Date:	Mon, 3 Aug 2015 17:15:25 +0200
From:	Jan Kara <jack@...e.cz>
To:	Nikolay Borisov <kernel@...p.com>
Cc:	linux-ext4@...r.kernel.org, Theodore Ts'o <tytso@....edu>,
	Marian Marinov <mm@...com>
Subject: Re: Yet another ext4/jbd2 lockup

  Hello,

On Wed 29-07-15 16:33:18, Nikolay Borisov wrote:
> Again, I have come up against a rather annoying ext4/jbd2 
> lock and I'm not sure it's the same issue as the last one 
> I posted (http://marc.info/?l=linux-ext4&m=143522748527527&w=2). 
> Again, all of this is happening on an 3.12.28 kernel. I did grep for
> the ext4 commits that have come afterwards but none of them allude to
> fixing something similar. This time the blocked process is an rsync 
> which has been running OUTSIDE of a container e.g. in the / cgroup 
> but it was copying stuff from a dm-thin volume acting as the root 
> device for a cgroup: 
> 
> rsync           D ffffffff81622100     0 33158      1 0x00000004
>  ffff882ad6257b18 0000000000000086 ffff883cfb3e5280 0000000000011640
>  ffff882ad6257fd8 ffff882ad6256010 0000000000011640 0000000000011640
>  ffff882ad6257fd8 0000000000011640 ffff881fd3213180 ffff883cfb3e5280
> Call Trace:
>  [<ffffffff81573f24>] schedule+0x24/0x70
>  [<ffffffff8122f64c>] wait_transaction_locked+0x7c/0xb0
>  [<ffffffff81097a70>] ? wake_up_bit+0x40/0x40
>  [<ffffffff8122faf2>] start_this_handle+0x2c2/0x660
>  [<ffffffff8116a8fd>] ? d_rehash+0x1d/0x30
>  [<ffffffff8113b7f5>] ? kmem_cache_alloc+0xb5/0x150
>  [<ffffffff81230229>] jbd2__journal_start+0x109/0x1b0
>  [<ffffffff8120fe31>] __ext4_journal_start_sb+0x61/0xb0
>  [<ffffffff811ebbe7>] __ext4_new_inode+0x5b7/0x1330
>  [<ffffffff8115db8e>] ? __lookup_hash+0x1e/0x40
>  [<ffffffff811fb7ec>] ext4_mkdir+0x18c/0x400
>  [<ffffffff8115de05>] ? generic_permission+0xc5/0x230
>  [<ffffffff8115f018>] vfs_mkdir+0xb8/0x100
>  [<ffffffff811614e2>] SyS_mkdirat+0xb2/0x100
>  [<ffffffff8115dc44>] SyS_mkdir+0x14/0x20
>  [<ffffffff815763a2>] system_call_fastpath+0x16/0x1b

So this is waiting to start a new transaction in the journal.

> Sampling echo "w" > /proc/sysrq-trigger I found some other 

You can just attach full output from the above command. That way we can be
sure we see all the pieces...

> blocked process which might be related to the issue. In particular: 
> 
> jbd2/dm-24-8    D 0000000000000000     0 31263      2 0x00000000
>  ffff882af46df9f8 0000000000000046 ffff882643db0000 0000000000011640
>  ffff882af46dffd8 ffff882af46de010 0000000000011640 0000000000011640
>  ffff882af46dffd8 0000000000011640 ffff8827c519ca40 ffff882643db0000
> Call Trace:
>  [<ffffffff810f4fc0>] ? __lock_page+0x70/0x70
>  [<ffffffff81573f24>] schedule+0x24/0x70
>  [<ffffffff81573ff7>] io_schedule+0x87/0xd0
>  [<ffffffff810f4fc9>] sleep_on_page+0x9/0x10
>  [<ffffffff81571a45>] __wait_on_bit_lock+0x55/0xb0
>  [<ffffffff810f4b0a>] ? find_get_pages_tag+0xca/0x170
>  [<ffffffff810f4fb2>] __lock_page+0x62/0x70
>  [<ffffffff81097af0>] ? wake_atomic_t_function+0x40/0x40
>  [<ffffffff81101c30>] ? pagevec_lookup_tag+0x20/0x30
>  [<ffffffff810fffe1>] write_cache_pages+0x391/0x470
>  [<ffffffff810fec20>] ? set_page_dirty+0x60/0x60
>  [<ffffffff8110010c>] generic_writepages+0x4c/0x70
>  [<ffffffff81231b0b>] jbd2_journal_commit_transaction+0x41b/0x1790
>  [<ffffffff81083be7>] ? lock_timer_base+0x37/0x70
>  [<ffffffff81235d12>] kjournald2+0xc2/0x250
>  [<ffffffff81097a70>] ? wake_up_bit+0x40/0x40
>  [<ffffffff81235c50>] ? commit_timeout+0x10/0x10
>  [<ffffffff81097456>] kthread+0xc6/0xd0
>  [<ffffffff81097390>] ? kthread_freezable_should_stop+0x60/0x60
>  [<ffffffff815762fc>] ret_from_fork+0x7c/0xb0
>  [<ffffffff81097390>] ? kthread_freezable_should_stop+0x60/0x60

So jbd2 thread is waiting for page lock. Interesting...

> kworker/u81:90  D 0000000000000000     0 36695      2 0x00000000
> Workqueue: writeback bdi_writeback_workfn (flush-253:24)
>  ffff880155ee7888 0000000000000046 ffff881ea1a71080 0000000000011640
>  ffff880155ee7fd8 ffff880155ee6010 0000000000011640 0000000000011640
>  ffff880155ee7fd8 0000000000011640 ffff882119215ac0 ffff881ea1a71080
> Call Trace:
>  [<ffffffff81573f24>] schedule+0x24/0x70
>  [<ffffffff81235bc5>] jbd2_log_wait_commit+0xb5/0x130
>  [<ffffffff81097a70>] ? wake_up_bit+0x40/0x40
>  [<ffffffff810a04ce>] ? __wake_up+0x4e/0x70
>  [<ffffffff8122f43b>] jbd2_journal_stop+0x1bb/0x2c0
>  [<ffffffff8120fda8>] __ext4_journal_stop+0x78/0xa0
>  [<ffffffff811f366f>] ext4_writepages+0x45f/0xa50
>  [<ffffffff8110014b>] do_writepages+0x1b/0x30
>  [<ffffffff811794cd>] __writeback_single_inode+0x3d/0x130
>  [<ffffffff8117a637>] writeback_sb_inodes+0x207/0x3f0
>  [<ffffffff8117a8b6>] __writeback_inodes_wb+0x96/0xc0
>  [<ffffffff8117aabb>] wb_writeback+0x1db/0x1f0
>  [<ffffffff8117ac61>] wb_do_writeback+0x191/0x1a0
>  [<ffffffff8117ace8>] bdi_writeback_workfn+0x78/0x1b0
>  [<ffffffff810a4312>] ? wake_up_process+0x22/0x40
>  [<ffffffff8109078b>] process_one_work+0x13b/0x460
>  [<ffffffff81091a09>] worker_thread+0x119/0x3f0
>  [<ffffffff810918f0>] ? manage_workers+0x2c0/0x2c0
>  [<ffffffff81097456>] kthread+0xc6/0xd0
>  [<ffffffff81097390>] ? kthread_freezable_should_stop+0x60/0x60
>  [<ffffffff815762fc>] ret_from_fork+0x7c/0xb0
>  [<ffffffff81097390>] ? kthread_freezable_should_stop+0x60/0x60

And this is likely the culprit - flusher thread is waiting for journal
commit from jbd2_journal_stop() at which point it may be holding page locks
which are blocking jbd2 thread. Now waiting from transaction commit from
jbd2_journal_stop() is really unexpected. That happens only if the
handle was a sync one and the only way I can see handle becoming a sync one
from a writeback path is when this would be the first file over 4 GB in the
filesystem which looks really unlikely... Can you post output of dumpe2fs
for the filesystem? Thanks!

								Honza

> Basically dm-24 is the device this rsync was syncing from  and the 
> kworker is running as part of writeback for the same device 
> (253:24 is the major:minor for this particular device). 
> Furthermore, I see there have been a number of "sync" executed and 
> their stack traces look like the following: 
> 
> sync            D ffffffff81622100     0 17596  17532 0x00000000
>  ffff8827cf1fdd78 0000000000000086 ffff88348291b9c0 0000000000011640
>  ffff8827cf1fdfd8 ffff8827cf1fc010 0000000000011640 0000000000011640
>  ffff8827cf1fdfd8 0000000000011640 ffff881fd32118c0 ffff88348291b9c0
> Call Trace:
>  [<ffffffff81573f24>] schedule+0x24/0x70
>  [<ffffffff81571955>] schedule_timeout+0x185/0x1c0
>  [<ffffffff810904c2>] ? __queue_delayed_work+0x82/0x150
>  [<ffffffff81574984>] wait_for_completion+0x94/0x100
>  [<ffffffff810a42d0>] ? try_to_wake_up+0x2b0/0x2b0
>  [<ffffffff81179a28>] ? bdi_queue_work+0x48/0xb0
>  [<ffffffff8117e830>] ? fdatawrite_one_bdev+0x20/0x20
>  [<ffffffff81179c56>] sync_inodes_sb+0xa6/0x1c0
>  [<ffffffff8117e830>] ? fdatawrite_one_bdev+0x20/0x20
>  [<ffffffff8117e845>] sync_inodes_one_sb+0x15/0x20
>  [<ffffffff81157b29>] iterate_supers+0xa9/0xe0
>  [<ffffffff8117e880>] sys_sync+0x30/0x90
>  [<ffffffff815763a2>] system_call_fastpath+0x16/0x1b
> 
> I believe it is this sync which has triggered the bdi_writeback_workfn 
> for the particular dm device. Essentially what I gather is that the 
> rsync is locked since it wants to do some filesystem activity, hence 
> it wants to start a transaction but it's blocked due to an unfinished 
> transaction - presumably the one from the writeback path. However, 
> the writeback is blocked in jbd2_log_wait_commit, waiting for its 
> own transaction to complete and it is not progressing due to some 
> reason. There hasn't been any OOM messages for the container in 
> question and the global OOM killer hasn't triggered. The memory 
> state of the machine when this was observed. There still some 
> memory: 
> 
> SysRq : Show Memory
> Mem-Info:
> Node 0 DMA per-cpu:
> CPU    0: hi:    0, btch:   1 usd:   0
> CPU    1: hi:    0, btch:   1 usd:   0
> CPU    2: hi:    0, btch:   1 usd:   0
> CPU    3: hi:    0, btch:   1 usd:   0
> CPU    4: hi:    0, btch:   1 usd:   0
> CPU    5: hi:    0, btch:   1 usd:   0
> CPU    6: hi:    0, btch:   1 usd:   0
> CPU    7: hi:    0, btch:   1 usd:   0
> CPU    8: hi:    0, btch:   1 usd:   0
> CPU    9: hi:    0, btch:   1 usd:   0
> CPU   10: hi:    0, btch:   1 usd:   0
> CPU   11: hi:    0, btch:   1 usd:   0
> CPU   12: hi:    0, btch:   1 usd:   0
> CPU   13: hi:    0, btch:   1 usd:   0
> CPU   14: hi:    0, btch:   1 usd:   0
> CPU   15: hi:    0, btch:   1 usd:   0
> CPU   16: hi:    0, btch:   1 usd:   0
> CPU   17: hi:    0, btch:   1 usd:   0
> CPU   18: hi:    0, btch:   1 usd:   0
> CPU   19: hi:    0, btch:   1 usd:   0
> CPU   20: hi:    0, btch:   1 usd:   0
> CPU   21: hi:    0, btch:   1 usd:   0
> CPU   22: hi:    0, btch:   1 usd:   0
> CPU   23: hi:    0, btch:   1 usd:   0
> CPU   24: hi:    0, btch:   1 usd:   0
> CPU   25: hi:    0, btch:   1 usd:   0
> CPU   26: hi:    0, btch:   1 usd:   0
> CPU   27: hi:    0, btch:   1 usd:   0
> CPU   28: hi:    0, btch:   1 usd:   0
> CPU   29: hi:    0, btch:   1 usd:   0
> CPU   30: hi:    0, btch:   1 usd:   0
> CPU   31: hi:    0, btch:   1 usd:   0
> CPU   32: hi:    0, btch:   1 usd:   0
> CPU   33: hi:    0, btch:   1 usd:   0
> CPU   34: hi:    0, btch:   1 usd:   0
> CPU   35: hi:    0, btch:   1 usd:   0
> CPU   36: hi:    0, btch:   1 usd:   0
> CPU   37: hi:    0, btch:   1 usd:   0
> CPU   38: hi:    0, btch:   1 usd:   0
> CPU   39: hi:    0, btch:   1 usd:   0
> Node 0 DMA32 per-cpu:
> CPU    0: hi:  186, btch:  31 usd: 177
> CPU    1: hi:  186, btch:  31 usd: 129
> CPU    2: hi:  186, btch:  31 usd: 145
> CPU    3: hi:  186, btch:  31 usd:  60
> CPU    4: hi:  186, btch:  31 usd: 105
> CPU    5: hi:  186, btch:  31 usd:  96
> CPU    6: hi:  186, btch:  31 usd:  71
> CPU    7: hi:  186, btch:  31 usd:  53
> CPU    8: hi:  186, btch:  31 usd: 121
> CPU    9: hi:  186, btch:  31 usd: 171
> CPU   10: hi:  186, btch:  31 usd:  77
> CPU   11: hi:  186, btch:  31 usd:   0
> CPU   12: hi:  186, btch:  31 usd:   0
> CPU   13: hi:  186, btch:  31 usd:   0
> CPU   14: hi:  186, btch:  31 usd:  29
> CPU   15: hi:  186, btch:  31 usd:  36
> CPU   16: hi:  186, btch:  31 usd:   0
> CPU   17: hi:  186, btch:  31 usd:   0
> CPU   18: hi:  186, btch:  31 usd:   0
> CPU   19: hi:  186, btch:  31 usd:  22
> CPU   20: hi:  186, btch:  31 usd:  76
> CPU   21: hi:  186, btch:  31 usd: 161
> CPU   22: hi:  186, btch:  31 usd:  73
> CPU   23: hi:  186, btch:  31 usd:  78
> CPU   24: hi:  186, btch:  31 usd: 125
> CPU   25: hi:  186, btch:  31 usd:  73
> CPU   26: hi:  186, btch:  31 usd:  72
> CPU   27: hi:  186, btch:  31 usd:  38
> CPU   28: hi:  186, btch:  31 usd: 118
> CPU   29: hi:  186, btch:  31 usd:  63
> CPU   30: hi:  186, btch:  31 usd:   0
> CPU   31: hi:  186, btch:  31 usd:   0
> CPU   32: hi:  186, btch:  31 usd:   0
> CPU   33: hi:  186, btch:  31 usd:   0
> CPU   34: hi:  186, btch:  31 usd:   0
> CPU   35: hi:  186, btch:  31 usd:   0
> CPU   36: hi:  186, btch:  31 usd:   0
> CPU   37: hi:  186, btch:  31 usd:   0
> CPU   38: hi:  186, btch:  31 usd:   0
> CPU   39: hi:  186, btch:  31 usd:   0
> Node 0 Normal per-cpu:
> CPU    0: hi:  186, btch:  31 usd: 188
> CPU    1: hi:  186, btch:  31 usd: 174
> CPU    2: hi:  186, btch:  31 usd: 116
> CPU    3: hi:  186, btch:  31 usd:  96
> CPU    4: hi:  186, btch:  31 usd: 169
> CPU    5: hi:  186, btch:  31 usd: 137
> CPU    6: hi:  186, btch:  31 usd: 102
> CPU    7: hi:  186, btch:  31 usd:  96
> CPU    8: hi:  186, btch:  31 usd: 149
> CPU    9: hi:  186, btch:  31 usd: 203
> CPU   10: hi:  186, btch:  31 usd: 179
> CPU   11: hi:  186, btch:  31 usd: 181
> CPU   12: hi:  186, btch:  31 usd: 159
> CPU   13: hi:  186, btch:  31 usd: 160
> CPU   14: hi:  186, btch:  31 usd: 179
> CPU   15: hi:  186, btch:  31 usd: 158
> CPU   16: hi:  186, btch:  31 usd: 180
> CPU   17: hi:  186, btch:  31 usd: 155
> CPU   18: hi:  186, btch:  31 usd: 156
> CPU   19: hi:  186, btch:  31 usd: 173
> CPU   20: hi:  186, btch:  31 usd: 161
> CPU   21: hi:  186, btch:  31 usd: 163
> CPU   22: hi:  186, btch:  31 usd: 123
> CPU   23: hi:  186, btch:  31 usd: 157
> CPU   24: hi:  186, btch:  31 usd:  19
> CPU   25: hi:  186, btch:  31 usd: 159
> CPU   26: hi:  186, btch:  31 usd: 176
> CPU   27: hi:  186, btch:  31 usd: 140
> CPU   28: hi:  186, btch:  31 usd: 180
> CPU   29: hi:  186, btch:  31 usd: 169
> CPU   30: hi:  186, btch:  31 usd: 158
> CPU   31: hi:  186, btch:  31 usd: 181
> CPU   32: hi:  186, btch:  31 usd: 181
> CPU   33: hi:  186, btch:  31 usd: 159
> CPU   34: hi:  186, btch:  31 usd: 168
> CPU   35: hi:  186, btch:  31 usd: 173
> CPU   36: hi:  186, btch:  31 usd: 161
> CPU   37: hi:  186, btch:  31 usd: 179
> CPU   38: hi:  186, btch:  31 usd: 184
> CPU   39: hi:  186, btch:  31 usd: 182
> Node 1 Normal per-cpu:
> CPU    0: hi:  186, btch:  31 usd: 164
> CPU    1: hi:  186, btch:  31 usd: 167
> CPU    2: hi:  186, btch:  31 usd: 160
> CPU    3: hi:  186, btch:  31 usd: 171
> CPU    4: hi:  186, btch:  31 usd: 175
> CPU    5: hi:  186, btch:  31 usd: 184
> CPU    6: hi:  186, btch:  31 usd: 169
> CPU    7: hi:  186, btch:  31 usd: 159
> CPU    8: hi:  186, btch:  31 usd: 171
> CPU    9: hi:  186, btch:  31 usd: 185
> CPU   10: hi:  186, btch:  31 usd:  86
> CPU   11: hi:  186, btch:  31 usd:  73
> CPU   12: hi:  186, btch:  31 usd:  29
> CPU   13: hi:  186, btch:  31 usd:  62
> CPU   14: hi:  186, btch:  31 usd:  91
> CPU   15: hi:  186, btch:  31 usd: 114
> CPU   16: hi:  186, btch:  31 usd:  69
> CPU   17: hi:  186, btch:  31 usd: 117
> CPU   18: hi:  186, btch:  31 usd:  17
> CPU   19: hi:  186, btch:  31 usd:  20
> CPU   20: hi:  186, btch:  31 usd: 163
> CPU   21: hi:  186, btch:  31 usd: 161
> CPU   22: hi:  186, btch:  31 usd: 175
> CPU   23: hi:  186, btch:  31 usd: 172
> CPU   24: hi:  186, btch:  31 usd: 177
> CPU   25: hi:  186, btch:  31 usd: 171
> CPU   26: hi:  186, btch:  31 usd: 157
> CPU   27: hi:  186, btch:  31 usd: 171
> CPU   28: hi:  186, btch:  31 usd: 182
> CPU   29: hi:  186, btch:  31 usd: 183
> CPU   30: hi:  186, btch:  31 usd:  40
> CPU   31: hi:  186, btch:  31 usd: 157
> CPU   32: hi:  186, btch:  31 usd:  76
> CPU   33: hi:  186, btch:  31 usd: 157
> CPU   34: hi:  186, btch:  31 usd:  63
> CPU   35: hi:  186, btch:  31 usd:  62
> CPU   36: hi:  186, btch:  31 usd:  58
> CPU   37: hi:  186, btch:  31 usd:  36
> CPU   38: hi:  186, btch:  31 usd:  19
> CPU   39: hi:  186, btch:  31 usd:  47
> active_anon:6762239 inactive_anon:12245334 isolated_anon:0
>  active_file:10705451 inactive_file:11321321 isolated_file:0
>  unevictable:5516901 dirty:457441 writeback:0 unstable:0
>  free:1028680 slab_reclaimable:3791349 slab_unreclaimable:13461537
>  mapped:1567688 shmem:904717 pagetables:362061 bounce:0
>  free_cma:0
> Node 0 DMA free:15532kB min:8kB low:8kB high:12kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15976kB managed:15892kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes
> lowmem_reserve[]: 0 1668 128642 128642
> Node 0 DMA32 free:509204kB min:1164kB low:1452kB high:1744kB active_anon:6016kB inactive_anon:13164kB active_file:2584kB inactive_file:5756kB unevictable:1112kB isolated(anon):0kB isolated(file):0kB present:2045980kB managed:1708904kB mlocked:1224kB dirty:20kB writeback:0kB mapped:4164kB shmem:3900kB slab_reclaimable:463020kB slab_unreclaimable:671072kB kernel_stack:1224kB pagetables:4268kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
> lowmem_reserve[]: 0 0 126973 126973
> Node 0 Normal free:189488kB min:88804kB low:111004kB high:133204kB active_anon:16411204kB inactive_anon:24056744kB active_file:19949588kB inactive_file:22435040kB unevictable:8645768kB isolated(anon):0kB isolated(file):0kB present:132120576kB managed:130020968kB mlocked:8657300kB dirty:1773000kB writeback:0kB mapped:2878728kB shmem:1624252kB slab_reclaimable:6834156kB slab_unreclaimable:29014116kB kernel_stack:65736kB pagetables:711944kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
> lowmem_reserve[]: 0 0 0 0
> Node 1 Normal free:3393536kB min:90240kB low:112800kB high:135360kB active_anon:10638288kB inactive_anon:24911428kB active_file:22869632kB inactive_file:22844488kB unevictable:13420724kB isolated(anon):0kB isolated(file):0kB present:134217728kB managed:132117884kB mlocked:13427472kB dirty:56744kB writeback:0kB mapped:3387860kB shmem:1990716kB slab_reclaimable:7868220kB slab_unreclaimable:24160960kB kernel_stack:90600kB pagetables:731280kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
> lowmem_reserve[]: 0 0 0 0
> Node 0 DMA: 1*4kB (U) 1*8kB (U) 0*16kB 1*32kB (U) 0*64kB 1*128kB (U) 0*256kB 0*512kB 1*1024kB (U) 1*2048kB (U) 3*4096kB (MR) = 15532kB
> Node 0 DMA32: 612*4kB (UEM) 1081*8kB (UEM) 295*16kB (UEM) 412*32kB (UEM) 288*64kB (UEM) 118*128kB (UEM) 63*256kB (UEM) 49*512kB (UEM) 30*1024kB (UEM) 29*2048kB (UEM) 77*4096kB (UMR) = 509256kB
> Node 0 Normal: 44891*4kB (UE) 0*8kB 0*16kB 5*32kB (R) 4*64kB (R) 2*128kB (R) 1*256kB (R) 1*512kB (R) 1*1024kB (R) 0*2048kB 1*4096kB (R) = 186124kB
> Node 1 Normal: 467218*4kB (UEM) 145540*8kB (UEM) 18995*16kB (UEM) 1482*32kB (UMR) 5*64kB (R) 1*128kB (R) 2*256kB (R) 1*512kB (R) 1*1024kB (R) 0*2048kB 1*4096kB (R) = 3391128kB
> 23967743 total pagecache pages
> 1034858 pages in swap cache
> Swap cache stats: add 154167590, delete 153132732, find 2698616740/2708213552
> Free swap  = 16464476kB
> Total swap = 41943036kB
> 67100065 pages RAM
> 0 pages HighMem/MovableOnly
> 524961 pages reserved
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Jan Kara <jack@...e.com>
SUSE Labs, CR
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