List,
I ran into a hang issue (race condition: cpu is high when the server is
idle, meaning that btrfs is hanging, and IOwait is high as well) running
2.6.34 on debian/lenny on a x86_64 server (dual Opteron 275 w/ 16GB ram).
The btrfs filesystem live on 18x300GB scsi spindles, configured as Raid-0,
as shown below:
Label: none uuid: bc6442c6-2fe2-4236-a5aa-6b7841234c52
Total devices 18 FS bytes used 2.94TB
devid 5 size 279.39GB used 208.33GB path /dev/cciss/c1d0
devid 17 size 279.39GB used 208.34GB path /dev/cciss/c1d8
devid 16 size 279.39GB used 209.33GB path /dev/cciss/c1d7
devid 4 size 279.39GB used 208.33GB path /dev/cciss/c0d4
devid 1 size 279.39GB used 233.72GB path /dev/cciss/c0d1
devid 13 size 279.39GB used 208.33GB path /dev/cciss/c1d4
devid 8 size 279.39GB used 208.33GB path /dev/cciss/c1d11
devid 12 size 279.39GB used 208.33GB path /dev/cciss/c1d3
devid 3 size 279.39GB used 208.33GB path /dev/cciss/c0d3
devid 9 size 279.39GB used 208.33GB path /dev/cciss/c1d12
devid 6 size 279.39GB used 208.33GB path /dev/cciss/c1d1
devid 11 size 279.39GB used 208.33GB path /dev/cciss/c1d2
devid 14 size 279.39GB used 208.33GB path /dev/cciss/c1d5
devid 2 size 279.39GB used 233.70GB path /dev/cciss/c0d2
devid 15 size 279.39GB used 209.33GB path /dev/cciss/c1d6
devid 10 size 279.39GB used 208.33GB path /dev/cciss/c1d13
devid 7 size 279.39GB used 208.33GB path /dev/cciss/c1d10
devid 18 size 279.39GB used 208.34GB path /dev/cciss/c1d9
Btrfs v0.19-16-g075587c-dirty
The filesystem, mounted in /mnt/btrfs is hanging, no existing or new
process can access it, however 'df' still displays the disk usage (3TB out
of 5). The disks appear to be physically healthy. Please note that a
significant number of files were placed on this filesystem, between 20 and
30 million files.
The relevant kernel messages are displayed below:
INFO: task btrfs-submit-0:4220 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
btrfs-submit- D 000000010042e12f 0 4220 2 0x00000000
ffff8803e584ac70 0000000000000046 0000000000004000 0000000000011680
ffff8803f7349fd8 ffff8803f7349fd8 ffff8803e584ac70 0000000000011680
0000000000000001 ffff8803ff99d250 ffffffff8149f020 0000000081150ab0
Call Trace:
[<ffffffff813089f3>] ? io_schedule+0x71/0xb1
[<ffffffff811470be>] ? get_request_wait+0xab/0x140
[<ffffffff810406f4>] ? autoremove_wake_function+0x0/0x2e
[<ffffffff81143a4d>] ? elv_rq_merge_ok+0x89/0x97
[<ffffffff8114a245>] ? blk_recount_segments+0x17/0x27
[<ffffffff81147429>] ? __make_request+0x2d6/0x3fc
[<ffffffff81145b16>] ? generic_make_request+0x207/0x268
[<ffffffff81145c12>] ? submit_bio+0x9b/0xa2
[<ffffffffa01aa081>] ? btrfs_requeue_work+0xd7/0xe1 [btrfs]
[<ffffffffa01a5365>] ? run_scheduled_bios+0x297/0x48f [btrfs]
[<ffffffffa01aa687>] ? worker_loop+0x17c/0x452 [btrfs]
[<ffffffffa01aa50b>] ? worker_loop+0x0/0x452 [btrfs]
[<ffffffff81040331>] ? kthread+0x79/0x81
[<ffffffff81003674>] ? kernel_thread_helper+0x4/0x10
[<ffffffff810402b8>] ? kthread+0x0/0x81
[<ffffffff81003670>] ? kernel_thread_helper+0x0/0x10
INFO: task btrfs-transacti:4230 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
btrfs-transac D 000000010042e1cc 0 4230 2 0x00000000
ffff8803e544d300 0000000000000046 0000000000004000 0000000000011680
ffff8803f3531fd8 ffff8803f3531fd8 ffff8803e544d300 0000000000011680
ffff8803fe488240 00000000000004c1 ffff8803ff8d7340 0000000381147502
Call Trace:
[<ffffffff810b4153>] ? sync_buffer+0x0/0x3f
[<ffffffff813089f3>] ? io_schedule+0x71/0xb1
[<ffffffff810b418e>] ? sync_buffer+0x3b/0x3f
[<ffffffff81308fba>] ? __wait_on_bit+0x41/0x70
[<ffffffff810b4153>] ? sync_buffer+0x0/0x3f
[<ffffffff81309054>] ? out_of_line_wait_on_bit+0x6b/0x77
[<ffffffff81040722>] ? wake_bit_function+0x0/0x23
[<ffffffffa0186635>] ? write_dev_supers+0xf3/0x225 [btrfs]
[<ffffffffa018693b>] ? write_all_supers+0x1d4/0x22c [btrfs]
[<ffffffffa01898a1>] ? btrfs_commit_transaction+0x4fe/0x5e1 [btrfs]
[<ffffffff810406f4>] ? autoremove_wake_function+0x0/0x2e
[<ffffffffa0185628>] ? transaction_kthread+0x16b/0x1fd [btrfs]
[<ffffffffa01854bd>] ? transaction_kthread+0x0/0x1fd [btrfs]
[<ffffffff81040331>] ? kthread+0x79/0x81
[<ffffffff81003674>] ? kernel_thread_helper+0x4/0x10
[<ffffffff810402b8>] ? kthread+0x0/0x81
[<ffffffff81003670>] ? kernel_thread_helper+0x0/0x10
INFO: task tar:31615 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
tar D 000000010042dee1 0 31615 4269 0x00000000
ffff8803ffa74d70 0000000000000082 0000000000004000 0000000000011680
ffff88010046dfd8 ffff88010046dfd8 ffff8803ffa74d70 0000000000011680
ffff880361cdd480 0000000161cdd480 ffff8803ff8becf0 0000000200005fff
Call Trace:
[<ffffffff8106d2af>] ? sync_page+0x0/0x45
[<ffffffff813089f3>] ? io_schedule+0x71/0xb1
[<ffffffff8106d2f0>] ? sync_page+0x41/0x45
[<ffffffff81308fba>] ? __wait_on_bit+0x41/0x70
[<ffffffff8106d483>] ? wait_on_page_bit+0x6b/0x71
[<ffffffff81040722>] ? wake_bit_function+0x0/0x23
[<ffffffffa0192917>] ? prepare_pages+0xe0/0x244 [btrfs]
[<ffffffffa017e85a>] ? btrfs_check_data_free_space+0x69/0x206 [btrfs]
[<ffffffffa0192f6a>] ? btrfs_file_write+0x405/0x711 [btrfs]
[<ffffffff811ab83d>] ? tty_write+0x213/0x22e
[<ffffffff810951b8>] ? vfs_write+0xad/0x149
[<ffffffff81095310>] ? sys_write+0x45/0x6e
[<ffffffff810028eb>] ? system_call_fastpath+0x16/0x1b
INFO: task btrfs-submit-0:4220 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
btrfs-submit- D 000000010042e12f 0 4220 2 0x00000000
ffff8803e584ac70 0000000000000046 0000000000004000 0000000000011680
ffff8803f7349fd8 ffff8803f7349fd8 ffff8803e584ac70 0000000000011680
0000000000000001 ffff8803ff99d250 ffffffff8149f020 0000000081150ab0
Call Trace:
[<ffffffff813089f3>] ? io_schedule+0x71/0xb1
[<ffffffff811470be>] ? get_request_wait+0xab/0x140
[<ffffffff810406f4>] ? autoremove_wake_function+0x0/0x2e
[<ffffffff81143a4d>] ? elv_rq_merge_ok+0x89/0x97
[<ffffffff8114a245>] ? blk_recount_segments+0x17/0x27
[<ffffffff81147429>] ? __make_request+0x2d6/0x3fc
[<ffffffff81145b16>] ? generic_make_request+0x207/0x268
[<ffffffff81145c12>] ? submit_bio+0x9b/0xa2
[<ffffffffa01aa081>] ? btrfs_requeue_work+0xd7/0xe1 [btrfs]
[<ffffffffa01a5365>] ? run_scheduled_bios+0x297/0x48f [btrfs]
[<ffffffffa01aa687>] ? worker_loop+0x17c/0x452 [btrfs]
[<ffffffffa01aa50b>] ? worker_loop+0x0/0x452 [btrfs]
[<ffffffff81040331>] ? kthread+0x79/0x81
[<ffffffff81003674>] ? kernel_thread_helper+0x4/0x10
[<ffffffff810402b8>] ? kthread+0x0/0x81
[<ffffffff81003670>] ? kernel_thread_helper+0x0/0x10
INFO: task btrfs-transacti:4230 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
btrfs-transac D 000000010042e1cc 0 4230 2 0x00000000
ffff8803e544d300 0000000000000046 0000000000004000 0000000000011680
ffff8803f3531fd8 ffff8803f3531fd8 ffff8803e544d300 0000000000011680
ffff8803fe488240 00000000000004c1 ffff8803ff8d7340 0000000381147502
Call Trace:
[<ffffffff810b4153>] ? sync_buffer+0x0/0x3f
[<ffffffff813089f3>] ? io_schedule+0x71/0xb1
[<ffffffff810b418e>] ? sync_buffer+0x3b/0x3f
[<ffffffff81308fba>] ? __wait_on_bit+0x41/0x70
[<ffffffff810b4153>] ? sync_buffer+0x0/0x3f
[<ffffffff81309054>] ? out_of_line_wait_on_bit+0x6b/0x77
[<ffffffff81040722>] ? wake_bit_function+0x0/0x23
[<ffffffffa0186635>] ? write_dev_supers+0xf3/0x225 [btrfs]
[<ffffffffa018693b>] ? write_all_supers+0x1d4/0x22c [btrfs]
[<ffffffffa01898a1>] ? btrfs_commit_transaction+0x4fe/0x5e1 [btrfs]
[<ffffffff810406f4>] ? autoremove_wake_function+0x0/0x2e
[<ffffffffa0185628>] ? transaction_kthread+0x16b/0x1fd [btrfs]
[<ffffffffa01854bd>] ? transaction_kthread+0x0/0x1fd [btrfs]
[<ffffffff81040331>] ? kthread+0x79/0x81
[<ffffffff81003674>] ? kernel_thread_helper+0x4/0x10
[<ffffffff810402b8>] ? kthread+0x0/0x81
[<ffffffff81003670>] ? kernel_thread_helper+0x0/0x10
INFO: task tar:31615 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
tar D 000000010042dee1 0 31615 4269 0x00000000
ffff8803ffa74d70 0000000000000082 0000000000004000 0000000000011680
ffff88010046dfd8 ffff88010046dfd8 ffff8803ffa74d70 0000000000011680
ffff880361cdd480 0000000161cdd480 ffff8803ff8becf0 0000000200005fff
Call Trace:
[<ffffffff8106d2af>] ? sync_page+0x0/0x45
[<ffffffff813089f3>] ? io_schedule+0x71/0xb1
[<ffffffff8106d2f0>] ? sync_page+0x41/0x45
[<ffffffff81308fba>] ? __wait_on_bit+0x41/0x70
[<ffffffff8106d483>] ? wait_on_page_bit+0x6b/0x71
[<ffffffff81040722>] ? wake_bit_function+0x0/0x23
[<ffffffffa0192917>] ? prepare_pages+0xe0/0x244 [btrfs]
[<ffffffffa017e85a>] ? btrfs_check_data_free_space+0x69/0x206 [btrfs]
[<ffffffffa0192f6a>] ? btrfs_file_write+0x405/0x711 [btrfs]
[<ffffffff811ab83d>] ? tty_write+0x213/0x22e
[<ffffffff810951b8>] ? vfs_write+0xad/0x149
[<ffffffff81095310>] ? sys_write+0x45/0x6e
[<ffffffff810028eb>] ? system_call_fastpath+0x16/0x1b
INFO: task btrfs-submit-0:4220 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
btrfs-submit- D 000000010042e12f 0 4220 2 0x00000000
ffff8803e584ac70 0000000000000046 0000000000004000 0000000000011680
ffff8803f7349fd8 ffff8803f7349fd8 ffff8803e584ac70 0000000000011680
0000000000000001 ffff8803ff99d250 ffffffff8149f020 0000000081150ab0
Call Trace:
[<ffffffff813089f3>] ? io_schedule+0x71/0xb1
[<ffffffff811470be>] ? get_request_wait+0xab/0x140
[<ffffffff810406f4>] ? autoremove_wake_function+0x0/0x2e
[<ffffffff81143a4d>] ? elv_rq_merge_ok+0x89/0x97
[<ffffffff8114a245>] ? blk_recount_segments+0x17/0x27
[<ffffffff81147429>] ? __make_request+0x2d6/0x3fc
[<ffffffff81145b16>] ? generic_make_request+0x207/0x268
[<ffffffff81145c12>] ? submit_bio+0x9b/0xa2
[<ffffffffa01aa081>] ? btrfs_requeue_work+0xd7/0xe1 [btrfs]
[<ffffffffa01a5365>] ? run_scheduled_bios+0x297/0x48f [btrfs]
[<ffffffffa01aa687>] ? worker_loop+0x17c/0x452 [btrfs]
[<ffffffffa01aa50b>] ? worker_loop+0x0/0x452 [btrfs]
[<ffffffff81040331>] ? kthread+0x79/0x81
[<ffffffff81003674>] ? kernel_thread_helper+0x4/0x10
[<ffffffff810402b8>] ? kthread+0x0/0x81
[<ffffffff81003670>] ? kernel_thread_helper+0x0/0x10
INFO: task btrfs-transacti:4230 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
btrfs-transac D 000000010042e1cc 0 4230 2 0x00000000
ffff8803e544d300 0000000000000046 0000000000004000 0000000000011680
ffff8803f3531fd8 ffff8803f3531fd8 ffff8803e544d300 0000000000011680
ffff8803fe488240 00000000000004c1 ffff8803ff8d7340 0000000381147502
Call Trace:
[<ffffffff810b4153>] ? sync_buffer+0x0/0x3f
[<ffffffff813089f3>] ? io_schedule+0x71/0xb1
[<ffffffff810b418e>] ? sync_buffer+0x3b/0x3f
[<ffffffff81308fba>] ? __wait_on_bit+0x41/0x70
[<ffffffff810b4153>] ? sync_buffer+0x0/0x3f
[<ffffffff81309054>] ? out_of_line_wait_on_bit+0x6b/0x77
[<ffffffff81040722>] ? wake_bit_function+0x0/0x23
[<ffffffffa0186635>] ? write_dev_supers+0xf3/0x225 [btrfs]
[<ffffffffa018693b>] ? write_all_supers+0x1d4/0x22c [btrfs]
[<ffffffffa01898a1>] ? btrfs_commit_transaction+0x4fe/0x5e1 [btrfs]
[<ffffffff810406f4>] ? autoremove_wake_function+0x0/0x2e
[<ffffffffa0185628>] ? transaction_kthread+0x16b/0x1fd [btrfs]
[<ffffffffa01854bd>] ? transaction_kthread+0x0/0x1fd [btrfs]
[<ffffffff81040331>] ? kthread+0x79/0x81
[<ffffffff81003674>] ? kernel_thread_helper+0x4/0x10
[<ffffffff810402b8>] ? kthread+0x0/0x81
[<ffffffff81003670>] ? kernel_thread_helper+0x0/0x10
INFO: task tar:31615 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
tar D 000000010042dee1 0 31615 4269 0x00000000
ffff8803ffa74d70 0000000000000082 0000000000004000 0000000000011680
ffff88010046dfd8 ffff88010046dfd8 ffff8803ffa74d70 0000000000011680
ffff880361cdd480 0000000161cdd480 ffff8803ff8becf0 0000000200005fff
Call Trace:
[<ffffffff8106d2af>] ? sync_page+0x0/0x45
[<ffffffff813089f3>] ? io_schedule+0x71/0xb1
[<ffffffff8106d2f0>] ? sync_page+0x41/0x45
[<ffffffff81308fba>] ? __wait_on_bit+0x41/0x70
[<ffffffff8106d483>] ? wait_on_page_bit+0x6b/0x71
[<ffffffff81040722>] ? wake_bit_function+0x0/0x23
[<ffffffffa0192917>] ? prepare_pages+0xe0/0x244 [btrfs]
[<ffffffffa017e85a>] ? btrfs_check_data_free_space+0x69/0x206 [btrfs]
[<ffffffffa0192f6a>] ? btrfs_file_write+0x405/0x711 [btrfs]
[<ffffffff811ab83d>] ? tty_write+0x213/0x22e
[<ffffffff810951b8>] ? vfs_write+0xad/0x149
[<ffffffff81095310>] ? sys_write+0x45/0x6e
[<ffffffff810028eb>] ? system_call_fastpath+0x16/0x1b
INFO: task btrfs-submit-0:4220 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
btrfs-submit- D 000000010042e12f 0 4220 2 0x00000000
ffff8803e584ac70 0000000000000046 0000000000004000 0000000000011680
ffff8803f7349fd8 ffff8803f7349fd8 ffff8803e584ac70 0000000000011680
0000000000000001 ffff8803ff99d250 ffffffff8149f020 0000000081150ab0
Call Trace:
[<ffffffff813089f3>] ? io_schedule+0x71/0xb1
[<ffffffff811470be>] ? get_request_wait+0xab/0x140
[<ffffffff810406f4>] ? autoremove_wake_function+0x0/0x2e
[<ffffffff81143a4d>] ? elv_rq_merge_ok+0x89/0x97
[<ffffffff8114a245>] ? blk_recount_segments+0x17/0x27
[<ffffffff81147429>] ? __make_request+0x2d6/0x3fc
[<ffffffff81145b16>] ? generic_make_request+0x207/0x268
[<ffffffff81145c12>] ? submit_bio+0x9b/0xa2
[<ffffffffa01aa081>] ? btrfs_requeue_work+0xd7/0xe1 [btrfs]
[<ffffffffa01a5365>] ? run_scheduled_bios+0x297/0x48f [btrfs]
[<ffffffffa01aa687>] ? worker_loop+0x17c/0x452 [btrfs]
[<ffffffffa01aa50b>] ? worker_loop+0x0/0x452 [btrfs]
[<ffffffff81040331>] ? kthread+0x79/0x81
[<ffffffff81003674>] ? kernel_thread_helper+0x4/0x10
[<ffffffff810402b8>] ? kthread+0x0/0x81
[<ffffffff81003670>] ? kernel_thread_helper+0x0/0x10
Jerome J. Ibanes
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