>> On May 20, 2014, at 12:10 PM, Thomas Meyer <tho...@m3y3r.de> wrote: >> >> I still run into this error, too! >> >> My previous statement that this issue is fixed was wrong. >> >> With kind regards >> Thomas >> >> Am 20.05.2014 16:32 schrieb Jonathan Rudenberg <jonat...@titanous.com>: >>> >>> On 2014-03-16, 11:09 AM, Richard Weinberger wrote: >>>> Am 14.03.2014 15:57, schrieb Thomas Meyer: >>>>> >>>>> only some processes get stuck. >>>>> >>>>> After enabling hung task detection in the kernel I see this in the logs: >>>>> >>>>> [ 8040.100000] INFO: task jbd2/ubda-8:308 blocked for more than 120 >>>>> seconds. >>> ... >>>>> >>>>> any ideas? some synchronisation error in ext4? >>>> >>>> Hmm, maybe you suffer from the same issue this patch tries to address: >>>> https://lkml.org/lkml/2014/2/14/733 >>> >>> I'm running into a very similar issue on vanilla 3.14.4 and 3.15-rc5, >>> both appear to have that patch already applied. >>> >>> I've tested ext4, ext3, btrfs, all with the same issue: processes >>> writing to disk in the guest randomly hang permanently after a few >>> minutes of uptime. The guest reports 100% iowait, the host has no load >>> and is totally fine. >>> >>> Any suggestions would be appreciated. >>> >>> Thanks, >>> >>> Jonathan >>> >>> >>> INFO: task jbd2/ubda-8:347 blocked for more than 120 seconds. >>> Not tainted 3.14.4 #5 >>> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. >>> jbd2/ubda-8 D 000000000042fc13 0 347 2 0x00000000 >>> Stack: >>> 60538e60 7fb14820 8044dba0 80d2a4d0 >>> 7fa5a480 60021e1f 60038290 6007db40 >>> 80d2a1c0 6042adf2 00000000 6006d120 >>> Call Trace: >>> [<60021e1f>] ? __switch_to+0x4f/0x90 >>> [<60038290>] ? block_signals+0x0/0x20 >>> [<6007db40>] ? rcu_sched_qs+0x0/0xb0 >>> [<6042adf2>] ? __schedule+0x1c2/0x510 >>> [<6006d120>] ? pick_next_task_fair+0x0/0x190 >>> [<60119d50>] ? sleep_on_buffer+0x0/0x20 >>> [<60023340>] ? itimer_read+0x10/0x40 >>> [<60119d50>] ? sleep_on_buffer+0x0/0x20 >>> [<6042b173>] ? schedule+0x33/0x80 >>> [<60234023>] ? submit_bio+0xa3/0x1d0 >>> [<6042b692>] ? io_schedule+0xb2/0x130 >>> [<6006fc00>] ? prepare_to_wait+0x0/0x90 >>> [<60119d60>] ? sleep_on_buffer+0x10/0x20 >>> [<6042b8b0>] ? __wait_on_bit+0x60/0xa0 >>> [<60119d50>] ? sleep_on_buffer+0x0/0x20 >>> [<6042ba2b>] ? out_of_line_wait_on_bit+0x8b/0xa0 >>> [<601d1061>] ? journal_submit_commit_record.isra.25+0x181/0x240 >>> [<6006f940>] ? wake_bit_function+0x0/0x40 >>> [<6011b090>] ? __brelse+0x0/0x20 >>> [<6011b090>] ? __brelse+0x0/0x20 >>> [<6042b350>] ? _cond_resched+0x0/0x50 >>> [<601d25a1>] ? jbd2_journal_commit_transaction+0x1481/0x1770 >>> [<60038290>] ? block_signals+0x0/0x20 >>> [<6004cb1f>] ? lock_timer_base.isra.37+0x3f/0x80 >>> [<6004d6f0>] ? del_timer+0x0/0x60 >>> [<6006fae0>] ? __wake_up+0x0/0x60 >>> [<601d5b74>] ? kjournald2+0xd4/0x2b0 >>> [<6042ae0b>] ? __schedule+0x1db/0x510 >>> [<6006d120>] ? pick_next_task_fair+0x0/0x190 >>> [<6006f900>] ? autoremove_wake_function+0x0/0x40 >>> [<6006f9b0>] ? __init_waitqueue_head+0x0/0x10 >>> [<601d5aa0>] ? kjournald2+0x0/0x2b0 >>> [<6006f9b0>] ? __init_waitqueue_head+0x0/0x10 >>> [<600609ef>] ? kthread+0x10f/0x140 >>> [<6006817d>] ? finish_task_switch.isra.78+0x2d/0x90 >>> [<60069612>] ? schedule_tail+0x22/0xd0 >>> [<60021c02>] ? new_thread_handler+0x82/0xb0 >>> >>> INFO: task git:1150 blocked for more than 120 seconds. >>> Not tainted 3.14.4 #5 >>> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. >>> git D 000000000042fc13 0 1150 1146 0x00000000 >>> Stack: >>> 60538e60 6052b1e0 7e801ce0 7fb9b750 >>> 807ddc00 60021e1f 60038290 6007db40 >>> 7fb9b440 6042adf2 604324c0 6006d120 >>> Call Trace: >>> [<60021e1f>] ? __switch_to+0x4f/0x90 >>> [<60038290>] ? block_signals+0x0/0x20 >>> [<6007db40>] ? rcu_sched_qs+0x0/0xb0 >>> [<6042adf2>] ? __schedule+0x1c2/0x510 >>> [<6006d120>] ? pick_next_task_fair+0x0/0x190 >>> [<600385dc>] ? set_signals+0x3c/0x50 >>> [<6006fd20>] ? prepare_to_wait_event+0x0/0x110 >>> [<6042b140>] ? schedule+0x0/0x80 >>> [<6042b173>] ? schedule+0x33/0x80 >>> [<601d6693>] ? jbd2_log_wait_commit+0x93/0x100 >>> [<6006f900>] ? autoremove_wake_function+0x0/0x40 >>> [<6018b942>] ? ext4_sync_file+0x282/0x310 >>> [<601187aa>] ? do_fsync+0x4a/0x80 >>> [<60118b12>] ? SyS_fsync+0x12/0x20 >>> [<600256a0>] ? handle_syscall+0x60/0x80 >>> [<6003be9b>] ? userspace+0x49b/0x5a0 >>> [<600256f0>] ? copy_chunk_to_user+0x0/0x30 >>> [<60025985>] ? do_op_one_page+0x145/0x210 >>> [<60025c71>] ? copy_to_user+0x61/0xb0 >>> [<60036f5f>] ? save_registers+0x1f/0x40 >>> [<6003ec40>] ? arch_prctl+0x190/0x1c0 >>> [<60021cb5>] ? fork_handler+0x85/0x90 >>> >>> $ ps -eo pid,user,wchan=WIDE-WCHAN-COLUMN0000000000000 -o s,cmd >>> PID USER WIDE-WCHAN-COLUMN0000000000000 S CMD >>> 1 root pick_next_task_fair S /sbin/init >>> 2 root pick_next_task_fair S [kthreadd] >>> 3 root pick_next_task_fair S [ksoftirqd/0] >>> 4 root pick_next_task_fair S [kworker/0:0] >>> 5 root pick_next_task_fair S [kworker/0:0H] >>> 6 root pick_next_task_fair S [kworker/u2:0] >>> 7 root pick_next_task_fair S [watchdog/0] >>> 8 root pick_next_task_fair S [khelper] >>> 9 root pick_next_task_fair S [kdevtmpfs] >>> 10 root pick_next_task_fair S [netns] >>> 91 root pick_next_task_fair S [writeback] >>> 93 root pick_next_task_fair S [bioset] >>> 95 root pick_next_task_fair S [kblockd] >>> 113 root pick_next_task_fair S [kworker/0:1] >>> 123 root pick_next_task_fair S [khungtaskd] >>> 124 root pick_next_task_fair S [kswapd0] >>> 125 root pick_next_task_fair S [fsnotify_mark] >>> 249 root pick_next_task_fair S [ipv6_addrconf] >>> 346 root pick_next_task_fair S [deferwq] >>> 347 root pick_next_task_fair D [jbd2/ubda-8] >>> 348 root pick_next_task_fair S [ext4-rsv-conver] >>> 366 root pick_next_task_fair S [kworker/0:1H] >>> 468 root pick_next_task_fair S upstart-udev-bridge >>> 472 root pick_next_task_fair S /lib/systemd >>> 741 root pick_next_task_fair S [jbd2/ubdb-8] >>> 742 root pick_next_task_fair S [ext4-rsv-conver] >>> 890 root pick_next_task_fair S /usr/bin/docker -d >>> 967 syslog pick_next_task_fair S rsyslogd >>> 1006 root pick_next_task_fair S [kworker/u2:2] >>> 1036 root pick_next_task_fair S /sbin/getty -8 38400 >>> 1037 root pick_next_task_fair S /sbin/getty -8 38400 >>> 1040 root pick_next_task_fair S /sbin/getty -8 38400 >>> 1041 root pick_next_task_fair S /bin/login -- >>> 1043 root pick_next_task_fair S /sbin/getty -8 38400 >>> 1089 root pick_next_task_fair S /usr/sbin/sshd -D >>> 1090 root pick_next_task_fair S cron >>> 1092 root pick_next_task_fair S sshd: ubuntu [priv] >>> 1096 root pick_next_task_fair S [kauditd] >>> 1106 ubuntu pick_next_task_fair S sshd: ubuntu@notty >>> 1107 ubuntu pick_next_task_fair S bash >>> 1112 root pick_next_task_fair S /sbin/getty -8 38400 >>> 1132 root pick_next_task_fair S upstart-socket-bridge >>> 1133 root pick_next_task_fair S upstart-file-bridge >>> 1138 ubuntu pick_next_task_fair S /bin/bash >>> 1141 ubuntu pick_next_task_fair S git clone >>> 1142 ubuntu pick_next_task_fair S git-remote-https origin >>> 1146 ubuntu pick_next_task_fair S git fetch-pack >>> 1150 ubuntu pick_next_task_fair D git index-pack --stdin >>> 1160 ubuntu pick_next_task_fair S -bash >
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