SELinux: unrecognized netlink message: protocol=0 nlmsg_type=12297 sclass=netlink_route_socket SELinux: unrecognized netlink message: protocol=0 nlmsg_type=12297 sclass=netlink_route_socket SELinux: unrecognized netlink message: protocol=0 nlmsg_type=12297 sclass=netlink_route_socket SELinux: unrecognized netlink message: protocol=0 nlmsg_type=12297 sclass=netlink_route_socket SELinux: unrecognized netlink message: protocol=0 nlmsg_type=12297 sclass=netlink_route_socket INFO: task init:12755 blocked for more than 140 seconds. Not tainted 4.4.174+ #4 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. init D ffff8801d158f718 29280 12755 1 0x00000000 ffff8801d158f718 ffff8801d1eb8000 57d60e7945ff9f0a ffff8801d1eb8000 0000000000000000 ffff8801d1eb8800 ffff8801db61f180 ffff8801db61f1a8 ffff8801db61e898 ffff8800b4844740 ffff8801d1eb8000 ffffed003a2b1001 Call Trace: [] schedule+0x99/0x1d0 kernel/sched/core.c:3355 [] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3388 [] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [] mutex_lock_nested+0x3c2/0xb80 kernel/locking/mutex.c:621 [] tty_open+0x56a/0xf50 drivers/tty/tty_io.c:2067 [] chrdev_open+0x230/0x630 fs/char_dev.c:388 [] do_dentry_open+0x38f/0xbd0 fs/open.c:749 [] vfs_open+0x10b/0x210 fs/open.c:862 [] do_last fs/namei.c:3269 [inline] [] path_openat+0x136f/0x4470 fs/namei.c:3406 [] do_filp_open+0x1a1/0x270 fs/namei.c:3440 [] do_sys_open+0x2f8/0x600 fs/open.c:1038 [] SYSC_open fs/open.c:1056 [inline] [] SyS_open+0x2d/0x40 fs/open.c:1051 [] entry_SYSCALL_64_fastpath+0x1e/0x9a 1 lock held by init/12755: #0: (tty_mutex){+.+.+.}, at: [] tty_open+0x56a/0xf50 drivers/tty/tty_io.c:2067 Sending NMI to all CPUs: NMI backtrace for cpu 0 CPU: 0 PID: 20 Comm: khungtaskd Not tainted 4.4.174+ #4 task: ffff8801da6c4740 task.stack: ffff8800001c0000 RIP: 0010:[] [] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:62 [inline] RIP: 0010:[] [] flat_send_IPI_mask+0xf7/0x1b0 arch/x86/kernel/apic/apic_flat_64.c:69 RSP: 0018:ffff8800001c7c88 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000c00 RCX: 0000000000000000 RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fc300 RBP: ffff8800001c7cb8 R08: 0000000000000018 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000246 R13: 0000000003000000 R14: ffffffff82e5f2e0 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000180 CR3: 00000000b7463000 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: 0000000000000001 ffffffff82e5f2e0 ffffffff831a6ac0 fffffbfff0634c34 000000000001b6c0 0000000000000008 ffff8800001c7cd8 ffffffff81092bee 0000000000000008 ffffffff82924260 ffff8800001c7d30 ffffffff81ab8252 Call Trace: [] nmi_raise_cpu_backtrace+0x5e/0x80 arch/x86/kernel/apic/hw_nmi.c:33 [] nmi_trigger_all_cpu_backtrace.cold+0xa1/0xae lib/nmi_backtrace.c:85 [] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 [] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline] [] check_hung_task kernel/hung_task.c:125 [inline] [] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline] [] watchdog.cold+0xd3/0xee kernel/hung_task.c:238 [] kthread+0x273/0x310 kernel/kthread.c:211 [] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:537 Code: 00 c3 5f ff 80 e6 10 75 e1 41 c1 e5 18 44 89 2c 25 10 c3 5f ff 44 89 fa 09 da 80 cf 04 41 83 ff 02 0f 44 d3 89 14 25 00 c3 5f ff <41> f7 c4 00 02 00 00 75 1e 4c 89 e7 57 9d 0f 1f 44 00 00 e8 f1 NMI backtrace for cpu 1 CPU: 1 PID: 2254 Comm: syz-executor117 Not tainted 4.4.174+ #4 task: ffff8801d233c740 task.stack: ffff8800b45a0000 RIP: 0010:[] [] io_serial_in+0x6b/0x90 drivers/tty/serial/8250/8250_port.c:399 RSP: 0018:ffff8800b45a7068 EFLAGS: 00000002 RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000 RDX: 00000000000003fd RSI: ffffffff81cc24d1 RDI: ffffffff8496e518 RBP: ffff8800b45a7078 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: ffffffff83fdf1cc R12: ffffffff8496e4e0 R13: 0000000000000020 R14: fffffbfff092dce3 R15: fffffbfff092dca5 FS: 00007fc0bedb9700(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc0bedb8e78 CR3: 00000001d1f25000 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffffffff8496e4e0 000000000000270c ffff8800b45a70c8 ffffffff81cc461f ffffed00168b4e2f ffffffff8496e528 ffffffff8496e71a ffffffff83fdf15f ffffffff8496e4e0 000000000000002a dffffc0000000000 000000000000002a Call Trace: [] serial_in drivers/tty/serial/8250/8250.h:97 [inline] [] wait_for_xmitr+0x8f/0x1e0 drivers/tty/serial/8250/8250_port.c:1717 [] serial8250_console_putchar+0x20/0x60 drivers/tty/serial/8250/8250_port.c:2806 [] uart_console_write+0x56/0xe0 drivers/tty/serial/serial_core.c:1789 [] serial8250_console_write+0x2fb/0x870 drivers/tty/serial/8250/8250_port.c:2872 [] univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:594 [] call_console_drivers.constprop.0+0x1ef/0x3f0 kernel/printk/printk.c:1468 [] console_unlock kernel/printk/printk.c:2335 [inline] [] console_unlock+0x602/0xa10 kernel/printk/printk.c:2242 [] vprintk_emit+0x3b2/0x820 kernel/printk/printk.c:1837 [] vprintk+0x28/0x30 kernel/printk/printk.c:1848 [] printk+0xc2/0xf5 kernel/printk/printk.c:1927 [] selinux_nlmsg_perm security/selinux/hooks.c:4820 [inline] [] selinux_netlink_send.cold+0xef/0x134 security/selinux/hooks.c:5154 [] security_netlink_send+0x7b/0xb0 security/security.c:1143 [] netlink_sendmsg+0x658/0xc80 net/netlink/af_netlink.c:1849 [] sock_sendmsg_nosec net/socket.c:638 [inline] [] sock_sendmsg+0xbe/0x110 net/socket.c:648 [] kernel_sendmsg+0x44/0x50 net/socket.c:656 [] sock_no_sendpage+0x116/0x150 net/core/sock.c:2283 [] kernel_sendpage+0x95/0xf0 net/socket.c:3320 [] sock_sendpage+0x8b/0xc0 net/socket.c:793 [] pipe_to_sendpage+0x28d/0x3d0 fs/splice.c:724 [] splice_from_pipe_feed fs/splice.c:776 [inline] [] __splice_from_pipe+0x37e/0x7a0 fs/splice.c:901 [] splice_from_pipe+0x108/0x170 fs/splice.c:936 [] generic_splice_sendpage+0x3c/0x50 fs/splice.c:1109 [] do_splice_from fs/splice.c:1128 [inline] [] direct_splice_actor+0x126/0x1a0 fs/splice.c:1294 [] splice_direct_to_actor+0x2ce/0x850 fs/splice.c:1247 [] do_splice_direct+0x1a5/0x260 fs/splice.c:1337 [] do_sendfile+0x4ed/0xba0 fs/read_write.c:1229