INFO: task kworker/u4:0:7 blocked for more than 140 seconds. Not tainted 5.0.0-rc4+ #50 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:0 D24008 7 2 0x80000000 Workqueue: events_unbound fsnotify_connector_destroy_workfn Call Trace: context_switch kernel/sched/core.c:2844 [inline] __schedule+0x897/0x1e60 kernel/sched/core.c:3485 schedule+0xfe/0x350 kernel/sched/core.c:3529 schedule_timeout+0x1d3/0x250 kernel/time/timer.c:1779 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x457/0x810 kernel/sched/completion.c:136 __synchronize_srcu+0x201/0x2d0 kernel/rcu/srcutree.c:946 synchronize_srcu+0x41d/0x5af kernel/rcu/srcutree.c:1024 fsnotify_connector_destroy_workfn+0x4e/0xa0 fs/notify/mark.c:176 process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153 worker_thread+0x143/0x14a0 kernel/workqueue.c:2296 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 INFO: task kworker/u4:2:24 blocked for more than 140 seconds. Not tainted 5.0.0-rc4+ #50 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:2 D24584 24 2 0x80000000 Workqueue: events_unbound fsnotify_mark_destroy_workfn Call Trace: context_switch kernel/sched/core.c:2844 [inline] __schedule+0x897/0x1e60 kernel/sched/core.c:3485 schedule+0xfe/0x350 kernel/sched/core.c:3529 schedule_timeout+0x1d3/0x250 kernel/time/timer.c:1779 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x457/0x810 kernel/sched/completion.c:136 __synchronize_srcu+0x201/0x2d0 kernel/rcu/srcutree.c:946 synchronize_srcu_expedited kernel/rcu/srcutree.c:971 [inline] synchronize_srcu+0x343/0x5af kernel/rcu/srcutree.c:1022 fsnotify_mark_destroy_workfn+0x1af/0x540 fs/notify/mark.c:799 process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153 worker_thread+0x143/0x14a0 kernel/workqueue.c:2296 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 INFO: task syz-executor5:8289 blocked for more than 140 seconds. Not tainted 5.0.0-rc4+ #50 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor5 D20440 8289 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2844 [inline] __schedule+0x897/0x1e60 kernel/sched/core.c:3485 schedule+0xfe/0x350 kernel/sched/core.c:3529 _synchronize_rcu_expedited.constprop.0+0x57a/0x8d0 kernel/rcu/tree_exp.h:640 synchronize_rcu_expedited+0x27/0xa0 kernel/rcu/tree_exp.h:762 namespace_unlock+0x1ac/0x200 fs/namespace.c:1361 do_umount fs/namespace.c:1563 [inline] ksys_umount+0x89a/0x1340 fs/namespace.c:1658 __do_sys_umount fs/namespace.c:1669 [inline] __se_sys_umount fs/namespace.c:1667 [inline] __x64_sys_umount+0x54/0x80 fs/namespace.c:1667 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45aad7 Code: Bad RIP value. RSP: 002b:00007ffe5a312e08 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045aad7 RDX: 0000000000402eb0 RSI: 0000000000000002 RDI: 00007ffe5a312eb0 RBP: 000000000000009d R08: 0000000000000000 R09: 000000000000000a R10: 0000000000000005 R11: 0000000000000202 R12: 00007ffe5a313f40 R13: 0000000002016940 R14: 0000000000000000 R15: 0000000000000005 INFO: task syz-executor2:9860 blocked for more than 140 seconds. Not tainted 5.0.0-rc4+ #50 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D25416 9860 8277 0x00000004 Call Trace: context_switch kernel/sched/core.c:2844 [inline] __schedule+0x897/0x1e60 kernel/sched/core.c:3485 schedule+0xfe/0x350 kernel/sched/core.c:3529 schedule_timeout+0x1d3/0x250 kernel/time/timer.c:1779 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x457/0x810 kernel/sched/completion.c:136 __synchronize_srcu+0x201/0x2d0 kernel/rcu/srcutree.c:946 synchronize_srcu_expedited+0x19/0x20 kernel/rcu/srcutree.c:971 install_new_memslots+0x1f6/0x480 arch/x86/kvm/../../../virt/kvm/kvm_main.c:886 __kvm_set_memory_region+0x1b64/0x2c40 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1060 kvm_set_memory_region+0x2f/0x60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1083 kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1095 [inline] kvm_vm_ioctl+0xafa/0x1fe0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3112 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x107b/0x17d0 fs/ioctl.c:696 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ef7 Code: Bad RIP value. RSP: 002b:00007f90a57ac098 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000457ef7 RDX: 00007f90a57ac510 RSI: 000000004020ae46 RDI: 0000000000000004 RBP: 0000000020fe8000 R08: 00007f90a57ac0a0 R09: 000000000073bf00 R10: 0000000000000005 R11: 0000000000000246 R12: 00000000fec00000 R13: 0000000000000004 R14: 00000000004dbbd8 R15: 00000000ffffffff Showing all locks held in the system: 2 locks held by kworker/u4:0/7: #0: 0000000025cd11c4 ((wq_completion)"events_unbound"){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 0000000025cd11c4 ((wq_completion)"events_unbound"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 0000000025cd11c4 ((wq_completion)"events_unbound"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 0000000025cd11c4 ((wq_completion)"events_unbound"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 0000000025cd11c4 ((wq_completion)"events_unbound"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 0000000025cd11c4 ((wq_completion)"events_unbound"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 0000000025cd11c4 ((wq_completion)"events_unbound"){+.+.}, at: process_one_work+0xbc7/0x1ce0 kernel/workqueue.c:2124 #1: 000000009124271f (connector_reaper_work){+.+.}, at: process_one_work+0xc1d/0x1ce0 kernel/workqueue.c:2128 2 locks held by kworker/u4:2/24: #0: 0000000025cd11c4 ((wq_completion)"events_unbound"){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 0000000025cd11c4 ((wq_completion)"events_unbound"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 0000000025cd11c4 ((wq_completion)"events_unbound"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 0000000025cd11c4 ((wq_completion)"events_unbound"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 0000000025cd11c4 ((wq_completion)"events_unbound"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 0000000025cd11c4 ((wq_completion)"events_unbound"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 0000000025cd11c4 ((wq_completion)"events_unbound"){+.+.}, at: process_one_work+0xbc7/0x1ce0 kernel/workqueue.c:2124 #1: 00000000f36be56d ((reaper_work).work){+.+.}, at: process_one_work+0xc1d/0x1ce0 kernel/workqueue.c:2128 1 lock held by khungtaskd/1040: #0: 0000000002ff5f18 (rcu_read_lock){....}, at: debug_show_all_locks+0xc6/0x41d kernel/locking/lockdep.c:4389 1 lock held by rsyslogd/8146: #0: 00000000b9e4560f (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1b3/0x1f0 fs/file.c:795 2 locks held by getty/8236: #0: 0000000055b2408f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000003e5e2b9 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/8237: #0: 000000003887be20 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000007562f8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/8238: #0: 00000000f981af14 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000a91ddaf7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/8239: #0: 00000000b19a66b6 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000008ce80759 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/8240: #0: 00000000e01d7f77 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000007bf9a8c2 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/8241: #0: 00000000b58b1673 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000619c434a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 2 locks held by getty/8242: #0: 00000000e724f4a6 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000000aff8204 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 4 locks held by kworker/0:3/8285: 1 lock held by syz-executor5/8289: #0: 00000000b99d6048 (rcu_state.exp_mutex){+.+.}, at: exp_funnel_lock kernel/rcu/tree_exp.h:296 [inline] #0: 00000000b99d6048 (rcu_state.exp_mutex){+.+.}, at: _synchronize_rcu_expedited.constprop.0+0x6e9/0x8d0 kernel/rcu/tree_exp.h:622 1 lock held by syz-executor2/9860: #0: 00000000bea7dfa9 (&kvm->slots_lock){+.+.}, at: kvm_set_memory_region+0x24/0x60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1082 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1040 Comm: khungtaskd Not tainted 5.0.0-rc4+ #50 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1db/0x2d0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1be/0x236 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:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0xbbb/0x1170 kernel/hung_task.c:287 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8285 Comm: kworker/0:3 Not tainted 5.0.0-rc4+ #50 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events rtc_timer_do_work RIP: 0010:arch_local_save_flags arch/x86/include/asm/paravirt.h:761 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/paravirt.h:783 [inline] RIP: 0010:lock_is_held_type+0x86/0x210 kernel/locking/lockdep.c:3875 Code: 82 92 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 69 01 00 00 48 83 3d d9 1a 2f 08 00 0f 84 20 01 00 00 9c <58> 0f 1f 44 00 00 48 c7 c2 38 82 92 89 48 89 c3 48 b8 00 00 00 00 RSP: 0018:ffff88805b7a76f0 EFLAGS: 00000282 RAX: 1ffffffff1325045 RBX: ffff88805b798040 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 00000000ffffffff RDI: ffff88805b7988bc RBP: ffff88805b7a7718 R08: ffff88805b798040 R09: ffffed1015cc5b90 R10: ffffed1015cc5b8f R11: ffff8880ae62dc7b R12: ffffffff899a41c0 R13: ffff88809e004b60 R14: dffffc0000000000 R15: ffff88809e004bb0 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd6a1e6c7c CR3: 0000000092b84000 CR4: 00000000001426f0 Call Trace: lock_is_held include/linux/lockdep.h:337 [inline] rcu_read_lock_sched_held+0x110/0x130 kernel/rcu/update.c:117 trace_rtc_timer_dequeue include/trace/events/rtc.h:189 [inline] trace_rtc_timer_dequeue include/trace/events/rtc.h:189 [inline] rtc_timer_do_work+0x9f3/0x1150 drivers/rtc/interface.c:906 process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153 worker_thread+0x143/0x14a0 kernel/workqueue.c:2296 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352