Comment 2 for bug 494476

hi there,

here are two new tasks blocking for more than 120 seconds. but this time the task "kjournald2" followed dy "rsync" are affected. this happens when i tried to copy from one ext4 volume to an other with rsync.
So its not samba - specific as i assumed at first let me say it seems to be a problem with ext4.

Since i converted two of my volumes from ext3 to ext4 in the last week i got this problems.
So i have to go back to ext3 to avoid loosing of data.

Dec 10 22:48:36 MeinFileServer kernel: [36480.412032] INFO: task kjournald2:1064 blocked for more than 120 seconds.
Dec 10 22:48:36 MeinFileServer kernel: [36480.412036] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec 10 22:48:36 MeinFileServer kernel: [36480.412038] kjournald2 D c08145c0 0 1064 2 0x00000000
Dec 10 22:48:36 MeinFileServer kernel: [36480.412042] e5983ec0 00000046 5b337856 c08145c0 f69f2848 c08145c0 c477cdf8 000020fc
Dec 10 22:48:36 MeinFileServer kernel: [36480.412047] c08145c0 c08145c0 f69f2848 c08145c0 c477c209 000020fc c08145c0 e42b9180
Dec 10 22:48:36 MeinFileServer kernel: [36480.412052] f69f25b0 e5983f50 f646c478 e5983f44 e5983f74 c029a551 e5983ee4 c03154d4
Dec 10 22:48:36 MeinFileServer kernel: [36480.412057] Call Trace:
Dec 10 22:48:36 MeinFileServer kernel: [36480.412064] [<c029a551>] jbd2_journal_commit_transaction+0x161/0xe80
Dec 10 22:48:36 MeinFileServer kernel: [36480.412069] [<c03154d4>] ? rb_erase+0xb4/0x120
Dec 10 22:48:36 MeinFileServer kernel: [36480.412074] [<c01332b1>] ? __dequeue_entity+0x21/0x40
Dec 10 22:48:36 MeinFileServer kernel: [36480.412077] [<c0150417>] ? lock_timer_base+0x27/0x50
Dec 10 22:48:36 MeinFileServer kernel: [36480.412080] [<c015c280>] ? autoremove_wake_function+0x0/0x40
Dec 10 22:48:36 MeinFileServer kernel: [36480.412082] [<c0150485>] ? try_to_del_timer_sync+0x45/0x50
Dec 10 22:48:36 MeinFileServer kernel: [36480.412086] [<c029f9ee>] kjournald2+0xce/0x200
Dec 10 22:48:36 MeinFileServer kernel: [36480.412088] [<c015c280>] ? autoremove_wake_function+0x0/0x40
Dec 10 22:48:36 MeinFileServer kernel: [36480.412091] [<c029f920>] ? kjournald2+0x0/0x200
Dec 10 22:48:36 MeinFileServer kernel: [36480.412094] [<c015bf8c>] kthread+0x7c/0x90
Dec 10 22:48:36 MeinFileServer kernel: [36480.412096] [<c015bf10>] ? kthread+0x0/0x90
Dec 10 22:48:36 MeinFileServer kernel: [36480.412099] [<c0104007>] kernel_thread_helper+0x7/0x10
Dec 10 22:48:36 MeinFileServer kernel: [36480.412117] INFO: task rsync:14130 blocked for more than 120 seconds.
Dec 10 22:48:36 MeinFileServer kernel: [36480.412118] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec 10 22:48:36 MeinFileServer kernel: [36480.412120] rsync D c08145c0 0 14130 14129 0x00000000
Dec 10 22:48:36 MeinFileServer kernel: [36480.412123] dd297ba0 00200086 dd2d2000 c08145c0 f6abc168 c08145c0 61295f12 000020fc
Dec 10 22:48:36 MeinFileServer kernel: [36480.412128] c08145c0 c08145c0 f6abc168 c08145c0 00000000 000020fc c08145c0 f641ddc0
Dec 10 22:48:36 MeinFileServer kernel: [36480.412133] f6abbed0 dd297bd4 f6abbed0 c87cc508 dd297bcc c0570b75 fffeffff 00000304
Dec 10 22:48:36 MeinFileServer kernel: [36480.412137] Call Trace:
Dec 10 22:48:36 MeinFileServer kernel: [36480.412141] [<c0570b75>] rwsem_down_failed_common+0x75/0x1a0
Dec 10 22:48:36 MeinFileServer kernel: [36480.412144] [<c0570ced>] rwsem_down_read_failed+0x1d/0x30
Dec 10 22:48:36 MeinFileServer kernel: [36480.412147] [<c0570d47>] call_rwsem_down_read_failed+0x7/0x10
Dec 10 22:48:36 MeinFileServer kernel: [36480.412149] [<c0570307>] ? down_read+0x17/0x20
Dec 10 22:48:36 MeinFileServer kernel: [36480.412153] [<c026577a>] ext4_get_blocks+0x3a/0x200
Dec 10 22:48:36 MeinFileServer kernel: [36480.412156] [<c02085c0>] ? alloc_buffer_head+0x10/0x40
Dec 10 22:48:36 MeinFileServer kernel: [36480.412158] [<c02659ca>] ext4_da_get_block_prep+0x8a/0x120
Dec 10 22:48:36 MeinFileServer kernel: [36480.412162] [<c020b86a>] __block_prepare_write+0x14a/0x3a0
Dec 10 22:48:36 MeinFileServer kernel: [36480.412165] [<c01b3114>] ? add_to_page_cache_lru+0x44/0x70
Dec 10 22:48:36 MeinFileServer kernel: [36480.412168] [<c020bc6e>] block_write_begin+0x4e/0xe0
Dec 10 22:48:36 MeinFileServer kernel: [36480.412170] [<c0265940>] ? ext4_da_get_block_prep+0x0/0x120
Dec 10 22:48:36 MeinFileServer kernel: [36480.412173] [<c0268c18>] ext4_da_write_begin+0x168/0x300
Dec 10 22:48:36 MeinFileServer kernel: [36480.412175] [<c0265940>] ? ext4_da_get_block_prep+0x0/0x120
Dec 10 22:48:36 MeinFileServer kernel: [36480.412178] [<c01b26c9>] generic_perform_write+0xa9/0x190
Dec 10 22:48:36 MeinFileServer kernel: [36480.412181] [<c01b33fd>] generic_file_buffered_write+0x5d/0x150
Dec 10 22:48:36 MeinFileServer kernel: [36480.412184] [<c050cfca>] ? unix_stream_recvmsg+0x1aa/0x440
Dec 10 22:48:36 MeinFileServer kernel: [36480.412187] [<c01b4da3>] __generic_file_aio_write_nolock+0x1f3/0x510
Dec 10 22:48:36 MeinFileServer kernel: [36480.412190] [<c0487090>] ? apparmor_socket_recvmsg+0x10/0x20
Dec 10 22:48:36 MeinFileServer kernel: [36480.412193] [<c01b51d9>] generic_file_aio_write+0x59/0xd0
Dec 10 22:48:36 MeinFileServer kernel: [36480.412197] [<c025f6fc>] ext4_file_write+0x4c/0x180
Dec 10 22:48:36 MeinFileServer kernel: [36480.412200] [<c01e765c>] do_sync_write+0xbc/0x100
Dec 10 22:48:36 MeinFileServer kernel: [36480.412203] [<c015c280>] ? autoremove_wake_function+0x0/0x40
Dec 10 22:48:36 MeinFileServer kernel: [36480.412207] [<c02c7fdf>] ? security_file_permission+0xf/0x20
Dec 10 22:48:36 MeinFileServer kernel: [36480.412210] [<c01e77ff>] ? rw_verify_area+0x5f/0xe0
Dec 10 22:48:36 MeinFileServer kernel: [36480.412212] [<c0319334>] ? copy_to_user+0x34/0x120
Dec 10 22:48:36 MeinFileServer kernel: [36480.412215] [<c01e791a>] vfs_write+0x9a/0x190
Dec 10 22:48:36 MeinFileServer kernel: [36480.412217] [<c01e75a0>] ? do_sync_write+0x0/0x100
Dec 10 22:48:36 MeinFileServer kernel: [36480.412220] [<c01e83dd>] sys_write+0x3d/0x70
Dec 10 22:48:36 MeinFileServer kernel: [36480.412222] [<c010336c>] syscall_call+0x7/0xb