buffer_io_error: 54 callbacks suppressed Buffer I/O error on dev loop0, logical block 64, async page read Buffer I/O error on dev loop0, logical block 64, lost async page write bond0 (unregistering): Released all slaves kworker/dying (152) used greatest stack depth: 13032 bytes left INFO: task syz-executor5:18635 blocked for more than 120 seconds. Not tainted 4.16.0-rc7+ #367 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor5 D19216 18635 9003 0x80000006 Call Trace: context_switch kernel/sched/core.c:2862 [inline] __schedule+0x8fb/0x1ec0 kernel/sched/core.c:3440 schedule+0xf5/0x430 kernel/sched/core.c:3499 io_schedule+0x1c/0x70 kernel/sched/core.c:5115 wait_on_page_bit_common+0x4b3/0x770 mm/filemap.c:1099 wait_on_page_bit mm/filemap.c:1132 [inline] wait_on_page_writeback include/linux/pagemap.h:546 [inline] __filemap_fdatawait_range+0x282/0x430 mm/filemap.c:533 filemap_fdatawait_range mm/filemap.c:558 [inline] filemap_fdatawait include/linux/fs.h:2591 [inline] filemap_write_and_wait+0x7a/0xd0 mm/filemap.c:624 __sync_blockdev fs/block_dev.c:448 [inline] sync_blockdev.part.30+0x50/0x70 fs/block_dev.c:457 sync_blockdev fs/block_dev.c:444 [inline] __blkdev_put+0x18b/0x760 fs/block_dev.c:1781 blkdev_put+0x85/0x4f0 fs/block_dev.c:1850 blkdev_close+0x8b/0xb0 fs/block_dev.c:1857 __fput+0x327/0x7e0 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x199/0x270 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x9bb/0x1ad0 kernel/exit.c:865 do_group_exit+0x149/0x400 kernel/exit.c:968 get_signal+0x73a/0x16d0 kernel/signal.c:2469 do_signal+0x90/0x1e90 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0x258/0x2f0 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:265 [inline] do_syscall_64+0x6ec/0x940 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x454879 RSP: 002b:00007f38508f1c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: 0000000000041000 RBX: 00007f38508f26d4 RCX: 0000000000454879 RDX: 00000000200000c0 RSI: 0000000000000017 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000102000001 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004bc R14: 00000000006f8240 R15: 0000000000000000 Showing all locks held in the system: 3 locks held by kworker/u4:1/21: #0: ((wq_completion)"writeback"){+.+.}, at: [<000000002d2d5bf1>] work_static include/linux/workqueue.h:198 [inline] #0: ((wq_completion)"writeback"){+.+.}, at: [<000000002d2d5bf1>] set_work_data kernel/workqueue.c:619 [inline] #0: ((wq_completion)"writeback"){+.+.}, at: [<000000002d2d5bf1>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: ((wq_completion)"writeback"){+.+.}, at: [<000000002d2d5bf1>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084 #1: ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: [<00000000c6b6968f>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088 #2: (&type->s_umount_key#33){.+.+}, at: [<000000008ee249c1>] trylock_super+0x20/0x100 fs/super.c:395 2 locks held by khungtaskd/801: #0: (rcu_read_lock){....}, at: [<00000000738600b4>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: (rcu_read_lock){....}, at: [<00000000738600b4>] watchdog+0x1c5/0xd60 kernel/hung_task.c:249 #1: (tasklist_lock){.+.+}, at: [<000000001342ae21>] debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470 1 lock held by rsyslogd/4069: #0: (&f->f_pos_lock){+.+.}, at: [<00000000b898f192>] __fdget_pos+0x12b/0x190 fs/file.c:765 2 locks held by getty/4160: #0: (&tty->ldisc_sem){++++}, at: [<000000006d805dfd>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005853fdf4>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4161: #0: (&tty->ldisc_sem){++++}, at: [<000000006d805dfd>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005853fdf4>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4162: #0: (&tty->ldisc_sem){++++}, at: [<000000006d805dfd>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005853fdf4>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4163: #0: (&tty->ldisc_sem){++++}, at: [<000000006d805dfd>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005853fdf4>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4164: #0: (&tty->ldisc_sem){++++}, at: [<000000006d805dfd>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005853fdf4>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4165: #0: (&tty->ldisc_sem){++++}, at: [<000000006d805dfd>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005853fdf4>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4166: #0: (&tty->ldisc_sem){++++}, at: [<000000006d805dfd>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005853fdf4>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 4 locks held by kworker/1:6/9050: #0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<000000002d2d5bf1>] work_static include/linux/workqueue.h:198 [inline] #0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<000000002d2d5bf1>] set_work_data kernel/workqueue.c:619 [inline] #0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<000000002d2d5bf1>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<000000002d2d5bf1>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084 #1: ((work_completion)(&css->destroy_work)#3){+.+.}, at: [<00000000c6b6968f>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088 #2: (cpu_hotplug_lock.rw_sem){++++}, at: [<0000000054b75989>] get_online_cpus include/linux/cpu.h:124 [inline] #2: (cpu_hotplug_lock.rw_sem){++++}, at: [<0000000054b75989>] memcg_destroy_kmem_caches+0xf/0x80 mm/slab_common.c:771 #3: (slab_mutex){+.+.}, at: [<000000006046d7a7>] memcg_destroy_kmem_caches+0x24/0x80 mm/slab_common.c:774 1 lock held by syz-executor5/18635: #0: (&bdev->bd_mutex){+.+.}, at: [<000000008c1ed5c8>] __blkdev_put+0xbc/0x760 fs/block_dev.c:1775 1 lock held by blkid/18652: #0: (&bdev->bd_mutex){+.+.}, at: [<00000000f3643ecc>] __blkdev_get+0x176/0x13b0 fs/block_dev.c:1458 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 801 Comm: khungtaskd Not tainted 4.16.0-rc7+ #367 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x24d lib/dump_stack.c:53 nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x123/0x180 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] check_hung_task kernel/hung_task.c:132 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline] watchdog+0x90c/0xd60 kernel/hung_task.c:249 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8057 Comm: kworker/1:4 Not tainted 4.16.0-rc7+ #367 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events rht_deferred_worker RIP: 0010:mark_held_locks+0xaf/0x100 kernel/locking/lockdep.c:2807 RSP: 0018:ffff88019b07f1d8 EFLAGS: 00000086 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 1ffffffff10204c4 RDX: ffff8801b1906e58 RSI: 1ffff10036320dcb RDI: ffffffff88102620 RBP: ffff88019b07f210 R08: 1ffff1003360fe18 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000007 R13: ffff8801b19065c0 R14: dffffc0000000000 R15: ffff8801b1906e38 FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000dca000 CR3: 0000000006e22005 CR4: 00000000001606e0 DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __trace_hardirqs_on_caller kernel/locking/lockdep.c:2836 [inline] trace_hardirqs_on_caller+0x421/0x5c0 kernel/locking/lockdep.c:2883 trace_hardirqs_on+0xd/0x10 kernel/locking/lockdep.c:2890 queue_work_on+0xc2/0x1c0 kernel/workqueue.c:1492 queue_work include/linux/workqueue.h:488 [inline] schedule_work include/linux/workqueue.h:546 [inline] rht_deferred_worker+0x2ba/0x1cd0 lib/rhashtable.c:436 process_one_work+0xc47/0x1bb0 kernel/workqueue.c:2113 worker_thread+0x223/0x1990 kernel/workqueue.c:2247 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406 Code: 83 e2 07 42 0f b6 04 30 38 d0 7f 04 84 c0 75 52 0f b6 46 22 44 89 e2 a8 03 0f 44 d1 a8 04 74 12 4c 89 ef 89 4d d0 e8 21 eb ff ff <85> c0 8b 4d d0 74 11 83 c3 01 41 39 9d 70 08 00 00 7f a9 b8 01