我有一个正在开发中的 Ubuntu Server 11.04 natty，上面运行着一个基于 jetty 的 Web 服务器。
今天我遇到了一次停电，我无法访问 ssh 或 Web 服务器，持续时间未知，但大概在几分钟（5-60 分钟？）范围内。
我在系统日志中看到以下内容，并发现其他讨论与此错误相关的系统挂起。
我想知道是否有人能理解这一点。这些是 AWS 的 cloud.ubuntu.com/ami 图像。
Oct 13 22:03:43 localhost kernel: [185521.096127] INFO: task jbd2/xvda1-8:136 blocked for more than 120 seconds.
Oct 13 22:03:43 localhost kernel: [185521.096146] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Oct 13 22:03:43 localhost kernel: [185521.096157] jbd2/xvda1-8 D eb35fe18 0 136 2 0x00000000
Oct 13 22:03:43 localhost kernel: [185521.096162] eb35fe60 00000246 eb1b09b8 eb35fe18 c0135b80 44bcee4c eb3141ac c097f680
Oct 13 22:03:43 localhost kernel: [185521.096168] 3b71d7cd 0000a892 eb3141a8 c097f680 c097f680 ec696680 eb313f20 e9a40000
Oct 13 22:03:43 localhost kernel: [185521.096174] c08c6f80 0187099e eb35fe20 c01077d9 eb35fe28 eb1b09b8 eb35fe58 c0181af8
Oct 13 22:03:43 localhost kernel: [185521.096180] Call Trace:
<call trace cut>
Oct 13 22:03:43 localhost kernel: [185521.096272] INFO: task java:11610 blocked for more than 120 seconds.
<same info from first message, cut for clarity>
Oct 13 22:03:43 localhost kernel: [185521.096430] INFO: task java:11614 blocked for more than 120 seconds.
<same info from first message, cut for clarity>
Oct 13 22:03:43 localhost kernel: [185521.096586] INFO: task java:11632 blocked for more than 120 seconds.
<same info from first message, cut for clarity>
Oct 13 22:03:43 localhost kernel: [185521.096745] INFO: task java:11633 blocked for more than 120 seconds.
<same info from first message, cut for clarity>
Oct 13 22:05:43 localhost kernel: [185641.096048] INFO: task jbd2/xvda1-8:136 blocked for more than 120 seconds.
<same info from first message, cut for clarity>
Oct 13 22:05:43 localhost kernel: [185641.096194] INFO: task java:11610 blocked for more than 120 seconds.
<same info from first message, cut for clarity>
Oct 13 22:05:43 localhost kernel: [185641.096353] INFO: task java:11614 blocked for more than 120 seconds.
<same info from first message, cut for clarity>
Oct 13 22:05:43 localhost kernel: [185641.096512] INFO: task java:11632 blocked for more than 120 seconds.
<same info from first message, cut for clarity>
Oct 13 22:05:43 localhost kernel: [185641.096673] INFO: task java:11633 blocked for more than 120 seconds.
<same info from first message, cut for clarity>
完整日志和堆栈跟踪在这里：
Oct 13 22:03:43 localhost kernel: [185521.096127] INFO: task jbd2/xvda1-8:136 blocked for more than 120 seconds.
Oct 13 22:03:43 localhost kernel: [185521.096146] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Oct 13 22:03:43 localhost kernel: [185521.096157] jbd2/xvda1-8 D eb35fe18 0 136 2 0x00000000
Oct 13 22:03:43 localhost kernel: [185521.096162] eb35fe60 00000246 eb1b09b8 eb35fe18 c0135b80 44bcee4c eb3141ac c097f680
Oct 13 22:03:43 localhost kernel: [185521.096168] 3b71d7cd 0000a892 eb3141a8 c097f680 c097f680 ec696680 eb313f20 e9a40000
Oct 13 22:03:43 localhost kernel: [185521.096174] c08c6f80 0187099e eb35fe20 c01077d9 eb35fe28 eb1b09b8 eb35fe58 c0181af8
Oct 13 22:03:43 localhost kernel: [185521.096180] Call Trace:
Oct 13 22:03:43 localhost kernel: [185521.096190] [<c0135b80>] ? pvclock_clocksource_read+0xa0/0x110
Oct 13 22:03:43 localhost kernel: [185521.096195] [<c01077d9>] ? xen_clocksource_read+0x19/0x20
Oct 13 22:03:43 localhost kernel: [185521.096200] [<c0181af8>] ? ktime_get_ts+0xf8/0x120
Oct 13 22:03:43 localhost kernel: [185521.096206] [<c06355af>] io_schedule+0x5f/0xa0
Oct 13 22:03:43 localhost kernel: [185521.096211] [<c0259c58>] sync_buffer+0x38/0x40
Oct 13 22:03:43 localhost kernel: [185521.096215] [<c0635dad>] __wait_on_bit+0x4d/0x70
Oct 13 22:03:43 localhost kernel: [185521.096218] [<c0259c20>] ? sync_buffer+0x0/0x40
Oct 13 22:03:43 localhost kernel: [185521.096221] [<c0259c20>] ? sync_buffer+0x0/0x40
Oct 13 22:03:43 localhost kernel: [185521.096224] [<c0635e31>] out_of_line_wait_on_bit+0x61/0x70
Oct 13 22:03:43 localhost kernel: [185521.096229] [<c0176e20>] ? wake_bit_function+0x0/0x60
Oct 13 22:03:43 localhost kernel: [185521.096232] [<c0259c1e>] __wait_on_buffer+0x2e/0x30
Oct 13 22:03:43 localhost kernel: [185521.096237] [<c02f6d6b>] jbd2_journal_commit_transaction+0x4cb/0xf30
Oct 13 22:03:43 localhost kernel: [185521.096241] [<c06373d9>] ? _raw_spin_unlock_irqrestore+0x19/0x20
Oct 13 22:03:43 localhost kernel: [185521.096245] [<c0167637>] ? try_to_del_timer_sync+0x67/0xb0
Oct 13 22:03:43 localhost kernel: [185521.096249] [<c02fb2fe>] kjournald2+0x8e/0x1c0
Oct 13 22:03:43 localhost kernel: [185521.096252] [<c0176dd0>] ? autoremove_wake_function+0x0/0x50
Oct 13 22:03:43 localhost kernel: [185521.096255] [<c02fb270>] ? kjournald2+0x0/0x1c0
Oct 13 22:03:43 localhost kernel: [185521.096258] [<c0176864>] kthread+0x74/0x80
Oct 13 22:03:43 localhost kernel: [185521.096261] [<c01767f0>] ? kthread+0x0/0x80
Oct 13 22:03:43 localhost kernel: [185521.096265] [<c010b0fe>] kernel_thread_helper+0x6/0x10
Oct 13 22:03:43 localhost kernel: [185521.096272] INFO: task java:11610 blocked for more than 120 seconds.
Oct 13 22:03:43 localhost kernel: [185521.096282] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Oct 13 22:03:43 localhost kernel: [185521.096291] java D c1157cd8 0 11610 1 0x00000000
Oct 13 22:03:43 localhost kernel: [185521.096295] c1157ce0 00000286 c01542dd c1157cd8 c010775b c1157cc4 c101742c c097f680
Oct 13 22:03:43 localhost kernel: [185521.096301] b3eb4995 0000a893 c1017428 c097f680 c097f680 ec696680 c10171a0 c086cf60
Oct 13 22:03:43 localhost kernel: [185521.096307] c1157ccc c0135b80 ba41686c 017f78fc 52d5d139 03e5075e 00000200 c10171a0
Oct 13 22:03:43 localhost kernel: [185521.096313] Call Trace:
Oct 13 22:03:43 localhost kernel: [185521.096317] [<c01542dd>] ? account_idle_ticks+0xd/0x10
Oct 13 22:03:43 localhost kernel: [185521.096320] [<c010775b>] ? do_stolen_accounting+0x21b/0x250
Oct 13 22:03:43 localhost kernel: [185521.096324] [<c0135b80>] ? pvclock_clocksource_read+0xa0/0x110
Oct 13 22:03:43 localhost kernel: [185521.096327] [<c010721e>] ? __raw_callee_save_xen_restore_fl+0x6/0x8
Oct 13 22:03:43 localhost kernel: [185521.096330] [<c06373d9>] ? _raw_spin_unlock_irqrestore+0x19/0x20
Oct 13 22:03:43 localhost kernel: [185521.096334] [<c0177038>] ? prepare_to_wait+0x48/0x70
Oct 13 22:03:43 localhost kernel: [185521.096337] [<c02f5ca5>] do_get_write_access+0x235/0x3f0
Oct 13 22:03:43 localhost kernel: [185521.096340] [<c025aa64>] ? __find_get_block+0xb4/0xe0
Oct 13 22:03:43 localhost kernel: [185521.096344] [<c0176e20>] ? wake_bit_function+0x0/0x60
Oct 13 22:03:43 localhost kernel: [185521.096348] [<c02f478d>] ? start_this_handle.clone.5+0x39d/0x420
Oct 13 22:03:43 localhost kernel: [185521.096352] [<c01424a4>] ? update_cfs_load+0x204/0x290
Oct 13 22:03:43 localhost kernel: [185521.096355] [<c02f5f68>] jbd2_journal_get_write_access+0x28/0x40
Oct 13 22:03:43 localhost kernel: [185521.096359] [<c02de97f>] __ext4_journal_get_write_access+0x2f/0x80
Oct 13 22:03:43 localhost kernel: [185521.096365] [<c02bbef7>] ext4_reserve_inode_write+0x67/0x80
Oct 13 22:03:43 localhost kernel: [185521.096368] [<c02bbf4c>] ext4_mark_inode_dirty+0x3c/0x1c0
Oct 13 22:03:43 localhost kernel: [185521.096374] [<c02d3423>] ? ext4_journal_start_sb+0x93/0x110
Oct 13 22:03:43 localhost kernel: [185521.096378] [<c02c0b51>] ? ext4_dirty_inode+0x31/0x50
Oct 13 22:03:43 localhost kernel: [185521.096381] [<c02c0b51>] ext4_dirty_inode+0x31/0x50
Oct 13 22:03:43 localhost kernel: [185521.096385] [<c0253ed9>] __mark_inode_dirty+0x29/0x1d0
Oct 13 22:03:43 localhost kernel: [185521.096388] [<c025b4ec>] ? __set_page_dirty+0x6c/0xc0
Oct 13 22:03:43 localhost kernel: [185521.096392] [<c0249741>] file_update_time+0xc1/0x140
Oct 13 22:03:43 localhost kernel: [185521.096396] [<c0208d1f>] do_wp_page+0x12f/0x820
Oct 13 22:03:43 localhost kernel: [185521.096399] [<c017ad89>] ? hrtimer_cancel+0x19/0x30
Oct 13 22:03:43 localhost kernel: [185521.096402] [<c020b276>] handle_pte_fault+0x296/0x2f0
Oct 13 22:03:43 localhost kernel: [185521.096406] [<c0105a64>] ? pte_mfn_to_pfn+0xa4/0xc0
Oct 13 22:03:43 localhost kernel: [185521.096409] [<c020bf39>] handle_mm_fault+0x109/0x1b0
Oct 13 22:03:43 localhost kernel: [185521.096413] [<c063aad0>] ? do_page_fault+0x0/0x490
Oct 13 22:03:43 localhost kernel: [185521.096416] [<c063ac2e>] do_page_fault+0x15e/0x490
Oct 13 22:03:43 localhost kernel: [185521.096421] [<c018b76e>] ? sys_futex+0x6e/0x120
Oct 13 22:03:43 localhost kernel: [185521.096424] [<c063aad0>] ? do_page_fault+0x0/0x490
Oct 13 22:03:43 localhost kernel: [185521.096427] [<c0637e3f>] error_code+0x67/0x6c
Oct 13 22:03:43 localhost kernel: [185521.096430] INFO: task java:11614 blocked for more than 120 seconds.
Oct 13 22:03:43 localhost kernel: [185521.096437] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Oct 13 22:03:43 localhost kernel: [185521.096446] java D eb1b3c44 0 11614 1 0x00000000
Oct 13 22:03:43 localhost kernel: [185521.096450] eb1b3c68 00000286 c010775b eb1b3c44 5f8f1640 0000a10a e9a4742c c097f680
Oct 13 22:03:43 localhost kernel: [185521.096456] e74d77b9 0000a890 e9a47428 c097f680 c097f680 ec696680 e9a471a0 c086cf60
Oct 13 22:03:43 localhost kernel: [185521.096462] c063732d eb1b3c3c c039391c ffffffe0 c02f478d eb089400 00000200 e9a471a0
Oct 13 22:03:43 localhost kernel: [185521.096468] Call Trace:
Oct 13 22:03:43 localhost kernel: [185521.096471] [<c010775b>] ? do_stolen_accounting+0x21b/0x250
Oct 13 22:03:43 localhost kernel: [185521.096474] [<c063732d>] ? _raw_spin_lock+0xd/0x10
Oct 13 22:03:43 localhost kernel: [185521.096478] [<c039391c>] ? __percpu_counter_add+0x8c/0xb0
Oct 13 22:03:43 localhost kernel: [185521.096481] [<c02f478d>] ? start_this_handle.clone.5+0x39d/0x420
Oct 13 22:03:43 localhost kernel: [185521.096485] [<c010721e>] ? __raw_callee_save_xen_restore_fl+0x6/0x8
Oct 13 22:03:43 localhost kernel: [185521.096488] [<c06373d9>] ? _raw_spin_unlock_irqrestore+0x19/0x20
Oct 13 22:03:43 localhost kernel: [185521.096491] [<c0177038>] ? prepare_to_wait+0x48/0x70
Oct 13 22:03:43 localhost kernel: [185521.096494] [<c02f5ca5>] do_get_write_access+0x235/0x3f0
Oct 13 22:03:43 localhost kernel: [185521.096498] [<c025aa64>] ? __find_get_block+0xb4/0xe0
Oct 13 22:03:43 localhost kernel: [185521.096501] [<c0176e20>] ? wake_bit_function+0x0/0x60
Oct 13 22:03:43 localhost kernel: [185521.096504] [<c02f478d>] ? start_this_handle.clone.5+0x39d/0x420
Oct 13 22:03:43 localhost kernel: [185521.096508] [<c01077d9>] ? xen_clocksource_read+0x19/0x20
Oct 13 22:03:43 localhost kernel: [185521.096511] [<c02f5f68>] jbd2_journal_get_write_access+0x28/0x40
Oct 13 22:03:43 localhost kernel: [185521.096515] [<c02de97f>] __ext4_journal_get_write_access+0x2f/0x80
Oct 13 22:03:43 localhost kernel: [185521.096518] [<c02bbef7>] ext4_reserve_inode_write+0x67/0x80
Oct 13 22:03:43 localhost kernel: [185521.096522] [<c02bbf4c>] ext4_mark_inode_dirty+0x3c/0x1c0
Oct 13 22:03:43 localhost kernel: [185521.096525] [<c02d3423>] ? ext4_journal_start_sb+0x93/0x110
Oct 13 22:03:43 localhost kernel: [185521.096529] [<c02c0b51>] ? ext4_dirty_inode+0x31/0x50
Oct 13 22:03:43 localhost kernel: [185521.096532] [<c02c0b51>] ext4_dirty_inode+0x31/0x50
Oct 13 22:03:43 localhost kernel: [185521.096535] [<c0253ed9>] __mark_inode_dirty+0x29/0x1d0
Oct 13 22:03:43 localhost kernel: [185521.096539] [<c03275d4>] ? security_inode_need_killpriv+0x14/0x20
Oct 13 22:03:43 localhost kernel: [185521.096543] [<c01eb644>] ? file_remove_suid+0x24/0x80
Oct 13 22:03:43 localhost kernel: [185521.096546] [<c0249741>] file_update_time+0xc1/0x140
Oct 13 22:03:43 localhost kernel: [185521.096550] [<c01ed478>] __generic_file_aio_write+0x1e8/0x4e0
Oct 13 22:03:43 localhost kernel: [185521.096553] [<c01ed7ce>] generic_file_aio_write+0x5e/0xd0
Oct 13 22:03:43 localhost kernel: [185521.096556] [<c06373d9>] ? _raw_spin_unlock_irqrestore+0x19/0x20
Oct 13 22:03:43 localhost kernel: [185521.096560] [<c02b54b4>] ext4_file_write+0x54/0x2a0
Oct 13 22:03:43 localhost kernel: [185521.096563] [<c0189e42>] ? futex_wait+0x1c2/0x280
Oct 13 22:03:43 localhost kernel: [185521.096567] [<c02322f4>] do_sync_write+0xa4/0xe0
Oct 13 22:03:43 localhost kernel: [185521.096570] [<c023272c>] ? rw_verify_area+0x6c/0x130
Oct 13 22:03:43 localhost kernel: [185521.096574] [<c0232ab2>] vfs_write+0xa2/0x170
Oct 13 22:03:43 localhost kernel: [185521.096576] [<c0232250>] ? do_sync_write+0x0/0xe0
Oct 13 22:03:43 localhost kernel: [185521.096579] [<c0232d92>] sys_write+0x42/0x70
Oct 13 22:03:43 localhost kernel: [185521.096582] [<c0637754>] syscall_call+0x7/0xb
Oct 13 22:03:43 localhost kernel: [185521.096586] INFO: task java:11632 blocked for more than 120 seconds.
Oct 13 22:03:43 localhost kernel: [185521.096593] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Oct 13 22:03:43 localhost kernel: [185521.096601] java D e9921480 0 11632 1 0x00000000
Oct 13 22:03:43 localhost kernel: [185521.096605] eb12bc68 00000286 c06373d9 e9921480 eb12bbfc c01770a1 e98b4e4c c097f680
Oct 13 22:03:43 localhost kernel: [185521.096611] b4f8677b 0000a89b e98b4e48 c097f680 c097f680 ec696680 e98b4bc0 e9a43f20
Oct 13 22:03:43 localhost kernel: [185521.096617] c0243d55 00000000 68de56ac 00000001 c0242c70 0000001c 00000200 e98b4bc0
Oct 13 22:03:43 localhost kernel: [185521.096623] Call Trace:
Oct 13 22:03:43 localhost kernel: [185521.096626] [<c06373d9>] ? _raw_spin_unlock_irqrestore+0x19/0x20
Oct 13 22:03:43 localhost kernel: [185521.096629] [<c01770a1>] ? remove_wait_queue+0x41/0x50
Oct 13 22:03:43 localhost kernel: [185521.096633] [<c0243d55>] ? do_sys_poll+0x145/0x1e0
Oct 13 22:03:43 localhost kernel: [185521.096637] [<c0242c70>] ? __pollwait+0x0/0xd0
Oct 13 22:03:43 localhost kernel: [185521.096640] [<c010721e>] ? __raw_callee_save_xen_restore_fl+0x6/0x8
Oct 13 22:03:43 localhost kernel: [185521.096643] [<c06373d9>] ? _raw_spin_unlock_irqrestore+0x19/0x20
Oct 13 22:03:43 localhost kernel: [185521.096646] [<c0177038>] ? prepare_to_wait+0x48/0x70
Oct 13 22:03:43 localhost kernel: [185521.096650] [<c02f5ca5>] do_get_write_access+0x235/0x3f0
Oct 13 22:03:43 localhost kernel: [185521.096653] [<c025aa64>] ? __find_get_block+0xb4/0xe0
Oct 13 22:03:43 localhost kernel: [185521.096656] [<c0176e20>] ? wake_bit_function+0x0/0x60
Oct 13 22:03:43 localhost kernel: [185521.096659] [<c02f478d>] ? start_this_handle.clone.5+0x39d/0x420
Oct 13 22:03:43 localhost kernel: [185521.096663] [<c02f5f68>] jbd2_journal_get_write_access+0x28/0x40
Oct 13 22:03:43 localhost kernel: [185521.096666] [<c02de97f>] __ext4_journal_get_write_access+0x2f/0x80
Oct 13 22:03:43 localhost kernel: [185521.096670] [<c02bbef7>] ext4_reserve_inode_write+0x67/0x80
Oct 13 22:03:43 localhost kernel: [185521.096673] [<c02bbf4c>] ext4_mark_inode_dirty+0x3c/0x1c0
Oct 13 22:03:43 localhost kernel: [185521.096677] [<c02d3423>] ? ext4_journal_start_sb+0x93/0x110
Oct 13 22:03:43 localhost kernel: [185521.096680] [<c02c0b51>] ? ext4_dirty_inode+0x31/0x50
Oct 13 22:03:43 localhost kernel: [185521.096684] [<c02c0b51>] ext4_dirty_inode+0x31/0x50
Oct 13 22:03:43 localhost kernel: [185521.096687] [<c0253ed9>] __mark_inode_dirty+0x29/0x1d0
Oct 13 22:03:43 localhost kernel: [185521.096690] [<c03275d4>] ? security_inode_need_killpriv+0x14/0x20
Oct 13 22:03:43 localhost kernel: [185521.096693] [<c01eb644>] ? file_remove_suid+0x24/0x80
Oct 13 22:03:43 localhost kernel: [185521.096696] [<c0249741>] file_update_time+0xc1/0x140
Oct 13 22:03:43 localhost kernel: [185521.096699] [<c01ed478>] __generic_file_aio_write+0x1e8/0x4e0
Oct 13 22:03:43 localhost kernel: [185521.096702] [<c0104bb0>] ? xen_mc_flush+0x90/0x1b0
Oct 13 22:03:43 localhost kernel: [185521.096706] [<c01ed7ce>] generic_file_aio_write+0x5e/0xd0
Oct 13 22:03:43 localhost kernel: [185521.096709] [<c02b54b4>] ext4_file_write+0x54/0x2a0
Oct 13 22:03:43 localhost kernel: [185521.096712] [<c010721e>] ? __raw_callee_save_xen_restore_fl+0x6/0x8
Oct 13 22:03:43 localhost kernel: [185521.096716] [<c0225ce8>] ? kmem_cache_free+0x68/0xd0
Oct 13 22:03:43 localhost kernel: [185521.096719] [<c0225ce8>] ? kmem_cache_free+0x68/0xd0
Oct 13 22:03:43 localhost kernel: [185521.096722] [<c024443f>] ? __d_free+0x2f/0x50
Oct 13 22:03:43 localhost kernel: [185521.096725] [<c02322f4>] do_sync_write+0xa4/0xe0
Oct 13 22:03:43 localhost kernel: [185521.096728] [<c023272c>] ? rw_verify_area+0x6c/0x130
Oct 13 22:03:43 localhost kernel: [185521.096731] [<c0232ab2>] vfs_write+0xa2/0x170
Oct 13 22:03:43 localhost kernel: [185521.096736] [<c0232250>] ? do_sync_write+0x0/0xe0
Oct 13 22:03:43 localhost kernel: [185521.096739] [<c0232d92>] sys_write+0x42/0x70
Oct 13 22:03:43 localhost kernel: [185521.096742] [<c0637754>] syscall_call+0x7/0xb
Oct 13 22:03:43 localhost kernel: [185521.096745] INFO: task java:11633 blocked for more than 120 seconds.
Oct 13 22:03:43 localhost kernel: [185521.096752] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Oct 13 22:03:43 localhost kernel: [185521.096761] java D 00200200 0 11633 1 0x00000000
Oct 13 22:03:43 localhost kernel: [185521.096765] c10bfce0 00000286 00100100 00200200 e9921140 c117ad90 eb85a86c c097f680
Oct 13 22:03:43 localhost kernel: [185521.096771] 3fa48480 0000a89e eb85a868 c097f680 c097f680 ec696680 eb85a5e0 c086cf60
Oct 13 22:03:43 localhost kernel: [185521.096777] 80000001 5501a067 eb078200 b77b2000 00000000 00000000 00000200 eb85a5e0
Oct 13 22:03:43 localhost kernel: [185521.096783] Call Trace:
Oct 13 22:03:43 localhost kernel: [185521.096786] [<c010721e>] ? __raw_callee_save_xen_restore_fl+0x6/0x8
Oct 13 22:03:43 localhost kernel: [185521.096790] [<c06373d9>] ? _raw_spin_unlock_irqrestore+0x19/0x20
Oct 13 22:03:43 localhost kernel: [185521.096793] [<c0177038>] ? prepare_to_wait+0x48/0x70
Oct 13 22:03:43 localhost kernel: [185521.096796] [<c02f5ca5>] do_get_write_access+0x235/0x3f0
Oct 13 22:03:43 localhost kernel: [185521.096800] [<c025aa64>] ? __find_get_block+0xb4/0xe0
Oct 13 22:03:43 localhost kernel: [185521.096803] [<c0176e20>] ? wake_bit_function+0x0/0x60
Oct 13 22:03:43 localhost kernel: [185521.096806] [<c02f478d>] ? start_this_handle.clone.5+0x39d/0x420
Oct 13 22:03:43 localhost kernel: [185521.096811] [<c054e1e4>] ? sk_reset_timer+0x14/0x20
Oct 13 22:03:43 localhost kernel: [185521.096814] [<c02f5f68>] jbd2_journal_get_write_access+0x28/0x40
Oct 13 22:03:43 localhost kernel: [185521.096818] [<c02de97f>] __ext4_journal_get_write_access+0x2f/0x80
Oct 13 22:03:43 localhost kernel: [185521.096822] [<c02bbef7>] ext4_reserve_inode_write+0x67/0x80
Oct 13 22:03:43 localhost kernel: [185521.096825] [<c02bbf4c>] ext4_mark_inode_dirty+0x3c/0x1c0
Oct 13 22:03:43 localhost kernel: [185521.096829] [<c02d3423>] ? ext4_journal_start_sb+0x93/0x110
Oct 13 22:03:43 localhost kernel: [185521.096832] [<c02c0b51>] ? ext4_dirty_inode+0x31/0x50
Oct 13 22:03:43 localhost kernel: [185521.096836] [<c02c0b51>] ext4_dirty_inode+0x31/0x50
Oct 13 22:03:43 localhost kernel: [185521.096839] [<c0253ed9>] __mark_inode_dirty+0x29/0x1d0
Oct 13 22:03:43 localhost kernel: [185521.096842] [<c025b4ec>] ? __set_page_dirty+0x6c/0xc0
Oct 13 22:03:43 localhost kernel: [185521.096845] [<c0249741>] file_update_time+0xc1/0x140
Oct 13 22:03:43 localhost kernel: [185521.096848] [<c0208d1f>] do_wp_page+0x12f/0x820
Oct 13 22:03:43 localhost kernel: [185521.096851] [<c020b276>] handle_pte_fault+0x296/0x2f0
Oct 13 22:03:43 localhost kernel: [185521.096855] [<c0105a64>] ? pte_mfn_to_pfn+0xa4/0xc0
Oct 13 22:03:43 localhost kernel: [185521.096858] [<c020bf39>] handle_mm_fault+0x109/0x1b0
Oct 13 22:03:43 localhost kernel: [185521.096861] [<c063aad0>] ? do_page_fault+0x0/0x490
Oct 13 22:03:43 localhost kernel: [185521.096864] [<c063ac2e>] do_page_fault+0x15e/0x490
Oct 13 22:03:43 localhost kernel: [185521.096868] [<c01078b8>] ? xen_clocksource_get_cycles+0x8/0x10
Oct 13 22:03:43 localhost kernel: [185521.096871] [<c01818b0>] ? getnstimeofday+0x50/0x130
Oct 13 22:03:43 localhost kernel: [185521.096875] [<c0387d32>] ? copy_to_user+0x42/0x60
Oct 13 22:03:43 localhost kernel: [185521.096879] [<c015e372>] ? sys_gettimeofday+0x32/0x70
Oct 13 22:03:43 localhost kernel: [185521.096882] [<c063aad0>] ? do_page_fault+0x0/0x490
Oct 13 22:03:43 localhost kernel: [185521.096885] [<c0637e3f>] error_code+0x67/0x6c
Oct 13 22:05:43 localhost kernel: [185641.096048] INFO: task jbd2/xvda1-8:136 blocked for more than 120 seconds.
Oct 13 22:05:43 localhost kernel: [185641.096067] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Oct 13 22:05:43 localhost kernel: [185641.096077] jbd2/xvda1-8 D eb35fe18 0 136 2 0x00000000
Oct 13 22:05:43 localhost kernel: [185641.096083] eb35fe60 00000246 eb1b09b8 eb35fe18 c0135b80 44bcee4c eb3141ac c097f680
Oct 13 22:05:43 localhost kernel: [185641.096089] 3b71d7cd 0000a892 eb3141a8 c097f680 c097f680 ec696680 eb313f20 e9a40000
Oct 13 22:05:43 localhost kernel: [185641.096095] c08c6f80 0187099e eb35fe20 c01077d9 eb35fe28 eb1b09b8 eb35fe58 c0181af8
Oct 13 22:05:43 localhost kernel: [185641.096102] Call Trace:
Oct 13 22:05:43 localhost kernel: [185641.096112] [<c0135b80>] ? pvclock_clocksource_read+0xa0/0x110
Oct 13 22:05:43 localhost kernel: [185641.096117] [<c01077d9>] ? xen_clocksource_read+0x19/0x20
Oct 13 22:05:43 localhost kernel: [185641.096122] [<c0181af8>] ? ktime_get_ts+0xf8/0x120
Oct 13 22:05:43 localhost kernel: [185641.096128] [<c06355af>] io_schedule+0x5f/0xa0
Oct 13 22:05:43 localhost kernel: [185641.096133] [<c0259c58>] sync_buffer+0x38/0x40
Oct 13 22:05:43 localhost kernel: [185641.096136] [<c0635dad>] __wait_on_bit+0x4d/0x70
Oct 13 22:05:43 localhost kernel: [185641.096140] [<c0259c20>] ? sync_buffer+0x0/0x40
Oct 13 22:05:43 localhost kernel: [185641.096143] [<c0259c20>] ? sync_buffer+0x0/0x40
Oct 13 22:05:43 localhost kernel: [185641.096146] [<c0635e31>] out_of_line_wait_on_bit+0x61/0x70
Oct 13 22:05:43 localhost kernel: [185641.096151] [<c0176e20>] ? wake_bit_function+0x0/0x60
Oct 13 22:05:43 localhost kernel: [185641.096154] [<c0259c1e>] __wait_on_buffer+0x2e/0x30
Oct 13 22:05:43 localhost kernel: [185641.096159] [<c02f6d6b>] jbd2_journal_commit_transaction+0x4cb/0xf30
Oct 13 22:05:43 localhost kernel: [185641.096163] [<c06373d9>] ? _raw_spin_unlock_irqrestore+0x19/0x20
Oct 13 22:05:43 localhost kernel: [185641.096167] [<c0167637>] ? try_to_del_timer_sync+0x67/0xb0
Oct 13 22:05:43 localhost kernel: [185641.096171] [<c02fb2fe>] kjournald2+0x8e/0x1c0
Oct 13 22:05:43 localhost kernel: [185641.096174] [<c0176dd0>] ? autoremove_wake_function+0x0/0x50
Oct 13 22:05:43 localhost kernel: [185641.096177] [<c02fb270>] ? kjournald2+0x0/0x1c0
Oct 13 22:05:43 localhost kernel: [185641.096180] [<c0176864>] kthread+0x74/0x80
Oct 13 22:05:43 localhost kernel: [185641.096183] [<c01767f0>] ? kthread+0x0/0x80
Oct 13 22:05:43 localhost kernel: [185641.096187] [<c010b0fe>] kernel_thread_helper+0x6/0x10
Oct 13 22:05:43 localhost kernel: [185641.096194] INFO: task java:11610 blocked for more than 120 seconds.
<a few more logs cut due to size limits>