Hi, while using debian testing kernel 3.14.13-2 with backported patches up to d46cc754c0f0ac8cf9016d256dccd1a8e78ffbec ( bcache: add kthread_wait_freezable() ) I see this output in dmesg/netconsole. System is running Xen, using two md raid10 with separate SSD cache each in writethrough mode. Aug 18 01:30:00 [ 2730.772893] INFO: task kworker/2:1:585 blocked for more than 120 seconds. Aug 18 01:30:00 [ 2730.773019] Not tainted 3.14-2-amd64 #1 Aug 18 01:30:00 [ 2730.773097] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Aug 18 01:30:00 [ 2730.773196] kworker/2:1 D Aug 18 01:30:00 [ 2730.773420] Workqueue: bcache bch_data_insert_keys [bcache] Aug 18 01:30:00 [ 2730.774510] Call Trace: Aug 18 01:30:00 [ 2730.774596] [<ffffffff814ca39d>] ? rwsem_down_read_failed+0xed/0x130 Aug 18 01:30:00 [ 2730.774683] [<ffffffff8128bf04>] ? call_rwsem_down_read_failed+0x14/0x30 Aug 18 01:30:00 [ 2730.774776] [<ffffffffa0209bb0>] ? bch_btree_insert_check_key+0x150/0x150 [bcache] Aug 18 01:30:00 [ 2730.774878] [<ffffffff814c9c37>] ? down_read+0x17/0x20 Aug 18 01:30:00 [ 2730.774985] [<ffffffffa020a335>] ? __bch_btree_map_nodes+0xc5/0x140 [bcache] Aug 18 01:30:00 [ 2730.775077] [<ffffffffa0209bb0>] ? bch_btree_insert_check_key+0x150/0x150 [bcache] Aug 18 01:30:00 [ 2730.775184] [<ffffffffa020a488>] ? bch_btree_insert+0xd8/0x140 [bcache] Aug 18 01:30:00 [ 2730.775273] [<ffffffff8109f4e0>] ? prepare_to_wait_event+0xf0/0xf0 Aug 18 01:30:00 [ 2730.775363] [<ffffffffa02115df>] ? bch_data_insert_keys+0x2f/0x140 [bcache] Aug 18 01:30:00 [ 2730.775451] [<ffffffff81079bdd>] ? process_one_work+0x16d/0x420 Aug 18 01:30:00 [ 2730.775533] [<ffffffff8107a7e6>] ? worker_thread+0x116/0x3b0 Aug 18 01:30:00 [ 2730.775615] [<ffffffff8107a6d0>] ? rescuer_thread+0x380/0x380 Aug 18 01:30:00 [ 2730.775698] [<ffffffff81080a68>] ? kthread+0xb8/0xd0 Aug 18 01:30:00 [ 2730.775778] [<ffffffff810809b0>] ? kthread_create_on_node+0x170/0x170 Aug 18 01:30:00 [ 2730.775863] [<ffffffff814d2c4c>] ? ret_from_fork+0x7c/0xb0 Aug 18 01:30:00 [ 2730.775962] [<ffffffff810809b0>] ? kthread_create_on_node+0x170/0x170 Aug 18 01:30:00 [ 2730.776045] INFO: task kworker/6:1:592 blocked for more than 120 seconds. Aug 18 01:30:00 [ 2730.776126] Not tainted 3.14-2-amd64 #1 Aug 18 01:30:00 [ 2730.776200] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Aug 18 01:30:00 [ 2730.776297] kworker/6:1 D Aug 18 01:30:00 [ 2730.776490] Workqueue: bcache bch_data_insert_keys [bcache] Aug 18 01:30:00 [ 2730.777780] Call Trace: Aug 18 01:30:00 [ 2730.777881] [<ffffffff814ca39d>] ? rwsem_down_read_failed+0xed/0x130 Aug 18 01:30:00 [ 2730.777986] [<ffffffff8128bf04>] ? call_rwsem_down_read_failed+0x14/0x30 Aug 18 01:30:00 [ 2730.778109] [<ffffffffa0209bb0>] ? bch_btree_insert_check_key+0x150/0x150 [bcache] Aug 18 01:30:00 [ 2730.778230] [<ffffffff814c9c37>] ? down_read+0x17/0x20 Aug 18 01:30:00 [ 2730.778344] [<ffffffffa020a335>] ? __bch_btree_map_nodes+0xc5/0x140 [bcache] Aug 18 01:30:00 [ 2730.778451] [<ffffffffa0209bb0>] ? bch_btree_insert_check_key+0x150/0x150 [bcache] Aug 18 01:30:00 [ 2730.778559] [<ffffffffa020a488>] ? bch_btree_insert+0xd8/0x140 [bcache] Aug 18 01:30:00 [ 2730.778644] [<ffffffff8109f4e0>] ? prepare_to_wait_event+0xf0/0xf0 Aug 18 01:30:00 [ 2730.778733] [<ffffffffa02115df>] ? bch_data_insert_keys+0x2f/0x140 [bcache] Aug 18 01:30:00 [ 2730.778825] [<ffffffff81079bdd>] ? process_one_work+0x16d/0x420 Aug 18 01:30:00 [ 2730.778919] [<ffffffff8107a7e6>] ? worker_thread+0x116/0x3b0 Aug 18 01:30:00 [ 2730.779003] [<ffffffff8107a6d0>] ? rescuer_thread+0x380/0x380 Aug 18 01:30:00 [ 2730.779085] [<ffffffff81080a68>] ? kthread+0xb8/0xd0 Aug 18 01:30:00 [ 2730.779164] [<ffffffff810809b0>] ? kthread_create_on_node+0x170/0x170 Aug 18 01:30:00 [ 2730.779247] [<ffffffff814d2c4c>] ? ret_from_fork+0x7c/0xb0 Aug 18 01:30:00 [ 2730.779328] [<ffffffff810809b0>] ? kthread_create_on_node+0x170/0x170 Aug 18 01:30:00 [ 2730.779410] INFO: task kworker/8:1:596 blocked for more than 120 seconds. Aug 18 01:30:00 [ 2730.779490] Not tainted 3.14-2-amd64 #1 Aug 18 01:30:00 [ 2730.779565] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Aug 18 01:30:00 [ 2730.779667] kworker/8:1 D Aug 18 01:30:00 [ 2730.779888] Workqueue: bcache bch_data_insert_keys [bcache] Aug 18 01:30:00 [ 2730.780724] Call Trace: Aug 18 01:30:00 [ 2730.780785] [<ffffffff814ca39d>] ? rwsem_down_read_failed+0xed/0x130 Aug 18 01:30:00 [ 2730.780878] [<ffffffff8128bf04>] ? call_rwsem_down_read_failed+0x14/0x30 Aug 18 01:30:00 [ 2730.780949] [<ffffffffa0209bb0>] ? bch_btree_insert_check_key+0x150/0x150 [bcache] Aug 18 01:30:00 [ 2730.781030] [<ffffffff814c9c37>] ? down_read+0x17/0x20 Aug 18 01:30:00 [ 2730.781095] [<ffffffffa020a335>] ? __bch_btree_map_nodes+0xc5/0x140 [bcache] Aug 18 01:30:00 [ 2730.781164] [<ffffffffa0209bb0>] ? bch_btree_insert_check_key+0x150/0x150 [bcache] Aug 18 01:30:00 [ 2730.781247] [<ffffffffa020a488>] ? bch_btree_insert+0xd8/0x140 [bcache] Aug 18 01:30:00 [ 2730.781521] [<ffffffff8109f4e0>] ? prepare_to_wait_event+0xf0/0xf0 Aug 18 01:30:00 [ 2730.781612] [<ffffffffa02115df>] ? bch_data_insert_keys+0x2f/0x140 [bcache] Aug 18 01:30:00 [ 2730.781678] [<ffffffff81079bdd>] ? process_one_work+0x16d/0x420 Aug 18 01:30:00 [ 2730.781746] [<ffffffff8107a7e6>] ? worker_thread+0x116/0x3b0 Aug 18 01:30:00 [ 2730.781816] [<ffffffff8107a6d0>] ? rescuer_thread+0x380/0x380 Aug 18 01:30:00 [ 2730.781884] [<ffffffff81080a68>] ? kthread+0xb8/0xd0 Aug 18 01:30:00 [ 2730.781945] [<ffffffff810809b0>] ? kthread_create_on_node+0x170/0x170 Aug 18 01:30:00 [ 2730.782007] [<ffffffff814d2c4c>] ? ret_from_fork+0x7c/0xb0 Aug 18 01:30:00 [ 2730.782069] [<ffffffff810809b0>] ? kthread_create_on_node+0x170/0x170 Aug 18 01:30:00 [ 2730.782132] INFO: task kworker/10:1:600 blocked for more than 120 seconds. Aug 18 01:30:00 [ 2730.782195] Not tainted 3.14-2-amd64 #1 Aug 18 01:30:00 [ 2730.783454] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Aug 18 01:30:00 [ 2730.783553] kworker/10:1 D Aug 18 01:30:00 [ 2730.783761] Workqueue: bcache bch_data_insert_keys [bcache] Aug 18 01:30:00 [ 2730.784938] Call Trace: Aug 18 01:30:00 [ 2730.785025] [<ffffffff814ca39d>] ? rwsem_down_read_failed+0xed/0x130 Aug 18 01:30:00 [ 2730.785124] [<ffffffff8128bf04>] ? call_rwsem_down_read_failed+0x14/0x30 Aug 18 01:30:00 [ 2730.785224] [<ffffffffa0209bb0>] ? bch_btree_insert_check_key+0x150/0x150 [bcache] Aug 18 01:30:00 [ 2730.785329] [<ffffffff814c9c37>] ? down_read+0x17/0x20 Aug 18 01:30:00 [ 2730.785432] [<ffffffffa020a335>] ? __bch_btree_map_nodes+0xc5/0x140 [bcache] Aug 18 01:30:00 [ 2730.785531] [<ffffffffa0209bb0>] ? bch_btree_insert_check_key+0x150/0x150 [bcache] Aug 18 01:30:00 [ 2730.785643] [<ffffffffa020a488>] ? bch_btree_insert+0xd8/0x140 [bcache] Aug 18 01:30:00 [ 2730.785740] [<ffffffff8109f4e0>] ? prepare_to_wait_event+0xf0/0xf0 Aug 18 01:30:00 [ 2730.785853] [<ffffffffa02115df>] ? bch_data_insert_keys+0x2f/0x140 [bcache] Aug 18 01:30:00 [ 2730.785942] [<ffffffff81079bdd>] ? process_one_work+0x16d/0x420 Aug 18 01:30:00 [ 2730.786033] [<ffffffff8107a7e6>] ? worker_thread+0x116/0x3b0 Aug 18 01:30:00 [ 2730.786130] [<ffffffff8107a6d0>] ? rescuer_thread+0x380/0x380 Aug 18 01:30:00 [ 2730.786195] [<ffffffff81080a68>] ? kthread+0xb8/0xd0 Aug 18 01:30:00 [ 2730.786292] [<ffffffff810809b0>] ? kthread_create_on_node+0x170/0x170 Aug 18 01:30:00 [ 2730.786386] [<ffffffff814d2c4c>] ? ret_from_fork+0x7c/0xb0 Aug 18 01:30:00 [ 2730.786502] [<ffffffff810809b0>] ? kthread_create_on_node+0x170/0x170 Aug 18 01:30:00 [ 2730.786600] INFO: task kworker/12:2:720 blocked for more than 120 seconds. Aug 18 01:30:00 [ 2730.786695] Not tainted 3.14-2-amd64 #1 Aug 18 01:30:00 [ 2730.786773] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Aug 18 01:30:00 [ 2730.786871] kworker/12:2 D Aug 18 01:30:00 [ 2730.787065] Workqueue: bcache bch_data_insert_keys [bcache] Aug 18 01:30:00 [ 2730.788164] Call Trace: Aug 18 01:30:00 [ 2730.788240] [<ffffffff814ca39d>] ? rwsem_down_read_failed+0xed/0x130 Aug 18 01:30:00 [ 2730.788323] [<ffffffff8128bf04>] ? call_rwsem_down_read_failed+0x14/0x30 Aug 18 01:30:00 [ 2730.788415] [<ffffffffa0209bb0>] ? bch_btree_insert_check_key+0x150/0x150 [bcache] Aug 18 01:30:00 [ 2730.788530] [<ffffffff814c9c37>] ? down_read+0x17/0x20 Aug 18 01:30:00 [ 2730.788641] [<ffffffffa020a335>] ? __bch_btree_map_nodes+0xc5/0x140 [bcache] Aug 18 01:30:00 [ 2730.788748] [<ffffffffa0209bb0>] ? bch_btree_insert_check_key+0x150/0x150 [bcache] Aug 18 01:30:00 [ 2730.788923] [<ffffffffa020a488>] ? bch_btree_insert+0xd8/0x140 [bcache] Aug 18 01:30:00 [ 2730.789015] [<ffffffff8109f4e0>] ? prepare_to_wait_event+0xf0/0xf0 Aug 18 01:30:00 [ 2730.789105] [<ffffffffa02115df>] ? bch_data_insert_keys+0x2f/0x140 [bcache] Aug 18 01:30:00 [ 2730.789191] [<ffffffff81079bdd>] ? process_one_work+0x16d/0x420 Aug 18 01:30:00 [ 2730.789273] [<ffffffff8107a7e6>] ? worker_thread+0x116/0x3b0 Aug 18 01:30:00 [ 2730.789355] [<ffffffff8107a6d0>] ? rescuer_thread+0x380/0x380 Aug 18 01:30:00 [ 2730.789435] [<ffffffff81080a68>] ? kthread+0xb8/0xd0 Aug 18 01:30:00 [ 2730.789514] [<ffffffff810809b0>] ? kthread_create_on_node+0x170/0x170 Aug 18 01:30:00 [ 2730.789619] [<ffffffff814d2c4c>] ? ret_from_fork+0x7c/0xb0 Aug 18 01:30:00 [ 2730.789704] [<ffffffff810809b0>] ? kthread_create_on_node+0x170/0x170 Aug 18 01:30:00 [ 2730.789787] INFO: task bcache_gc:738 blocked for more than 120 seconds. Aug 18 01:30:00 [ 2730.789866] Not tainted 3.14-2-amd64 #1 Aug 18 01:30:00 [ 2730.789941] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Aug 18 01:30:00 [ 2730.790037] bcache_gc D Aug 18 01:30:00 [ 2730.791224] Call Trace: Aug 18 01:30:00 [ 2730.791315] [<ffffffff814c7f90>] ? schedule_preempt_disabled+0x20/0x70 Aug 18 01:30:00 [ 2730.791398] [<ffffffff814c9a03>] ? __mutex_lock_slowpath+0x133/0x1b0 Aug 18 01:30:00 [ 2730.791483] [<ffffffff814c9a96>] ? mutex_lock+0x16/0x25 Aug 18 01:30:00 [ 2730.791577] [<ffffffffa020534d>] ? btree_node_free+0x2d/0xf0 [bcache] Aug 18 01:30:00 [ 2730.791683] [<ffffffffa0209452>] ? btree_gc_coalesce.isra.27+0x532/0x710 [bcache] Aug 18 01:30:00 [ 2730.791790] [<ffffffffa02047f0>] ? bch_ptr_invalid+0x10/0x10 [bcache] Aug 18 01:30:00 [ 2730.791878] [<ffffffffa02044ab>] ? bch_btree_iter_next_filter+0x1bb/0x350 [bcache] Aug 18 01:30:00 [ 2730.791985] [<ffffffffa0204d50>] ? btree_gc_count_keys+0x40/0x50 [bcache] Aug 18 01:30:00 [ 2730.792075] [<ffffffffa0209914>] ? btree_gc_recurse+0x1b4/0x300 [bcache] Aug 18 01:30:00 [ 2730.792164] [<ffffffffa02044ab>] ? bch_btree_iter_next_filter+0x1bb/0x350 [bcache] Aug 18 01:30:00 [ 2730.792271] [<ffffffffa0209fc7>] ? bch_btree_gc+0x3d7/0x560 [bcache] Aug 18 01:30:00 [ 2730.792355] [<ffffffff8109f4e0>] ? prepare_to_wait_event+0xf0/0xf0 Aug 18 01:30:00 [ 2730.792443] [<ffffffffa020a180>] ? bch_gc_thread+0x30/0x120 [bcache] Aug 18 01:30:00 [ 2730.792539] [<ffffffffa020a150>] ? bch_btree_gc+0x560/0x560 [bcache] Aug 18 01:30:00 [ 2730.792623] [<ffffffff81080a68>] ? kthread+0xb8/0xd0 Aug 18 01:30:00 [ 2730.792702] [<ffffffff810809b0>] ? kthread_create_on_node+0x170/0x170 Aug 18 01:30:00 [ 2730.792784] [<ffffffff814d2c4c>] ? ret_from_fork+0x7c/0xb0 Aug 18 01:30:00 [ 2730.792891] [<ffffffff810809b0>] ? kthread_create_on_node+0x170/0x170 Aug 18 01:30:00 [ 2730.792983] INFO: task kworker/4:2:1581 blocked for more than 120 seconds. Aug 18 01:30:00 [ 2730.793063] Not tainted 3.14-2-amd64 #1 Aug 18 01:30:00 [ 2730.793138] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Aug 18 01:30:00 [ 2730.793234] kworker/4:2 D Aug 18 01:30:00 [ 2730.793429] Workqueue: bcache bch_data_insert_keys [bcache] Aug 18 01:30:00 [ 2730.794492] Call Trace: Aug 18 01:30:00 [ 2730.794574] [<ffffffff814ca39d>] ? rwsem_down_read_failed+0xed/0x130 Aug 18 01:30:00 [ 2730.794657] [<ffffffff8128bf04>] ? call_rwsem_down_read_failed+0x14/0x30 Aug 18 01:30:00 [ 2730.794763] [<ffffffffa0209bb0>] ? bch_btree_insert_check_key+0x150/0x150 [bcache] Aug 18 01:30:00 [ 2730.794864] [<ffffffff814c9c37>] ? down_read+0x17/0x20 Aug 18 01:30:00 [ 2730.794949] [<ffffffffa020a335>] ? __bch_btree_map_nodes+0xc5/0x140 [bcache] Aug 18 01:30:00 [ 2730.795038] [<ffffffffa0209bb0>] ? bch_btree_insert_check_key+0x150/0x150 [bcache] Aug 18 01:30:00 [ 2730.795144] [<ffffffffa020a488>] ? bch_btree_insert+0xd8/0x140 [bcache] Aug 18 01:30:00 [ 2730.795228] [<ffffffff8109f4e0>] ? prepare_to_wait_event+0xf0/0xf0 Aug 18 01:30:00 [ 2730.795313] [<ffffffffa02115df>] ? bch_data_insert_keys+0x2f/0x140 [bcache] Aug 18 01:30:00 [ 2730.795422] [<ffffffff81079bdd>] ? process_one_work+0x16d/0x420 Aug 18 01:30:00 [ 2730.795508] [<ffffffff8107a7e6>] ? worker_thread+0x116/0x3b0 Aug 18 01:30:00 [ 2730.795592] [<ffffffff8107a6d0>] ? rescuer_thread+0x380/0x380 Aug 18 01:30:00 [ 2730.795676] [<ffffffff81080a68>] ? kthread+0xb8/0xd0 Aug 18 01:30:00 [ 2730.795755] [<ffffffff810809b0>] ? kthread_create_on_node+0x170/0x170 Aug 18 01:30:00 [ 2730.795839] [<ffffffff814d2c4c>] ? ret_from_fork+0x7c/0xb0 Aug 18 01:30:00 [ 2730.795919] [<ffffffff810809b0>] ? kthread_create_on_node+0x170/0x170 Aug 18 01:30:00 [ 2730.796157] INFO: task blkback.17.hda:1357 blocked for more than 120 seconds. Aug 18 01:30:00 [ 2730.796238] Not tainted 3.14-2-amd64 #1 Aug 18 01:30:00 [ 2730.796312] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Aug 18 01:30:00 [ 2730.796421] blkback.17.hda D Aug 18 01:30:00 [ 2730.797823] Call Trace: Aug 18 01:30:00 [ 2730.797905] [<ffffffff814ca39d>] ? rwsem_down_read_failed+0xed/0x130 Aug 18 01:30:00 [ 2730.797990] [<ffffffff8128bf04>] ? call_rwsem_down_read_failed+0x14/0x30 Aug 18 01:30:00 [ 2730.798092] [<ffffffffa0210a50>] ? cached_dev_congested+0x160/0x160 [bcache] Aug 18 01:30:00 [ 2730.798177] [<ffffffff814c9c37>] ? down_read+0x17/0x20 Aug 18 01:30:00 [ 2730.798265] [<ffffffffa020a5b5>] ? bch_btree_map_keys+0xc5/0x140 [bcache] Aug 18 01:30:00 [ 2730.798357] [<ffffffffa0210a50>] ? cached_dev_congested+0x160/0x160 [bcache] Aug 18 01:30:00 [ 2730.798475] [<ffffffffa02114cc>] ? cache_lookup+0xdc/0x1c0 [bcache] Aug 18 01:30:00 [ 2730.798564] [<ffffffffa0213602>] ? cached_dev_make_request+0xcc2/0xee0 [bcache] Aug 18 01:30:00 [ 2730.798669] [<ffffffff81255c98>] ? generic_make_request+0xa8/0xf0 Aug 18 01:30:00 [ 2730.798752] [<ffffffff81255d3c>] ? submit_bio+0x5c/0x120 Aug 18 01:30:00 [ 2730.798835] [<ffffffffa051e6c0>] ? dispatch_rw_block_io+0x510/0x8c0 [xen_blkback] Aug 18 01:30:00 [ 2730.798936] [<ffffffffa051ec6c>] ? __do_block_io_op+0x1fc/0x650 [xen_blkback] Aug 18 01:30:00 [ 2730.799088] [<ffffffff8106bea4>] ? try_to_del_timer_sync+0x44/0x60 Aug 18 01:30:00 [ 2730.799174] [<ffffffff8106bf0a>] ? del_timer_sync+0x4a/0x60 Aug 18 01:30:00 [ 2730.799261] [<ffffffffa051f3e0>] ? xen_blkif_schedule+0xd0/0x830 [xen_blkback] Aug 18 01:30:00 [ 2730.799388] [<ffffffff81089621>] ? finish_task_switch+0x41/0xf0 Aug 18 01:30:00 [ 2730.799477] [<ffffffff8109f4e0>] ? prepare_to_wait_event+0xf0/0xf0 Aug 18 01:30:00 [ 2730.799561] [<ffffffffa051f310>] ? xen_blkif_be_int+0x30/0x30 [xen_blkback] Aug 18 01:30:00 [ 2730.799650] [<ffffffff81080a68>] ? kthread+0xb8/0xd0 Aug 18 01:30:00 [ 2730.799733] [<ffffffff810809b0>] ? kthread_create_on_node+0x170/0x170 Aug 18 01:30:00 [ 2730.799816] [<ffffffff814d2c4c>] ? ret_from_fork+0x7c/0xb0 Aug 18 01:30:00 [ 2730.799911] [<ffffffff810809b0>] ? kthread_create_on_node+0x170/0x170 Aug 18 01:30:00 [ 2730.800027] INFO: task blkback.19.hda:2601 blocked for more than 120 seconds. Aug 18 01:30:00 [ 2730.800177] Not tainted 3.14-2-amd64 #1 Aug 18 01:30:00 [ 2730.800253] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Aug 18 01:30:00 [ 2730.800368] blkback.19.hda D Aug 18 01:30:00 [ 2730.801516] Call Trace: Aug 18 01:30:00 [ 2730.801574] [<ffffffff814ca39d>] ? rwsem_down_read_failed+0xed/0x130 Aug 18 01:30:00 [ 2730.801638] [<ffffffff8128bf04>] ? call_rwsem_down_read_failed+0x14/0x30 Aug 18 01:30:00 [ 2730.801709] [<ffffffffa0210a50>] ? cached_dev_congested+0x160/0x160 [bcache] Aug 18 01:30:00 [ 2730.801782] [<ffffffff814c9c37>] ? down_read+0x17/0x20 Aug 18 01:30:00 [ 2730.801861] [<ffffffffa020a5b5>] ? bch_btree_map_keys+0xc5/0x140 [bcache] Aug 18 01:30:00 [ 2730.801936] [<ffffffffa0210a50>] ? cached_dev_congested+0x160/0x160 [bcache] Aug 18 01:30:00 [ 2730.803244] [<ffffffffa02114cc>] ? cache_lookup+0xdc/0x1c0 [bcache] Aug 18 01:30:00 [ 2730.803315] [<ffffffffa0213602>] ? cached_dev_make_request+0xcc2/0xee0 [bcache] Aug 18 01:30:00 [ 2730.803403] [<ffffffff81255c98>] ? generic_make_request+0xa8/0xf0 Aug 18 01:30:00 [ 2730.803467] [<ffffffff81255d3c>] ? submit_bio+0x5c/0x120 Aug 18 01:30:00 [ 2730.803529] [<ffffffffa051e6c0>] ? dispatch_rw_block_io+0x510/0x8c0 [xen_blkback] Aug 18 01:30:00 [ 2730.803610] [<ffffffffa051ec6c>] ? __do_block_io_op+0x1fc/0x650 [xen_blkback] Aug 18 01:30:00 [ 2730.803690] [<ffffffff8106bea4>] ? try_to_del_timer_sync+0x44/0x60 Aug 18 01:30:00 [ 2730.803753] [<ffffffff8106bf0a>] ? del_timer_sync+0x4a/0x60 Aug 18 01:30:00 [ 2730.803816] [<ffffffffa051f3e0>] ? xen_blkif_schedule+0xd0/0x830 [xen_blkback] Aug 18 01:30:00 [ 2730.803896] [<ffffffff81089621>] ? finish_task_switch+0x41/0xf0 Aug 18 01:30:00 [ 2730.803959] [<ffffffff8109f4e0>] ? prepare_to_wait_event+0xf0/0xf0 Aug 18 01:30:00 [ 2730.804023] [<ffffffffa051f310>] ? xen_blkif_be_int+0x30/0x30 [xen_blkback] Aug 18 01:30:00 [ 2730.804087] [<ffffffff81080a68>] ? kthread+0xb8/0xd0 Aug 18 01:30:00 [ 2730.804149] [<ffffffff810809b0>] ? kthread_create_on_node+0x170/0x170 Aug 18 01:30:00 [ 2730.804220] [<ffffffff814d2c4c>] ? ret_from_fork+0x7c/0xb0 Aug 18 01:30:00 [ 2730.804283] [<ffffffff810809b0>] ? kthread_create_on_node+0x170/0x170 Aug 18 01:30:00 [ 2730.804354] INFO: task blkback.24.xvda:4653 blocked for more than 120 seconds. Aug 18 01:30:00 [ 2730.804433] Not tainted 3.14-2-amd64 #1 Aug 18 01:30:00 [ 2730.804491] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Aug 18 01:30:00 [ 2730.804571] blkback.24.xvda D Aug 18 01:30:00 [ 2730.805422] Call Trace: Aug 18 01:30:00 [ 2730.805480] [<ffffffff814ca39d>] ? rwsem_down_read_failed+0xed/0x130 Aug 18 01:30:00 [ 2730.805544] [<ffffffff8128bf04>] ? call_rwsem_down_read_failed+0x14/0x30 Aug 18 01:30:00 [ 2730.805615] [<ffffffffa0210a50>] ? cached_dev_congested+0x160/0x160 [bcache] Aug 18 01:30:00 [ 2730.805679] [<ffffffff814c9c37>] ? down_read+0x17/0x20 Aug 18 01:30:00 [ 2730.805745] [<ffffffffa020a5b5>] ? bch_btree_map_keys+0xc5/0x140 [bcache] Aug 18 01:30:00 [ 2730.805812] [<ffffffffa0210a50>] ? cached_dev_congested+0x160/0x160 [bcache] Aug 18 01:30:00 [ 2730.805880] [<ffffffffa02114cc>] ? cache_lookup+0xdc/0x1c0 [bcache] Aug 18 01:30:00 [ 2730.805946] [<ffffffffa0213602>] ? cached_dev_make_request+0xcc2/0xee0 [bcache] Aug 18 01:30:00 [ 2730.806027] [<ffffffff81255c98>] ? generic_make_request+0xa8/0xf0 Aug 18 01:30:00 [ 2730.806090] [<ffffffff81255d3c>] ? submit_bio+0x5c/0x120 Aug 18 01:30:00 [ 2730.806160] [<ffffffffa051e6c0>] ? dispatch_rw_block_io+0x510/0x8c0 [xen_blkback] Aug 18 01:30:00 [ 2730.806246] [<ffffffffa051ec6c>] ? __do_block_io_op+0x1fc/0x650 [xen_blkback] Aug 18 01:30:00 [ 2730.806330] [<ffffffff8106bea4>] ? try_to_del_timer_sync+0x44/0x60 Aug 18 01:30:00 [ 2730.806393] [<ffffffff8106bf0a>] ? del_timer_sync+0x4a/0x60 Aug 18 01:30:00 [ 2730.806456] [<ffffffffa051f3e0>] ? xen_blkif_schedule+0xd0/0x830 [xen_blkback] Aug 18 01:30:00 [ 2730.806536] [<ffffffff81089621>] ? finish_task_switch+0x41/0xf0 Aug 18 01:30:00 [ 2730.806599] [<ffffffff8109f4e0>] ? prepare_to_wait_event+0xf0/0xf0 Aug 18 01:30:00 [ 2730.806663] [<ffffffffa051f310>] ? xen_blkif_be_int+0x30/0x30 [xen_blkback] Aug 18 01:30:00 [ 2730.806726] [<ffffffff81080a68>] ? kthread+0xb8/0xd0 Aug 18 01:30:00 [ 2730.806788] [<ffffffff810809b0>] ? kthread_create_on_node+0x170/0x170 Aug 18 01:30:00 [ 2730.806851] [<ffffffff814d2c4c>] ? ret_from_fork+0x7c/0xb0 Aug 18 01:30:00 [ 2730.806912] [<ffffffff810809b0>] ? kthread_create_on_node+0x170/0x170 -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
