bond0 (unregistering): Released all slaves INFO: task kworker/1:3:5636 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. kworker/1:3 D21352 5636 2 0x80000000 Workqueue: events cgwb_release_workfn 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 bit_wait+0x18/0x90 kernel/sched/wait_bit.c:250 __wait_on_bit+0x88/0x130 kernel/sched/wait_bit.c:51 out_of_line_wait_on_bit+0x204/0x3a0 kernel/sched/wait_bit.c:64 wait_on_bit include/linux/wait_bit.h:84 [inline] wb_shutdown+0x335/0x430 mm/backing-dev.c:377 cgwb_release_workfn+0x8b/0x61d mm/backing-dev.c:520 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 Showing all locks held in the system: 2 locks held by khungtaskd/801: #0: (rcu_read_lock){....}, at: [<00000000f7c074f5>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: (rcu_read_lock){....}, at: [<00000000f7c074f5>] watchdog+0x1c5/0xd60 kernel/hung_task.c:249 #1: (tasklist_lock){.+.+}, at: [<000000003b0c22ae>] debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470 4 locks held by rs:main Q:Reg/4060: #0: (&f->f_pos_lock){+.+.}, at: [<00000000adae8a11>] __fdget_pos+0x12b/0x190 fs/file.c:765 #1: (sb_writers#4){.+.+}, at: [<00000000e1b7a7a9>] file_start_write include/linux/fs.h:2709 [inline] #1: (sb_writers#4){.+.+}, at: [<00000000e1b7a7a9>] vfs_write+0x407/0x510 fs/read_write.c:543 #2: (&sb->s_type->i_mutex_key#10){++++}, at: [<000000001201728b>] inode_trylock include/linux/fs.h:733 [inline] #2: (&sb->s_type->i_mutex_key#10){++++}, at: [<000000001201728b>] ext4_file_write_iter+0x21f/0x10c0 fs/ext4/file.c:232 #3: (jbd2_handle){++++}, at: [<00000000d7698019>] start_this_handle+0x488/0x1080 fs/jbd2/transaction.c:385 1 lock held by rsyslogd/4062: #0: (&f->f_pos_lock){+.+.}, at: [<00000000adae8a11>] __fdget_pos+0x12b/0x190 fs/file.c:765 2 locks held by getty/4153: #0: (&tty->ldisc_sem){++++}, at: [<0000000084271c68>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000251fa650>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4154: #0: (&tty->ldisc_sem){++++}, at: [<0000000084271c68>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000251fa650>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4155: #0: (&tty->ldisc_sem){++++}, at: [<0000000084271c68>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000251fa650>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4156: #0: (&tty->ldisc_sem){++++}, at: [<0000000084271c68>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000251fa650>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4157: #0: (&tty->ldisc_sem){++++}, at: [<0000000084271c68>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000251fa650>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4158: #0: (&tty->ldisc_sem){++++}, at: [<0000000084271c68>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000251fa650>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4159: #0: (&tty->ldisc_sem){++++}, at: [<0000000084271c68>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000251fa650>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 3 locks held by syz-fuzzer/4179: #0: (sb_writers#4){.+.+}, at: [<00000000df9f2293>] sb_start_write include/linux/fs.h:1548 [inline] #0: (sb_writers#4){.+.+}, at: [<00000000df9f2293>] mnt_want_write+0x3f/0xb0 fs/namespace.c:386 #1: (&type->i_mutex_dir_key/1){+.+.}, at: [<0000000003209eed>] inode_lock_nested include/linux/fs.h:748 [inline] #1: (&type->i_mutex_dir_key/1){+.+.}, at: [<0000000003209eed>] filename_create+0x192/0x520 fs/namei.c:3625 #2: (jbd2_handle){++++}, at: [<00000000d7698019>] start_this_handle+0x488/0x1080 fs/jbd2/transaction.c:385 2 locks held by kworker/1:3/5636: #0: ((wq_completion)"events"){+.+.}, at: [<00000000f25e88ef>] work_static include/linux/workqueue.h:198 [inline] #0: ((wq_completion)"events"){+.+.}, at: [<00000000f25e88ef>] set_work_data kernel/workqueue.c:619 [inline] #0: ((wq_completion)"events"){+.+.}, at: [<00000000f25e88ef>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: ((wq_completion)"events"){+.+.}, at: [<00000000f25e88ef>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084 #1: ((work_completion)(&wb->release_work)){+.+.}, at: [<00000000f4a7ffb8>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088 5 locks held by kworker/0:4/5827: #0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<00000000f25e88ef>] work_static include/linux/workqueue.h:198 [inline] #0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<00000000f25e88ef>] set_work_data kernel/workqueue.c:619 [inline] #0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<00000000f25e88ef>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<00000000f25e88ef>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084 #1: ((work_completion)(&css->destroy_work)){+.+.}, at: [<00000000f4a7ffb8>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088 #2: (cgroup_mutex){+.+.}, at: [<0000000085970b40>] css_killed_work_fn+0x93/0x5c0 kernel/cgroup/cgroup.c:4967 #3: (cpu_hotplug_lock.rw_sem){++++}, at: [<000000008f7d1122>] get_online_cpus include/linux/cpu.h:124 [inline] #3: (cpu_hotplug_lock.rw_sem){++++}, at: [<000000008f7d1122>] memcg_deactivate_kmem_caches+0x21/0xf0 mm/slab_common.c:747 #4: (slab_mutex){+.+.}, at: [<000000006437ca3a>] memcg_deactivate_kmem_caches+0x2f/0xf0 mm/slab_common.c:750 3 locks held by kworker/1:5/5928: #0: ((wq_completion)"events"){+.+.}, at: [<00000000f25e88ef>] work_static include/linux/workqueue.h:198 [inline] #0: ((wq_completion)"events"){+.+.}, at: [<00000000f25e88ef>] set_work_data kernel/workqueue.c:619 [inline] #0: ((wq_completion)"events"){+.+.}, at: [<00000000f25e88ef>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: ((wq_completion)"events"){+.+.}, at: [<00000000f25e88ef>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084 #1: (slab_caches_to_rcu_destroy_work){+.+.}, at: [<00000000f4a7ffb8>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088 #2: (slab_mutex){+.+.}, at: [<000000004234041a>] slab_caches_to_rcu_destroy_workfn+0x25/0xc0 mm/slab_common.c:556 4 locks held by kworker/1:6/7146: #0: ((wq_completion)"memcg_kmem_cache"){+.+.}, at: [<00000000f25e88ef>] work_static include/linux/workqueue.h:198 [inline] #0: ((wq_completion)"memcg_kmem_cache"){+.+.}, at: [<00000000f25e88ef>] set_work_data kernel/workqueue.c:619 [inline] #0: ((wq_completion)"memcg_kmem_cache"){+.+.}, at: [<00000000f25e88ef>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: ((wq_completion)"memcg_kmem_cache"){+.+.}, at: [<00000000f25e88ef>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084 #1: ((work_completion)(&cw->work)){+.+.}, at: [<00000000f4a7ffb8>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088 #2: (cpu_hotplug_lock.rw_sem){++++}, at: [<00000000215cae44>] get_online_cpus include/linux/cpu.h:124 [inline] #2: (cpu_hotplug_lock.rw_sem){++++}, at: [<00000000215cae44>] memcg_create_kmem_cache+0x16/0x170 mm/slab_common.c:619 #3: (slab_mutex){+.+.}, at: [<000000004a052fa4>] memcg_create_kmem_cache+0x24/0x170 mm/slab_common.c:622 ============================================= 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: 18347 Comm: kworker/1:9 Not tainted 4.16.0-rc7+ #367 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lookup_object lib/debugobjects.c:133 [inline] RIP: 0010:debug_object_deactivate+0x1b4/0x560 lib/debugobjects.c:502 RSP: 0018:ffff8801a1bef480 EFLAGS: 00000046 RAX: 0000000000000082 RBX: ffff8801d1b7dc08 RCX: dffffc0000000000 RDX: ffffffff877029e8 RSI: 1ffff1003a36fb84 RDI: ffff8801d1b7dc20 RBP: ffff8801a1bef550 R08: 1ffff1003437ddcd R09: 000000000000000c R10: ffff8801a1bef330 R11: 0000000000000000 R12: 1ffff1003437de94 R13: 0000000000000043 R14: ffff8801a1bef520 R15: ffffffff8861b088 FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000130 CR3: 0000000006e22001 CR4: 00000000001606e0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: debug_work_deactivate kernel/workqueue.c:498 [inline] process_one_work+0x550/0x1bb0 kernel/workqueue.c:2050 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: ee 03 80 3c 0e 00 0f 85 ce 02 00 00 48 8b 1b 48 85 db 0f 84 88 00 00 00 48 8d 7b 18 41 83 c5 01 48 89 fe 48 c1 ee 03 80 3c 0e 00 <0f> 85 75 02 00 00 48 3b 53 18 75 c4 48 8d 7b 10 48 ba 00 00 00