0 ffff880340002c80 000000000000f8a0 ffff88063c6e9fd8
[ 1128.964412] 00000000000155c0 00000000000155c0 ffff88063d1762e0 ffff88063d1765d8
[ 1128.964415] Call Trace:
[ 1128.964423] [<ffffffff811837bb>] ? cfq_set_request+0x2af/0x319
[ 1128.964427] [<ffffffff811780d7>] ? get_request+0x7e/0x2ba
[ 1128.964431] [<ffffffff812edf36>] ? io_schedule+0x73/0xb7
[ 1128.964433] [<ffffffff81178403>] ? get_request_wait+0xf0/0x188
[ 1128.964437] [<ffffffff81064a56>] ? autoremove_wake_function+0x0/0x2e
[ 1128.964441] [<ffffffff8117b28d>] ? blk_recount_segments+0x17/0x27
[ 1128.964443] [<ffffffff81178792>] ? __make_request+0x2f7/0x428
[ 1128.964447] [<ffffffff81176f6f>] ? generic_make_request+0x299/0x2f9
[ 1128.964450] [<ffffffff811770a5>] ? submit_bio+0xd6/0xf2
[ 1128.964455] [<ffffffff8110b50b>] ? submit_bh+0xf5/0x115
[ 1128.964463] [<ffffffffa017f5a2>] ? journal_commit_transaction+0x8d9/0xe2b [jbd]
[ 1128.964467] [<ffffffffa01823fb>] ? kjournald+0xdf/0x226 [jbd]
[ 1128.964469] [<ffffffff81064a56>] ? autoremove_wake_function+0x0/0x2e
[ 1128.964472] [<ffffffffa018231c>] ? kjournald+0x0/0x226 [jbd]
[ 1128.964474] [<ffffffff81064789>] ? kthread+0x79/0x81
[ 1128.964479] [<ffffffff81011baa>] ? child_rip+0xa/0x20
[ 1128.964481] [<ffffffff81064710>] ? kthread+0x0/0x81
[ 1128.964483] [<ffffffff81011ba0>] ? child_rip+0x0/0x20

And three of (flush-8:32, flush-8:48 and flush-8:64):

[ 1128.964485] flush-8:32 D 0000000000000000 0 2221 2 0x00000000
[ 1128.964488] ffff88033e44b880 0000000000000046 0000000000000000 ffffffff811837bb
[ 1128.964490] ffff88063d177100 0000001000022c80 000000000000f8a0 ffff88063b66dfd8
[ 1128.964493] 00000000000155c0 00000000000155c0 ffff88063d177100 ffff88063d1773f8
[ 1128.964495] Call Trace:
[ 1128.964497] [<ffffffff811837bb>] ? cfq_set_request+0x2af/0x319
[ 1128.964500] [<ffffffff811780d7>] ? get_request+0x7e/0x2ba
[ 1128.964502] [<ffffffff812edf36>] ? io_schedule+0x73/0xb7
[ 1128.964504] [<ffffffff81178403>] ? get_request_wait+0xf0/0x188
[ 1128.964506] [<ffffffff81064a56>] ? autoremove_wake_function+0x0/0x2e
[ 1128.964508] [<ffffffff81178792>] ? __make_request+0x2f7/0x428
[ 1128.964511] [<ffffffff81176f6f>] ? generic_make_request+0x299/0x2f9
[ 1128.964514] [<ffffffff810114ce>] ? common_interrupt+0xe/0x13
[ 1128.964516] [<ffffffff811770a5>] ? submit_bio+0xd6/0xf2
[ 1128.964518] [<ffffffff8110b50b>] ? submit_bh+0xf5/0x115
[ 1128.964522] [<ffffffff8110da7c>] ? __block_write_full_page+0x1d6/0x2ac
[ 1128.964525] [<ffffffff8110c801>] ? end_buffer_async_write+0x0/0x13b
[ 1128.964528] [<ffffffff8110fabc>] ? blkdev_get_block+0x0/0x57
[ 1128.964532] [<ffffffff810b9572>] ? __writepage+0xa/0x25
[ 1128.964534] [<ffffffff810b9bf9>] ? write_cache_pages+0x20b/0x327
[ 1128.964536] [<ffffffff810b9568>] ? __writepage+0x0/0x25
[ 1128.964541] [<ffffffff8110642e>] ? writeback_single_inode+0xe7/0x2da
[ 1128.964543] [<ffffffff81107107>] ? writeback_inodes_wb+0x423/0x4fe
[ 1128.964546] [<ffffffff8110730e>] ? wb_writeback+0x12c/0x1ab
[ 1128.964549] [<ffffffff81107574>] ? wb_do_writeback+0x145/0x15b
[ 1128.964551] [<ffffffff811075bb>] ? bdi_writeback_task+0x31/0x9d
[ 1128.964556] [<ffffffff810c7cc6>] ? bdi_start_fn+0x0/0xca
[ 1128.964558] [<ffffffff810c7d36>] ? bdi_start_fn+0x70/0xca
[ 1128.964560] [<ffffffff810c7cc6>] ? bdi_start_fn+0x0/0xca
[ 1128.964562] [<ffffffff81064789>] ? kthread+0x79/0x81
[ 1128.964564] [<ffffffff81011baa>] ? child_rip+0xa/0x20
[ 1128.964566] [<ffffffff81064710>] ? kthread+0x0/0x81
[ 1128.964568] [<ffffffff81011ba0>] ? child_rip+0x0/0x20


And a few copies of bonnie (14 in total):

Two like this:

[ 1128.964735] bonnie D 0000000000000000 0 2240 2236 0x00000000
[ 1128.964737] ffff88033e44b880 0000000000000086 0000000000000000 00000000000009ef
[ 1128.964740] ffff8802bac52000 0000000000430bf5 000000000000f8a0 ffff88033d031fd8
[ 1128.964743] 00000000000155c0 00000000000155c0 ffff88033d811c40 ffff88033d811f38
[ 1128.964745] Call Trace:
[ 1128.964747] [<ffffffff8110c637>] ? sync_buffer+0x0/0x40
[ 1128.964749] [<ffffffff812edf36>] ? io_schedule+0x73/0xb7
[ 1128.964752] [<ffffffff8110c672>] ? sync_buffer+0x3b/0x40
[ 1128.964754] [<ffffffff812ee339>] ? __wait_on_bit_lock+0x3f/0x84
[ 1128.964756] [<ffffffff8110c637>] ? sync_buffer+0x0/0x40
[ 1128.964758] [<ffffffff812ee3e9>] ? out_of_line_wait_on_bit_lock+0x6b/0x77
[ 1128.964760] [<ffffffff81064a84>] ? wake_bit_function+0x0/0x23
[ 1128.964764] [<ffffffffa017e068>] ? do_get_write_access+0x82/0x441 [jbd]
[ 1128.964766] [<ffffffff8110bbed>] ? __getblk+0x26/0x29a
[ 1128.964769] [<ffffffffa017e449>] ? journal_get_write_access+0x22/0x33 [jbd]
[ 1128.964774] [<ffffffffa01a040f>] ? __ext3_journal_get_write_access+0x1e/0x47 [ext3]
[ 1128.964778] [<ffffffffa019418e>] ? ext3_reserve_inode_write+0x3e/0x75 [ext3]
[ 1128.964782] [<ffffffffa0199d86>] ? ext3_orphan_add+0x94/0x15b [ext3]
[ 1128.964786] [<ffffffffa01941f8>] ? ext3_mark_inode_dirty+0x33/0x3c [ext3]
[ 1128.964790] [<ffffffffa019a6cb>] ? ext3_unlink+0x166/0x1b4 [ext3]
[ 1128.964793] [<ffffffff810f645d>] ? vfs_unlink+0x72/0xa6
[ 1128.964795] [<ffffffff810f7cb5>] ? do_unlinkat+0xad/0x134
[ 1128.964797] [<ffffffff810f9b11>] ? vfs_readdir+0x92/0xa7
[ 1128.964800] [<ffffffff810f9c9d>] ? sys_getdents+0xb9/0xc7
[ 1128.964803] [<ffffffff81010b42>] ? system_call_fastpath+0x16/0x1b

One like this:

[ 1128.964804] bonnie D 0000000000000000 0 2241 2236 0x00000000
[ 1128.964807] ffff88033e44b880 0000000000000082 0000000000000000 ffffffff810b90a9
[ 1128.964809] ffff880000022c80 0000000000000000 000000000000f8a0 ffff88033c3abfd8
[ 1128.964812] 00000000000155c0 00000000000155c0 ffff88033d813f90 ffff88033d814288
[ 1128.964814] Call Trace:
[ 1128.964816] [<ffffffff810b90a9>] ? __alloc_pages_nodemask+0x10f/0x5ce
[ 1128.964819] [<ffffffff81064977>] ? bit_waitqueue+0x10/0xa0
[ 1128.964822] [<ffffffffa017e212>] ? do_get_write_access+0x22c/0x441 [jbd]
[ 1128.964824] [<ffffffff81064a84>] ? wake_bit_function+0x0/0x23
[ 1128.964826] [<ffffffff8110bbed>] ? __getblk+0x26/0x29a
[ 1128.964829] [<ffffffff810170cd>] ? read_tsc+0xa/0x20
[ 1128.964832] [<ffffffffa017e449>] ? journal_get_write_access+0x22/0x33 [jbd]
[ 1128.964836] [<ffffffffa01a040f>] ? __ext3_journal_get_write_access+0x1e/0x47 [ext3]
[ 1128.964840] [<ffffffffa019418e>] ? ext3_reserve_inode_write+0x3e/0x75 [ext3]
[ 1128.964844] [<ffffffffa01941e6>] ? ext3_mark_inode_dirty+0x21/0x3c [ext3]
[ 1128.964847] [<ffffffffa019a6b4>] ? ext3_unlink+0x14f/0x1b4 [ext3]
[ 1128.964850] [<ffffffff810f645d>] ? vfs_unlink+0x72/0xa6
[ 1128.964852] [<ffffffff810f7cb5>] ? do_unlinkat+0xad/0x134
[ 1128.964854] [<ffffffff810f9b11>] ? vfs_readdir+0x92/0xa7
[ 1128.964856] [<ffffffff810f9c9d>] ? sys_getdents+0xb9/0xc7
[ 1128.964859] [<ffffffff81010b42>] ? system_call_fastpath+0x16/0x1b


One like this:

[ 1128.964955] bonnie D 0000000000000000 0 2244 2236 0x00000000
[ 1128.964958] ffffffff8144b1f0 0000000000000082 0000000000000000 ffffffff811837bb
[ 1128.964960] ffff88033d813170 00000010a00fc7ab 000000000000f8a0 ffff88033ceadfd8
[ 1128.964963] 00000000000155c0 00000000000155c0 ffff88033d813170 ffff88033d813468
[ 1128.964965] Call Trace:
[ 1128.964967] [<ffffffff811837bb>] ? cfq_set_request+0x2af/0x319
[ 1128.964969] [<ffffffff811780d7>] ? get_request+0x7e/0x2ba
[ 1128.964971] [<ffffffff812edf36>] ? io_schedule+0x73/0xb7
[ 1128.964973] [<ffffffff81178403>] ? get_request_wait+0xf0/0x188
[ 1128.964976] [<ffffffff81064a56>] ? autoremove_wake_function+0x0/0x2e
[ 1128.964978] [<ffffffff81178792>] ? __make_request+0x2f7/0x428
[ 1128.964980] [<ffffffff81176f6f>] ? generic_make_request+0x299/0x2f9
[ 1128.964983] [<ffffffff811770a5>] ? submit_bio+0xd6/0xf2
[ 1128.964985] [<ffffffff8110b50b>] ? submit_bh+0xf5/0x115
[ 1128.964987] [<ffffffff8110da7c>] ? __block_write_full_page+0x1d6/0x2ac
[ 1128.964990] [<ffffffff8110c801>] ? end_buffer_async_write+0x0/0x13b
[ 1128.964992] [<ffffffff8110fabc>] ? blkdev_get_block+0x0/0x57
[ 1128.964994] [<ffffffff810b9572>] ? __writepage+0xa/0x25
[ 1128.964997] [<ffffffff810b9bf9>] ? write_cache_pages+0x20b/0x327
[ 1128.964999] [<ffffffff810b9568>] ? __writepage+0x0/0x25
[ 1128.965003] [<ffffffff810b3cda>] ? __filemap_fdatawrite_range+0x4b/0x54
[ 1128.965007] [<ffffffffa019b5bb>] ? ext3_sync_fs+0x42/0x4b [ext3]
[ 1128.965009] [<ffffffff810b4998>] ? filemap_write_and_wait+0x17/0x32
[ 1128.965013] [<ffffffff8112d015>] ? sync_quota_sb+0x5d/0xf6
[ 1128.965015] [<ffffffff8110a38d>] ? __sync_filesystem+0x43/0x70
[ 1128.965017] [<ffffffff8110a454>] ? sync_filesystems+0x9a/0xe3
[ 1128.965019] [<ffffffff8110a4e2>] ? sys_sync+0x1c/0x2e
[ 1128.965021] [<ffffffff81010b42>] ? system_call_fastpath+0x16/0x1b

Seven bonnies like this:

[ 1128.965231] bonnie D 0000000000000000 0 2253 2236 0x00000000
[ 1128.965233] ffffffff8144b1f0 0000000000000082 0000000000000000 ffff88034ac155c0
[ 1128.965236] ffff88033ce7f700 ffffffff81047f43 000000000000f8a0 ffff88033c249fd8
[ 1128.965239] 00000000000155c0 00000000000155c0 ffff88033d814db0 ffff88033d8150a8
[ 1128.965241] Call Trace:
[ 1128.965243] [<ffffffff81047f43>] ? finish_task_switch+0x3a/0xa7
[ 1128.965246] [<ffffffff812ee653>] ? __mutex_lock_common+0x10b/0x17b
[ 1128.965248] [<ffffffff812ee77b>] ? mutex_lock+0x1a/0x31
[ 1128.965250] [<ffffffff8110a3cd>] ? sync_filesystems+0x13/0xe3
[ 1128.965252] [<ffffffff8110a4d8>] ? sys_sync+0x12/0x2e
[ 1128.965255] [<ffffffff81010b42>] ? system_call_fastpath+0x16/0x1b

And three bonnies like this:

[ 1128.965023] bonnie D 0000000000000000 0 2245 2236 0x00000000
[ 1128.965026] ffff88033e44b880 0000000000000082 0000000000000000 00000000000155c0
[ 1128.965028] 0000000000000005 00000000000155c0 000000000000f8a0 ffff88033cfc3fd8
[ 1128.965031] 00000000000155c0 00000000000155c0 ffff88033d817100 ffff88033d8173f8
[ 1128.965033] Call Trace:
[ 1128.965035] [<ffffffff812ee653>] ? __mutex_lock_common+0x10b/0x17b
[ 1128.965038] [<ffffffff8104a196>] ? try_to_wake_up+0x249/0x259
[ 1128.965040] [<ffffffff812ee77b>] ? mutex_lock+0x1a/0x31
[ 1128.965042] [<ffffffff8110a3cd>] ? sync_filesystems+0x13/0xe3
[ 1128.965044] [<ffffffff8110a4d8>] ? sys_sync+0x12/0x2e
[ 1128.965047] [<ffffffff81010b42>] ? system_call_fastpath+0x16/0x1b



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From: John Hughes on 3 Mar 2010 07:00
Jens Axboe wrote:
> Is IO still going on, or does it appear to be stuck? From the traces
> below, we have various procs caught in waiting for a request. So if
> things are totally stuck, it could be some race in there.
>
I see I/O happening on three or four of the disks.

Just a thought. What exactly is sync(2) supposed to do - block until
there are no more dirty pages, or block until all pages that were dirty
when the sync was done are clean? In other words is the problem simply
that pages are being dirtied faster than the sync is writing them out?
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From: John Hughes on 3 Mar 2010 07:10
Jens Axboe wrote:
> On Wed, Mar 03 2010, John Hughes wrote:
>
>> Just a thought. What exactly is sync(2) supposed to do - block until
>> there are no more dirty pages, or block until all pages that were dirty
>> when the sync was done are clean? In other words is the problem simply
>> that pages are being dirtied faster than the sync is writing them out?
>>
>
> Our sync is currently broken in that regard, since it'll wait for too
> long. We have a debated patch going, I have included it below. Any
> chance you could give it a whirl?
>
> The semantics of sync are supposed to be 'wait for dirty IO generated
> BEFORE this sync call'.
>
Ok, I will try this patch and get back to you.

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From: John Hughes on 3 Mar 2010 13:00
Jens Axboe wrote:
> Our sync is currently broken in that regard, since it'll wait for too
> long. We have a debated patch going, I have included it below. Any
> chance you could give it a whirl?
>
> The semantics of sync are supposed to be 'wait for dirty IO generated
> BEFORE this sync call'.
>
>
This patch doesn't seem to change things. It's a bit late here, I'll
check my results tomorrow.

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From: John Hughes on 4 Mar 2010 06:20
Jens Axboe wrote:
> Our sync is currently broken in that regard, since it'll wait for too
> long. We have a debated patch going, I have included it below. Any
> chance you could give it a whirl?
>
Ok, I confirm that this patch does not fix my problem.

I'll try the "simpler" patch.

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