INFO: task syz-executor364:19070 can't die for more than 143 seconds. syz-executor364 D28160 19070 8870 0x00004004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x8e1/0x1f30 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 schedule_timeout+0x717/0xc50 kernel/time/timer.c:1871 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+0x29c/0x440 kernel/sched/completion.c:136 io_wq_destroy+0x22a/0x450 fs/io-wq.c:1068 io_finish_async+0x128/0x1b0 fs/io_uring.c:3423 io_ring_ctx_free fs/io_uring.c:4220 [inline] io_ring_ctx_wait_and_kill+0x2b7/0x810 fs/io_uring.c:4293 io_uring_release+0x42/0x50 fs/io_uring.c:4301 __fput+0x2ff/0x890 fs/file_table.c:280 ____fput+0x16/0x20 fs/file_table.c:313 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x676/0x790 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x401f90 Code: 9a 0f 49 a0 29 ea 4a 0e 0b 29 fc b1 ec 4e 37 5b dd 29 8a 27 dd 11 5d f1 5c a3 c4 ef b7 5c 29 ee c9 41 24 ba b7 13 54 c7 01 aa <81> 88 ee c1 f0 ba 3c 68 a5 de 70 42 32 e9 9e f3 72 28 7f 05 c2 91 RSP: 002b:00007ffea24185b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000401f90 RDX: 0000000000401f30 RSI: 00000000200005c0 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000004 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000006f1 R13: 0000000000000003 R14: 0000000000000004 R15: 0000000000000000 INFO: task syz-executor364:19070 blocked for more than 143 seconds. Not tainted 5.4.0-rc7-next-20191115 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor364 D28160 19070 8870 0x00004004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x8e1/0x1f30 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 schedule_timeout+0x717/0xc50 kernel/time/timer.c:1871 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+0x29c/0x440 kernel/sched/completion.c:136 io_wq_destroy+0x22a/0x450 fs/io-wq.c:1068 io_finish_async+0x128/0x1b0 fs/io_uring.c:3423 io_ring_ctx_free fs/io_uring.c:4220 [inline] io_ring_ctx_wait_and_kill+0x2b7/0x810 fs/io_uring.c:4293 io_uring_release+0x42/0x50 fs/io_uring.c:4301 __fput+0x2ff/0x890 fs/file_table.c:280 ____fput+0x16/0x20 fs/file_table.c:313 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x676/0x790 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x401f90 Code: 9a 0f 49 a0 29 ea 4a 0e 0b 29 fc b1 ec 4e 37 5b dd 29 8a 27 dd 11 5d f1 5c a3 c4 ef b7 5c 29 ee c9 41 24 ba b7 13 54 c7 01 aa <81> 88 ee c1 f0 ba 3c 68 a5 de 70 42 32 e9 9e f3 72 28 7f 05 c2 91 RSP: 002b:00007ffea24185b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000401f90 RDX: 0000000000401f30 RSI: 00000000200005c0 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000004 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000006f1 R13: 0000000000000003 R14: 0000000000000004 R15: 0000000000000000 Showing all locks held in the system: 1 lock held by khungtaskd/1079: #0: ffffffff88faccc0 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 kernel/locking/lockdep.c:5334 1 lock held by rsyslogd/8748: #0: ffff8880a8f1b8e0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/8837: #0: ffff8880933b0090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f292e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/8838: #0: ffff8880923e6090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f492e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/8839: #0: ffff88809a7c6090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f212e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/8840: #0: ffff8880a8888090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f412e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/8841: #0: ffff88809597a090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f352e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/8842: #0: ffff8880942a3090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f452e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/8843: #0: ffff88809ce43090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f192e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1079 Comm: khungtaskd Not tainted 5.4.0-rc7-next-20191115 #0 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+0x197/0x210 lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b 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:269 [inline] watchdog+0xc8f/0x1350 kernel/hung_task.c:353 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc7-next-20191115 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0x264/0x4a00 kernel/locking/lockdep.c:3892 Code: 00 00 fc ff df 48 c1 ea 03 0f b6 14 02 84 d2 74 09 80 fa 03 0f 8e d3 19 00 00 41 0f b7 42 20 49 8d 7a 08 48 89 fa 48 c1 ea 03 <66> 25 00 e0 09 f0 66 41 89 42 20 48 b8 00 00 00 00 00 fc ff df 80 RSP: 0018:ffff8880ae909cb0 EFLAGS: 00000806 RAX: 0000000000004053 RBX: 0000000000000000 RCX: 0000000000000002 RDX: 1ffff1101531757d RSI: 0000000000000037 RDI: ffff8880a98babe8 RBP: ffff8880ae909dc8 R08: 0000000000000001 R09: 0000000000000001 R10: ffff8880a98babe0 R11: ffff8880a98ba340 R12: 0000000000000037 R13: 0000000000000000 R14: ffffffff88fbbc48 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200005c0 CR3: 0000000096863000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4485 seqcount_lockdep_reader_access include/linux/seqlock.h:81 [inline] read_seqcount_begin include/linux/seqlock.h:164 [inline] ktime_get kernel/time/timekeeping.c:757 [inline] ktime_get+0xd2/0x2f0 kernel/time/timekeeping.c:747 clockevents_program_event+0x15a/0x370 kernel/time/clockevents.c:326 tick_program_event+0xb4/0x130 kernel/time/tick-oneshot.c:44 hrtimer_interrupt+0x369/0x770 kernel/time/hrtimer.c:1654 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61 Code: 78 17 56 fa eb 8a cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d 84 68 4e 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 74 68 4e 00 fb f4 cc 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 2e 8e 07 fa e8 99 RSP: 0018:ffff8880a98cfd68 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff11e65ce RBX: ffff8880a98ba340 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffff8880a98babdc RBP: ffff8880a98cfd98 R08: ffff8880a98ba340 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 R13: ffffffff89c87ec0 R14: 0000000000000000 R15: 0000000000000001 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:685 default_idle_call+0x84/0xb0 kernel/sched/idle.c:94 cpuidle_idle_call kernel/sched/idle.c:154 [inline] do_idle+0x3b7/0x6d0 kernel/sched/idle.c:263 cpu_startup_entry+0x1b/0x20 kernel/sched/idle.c:355 start_secondary+0x2f4/0x410 arch/x86/kernel/smpboot.c:264 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242