INFO: task syz-executor.3:24187 can't die for more than 143 seconds. syz-executor.3 R running task 28584 24187 9045 0x00000004 Call Trace: context_switch /kernel/sched/core.c:3254 [inline] __schedule+0x755/0x1580 /kernel/sched/core.c:3880 preempt_schedule_irq+0xb5/0x160 /kernel/sched/core.c:4128 retint_kernel+0x1b/0x2b RIP: 0010:exit_to_usermode_loop+0x73/0x380 /arch/x86/entry/common.c:148 Code: 88 48 c1 e8 03 42 80 3c 20 00 0f 85 e0 02 00 00 48 83 3d 5f 69 d2 07 00 0f 84 36 02 00 00 e8 24 fd 71 00 fb 66 0f 1f 44 00 00 <41> 89 dd 31 ff 41 83 e5 08 44 89 ee e8 8c fe 71 00 45 85 ed 0f 85 RSP: 0000:ffff888058affee8 EFLAGS: 00000216 ORIG_RAX: ffffffffffffff13 RAX: 0000000000040000 RBX: 0000000000000008 RCX: ffffc9000c7a1000 RDX: 00000000000004c7 RSI: ffffffff810087cc RDI: ffff88805c5cab94 RBP: ffff888058afff18 R08: ffff88805c5ca300 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 R13: 1ffff1100b8b9460 R14: ffff888058afff58 R15: ffff88805c5ca300 prepare_exit_to_usermode+0x2ff/0x370 /arch/x86/entry/common.c:194 retint_user+0x8/0x18 RIP: 0033:0x45c65a Code: 48 8d 7e ff 48 01 cf 4c 29 d7 49 89 3b c3 cc cc 48 8b 74 24 08 48 8b 5c 24 10 8a 44 24 20 4c 8d 44 24 28 e9 28 00 00 00 cc cc cc cc cc cc cc 48 8b 74 24 08 48 8b 5c 24 10 8a 44 24 18 4c 8d RSP: 002b:00007ff2bade8c58 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000045c65a RDX: 00000000000002b3 RSI: 00007ff2bade8c60 RDI: 0000000000000001 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00000000004c6d52 R14: 00000000004dc010 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1054: #0: 00000000ba1091b5 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e /kernel/locking/lockdep.c:5257 1 lock held by rsyslogd/8907: #0: 000000002f461759 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 /fs/file.c:801 2 locks held by getty/8997: #0: 000000006a69c33c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 00000000280901c5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/8998: #0: 00000000fa84ab6b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 000000004eb7e604 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/8999: #0: 00000000cf213645 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 00000000aba0ff29 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/9000: #0: 000000008924fa11 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 00000000a3054ce7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/9001: #0: 0000000046e4c862 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 0000000005dbfd4b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/9002: #0: 0000000067212724 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 000000005e73f413 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/9003: #0: 00000000aa52fd7f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 0000000068964ad3 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1054 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 skipped: idling at native_safe_halt+0xe/0x10 /./arch/x86/include/asm/irqflags.h:60