INFO: task syz-executor2:16382 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-executor2 D29728 16382 1848 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] tcp_sendmsg+0x1c/0x40 net/ipv4/tcp.c:1445 inet_sendmsg+0x168/0x540 net/ipv4/af_inet.c:781 sock_sendmsg_nosec net/socket.c:645 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:655 sock_write_iter+0x209/0x350 net/socket.c:924 call_write_iter include/linux/fs.h:1782 [inline] new_sync_write fs/read_write.c:471 [inline] __vfs_write+0x417/0x5c0 fs/read_write.c:484 vfs_write+0x17f/0x4d0 fs/read_write.c:546 SYSC_write fs/read_write.c:593 [inline] SyS_write+0xc2/0x1a0 fs/read_write.c:585 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4572d9 RSP: 002b:00007f46ab1ebc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f46ab1ec6d4 RCX: 00000000004572d9 RDX: 0000000000000000 RSI: 0000000020000440 RDI: 0000000000000005 RBP: 00000000009301e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d7d10 R14: 00000000004caab8 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/1758: #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 1 CPU: 1 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4804 Comm: syz-executor5 Not tainted 4.14.69+ #5 task: ffff88012473de00 task.stack: ffff880123c80000 RIP: 0010:__secure_computing+0x6/0x310 kernel/seccomp.c:782 RSP: 0018:ffff880123c87de8 EFLAGS: 00000297 RAX: ffff88012473de00 RBX: ffff880123c87f58 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff880123c87e50 RBP: 1ffff10024790fc6 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 00000000c000003e R13: 0000000000000000 R14: ffff880123c87fd0 R15: 0000000000000080 FS: 00007fdc27180700(0000) GS:ffff8801dba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c4a0f57010 CR3: 00000001d6ae2004 CR4: 00000000001606b0 Call Trace: syscall_trace_enter+0x506/0xc10 arch/x86/entry/common.c:120 do_syscall_64+0x331/0x4b0 arch/x86/entry/common.c:280 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4572d9 RSP: 002b:00007fdc2717fcf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00000000009300a8 RCX: 00000000004572d9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000009300a8 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000009300ac R13: 00007ffc7359aaaf R14: 00007fdc271809c0 R15: 0000000000000000 Code: 9c f1 ff ff e8 2c fc 20 00 e9 36 f2 ff ff e8 32 fc 20 00 e9 5c ec ff ff e8 28 fc 20 00 e9 a7 f1 ff ff 0f 1f 00 41 55 41 54 55 53 <48> 89 fb 65 48 8b 2c 25 c0 de 01 00 e8 29 00 ff ff 48 8d bd 20