I was getting a similar error (io_schedule/sync_buffer, filesystem unusably slow) on a c1.medium EC2 instance. I removed irqbalanced and rebooting and quickly crashed like this:
[ 480.722484] INFO: task apache2:822 blocked for more than 120 seconds. [ 480.722498] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 480.722505] apache2 D 00004000 0 822 762 0x00000000 [ 480.722510] ec1a9e58 00000282 00000000 00004000 c055ac00 00000000 00031ab5 00000000 [ 480.722517] c06ea1c0 ec20b2ec c06ea1c0 c06ea1c0 c06ea1c0 ec20b2ec c06ea1c0 c06ea1c0 [ 480.722522] ebcb5040 00000041 ec20b040 ec844d00 c1ceaa64 00000000 ec1a9e3c 00000000 [ 480.722532] Call Trace: [ 480.722542] [<c05297b4>] __mutex_lock_slowpath+0xd4/0x140 [ 480.722559] [<c0529619>] mutex_lock+0x19/0x30 [ 480.722564] [<c019801f>] generic_file_aio_write+0x3f/0xb0 [ 480.722568] [<c01cdb0c>] do_sync_write+0xbc/0x100 [ 480.722573] [<c014c5c0>] ? autoremove_wake_function+0x0/0x40 [ 480.722579] [<c0393f3f>] ? security_file_permission+0xf/0x20 [ 480.722582] [<c01cdcad>] ? rw_verify_area+0x5d/0xd0 [ 480.722585] [<c01cddba>] vfs_write+0x9a/0x190 [ 480.722587] [<c01cda50>] ? do_sync_write+0x0/0x100 [ 480.722590] [<c01ce7dd>] sys_write+0x3d/0x70 [ 480.722593] [<c01047e0>] syscall_call+0x7/0xb -- 10.04 LTS Servers Hang with task kjournald blocked for more than 120 seconds https://bugs.launchpad.net/bugs/628530 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
