Re: [BUG] fatal hang untarring 90GB file, possibly writeback related.

Colin Ian King
2011-04-28T14:58:32Z

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On Thu, 2011-04-28 at 16:33 +0200, Jan Kara wrote:
> On Thu 28-04-11 16:25:51, Jan Kara wrote:
> > On Thu 28-04-11 15:01:22, Colin Ian King wrote:
> > >
> > > > Could you post the soft lockups you're seeing?
> > >
> > > As requested, attached
> > Hum, what keeps puzzling me is that in all the cases of hangs I've seen
> > so far, we are stuck waiting for IO to finish for a long time - e.g. in the
> > traces below kjournald waits for PageWriteback bit to get cleared. Also we
> > are stuck waiting for page locks which might be because those pages are
> > being read in? All in all it seems that the IO is just incredibly slow.
> >
> > But it's not clear to me what pushes us into that situation (especially
> > since ext4 refuses to do any IO from ->writepage (i.e. kswapd) when the
> > underlying blocks are not already allocated.
> Hmm, maybe because the system is under memory pressure (and kswapd is not
> able to get rid of dirty pages), we page out clean pages. Thus also pages
> of executables which need to be paged in soon anyway thus putting heavy
> read load on the system which makes writes crawl? I'm not sure why
> compaction should make this any worse but maybe it can.
>
> James, Colin, can you capture output of 'vmstat 1' while you do the
> copying? Thanks.

Attached.

>
> Honza
>
> > [ 287.088371] INFO: task rs:main Q:Reg:749 blocked for more than 30 seconds.
> > [ 287.088374] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> > [ 287.088376] rs:main Q:Reg D 0000000000000000 0 749 1 0x00000000
> > [ 287.088381] ffff880072c17b68 0000000000000082 ffff880072c17fd8 ffff880072c16000
> > [ 287.088392] 0000000000013d00 ffff88003591b178 ffff880072c17fd8 0000000000013d00
> > [ 287.088396] ffffffff81a0b020 ffff88003591adc0 ffff88001fffc3e8 ffff88001fc13d00
> > [ 287.088400] Call Trace:
> > [ 287.088404] [<ffffffff8110c070>] ? sync_page+0x0/0x50
> > [ 287.088408] [<ffffffff815c0990>] io_schedule+0x70/0xc0
> > [ 287.088411] [<ffffffff8110c0b0>] sync_page+0x40/0x50
> > [ 287.088414] [<ffffffff815c130f>] __wait_on_bit+0x5f/0x90
> > [ 287.088418] [<ffffffff8110c278>] wait_on_page_bit+0x78/0x80
> > [ 287.088421] [<ffffffff81087f70>] ? wake_bit_function+0x0/0x50
> > [ 287.088425] [<ffffffff8110dffd>] __lock_page_or_retry+0x3d/0x70
> > [ 287.088428] [<ffffffff8110e3c7>] filemap_fault+0x397/0x4a0
> > [ 287.088431] [<ffffffff8112d144>] __do_fault+0x54/0x520
> > [ 287.088434] [<ffffffff81134a43>] ? unmap_region+0x113/0x170
> > [ 287.088437] [<ffffffff812ded90>] ? prio_tree_insert+0x150/0x1c0
> > [ 287.088440] [<ffffffff811309da>] handle_pte_fault+0xfa/0x210
> > [ 287.088442] [<ffffffff810442a7>] ? pte_alloc_one+0x37/0x50
> > [ 287.088446] [<ffffffff815c2cce>] ? _raw_spin_lock+0xe/0x20
> > [ 287.088448] [<ffffffff8112de25>] ? __pte_alloc+0xb5/0x100
> > [ 287.088451] [<ffffffff81131d5d>] handle_mm_fault+0x16d/0x250
> > [ 287.088454] [<ffffffff815c6a47>] do_page_fault+0x1a7/0x540
> > [ 287.088457] [<ffffffff81136f85>] ? do_mmap_pgoff+0x335/0x370
> > [ 287.088460] [<ffffffff81137127>] ? sys_mmap_pgoff+0x167/0x230
> > [ 287.088463] [<ffffffff815c34d5>] page_fault+0x25/0x30
> > [ 287.088466] INFO: task NetworkManager:764 blocked for more than 30 seconds.
> > [ 287.088468] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> > [ 287.088470] NetworkManager D 0000000000000002 0 764 1 0x00000000
> > [ 287.088473] ffff880074ffbb68 0000000000000082 ffff880074ffbfd8 ffff880074ffa000
> > [ 287.088477] 0000000000013d00 ffff880036051a98 ffff880074ffbfd8 0000000000013d00
> > [ 287.088481] ffff8801005badc0 ffff8800360516e0 ffff88001ffef128 ffff88001fc53d00
> > [ 287.088484] Call Trace:
> > [ 287.088488] [<ffffffff8110c070>] ? sync_page+0x0/0x50
> > [ 287.088491] [<ffffffff815c0990>] io_schedule+0x70/0xc0
> > [ 287.088494] [<ffffffff8110c0b0>] sync_page+0x40/0x50
> > [ 287.088497] [<ffffffff815c130f>] __wait_on_bit+0x5f/0x90
> > [ 287.088500] [<ffffffff8110c278>] wait_on_page_bit+0x78/0x80
> > [ 287.088503] [<ffffffff81087f70>] ? wake_bit_function+0x0/0x50
> > [ 287.088506] [<ffffffff8110dffd>] __lock_page_or_retry+0x3d/0x70
> > [ 287.088509] [<ffffffff8110e3c7>] filemap_fault+0x397/0x4a0
> > [ 287.088513] [<ffffffff81177110>] ? pollwake+0x0/0x60
> > [ 287.088516] [<ffffffff8112d144>] __do_fault+0x54/0x520
> > [ 287.088519] [<ffffffff81177110>] ? pollwake+0x0/0x60
> > [ 287.088522] [<ffffffff811309da>] handle_pte_fault+0xfa/0x210
> > [ 287.088525] [<ffffffff8111561d>] ? __free_pages+0x2d/0x40
> > [ 287.088527] [<ffffffff8112de4f>] ? __pte_alloc+0xdf/0x100
> > [ 287.088530] [<ffffffff81131d5d>] handle_mm_fault+0x16d/0x250
> > [ 287.088533] [<ffffffff815c6a47>] do_page_fault+0x1a7/0x540
> > [ 287.088537] [<ffffffff81013859>] ? read_tsc+0x9/0x20
> > [ 287.088540] [<ffffffff81092eb1>] ? ktime_get_ts+0xb1/0xf0
> > [ 287.088543] [<ffffffff811776d2>] ? poll_select_set_timeout+0x82/0x90
> > [ 287.088546] [<ffffffff815c34d5>] page_fault+0x25/0x30
> > [ 287.088559] INFO: task unity-panel-ser:1521 blocked for more than 30 seconds.
> > [ 287.088561] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> > [ 287.088562] unity-panel-ser D 0000000000000000 0 1521 1 0x00000000
> > [ 287.088566] ffff880061f37b68 0000000000000082 ffff880061f37fd8 ffff880061f36000
> > [ 287.088570] 0000000000013d00 ffff880068c7c858 ffff880061f37fd8 0000000000013d00
> > [ 287.088573] ffff88003591c4a0 ffff880068c7c4a0 ffff88001fff0c88 ffff88001fc13d00
> > [ 287.088577] Call Trace:
> > [ 287.088581] [<ffffffff8110c070>] ? sync_page+0x0/0x50
> > [ 287.088583] [<ffffffff815c0990>] io_schedule+0x70/0xc0
> > [ 287.088587] [<ffffffff8110c0b0>] sync_page+0x40/0x50
> > [ 287.088589] [<ffffffff815c130f>] __wait_on_bit+0x5f/0x90
> > [ 287.088593] [<ffffffff8110c278>] wait_on_page_bit+0x78/0x80
> > [ 287.088596] [<ffffffff81087f70>] ? wake_bit_function+0x0/0x50
> > [ 287.088599] [<ffffffff8110dffd>] __lock_page_or_retry+0x3d/0x70
> > [ 287.088602] [<ffffffff8110e3c7>] filemap_fault+0x397/0x4a0
> > [ 287.088605] [<ffffffff8112d144>] __do_fault+0x54/0x520
> > [ 287.088608] [<ffffffff811309da>] handle_pte_fault+0xfa/0x210
> > [ 287.088610] [<ffffffff8111561d>] ? __free_pages+0x2d/0x40
> > [ 287.088613] [<ffffffff8112de4f>] ? __pte_alloc+0xdf/0x100
> > [ 287.088616] [<ffffffff81131d5d>] handle_mm_fault+0x16d/0x250
> > [ 287.088619] [<ffffffff815c6a47>] do_page_fault+0x1a7/0x540
> > [ 287.088622] [<ffffffff81136f85>] ? do_mmap_pgoff+0x335/0x370
> > [ 287.088625] [<ffffffff815c34d5>] page_fault+0x25/0x30
> > [ 287.088629] INFO: task jbd2/sda4-8:1845 blocked for more than 30 seconds.
> > [ 287.088630] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> > [ 287.088632] jbd2/sda4-8 D 0000000000000000 0 1845 2 0x00000000
> > [ 287.088636] ffff880068f6baf0 0000000000000046 ffff880068f6bfd8 ffff880068f6a000
> > [ 287.088639] 0000000000013d00 ffff880061d603b8 ffff880068f6bfd8 0000000000013d00
> > [ 287.088643] ffff88003591c4a0 ffff880061d60000 ffff88001fff8548 ffff88001fc13d00
> > [ 287.088647] Call Trace:
> > [ 287.088650] [<ffffffff8110c070>] ? sync_page+0x0/0x50
> > [ 287.088653] [<ffffffff815c0990>] io_schedule+0x70/0xc0
> > [ 287.088656] [<ffffffff8110c0b0>] sync_page+0x40/0x50
> > [ 287.088659] [<ffffffff815c130f>] __wait_on_bit+0x5f/0x90
> > [ 287.088662] [<ffffffff8110c278>] wait_on_page_bit+0x78/0x80
> > [ 287.088665] [<ffffffff81087f70>] ? wake_bit_function+0x0/0x50
> > [ 287.088668] [<ffffffff8110c41d>] filemap_fdatawait_range+0xfd/0x190
> > [ 287.088672] [<ffffffff8110c4db>] filemap_fdatawait+0x2b/0x30
> > [ 287.088675] [<ffffffff81242a93>] journal_finish_inode_data_buffers+0x63/0x170
> > [ 287.088678] [<ffffffff81243284>] jbd2_journal_commit_transaction+0x6e4/0x1190
> > [ 287.088682] [<ffffffff81076185>] ? try_to_del_timer_sync+0x85/0xe0
> > [ 287.088685] [<ffffffff81247e9b>] kjournald2+0xbb/0x220
> > [ 287.088688] [<ffffffff81087f30>] ? autoremove_wake_function+0x0/0x40
> > [ 287.088691] [<ffffffff81247de0>] ? kjournald2+0x0/0x220
> > [ 287.088694] [<ffffffff810877e6>] kthread+0x96/0xa0
> > [ 287.088697] [<ffffffff8100ce24>] kernel_thread_helper+0x4/0x10
> > [ 287.088700] [<ffffffff81087750>] ? kthread+0x0/0xa0
> > [ 287.088703] [<ffffffff8100ce20>] ? kernel_thread_helper+0x0/0x10
> > [ 287.088705] INFO: task dirname:5969 blocked for more than 30 seconds.
> > [ 287.088707] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> > [ 287.088709] dirname D 0000000000000002 0 5969 5214 0x00000000
> > [ 287.088712] ffff88005bd9d8b8 0000000000000086 ffff88005bd9dfd8 ffff88005bd9c000
> > [ 287.088716] 0000000000013d00 ffff88005d65b178 ffff88005bd9dfd8 0000000000013d00
> > [ 287.088720] ffff8801005e5b80 ffff88005d65adc0 ffff88001ffe5228 ffff88001fc53d00
> > [ 287.088723] Call Trace:
> > [ 287.088726] [<ffffffff8110c070>] ? sync_page+0x0/0x50
> > [ 287.088729] [<ffffffff815c0990>] io_schedule+0x70/0xc0
> > [ 287.088732] [<ffffffff8110c0b0>] sync_page+0x40/0x50
> > [ 287.088735] [<ffffffff815c130f>] __wait_on_bit+0x5f/0x90
> > [ 287.088738] [<ffffffff8110c278>] wait_on_page_bit+0x78/0x80
> > [ 287.088741] [<ffffffff81087f70>] ? wake_bit_function+0x0/0x50
> > [ 287.088744] [<ffffffff8110dffd>] __lock_page_or_retry+0x3d/0x70
> > [ 287.088747] [<ffffffff8110e3c7>] filemap_fault+0x397/0x4a0
> > [ 287.088750] [<ffffffff8112d144>] __do_fault+0x54/0x520
> > [ 287.088753] [<ffffffff811309da>] handle_pte_fault+0xfa/0x210
> > [ 287.088756] [<ffffffff810442a7>] ? pte_alloc_one+0x37/0x50
> > [ 287.088759] [<ffffffff815c2cce>] ? _raw_spin_lock+0xe/0x20
> > [ 287.088761] [<ffffffff8112de25>] ? __pte_alloc+0xb5/0x100
> > [ 287.088764] [<ffffffff81131d5d>] handle_mm_fault+0x16d/0x250
> > [ 287.088767] [<ffffffff815c6a47>] do_page_fault+0x1a7/0x540
> > [ 287.088770] [<ffffffff81136947>] ? mmap_region+0x1f7/0x500
> > [ 287.088773] [<ffffffff8112db06>] ? free_pgd_range+0x356/0x4a0
> > [ 287.088776] [<ffffffff815c34d5>] page_fault+0x25/0x30
> > [ 287.088779] [<ffffffff812e6d5f>] ? __clear_user+0x3f/0x70
> > [ 287.088782] [<ffffffff812e6d41>] ? __clear_user+0x21/0x70
> > [ 287.088786] [<ffffffff812e6dc6>] clear_user+0x36/0x40
> > [ 287.088788] [<ffffffff811b0b6d>] padzero+0x2d/0x40
> > [ 287.088791] [<ffffffff811b2c7a>] load_elf_binary+0x95a/0xe00
> > [ 287.088794] [<ffffffff8116aa8a>] search_binary_handler+0xda/0x300
> > [ 287.088797] [<ffffffff811b2320>] ? load_elf_binary+0x0/0xe00
> > [ 287.088800] [<ffffffff8116c49c>] do_execve+0x24c/0x2d0
> > [ 287.088802] [<ffffffff8101521a>] sys_execve+0x4a/0x80
> > [ 287.088805] [<ffffffff8100c45c>] stub_execve+0x6c/0xc0
> > --
> > Jan Kara <jack@suse.cz>
> > SUSE Labs, CR
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at http://vger.kernel.org/majordomo-info.html

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