Comment 4 for bug 758384

Looking slightly further in syslog, after a number of repetitions of the above messages, I see the following:

Apr 12 19:45:53 madrid kernel: [ 4080.932059] INFO: task jbd2/sda1-8:203 blocked for more than 120 seconds.
Apr 12 19:45:53 madrid kernel: [ 4080.932072] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Apr 12 19:45:53 madrid kernel: [ 4080.932081] jbd2/sda1-8 D f6c9c000 0 203 2 0x00000000
Apr 12 19:45:53 madrid kernel: [ 4080.932099] f6ca9dc8 00000046 00000000 f6c9c000 f307c740 f6c9c000 f37f742c c183a8c0
Apr 12 19:45:53 madrid kernel: [ 4080.932123] 0dfc8bab 00000385 f37f7428 c183a8c0 c183a8c0 f5e068c0 f37f71a0 f50b0000
Apr 12 19:45:53 madrid kernel: [ 4080.932146] f6ca9d84 00000296 f37f71a0 f6ca9db8 c10b6786 f6df2238 f6ca9dc0 c1078088
Apr 12 19:45:53 madrid kernel: [ 4080.932169] Call Trace:
Apr 12 19:45:53 madrid kernel: [ 4080.932196] [<c10b6786>] ? delayacct_end+0x96/0xb0
Apr 12 19:45:53 madrid kernel: [ 4080.932214] [<c1078088>] ? ktime_get_ts+0xf8/0x120
Apr 12 19:45:53 madrid kernel: [ 4080.932231] [<c1507a4f>] io_schedule+0x5f/0xa0
Apr 12 19:45:53 madrid kernel: [ 4080.932243] [<c10e1d3a>] sync_page+0x3a/0x50
Apr 12 19:45:53 madrid kernel: [ 4080.932255] [<c150824d>] __wait_on_bit+0x4d/0x70
Apr 12 19:45:53 madrid kernel: [ 4080.932266] [<c10e1d00>] ? sync_page+0x0/0x50
Apr 12 19:45:53 madrid kernel: [ 4080.932277] [<c10e1ee5>] wait_on_page_bit+0x85/0x90
Apr 12 19:45:53 madrid kernel: [ 4080.932291] [<c106d3c0>] ? wake_bit_function+0x0/0x60
Apr 12 19:45:53 madrid kernel: [ 4080.932303] [<c10e1fcb>] filemap_fdatawait_range+0xdb/0x160
Apr 12 19:45:53 madrid kernel: [ 4080.932318] [<c125cc9e>] ? submit_bio+0x6e/0x100
Apr 12 19:45:53 madrid kernel: [ 4080.932333] [<c11ea70c>] ? jbd2_journal_file_buffer+0x4c/0x80
Apr 12 19:45:53 madrid kernel: [ 4080.932346] [<c10e2f97>] filemap_fdatawait+0x57/0x70
Apr 12 19:45:53 madrid kernel: [ 4080.932358] [<c11eadc7>] journal_finish_inode_data_buffers+0x57/0x130
Apr 12 19:45:53 madrid kernel: [ 4080.932371] [<c11eb2f2>] jbd2_journal_commit_transaction+0x452/0xf30
Apr 12 19:45:53 madrid kernel: [ 4080.932388] [<c102d8c8>] ? default_spin_lock_flags+0x8/0x10
Apr 12 19:45:53 madrid kernel: [ 4080.932402] [<c105dc07>] ? try_to_del_timer_sync+0x67/0xb0
Apr 12 19:45:53 madrid kernel: [ 4080.932417] [<c11ef8fe>] kjournald2+0x8e/0x1c0
Apr 12 19:45:53 madrid kernel: [ 4080.932429] [<c106d370>] ? autoremove_wake_function+0x0/0x50
Apr 12 19:45:53 madrid kernel: [ 4080.932442] [<c11ef870>] ? kjournald2+0x0/0x1c0
Apr 12 19:45:53 madrid kernel: [ 4080.932454] [<c106ce04>] kthread+0x74/0x80
Apr 12 19:45:53 madrid kernel: [ 4080.932465] [<c106cd90>] ? kthread+0x0/0x80
Apr 12 19:45:53 madrid kernel: [ 4080.932478] [<c100367e>] kernel_thread_helper+0x6/0x10