INFO: task syz-executor1:22618 blocked for more than 140 seconds. Not tainted 4.14.69+ #5 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor1 D29576 22618 10776 0x00000004 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 __lock_sock+0x11d/0x210 net/core/sock.c:2237 lock_sock_nested+0xe3/0x100 net/core/sock.c:2758 lock_sock include/net/sock.h:1452 [inline] do_ip_getsockopt+0x155/0x1500 net/ipv4/ip_sockglue.c:1328 ip_getsockopt+0x82/0x160 net/ipv4/ip_sockglue.c:1559 udp_getsockopt+0x45/0x90 net/ipv4/udp.c:2489 ipv6_getsockopt+0x1bd/0x210 net/ipv6/ipv6_sockglue.c:1355 tcp_getsockopt+0x80/0xc0 net/ipv4/tcp.c:3240 SYSC_getsockopt net/socket.c:1895 [inline] SyS_getsockopt+0x126/0x200 net/socket.c:1877 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4572a9 RSP: 002b:00007f9fa7977c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 00007f9fa79786d4 RCX: 00000000004572a9 RDX: 0000000000000482 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000930140 R08: 0000000020000100 R09: 0000000000000000 R10: 0000000020000180 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004ccb60 R14: 00000000004bd8c0 R15: 0000000000000001 INFO: task syz-executor1:22625 blocked for more than 140 seconds. Not tainted 4.14.69+ #5 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor1 D29368 22625 10776 0x00000004 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 __lock_sock+0x11d/0x210 net/core/sock.c:2237 lock_sock_nested+0xe3/0x100 net/core/sock.c:2758 lock_sock include/net/sock.h:1452 [inline] do_tcp_setsockopt.isra.9+0x112/0x1b70 net/ipv4/tcp.c:2542 tcp_setsockopt+0xaa/0xc0 net/ipv4/tcp.c:2813 SYSC_setsockopt net/socket.c:1864 [inline] SyS_setsockopt+0x132/0x220 net/socket.c:1843 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4572a9 RSP: 002b:00007f9fa7956c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f9fa79576d4 RCX: 00000000004572a9 RDX: 0000000000000016 RSI: 0000000000000006 RDI: 0000000000000003 RBP: 00000000009301e0 R08: 0000000020000440 R09: 0000000000000000 R10: 0000000020000440 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d5938 R14: 00000000004c0750 R15: 0000000000000002 Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x74/0x20f kernel/locking/lockdep.c:4541 2 locks held by getty/1756: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x20/0x80 drivers/tty/tty_ldisc.c:275 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1ff/0x15e0 drivers/tty/n_tty.c:2142 2 locks held by syz-executor5/21908: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x20/0x80 drivers/tty/tty_ldisc.c:275 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1ff/0x15e0 drivers/tty/n_tty.c:2142 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.69+ #5 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x11b lib/dump_stack.c:53 nmi_cpu_backtrace.cold.0+0x47/0x85 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x121/0x146 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline] watchdog+0x574/0xa70 kernel/hung_task.c:252 kthread+0x348/0x420 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4171 Comm: syz-executor3 Not tainted 4.14.69+ #5 task: ffff88019755c680 task.stack: ffff88019a000000 RIP: 0010:__trace_hardirqs_on_caller kernel/locking/lockdep.c:2878 [inline] RIP: 0010:trace_hardirqs_on_caller+0x29f/0x520 kernel/locking/lockdep.c:2926 RSP: 0018:ffff88019a007ee8 EFLAGS: 00000002 RAX: 0000000000000001 RBX: ffff88019755c680 RCX: 0000000000000000 RDX: 1ffff10032eab9d5 RSI: 0000000000000001 RDI: ffff88019755c680 RBP: ffffffffafe00096 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f7ab85d6700(0000) GS:ffff8801dbb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020316000 CR3: 00000001c657c006 CR4: 00000000001606a0 Call Trace: trace_hardirqs_on_thunk+0x1a/0x1c entry_SYSCALL_64_after_hwframe+0x52/0xb7 RIP: 0033:0x4572a9 RSP: 002b:00007f7ab85d5cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffff001 RBX: 0000000000930148 RCX: 00000000004572a9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 0000000000930148 RBP: 0000000000930140 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000093014c R13: 00007ffd0d2f9c1f R14: 00007f7ab85d69c0 R15: 0000000000000001 Code: 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 8c 01 00 00 8b 83 18 08 00 00 85 c0 0f 85 d5 00 00 00 <48> 8d bb e0 07 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48