INFO: task kworker/u4:6:10223 blocked for more than 143 seconds. Not tainted 5.14.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:6 state:D stack:26072 pid:10223 ppid: 2 flags:0x00004000 Workqueue: events_unbound fsnotify_connector_destroy_workfn Call Trace: context_switch kernel/sched/core.c:4681 [inline] __schedule+0x907/0x26b0 kernel/sched/core.c:5938 schedule+0xd3/0x270 kernel/sched/core.c:6017 schedule_timeout+0x19d/0x250 kernel/time/timer.c:1857 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x176/0x280 kernel/sched/completion.c:138 __synchronize_srcu+0x1f4/0x290 kernel/rcu/srcutree.c:930 fsnotify_connector_destroy_workfn+0x4a/0xa0 fs/notify/mark.c:164 process_one_work+0x84c/0x13d0 kernel/workqueue.c:2276 worker_thread+0x598/0x1040 kernel/workqueue.c:2422 kthread+0x38b/0x460 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Showing all locks held in the system: 2 locks held by kworker/u4:1/10: #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:620 [inline] #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:617 [inline] #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x771/0x13d0 kernel/workqueue.c:2247 #1: ffffc90000cf7db8 ((reaper_work).work){+.+.}-{0:0}, at: process_one_work+0x79e/0x13d0 kernel/workqueue.c:2251 5 locks held by kworker/u4:3/183: 1 lock held by khungtaskd/1552: #0: ffffffff8ab72940 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by khugepaged/1661: #0: ffffffff8ac4fcc8 (lock#6){+.+.}-{3:3}, at: __lru_add_drain_all+0x5a/0x6e0 mm/swap.c:791 3 locks held by kworker/0:3/3167: 1 lock held by in:imklog/8092: #0: ffff88802bcdc0f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x9c/0xb0 fs/file.c:974 3 locks held by kworker/1:3/8666: 3 locks held by syz-executor.2/8823: #0: ffff88802c69cff0 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0xa8/0xee0 net/bluetooth/hci_core.c:1728 #1: ffff88802c69c078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_do_close+0x1d4/0xee0 net/bluetooth/hci_core.c:1765 #2: ffffffff8c401dc8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1498 [inline] #2: ffffffff8c401dc8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xb9/0x210 net/bluetooth/hci_conn.c:1608 4 locks held by syz-executor.3/8825: #0: ffff88802cbbcff0 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0xa8/0xee0 net/bluetooth/hci_core.c:1728 #1: ffff88802cbbc078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_do_close+0x1d4/0xee0 net/bluetooth/hci_core.c:1765 #2: ffffffff8c401dc8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1498 [inline] #2: ffffffff8c401dc8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xb9/0x210 net/bluetooth/hci_conn.c:1608 #3: ffffffff8ab7bda8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline] #3: ffffffff8ab7bda8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x2d5/0x620 kernel/rcu/tree_exp.h:837 3 locks held by syz-executor.5/8826: #0: ffff88802cbb8ff0 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0xa8/0xee0 net/bluetooth/hci_core.c:1728 #1: ffff88802cbb8078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_do_close+0x1d4/0xee0 net/bluetooth/hci_core.c:1765 #2: ffffffff8c401dc8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1498 [inline] #2: ffffffff8c401dc8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xb9/0x210 net/bluetooth/hci_conn.c:1608 3 locks held by syz-executor.4/8830: #0: ffff88801fa60ff0 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0xa8/0xee0 net/bluetooth/hci_core.c:1728 #1: ffff88801fa60078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_do_close+0x1d4/0xee0 net/bluetooth/hci_core.c:1765 #2: ffffffff8c401dc8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1498 [inline] #2: ffffffff8c401dc8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xb9/0x210 net/bluetooth/hci_conn.c:1608 3 locks held by syz-executor.0/8832: #0: ffff88801fa8cff0 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0xa8/0xee0 net/bluetooth/hci_core.c:1728 #1: ffff88801fa8c078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_do_close+0x1d4/0xee0 net/bluetooth/hci_core.c:1765 #2: ffffffff8c401dc8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1498 [inline] #2: ffffffff8c401dc8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xb9/0x210 net/bluetooth/hci_conn.c:1608 3 locks held by kworker/1:6/10107: #0: ffff88800fc64d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88800fc64d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:620 [inline] #0: ffff88800fc64d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff88800fc64d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:617 [inline] #0: ffff88800fc64d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ffff88800fc64d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x771/0x13d0 kernel/workqueue.c:2247 #1: ffffc9000aa37db8 (free_ipc_work){+.+.}-{0:0}, at: process_one_work+0x79e/0x13d0 kernel/workqueue.c:2251 #2: ffffffff8ab7bda8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline] #2: ffffffff8ab7bda8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x2d5/0x620 kernel/rcu/tree_exp.h:837 2 locks held by kworker/u4:6/10223: #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:620 [inline] #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:617 [inline] #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ffff88800fc69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x771/0x13d0 kernel/workqueue.c:2247 #1: ffffc9008af77db8 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work+0x79e/0x13d0 kernel/workqueue.c:2251 1 lock held by syz-executor672/10358: #0: ffffffff8ac8eca8 (pcpu_drain_mutex){+.+.}-{3:3}, at: __drain_all_pages+0x4f/0x6c0 mm/page_alloc.c:3204 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1552 Comm: khungtaskd Not tainted 5.14.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x57/0x7d lib/dump_stack.c:105 nmi_cpu_backtrace.cold+0x30/0x99 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x11f/0x170 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0x92e/0xc40 kernel/hung_task.c:295 kthread+0x38b/0x460 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 13 Comm: ksoftirqd/0 Not tainted 5.14.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0x1049/0x5410 kernel/locking/lockdep.c:4985 Code: 10 be 08 00 00 00 48 8d 43 3f 48 85 db 48 0f 49 c3 48 c1 f8 06 48 8d 3c c5 e0 58 dd 8e e8 ff b4 53 00 48 0f a3 1d 27 b9 8a 0d <0f> 82 c7 f8 ff ff e8 2c 50 2e 02 85 c0 0f 84 f1 fd ff ff 48 c7 c0 RSP: 0018:ffffc90000d27ac0 EFLAGS: 00000047 RAX: 0000000000000001 RBX: 000000000000005c RCX: ffffffff81529fb1 RDX: fffffbfff1dbab1e RSI: 0000000000000008 RDI: ffffffff8edd58e8 RBP: ffff888010f78a12 R08: 0000000000000000 R09: ffffffff8edd58ef R10: fffffbfff1dbab1d R11: 000000000007a088 R12: ffff888010f789f0 R13: ffff888010f78000 R14: 0000000000000000 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f842a801000 CR3: 000000000a88e000 CR4: 0000000000350ef0 Call Trace: lock_acquire kernel/locking/lockdep.c:5625 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 expire_timers kernel/time/timer.c:1462 [inline] __run_timers.part.0+0x3b8/0x890 kernel/time/timer.c:1734 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0x9c/0x190 kernel/time/timer.c:1747 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 run_ksoftirqd kernel/softirq.c:920 [inline] run_ksoftirqd+0x2d/0x60 kernel/softirq.c:912 smpboot_thread_fn+0x548/0x8c0 kernel/smpboot.c:164 kthread+0x38b/0x460 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: 10 be 08 00 00 00 adc %bh,0x8(%rsi) 6: 48 8d 43 3f lea 0x3f(%rbx),%rax a: 48 85 db test %rbx,%rbx d: 48 0f 49 c3 cmovns %rbx,%rax 11: 48 c1 f8 06 sar $0x6,%rax 15: 48 8d 3c c5 e0 58 dd lea -0x7122a720(,%rax,8),%rdi 1c: 8e 1d: e8 ff b4 53 00 callq 0x53b521 22: 48 0f a3 1d 27 b9 8a bt %rbx,0xd8ab927(%rip) # 0xd8ab951 29: 0d * 2a: 0f 82 c7 f8 ff ff jb 0xfffff8f7 <-- trapping instruction 30: e8 2c 50 2e 02 callq 0x22e5061 35: 85 c0 test %eax,%eax 37: 0f 84 f1 fd ff ff je 0xfffffe2e 3d: 48 rex.W 3e: c7 .byte 0xc7 3f: c0 .byte 0xc0