On Wed, May 14, 2014 at 08:28:30AM -0400, Chris Mason wrote: > I think Filipe fixed this one: > > https://patchwork.kernel.org/patch/4143821/
I applied this patch, and I don't have the same deadlock anymore, but legolas:/mnt/btrfs_pool1# btrfs-subvolume-backup --init -k 5 var /mnt/btrfs_pool2/ Create a readonly snapshot of 'var' in './var_ro.20140514_06:39:50' At subvol var_ro.20140514_06:39:50 At subvol var_ro.20140514_06:39:50 has been hung for 8H and only copied 200MB. I have 2 CPUs stuck at 100% and dmesg shows: INFO: task btrfs-cleaner:3479 blocked for more than 120 seconds. Not tainted 3.15.0-rc5-amd64-i915-preempt-20140216s1 #2 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. btrfs-cleaner D 0000000000000000 0 3479 2 0x00000000 ffff8800ca2d9d00 0000000000000046 ffff880401f5b270 ffff8800ca2d9fd8 ffff8800ca1a6110 00000000000141c0 ffff8800c32d2700 ffff8800ca2c11e8 0000000000000000 ffff8800ca2c1000 ffff8803cc4dcf20 ffff8800ca2d9d10 Call Trace: [<ffffffff8161c876>] schedule+0x73/0x75 [<ffffffff8122a4cb>] wait_current_trans.isra.15+0x98/0xf4 [<ffffffff8108473d>] ? finish_wait+0x65/0x65 [<ffffffff8122b9e5>] start_transaction+0x498/0x4fc [<ffffffff8122bdcf>] ? __btrfs_end_transaction+0x2a8/0x2cd [<ffffffff8122ba64>] btrfs_start_transaction+0x1b/0x1d [<ffffffff8121c550>] btrfs_drop_snapshot+0x443/0x610 [<ffffffff8161ef9b>] ? _raw_spin_unlock+0x17/0x2a [<ffffffff810764de>] ? get_parent_ip+0xd/0x3c [<ffffffff8122c20d>] btrfs_clean_one_deleted_snapshot+0x103/0x10f [<ffffffff812248e5>] cleaner_kthread+0x103/0x136 [<ffffffff812247e2>] ? btrfs_alloc_root+0x26/0x26 [<ffffffff8106b467>] kthread+0xae/0xb6 [<ffffffff8106b3b9>] ? __kthread_parkme+0x61/0x61 [<ffffffff81625afc>] ret_from_fork+0x7c/0xb0 [<ffffffff8106b3b9>] ? __kthread_parkme+0x61/0x61 INFO: task btrfs-transacti:3480 blocked for more than 120 seconds. Not tainted 3.15.0-rc5-amd64-i915-preempt-20140216s1 #2 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. btrfs-transacti D 0000000000000000 0 3480 2 0x00000000 ffff8800ccac1b00 0000000000000046 ffff8804067bd2b8 ffff8800ccac1fd8 ffff8800ca1925d0 00000000000141c0 ffff880401bb6100 ffff8803e9700c40 ffff880401bb6140 ffff880401f5b000 ffff8804067bd280 ffff8800ccac1b10 Call Trace: [<ffffffff8161c876>] schedule+0x73/0x75 [<ffffffff81215b97>] cache_block_group+0x12d/0x343 [<ffffffff8108473d>] ? finish_wait+0x65/0x65 [<ffffffff8121a966>] find_free_extent+0x391/0x89e [<ffffffff8121afce>] btrfs_reserve_extent+0x70/0x114 [<ffffffff81231f04>] __btrfs_prealloc_file_range+0xcc/0x2d8 [<ffffffff8120c445>] ? btrfs_free_path+0x26/0x29 [<ffffffff81237f0b>] btrfs_prealloc_file_range_trans+0x30/0x32 [<ffffffff8121db72>] btrfs_write_dirty_block_groups+0x24b/0x556 [<ffffffff81617c91>] commit_cowonly_roots+0x14d/0x219 [<ffffffff8122b0eb>] btrfs_commit_transaction+0x44e/0x8b0 [<ffffffff8108473d>] ? finish_wait+0x65/0x65 [<ffffffff81227791>] transaction_kthread+0xf8/0x1ab [<ffffffff81227699>] ? btrfs_cleanup_transaction+0x44c/0x44c [<ffffffff8106b467>] kthread+0xae/0xb6 [<ffffffff8106b3b9>] ? __kthread_parkme+0x61/0x61 [<ffffffff81625afc>] ret_from_fork+0x7c/0xb0 [<ffffffff8106b3b9>] ? __kthread_parkme+0x61/0x61 INFO: task kworker/u16:13:12552 blocked for more than 120 seconds. Not tainted 3.15.0-rc5-amd64-i915-preempt-20140216s1 #2 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u16:13 D 0000000000000000 0 12552 2 0x00000080 Workqueue: writeback bdi_writeback_workfn (flush-btrfs-2) ffff8803bd841a00 0000000000000046 ffff8803bd8419d0 ffff8803bd841fd8 ffff8803bd90a190 00000000000141c0 ffff88041e2941c0 ffff8803bd90a190 ffff8803bd841aa0 0000000000000002 ffffffff810fda1a ffff8803bd841a10 Call Trace: [<ffffffff810fda1a>] ? wait_on_page_read+0x3c/0x3c [<ffffffff8161c876>] schedule+0x73/0x75 [<ffffffff8161ca1b>] io_schedule+0x60/0x7a [<ffffffff810fda28>] sleep_on_page+0xe/0x12 [<ffffffff8161cdab>] __wait_on_bit_lock+0x46/0x8a [<ffffffff810fdae3>] __lock_page+0x69/0x6b [<ffffffff81084771>] ? autoremove_wake_function+0x34/0x34 [<ffffffff81240c41>] lock_page+0x1e/0x21 [<ffffffff81244779>] extent_write_cache_pages.isra.16.constprop.32+0x10e/0x2c3 [<ffffffff81244bd4>] extent_writepages+0x4b/0x5c [<ffffffff8122ee1f>] ? btrfs_submit_direct+0x3f4/0x3f4 [<ffffffff8162280c>] ? preempt_count_add+0x77/0x8d [<ffffffff8122d3fa>] btrfs_writepages+0x28/0x2a [<ffffffff811082b1>] do_writepages+0x1e/0x2c [<ffffffff81175ef2>] __writeback_single_inode+0x7d/0x238 [<ffffffff81176c2a>] writeback_sb_inodes+0x1eb/0x339 [<ffffffff81176dec>] __writeback_inodes_wb+0x74/0xb7 [<ffffffff81176f67>] wb_writeback+0x138/0x293 [<ffffffff81107584>] ? bdi_dirty_limit+0x31/0x91 [<ffffffff811775dd>] bdi_writeback_workfn+0x1d8/0x329 [<ffffffff8100d047>] ? load_TLS+0xb/0xf [<ffffffff81065d2e>] process_one_work+0x195/0x2d2 [<ffffffff8106624a>] worker_thread+0x136/0x205 [<ffffffff81066114>] ? rescuer_thread+0x27a/0x27a [<ffffffff8106b467>] kthread+0xae/0xb6 [<ffffffff8106b3b9>] ? __kthread_parkme+0x61/0x61 [<ffffffff81625afc>] ret_from_fork+0x7c/0xb0 [<ffffffff8106b3b9>] ? __kthread_parkme+0x61/0x61 INFO: task kworker/u16:1:13077 blocked for more than 120 seconds. Not tainted 3.15.0-rc5-amd64-i915-preempt-20140216s1 #2 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u16:1 D 0000000000000000 0 13077 2 0x00000080 Workqueue: btrfs-delalloc normal_work_helper ffff8803b50fd860 0000000000000046 ffff8803b50fd830 ffff8803b50fdfd8 ffff8803b77282d0 00000000000141c0 ffff88041e2d41c0 ffff8803b77282d0 ffff8803b50fd900 0000000000000002 ffffffff810fda1a ffff8803b50fd870 Call Trace: [<ffffffff810fda1a>] ? wait_on_page_read+0x3c/0x3c [<ffffffff8161c876>] schedule+0x73/0x75 [<ffffffff8161ca1b>] io_schedule+0x60/0x7a [<ffffffff810fda28>] sleep_on_page+0xe/0x12 [<ffffffff8161cdab>] __wait_on_bit_lock+0x46/0x8a [<ffffffff810fdae3>] __lock_page+0x69/0x6b [<ffffffff81084771>] ? autoremove_wake_function+0x34/0x34 [<ffffffff810fe3c9>] lock_page+0x19/0x1c [<ffffffff810fe425>] find_lock_entry+0x33/0x55 [<ffffffff810fe455>] find_lock_page+0xe/0x1b [<ffffffff810fe93e>] find_or_create_page+0x31/0x83 [<ffffffff8125ee32>] io_ctl_prepare_pages+0x49/0x11c [<ffffffff812609e2>] __load_free_space_cache+0x1be/0x56c [<ffffffff81260e76>] load_free_space_cache+0xe6/0x199 [<ffffffff810764de>] ? get_parent_ip+0xd/0x3c [<ffffffff81215c2e>] cache_block_group+0x1c4/0x343 [<ffffffff812611c2>] ? btrfs_find_space_for_alloc+0x1f8/0x21d [<ffffffff8108473d>] ? finish_wait+0x65/0x65 [<ffffffff8121a966>] find_free_extent+0x391/0x89e [<ffffffff8121afce>] btrfs_reserve_extent+0x70/0x114 [<ffffffff8123087c>] cow_file_range+0x1b0/0x388 [<ffffffff8123152b>] submit_compressed_extents+0x102/0x40f [<ffffffff8122fa27>] ? async_cow_free+0x24/0x27 [<ffffffff812318be>] async_cow_submit+0x86/0x8b [<ffffffff81250629>] normal_work_helper+0x194/0x240 [<ffffffff81065d2e>] process_one_work+0x195/0x2d2 [<ffffffff8106624a>] worker_thread+0x136/0x205 [<ffffffff81066114>] ? rescuer_thread+0x27a/0x27a [<ffffffff8106b467>] kthread+0xae/0xb6 [<ffffffff8106b3b9>] ? __kthread_parkme+0x61/0x61 [<ffffffff81625afc>] ret_from_fork+0x7c/0xb0 [<ffffffff8106b3b9>] ? __kthread_parkme+0x61/0x61 INFO: task btrfs:13329 blocked for more than 120 seconds. Not tainted 3.15.0-rc5-amd64-i915-preempt-20140216s1 #2 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. btrfs D 0000000000000004 0 13329 13305 0x00000080 ffff8803aaf75b10 0000000000000082 ffff8803aaf75ae0 ffff8803aaf75fd8 ffff8803aa8165d0 00000000000141c0 ffff88041e3141c0 ffff8803aa8165d0 ffff8803aaf75bb0 0000000000000002 ffffffff810fda1a ffff8803aaf75b20 Call Trace: [<ffffffff810fda1a>] ? wait_on_page_read+0x3c/0x3c [<ffffffff8161c876>] schedule+0x73/0x75 [<ffffffff8161ca1b>] io_schedule+0x60/0x7a [<ffffffff810fda28>] sleep_on_page+0xe/0x12 [<ffffffff8161cdab>] __wait_on_bit_lock+0x46/0x8a [<ffffffff810fdae3>] __lock_page+0x69/0x6b [<ffffffff81084771>] ? autoremove_wake_function+0x34/0x34 [<ffffffff81240c41>] lock_page+0x1e/0x21 [<ffffffff81244779>] extent_write_cache_pages.isra.16.constprop.32+0x10e/0x2c3 [<ffffffff8110a5b2>] ? pagevec_lookup_entries+0x1e/0x26 [<ffffffff8110ae23>] ? truncate_inode_pages_range+0x2a9/0x3ad [<ffffffff81211106>] ? setup_items_for_insert+0x2ba/0x2da [<ffffffff81244bd4>] extent_writepages+0x4b/0x5c [<ffffffff8122ee1f>] ? btrfs_submit_direct+0x3f4/0x3f4 [<ffffffff8122d3fa>] btrfs_writepages+0x28/0x2a [<ffffffff811082b1>] do_writepages+0x1e/0x2c [<ffffffff810ff179>] __filemap_fdatawrite_range+0x55/0x57 [<ffffffff810ff1ef>] filemap_fdatawrite_range+0x13/0x15 [<ffffffff8123fcda>] btrfs_wait_ordered_range+0x85/0x11a [<ffffffff8123321e>] btrfs_truncate+0x45/0x22b [<ffffffff81233cb1>] btrfs_setattr+0x19b/0x273 [<ffffffff8116b148>] notify_change+0x1be/0x2a6 [<ffffffff81153d74>] do_truncate+0x69/0x90 [<ffffffff81153e8c>] vfs_truncate+0xf1/0x11f [<ffffffff81153f04>] do_sys_truncate+0x4a/0x86 [<ffffffff81154041>] SyS_truncate+0xe/0x10 [<ffffffff81625bad>] system_call_fastpath+0x1a/0x1f INFO: task btrfs-cleaner:3479 blocked for more than 120 seconds. Not tainted 3.15.0-rc5-amd64-i915-preempt-20140216s1 #2 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. btrfs-cleaner D 0000000000000000 0 3479 2 0x00000000 ffff8800ca2d9d00 0000000000000046 ffff880401f5b270 ffff8800ca2d9fd8 ffff8800ca1a6110 00000000000141c0 ffff8800c32d2700 ffff8800ca2c11e8 0000000000000000 ffff8800ca2c1000 ffff8803cc4dcf20 ffff8800ca2d9d10 Call Trace: [<ffffffff8161c876>] schedule+0x73/0x75 [<ffffffff8122a4cb>] wait_current_trans.isra.15+0x98/0xf4 [<ffffffff8108473d>] ? finish_wait+0x65/0x65 [<ffffffff8122b9e5>] start_transaction+0x498/0x4fc [<ffffffff8122bdcf>] ? __btrfs_end_transaction+0x2a8/0x2cd [<ffffffff8122ba64>] btrfs_start_transaction+0x1b/0x1d [<ffffffff8121c550>] btrfs_drop_snapshot+0x443/0x610 [<ffffffff8161ef9b>] ? _raw_spin_unlock+0x17/0x2a [<ffffffff810764de>] ? get_parent_ip+0xd/0x3c [<ffffffff8122c20d>] btrfs_clean_one_deleted_snapshot+0x103/0x10f [<ffffffff812248e5>] cleaner_kthread+0x103/0x136 [<ffffffff812247e2>] ? btrfs_alloc_root+0x26/0x26 [<ffffffff8106b467>] kthread+0xae/0xb6 [<ffffffff8106b3b9>] ? __kthread_parkme+0x61/0x61 [<ffffffff81625afc>] ret_from_fork+0x7c/0xb0 [<ffffffff8106b3b9>] ? __kthread_parkme+0x61/0x61 INFO: task btrfs-transacti:3480 blocked for more than 120 seconds. Not tainted 3.15.0-rc5-amd64-i915-preempt-20140216s1 #2 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. btrfs-transacti D 0000000000000000 0 3480 2 0x00000000 ffff8800ccac1b00 0000000000000046 ffff8804067bd2b8 ffff8800ccac1fd8 ffff8800ca1925d0 00000000000141c0 ffff880401bb6100 ffff8803e9700c40 ffff880401bb6140 ffff880401f5b000 ffff8804067bd280 ffff8800ccac1b10 Call Trace: [<ffffffff8161c876>] schedule+0x73/0x75 [<ffffffff81215b97>] cache_block_group+0x12d/0x343 [<ffffffff8108473d>] ? finish_wait+0x65/0x65 [<ffffffff8121a966>] find_free_extent+0x391/0x89e [<ffffffff8121afce>] btrfs_reserve_extent+0x70/0x114 [<ffffffff81231f04>] __btrfs_prealloc_file_range+0xcc/0x2d8 [<ffffffff8120c445>] ? btrfs_free_path+0x26/0x29 [<ffffffff81237f0b>] btrfs_prealloc_file_range_trans+0x30/0x32 [<ffffffff8121db72>] btrfs_write_dirty_block_groups+0x24b/0x556 [<ffffffff81617c91>] commit_cowonly_roots+0x14d/0x219 [<ffffffff8122b0eb>] btrfs_commit_transaction+0x44e/0x8b0 [<ffffffff8108473d>] ? finish_wait+0x65/0x65 [<ffffffff81227791>] transaction_kthread+0xf8/0x1ab [<ffffffff81227699>] ? btrfs_cleanup_transaction+0x44c/0x44c [<ffffffff8106b467>] kthread+0xae/0xb6 [<ffffffff8106b3b9>] ? __kthread_parkme+0x61/0x61 [<ffffffff81625afc>] ret_from_fork+0x7c/0xb0 [<ffffffff8106b3b9>] ? __kthread_parkme+0x61/0x61 INFO: task kworker/u16:13:12552 blocked for more than 120 seconds. Not tainted 3.15.0-rc5-amd64-i915-preempt-20140216s1 #2 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u16:13 D 0000000000000000 0 12552 2 0x00000080 Workqueue: writeback bdi_writeback_workfn (flush-btrfs-2) ffff8803bd841a00 0000000000000046 ffff8803bd8419d0 ffff8803bd841fd8 ffff8803bd90a190 00000000000141c0 ffff88041e2941c0 ffff8803bd90a190 ffff8803bd841aa0 0000000000000002 ffffffff810fda1a ffff8803bd841a10 Call Trace: [<ffffffff810fda1a>] ? wait_on_page_read+0x3c/0x3c [<ffffffff8161c876>] schedule+0x73/0x75 [<ffffffff8161ca1b>] io_schedule+0x60/0x7a [<ffffffff810fda28>] sleep_on_page+0xe/0x12 [<ffffffff8161cdab>] __wait_on_bit_lock+0x46/0x8a [<ffffffff810fdae3>] __lock_page+0x69/0x6b [<ffffffff81084771>] ? autoremove_wake_function+0x34/0x34 [<ffffffff81240c41>] lock_page+0x1e/0x21 [<ffffffff81244779>] extent_write_cache_pages.isra.16.constprop.32+0x10e/0x2c3 [<ffffffff81244bd4>] extent_writepages+0x4b/0x5c [<ffffffff8122ee1f>] ? btrfs_submit_direct+0x3f4/0x3f4 [<ffffffff8162280c>] ? preempt_count_add+0x77/0x8d [<ffffffff8122d3fa>] btrfs_writepages+0x28/0x2a [<ffffffff811082b1>] do_writepages+0x1e/0x2c [<ffffffff81175ef2>] __writeback_single_inode+0x7d/0x238 [<ffffffff81176c2a>] writeback_sb_inodes+0x1eb/0x339 [<ffffffff81176dec>] __writeback_inodes_wb+0x74/0xb7 [<ffffffff81176f67>] wb_writeback+0x138/0x293 [<ffffffff81107584>] ? bdi_dirty_limit+0x31/0x91 [<ffffffff811775dd>] bdi_writeback_workfn+0x1d8/0x329 [<ffffffff8100d047>] ? load_TLS+0xb/0xf [<ffffffff81065d2e>] process_one_work+0x195/0x2d2 [<ffffffff8106624a>] worker_thread+0x136/0x205 [<ffffffff81066114>] ? rescuer_thread+0x27a/0x27a [<ffffffff8106b467>] kthread+0xae/0xb6 [<ffffffff8106b3b9>] ? __kthread_parkme+0x61/0x61 [<ffffffff81625afc>] ret_from_fork+0x7c/0xb0 [<ffffffff8106b3b9>] ? __kthread_parkme+0x61/0x61 INFO: task kworker/u16:1:13077 blocked for more than 120 seconds. Not tainted 3.15.0-rc5-amd64-i915-preempt-20140216s1 #2 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u16:1 D 0000000000000000 0 13077 2 0x00000080 Workqueue: btrfs-delalloc normal_work_helper ffff8803b50fd860 0000000000000046 ffff8803b50fd830 ffff8803b50fdfd8 ffff8803b77282d0 00000000000141c0 ffff88041e2d41c0 ffff8803b77282d0 ffff8803b50fd900 0000000000000002 ffffffff810fda1a ffff8803b50fd870 Call Trace: [<ffffffff810fda1a>] ? wait_on_page_read+0x3c/0x3c [<ffffffff8161c876>] schedule+0x73/0x75 [<ffffffff8161ca1b>] io_schedule+0x60/0x7a [<ffffffff810fda28>] sleep_on_page+0xe/0x12 [<ffffffff8161cdab>] __wait_on_bit_lock+0x46/0x8a [<ffffffff810fdae3>] __lock_page+0x69/0x6b [<ffffffff81084771>] ? autoremove_wake_function+0x34/0x34 [<ffffffff810fe3c9>] lock_page+0x19/0x1c [<ffffffff810fe425>] find_lock_entry+0x33/0x55 [<ffffffff810fe455>] find_lock_page+0xe/0x1b [<ffffffff810fe93e>] find_or_create_page+0x31/0x83 [<ffffffff8125ee32>] io_ctl_prepare_pages+0x49/0x11c [<ffffffff812609e2>] __load_free_space_cache+0x1be/0x56c [<ffffffff81260e76>] load_free_space_cache+0xe6/0x199 [<ffffffff810764de>] ? get_parent_ip+0xd/0x3c [<ffffffff81215c2e>] cache_block_group+0x1c4/0x343 [<ffffffff812611c2>] ? btrfs_find_space_for_alloc+0x1f8/0x21d [<ffffffff8108473d>] ? finish_wait+0x65/0x65 [<ffffffff8121a966>] find_free_extent+0x391/0x89e [<ffffffff8121afce>] btrfs_reserve_extent+0x70/0x114 [<ffffffff8123087c>] cow_file_range+0x1b0/0x388 [<ffffffff8123152b>] submit_compressed_extents+0x102/0x40f [<ffffffff8122fa27>] ? async_cow_free+0x24/0x27 [<ffffffff812318be>] async_cow_submit+0x86/0x8b [<ffffffff81250629>] normal_work_helper+0x194/0x240 [<ffffffff81065d2e>] process_one_work+0x195/0x2d2 [<ffffffff8106624a>] worker_thread+0x136/0x205 [<ffffffff81066114>] ? rescuer_thread+0x27a/0x27a [<ffffffff8106b467>] kthread+0xae/0xb6 [<ffffffff8106b3b9>] ? __kthread_parkme+0x61/0x61 [<ffffffff81625afc>] ret_from_fork+0x7c/0xb0 [<ffffffff8106b3b9>] ? __kthread_parkme+0x61/0x61 INFO: task btrfs:13329 blocked for more than 120 seconds. Not tainted 3.15.0-rc5-amd64-i915-preempt-20140216s1 #2 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. btrfs D 0000000000000004 0 13329 13305 0x00000080 ffff8803aaf75b10 0000000000000082 ffff8803aaf75ae0 ffff8803aaf75fd8 ffff8803aa8165d0 00000000000141c0 ffff88041e3141c0 ffff8803aa8165d0 ffff8803aaf75bb0 0000000000000002 ffffffff810fda1a ffff8803aaf75b20 Call Trace: [<ffffffff810fda1a>] ? wait_on_page_read+0x3c/0x3c [<ffffffff8161c876>] schedule+0x73/0x75 [<ffffffff8161ca1b>] io_schedule+0x60/0x7a [<ffffffff810fda28>] sleep_on_page+0xe/0x12 [<ffffffff8161cdab>] __wait_on_bit_lock+0x46/0x8a [<ffffffff810fdae3>] __lock_page+0x69/0x6b [<ffffffff81084771>] ? autoremove_wake_function+0x34/0x34 [<ffffffff81240c41>] lock_page+0x1e/0x21 [<ffffffff81244779>] extent_write_cache_pages.isra.16.constprop.32+0x10e/0x2c3 [<ffffffff8110a5b2>] ? pagevec_lookup_entries+0x1e/0x26 [<ffffffff8110ae23>] ? truncate_inode_pages_range+0x2a9/0x3ad [<ffffffff81211106>] ? setup_items_for_insert+0x2ba/0x2da [<ffffffff81244bd4>] extent_writepages+0x4b/0x5c [<ffffffff8122ee1f>] ? btrfs_submit_direct+0x3f4/0x3f4 [<ffffffff8122d3fa>] btrfs_writepages+0x28/0x2a [<ffffffff811082b1>] do_writepages+0x1e/0x2c [<ffffffff810ff179>] __filemap_fdatawrite_range+0x55/0x57 [<ffffffff810ff1ef>] filemap_fdatawrite_range+0x13/0x15 [<ffffffff8123fcda>] btrfs_wait_ordered_range+0x85/0x11a [<ffffffff8123321e>] btrfs_truncate+0x45/0x22b [<ffffffff81233cb1>] btrfs_setattr+0x19b/0x273 [<ffffffff8116b148>] notify_change+0x1be/0x2a6 [<ffffffff81153d74>] do_truncate+0x69/0x90 [<ffffffff81153e8c>] vfs_truncate+0xf1/0x11f [<ffffffff81153f04>] do_sys_truncate+0x4a/0x86 [<ffffffff81154041>] SyS_truncate+0xe/0x10 [<ffffffff81625bad>] system_call_fastpath+0x1a/0x1f Nothing after that. btrfs receive /mnt/btrfs_pool2 seems uninterruptible and suck on sleep_on_page: legolas:/mnt/btrfs_pool1# ps -eo pid,user,args,wchan | grep btrfs 526 root [btrfs-worker] rescuer_thread 527 root [btrfs-worker-hi] rescuer_thread 528 root [btrfs-delalloc] rescuer_thread 529 root [btrfs-flush_del] rescuer_thread 530 root [btrfs-cache] rescuer_thread 531 root [btrfs-submit] rescuer_thread 532 root [btrfs-fixup] rescuer_thread 533 root [btrfs-endio] rescuer_thread 534 root [btrfs-endio-met] rescuer_thread 535 root [btrfs-endio-met] rescuer_thread 536 root [btrfs-endio-rai] rescuer_thread 537 root [btrfs-rmw] rescuer_thread 538 root [btrfs-endio-wri] rescuer_thread 539 root [btrfs-freespace] rescuer_thread 540 root [btrfs-delayed-m] rescuer_thread 541 root [btrfs-readahead] rescuer_thread 542 root [btrfs-qgroup-re] rescuer_thread 543 root [btrfs-cleaner] cleaner_kthread 544 root [btrfs-transacti] transaction_kthread 2424 root [btrfs-worker] rescuer_thread 2425 root [btrfs-worker-hi] rescuer_thread 2426 root [btrfs-delalloc] rescuer_thread 2427 root [btrfs-flush_del] rescuer_thread 2428 root [btrfs-cache] rescuer_thread 2429 root [btrfs-submit] rescuer_thread 2430 root [btrfs-fixup] rescuer_thread 2431 root [btrfs-endio] rescuer_thread 2432 root [btrfs-endio-met] rescuer_thread 2433 root [btrfs-endio-met] rescuer_thread 2434 root [btrfs-endio-rai] rescuer_thread 2435 root [btrfs-rmw] rescuer_thread 2436 root [btrfs-endio-wri] rescuer_thread 2437 root [btrfs-freespace] rescuer_thread 2438 root [btrfs-delayed-m] rescuer_thread 2439 root [btrfs-readahead] rescuer_thread 2440 root [btrfs-qgroup-re] rescuer_thread 3479 root [btrfs-cleaner] wait_current_trans.isra.15 3480 root [btrfs-transacti] cache_block_group 13329 root btrfs receive /mnt/btrfs_po sleep_on_page I now still have 2 CPUs stuck, looks like I'll need to reboot. Marc -- "A mouse is a device used to point at the xterm you want to type in" - A.S.R. Microsoft is to operating systems .... .... what McDonalds is to gourmet cooking Home page: http://marc.merlins.org/ | PGP 1024R/763BE901 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html