INFO: task syz-executor.0:23833 can't die for more than 143 seconds. syz-executor.0 R running task 24232 23833 8732 0x00004006 Call Trace: Showing all locks held in the system: 1 lock held by khungtaskd/1055: #0: 00000000ebd89246 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5257 1 lock held by rsyslogd/8895: #0: 00000000aca18ada (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/8985: #0: 00000000a14913f8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000a1aac727 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8986: #0: 000000005185cb9e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000e111eedb (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8987: #0: 0000000011cb8288 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000431225f0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8988: #0: 00000000c54dca94 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000005ef89e5a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8989: #0: 00000000a2830304 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000610b918e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8990: #0: 0000000067d7d3ce (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000126d8721 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8991: #0: 000000008b289b85 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000001e676259 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.0/23833: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1055 Comm: khungtaskd Not tainted 5.2.0-next-20190718 #41 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:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4897 Comm: kworker/u4:1 Not tainted 5.2.0-next-20190718 #41 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_purge_orig RIP: 0010:irqtime_account_irq+0x83/0x290 kernel/sched/cputime.c:60 Code: c5 00 11 9c 88 e8 dd 97 ed 01 89 c7 e8 a6 f8 ff ff 48 ba 00 00 00 00 00 fc ff df 48 8d 7b 10 48 89 f9 48 c1 e9 03 80 3c 11 00 <0f> 85 90 01 00 00 49 89 c5 4c 2b 6b 10 48 89 43 10 65 8b 05 3d 5b RSP: 0018:ffff8880ae809f78 EFLAGS: 00000046 RAX: 000001e0a877e519 RBX: ffff8880ae8205b0 RCX: 1ffff11015d040b8 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff8880ae8205c0 RBP: ffff8880ae809f98 R08: ffffffff89e3d01c R09: ffffffff89e3d008 R10: ffffffff89e3d010 R11: 0000000000000001 R12: ffff88808ae28580 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000625208 CR3: 0000000097bc8000 CR4: 00000000001426f0 Call Trace: account_irq_enter_time include/linux/vtime.h:108 [inline] irq_enter+0x66/0xe0 kernel/softirq.c:358 entering_irq arch/x86/include/asm/apic.h:518 [inline] entering_ack_irq arch/x86/include/asm/apic.h:524 [inline] smp_apic_timer_interrupt+0x3f/0x610 arch/x86/kernel/apic/apic.c:1091 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:828 RIP: 0010:should_resched arch/x86/include/asm/preempt.h:102 [inline] RIP: 0010:__local_bh_enable_ip+0x18e/0x270 kernel/softirq.c:196 Code: 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 df 00 00 00 48 83 3d ff 66 8d 07 00 0f 84 8f 00 00 00 fb 66 0f 1f 44 00 00 <65> 8b 05 53 73 bc 7e 85 c0 74 7f 5b 41 5c 41 5d 5d c3 80 3d 93 c1 RSP: 0018:ffff88808d9dfc48 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff11a5e24 RBX: 0000000000000201 RCX: 0000000000000006 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff88808ae28e14 RBP: ffff88808d9dfc60 R08: 1ffffffff14a7d5a R09: fffffbfff14a7d5b R10: fffffbfff14a7d5a R11: ffffffff8a53ead7 R12: ffffffff871e88e5 R13: ffff88808ae28580 R14: dffffc0000000000 R15: 0000000000000017 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:176 [inline] _raw_spin_unlock_bh+0x31/0x40 kernel/locking/spinlock.c:207 spin_unlock_bh include/linux/spinlock.h:383 [inline] batadv_purge_orig_ref+0xa85/0x1060 net/batman-adv/originator.c:1366 batadv_purge_orig+0x1b/0x70 net/batman-adv/originator.c:1379 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352