INFO: task syz-executor.1:29580 can't die for more than 143 seconds. syz-executor.1 R running task 26312 29580 9216 0x00004006 Call Trace: Showing all locks held in the system: 1 lock held by khungtaskd/1046: #0: 00000000f5711c61 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5262 1 lock held by rsyslogd/9086: #0: 000000003e3cb0ab (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/9176: #0: 000000008af88548 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000e93f2300 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9177: #0: 00000000ab9404d8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000062ae2d9f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9178: #0: 00000000197e9184 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000614739c0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9179: #0: 00000000ef0a9ddd (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000089bdf528 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9180: #0: 00000000ebea384b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000c20bf46d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9181: #0: 00000000418eca67 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000d89046c4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9182: #0: 00000000b666ce26 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000005672dbec (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.1/29580: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1046 Comm: khungtaskd Not tainted 5.2.0-rc6-next-20190625 #22 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+0x172/0x1f0 lib/dump_stack.c:113 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:249 [inline] watchdog+0xc54/0x1320 kernel/hung_task.c:333 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:353 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 29580 Comm: syz-executor.1 Not tainted 5.2.0-rc6-next-20190625 #22 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:match_held_lock+0x12/0x510 kernel/locking/lockdep.c:3943 Code: d2 88 89 45 84 e8 5e 1a 54 00 8b 45 84 e9 67 ff ff ff 66 0f 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 57 41 56 <41> 55 41 54 53 48 89 fb 48 83 c7 10 48 89 fa 48 83 ec 08 48 c1 ea RSP: 0018:ffff8880ae809d88 EFLAGS: 00000002 RAX: dffffc0000000000 RBX: ffff8880a74ce400 RCX: ffff8880a74cec90 RDX: 1ffff11014e99d91 RSI: ffffffff88da7f80 RDI: ffff8880a74cec90 RBP: ffff8880ae809d98 R08: ffff8880a74ce400 R09: ffffed1015d06c7c R10: ffffed1015d06c7b R11: ffff8880ae8363db R12: ffffed1014e99d91 R13: ffff8880a74cec90 R14: ffffffff88da7f80 R15: 0000000000000000 FS: 00007f4f4b8de700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000000a8c98000 CR4: 00000000001506f0 Call Trace: __lock_is_held kernel/locking/lockdep.c:4238 [inline] lock_is_held_type+0x1b8/0x320 kernel/locking/lockdep.c:4456 lock_is_held include/linux/lockdep.h:365 [inline] rcu_read_lock_sched_held+0x110/0x130 kernel/rcu/update.c:105 trace_hrtimer_expire_exit include/trace/events/timer.h:279 [inline] __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0xc71/0xe40 kernel/time/hrtimer.c:1450 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1508 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline] smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1066 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:767 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x95/0xe0 kernel/locking/spinlock.c:191 Code: 48 c7 c0 70 bd d2 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 39 48 83 3d 72 60 a3 01 00 74 24 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 2c 44 1f fa 65 8b 05 6d a0 d2 78 RSP: 0018:ffff88804622f7f0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff11a57ae RBX: 0000000000000282 RCX: 0000000000000006 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000282 RBP: ffff88804622f800 R08: 1ffffffff14a0561 R09: fffffbfff14a0562 R10: fffffbfff14a0561 R11: ffffffff8a502b0f R12: ffff8880874973b0 R13: 0000000000000000 R14: ffff888055df378c R15: ffff8880874974c0 spin_unlock_irqrestore include/linux/spinlock.h:393 [inline] queue_access_unlock sound/core/seq/seq_queue.c:368 [inline] snd_seq_control_queue+0x22b/0x9b0 sound/core/seq/seq_queue.c:726 event_input_timer+0x26/0x30 sound/core/seq/seq_system.c:103 snd_seq_deliver_single_event.constprop.0+0x459/0x890 sound/core/seq/seq_clientmgr.c:638 snd_seq_deliver_event+0x57f/0x8e0 sound/core/seq/seq_clientmgr.c:839 snd_seq_dispatch_event+0x131/0x5c0 sound/core/seq/seq_clientmgr.c:913 snd_seq_check_queue.part.0+0x139/0x360 sound/core/seq/seq_queue.c:262 snd_seq_check_queue sound/core/seq/seq_queue.c:242 [inline] snd_seq_enqueue_event+0x1fb/0x4d0 sound/core/seq/seq_queue.c:330 snd_seq_client_enqueue_event.constprop.0+0x259/0x470 sound/core/seq/seq_clientmgr.c:974 snd_seq_write+0x3c7/0x6e0 sound/core/seq/seq_clientmgr.c:1091 __vfs_write+0x8a/0x110 fs/read_write.c:494 vfs_write+0x268/0x5d0 fs/read_write.c:558 ksys_write+0x220/0x290 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:620 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459519 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4f4b8ddc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459519 RDX: 00000000ffffff76 RSI: 0000000020000000 RDI: 0000000000000005 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4f4b8de6d4 R13: 00000000004c953a R14: 00000000004e0850 R15: 00000000ffffffff