audit: type=1400 audit(2000000985.680:5595): avc: denied { read } for pid=426 comm="syz-executor.4" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 INFO: task init:27199 blocked for more than 140 seconds. Not tainted 4.9.194+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. init D29304 27199 1 0x00000000 0000000000000087 ffff8801c7095f00 ffff8801a5876300 ffff8801db621000 ffff8801a4730000 ffff8801db621018 ffff8801acddf758 ffffffff8281af8e ffff8801c70967c8 ffff8801c70967a0 00ff8801c70967d0 ffff8801db6218f0 Call Trace: [<000000000e7abc51>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<0000000095c5216a>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<000000007a0ed0d4>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<000000007a0ed0d4>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<00000000d3047be9>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] [<00000000d3047be9>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 [<0000000026436646>] chrdev_open+0x230/0x630 fs/char_dev.c:398 [<00000000583357d4>] do_dentry_open+0x422/0xd20 fs/open.c:791 [<00000000049a4e3e>] vfs_open+0x105/0x230 fs/open.c:904 [<000000005457e88d>] do_last fs/namei.c:3541 [inline] [<000000005457e88d>] path_openat+0xbf5/0x2f60 fs/namei.c:3665 [<000000005b40cc85>] do_filp_open+0x1a1/0x280 fs/namei.c:3699 [<00000000a4f44c51>] do_sys_open+0x2f0/0x610 fs/open.c:1097 [<00000000f83905a7>] SYSC_open fs/open.c:1115 [inline] [<00000000f83905a7>] SyS_open+0x2d/0x40 fs/open.c:1110 [<00000000b3be3e3a>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<00000000035c220d>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Showing all locks held in the system: 2 locks held by khungtaskd/24: #0: (rcu_read_lock){......}, at: [<000000004b906dee>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<000000004b906dee>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.+..}, at: [<000000006a0b31a6>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336 1 lock held by rsyslogd/1902: #0: (&f->f_pos_lock){+.+.+.}, at: [<00000000768e094e>] __fdget_pos+0xa8/0xd0 fs/file.c:782 2 locks held by getty/2030: #0: (&tty->ldisc_sem){++++++}, at: [<00000000bb89dd11>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&ldata->atomic_read_lock){+.+.+.}, at: [<0000000058b3913d>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 1 lock held by init/27199: #0: (tty_mutex){+.+.+.}, at: [<00000000d3047be9>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<00000000d3047be9>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/27200: #0: (tty_mutex){+.+.+.}, at: [<00000000d3047be9>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<00000000d3047be9>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/27202: #0: (tty_mutex){+.+.+.}, at: [<00000000d3047be9>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<00000000d3047be9>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/27203: #0: (tty_mutex){+.+.+.}, at: [<00000000d3047be9>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<00000000d3047be9>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/27205: #0: (tty_mutex){+.+.+.}, at: [<00000000d3047be9>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<00000000d3047be9>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.194+ #0 ffff8801d98d7cc8 ffffffff81b67001 0000000000000000 0000000000000000 0000000000000000 ffffffff81099d01 dffffc0000000000 ffff8801d98d7d00 ffffffff81b7229c 0000000000000000 0000000000000000 0000000000000000 Call Trace: [<0000000008ecc367>] __dump_stack lib/dump_stack.c:15 [inline] [<0000000008ecc367>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<0000000091ee707f>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<00000000b3507504>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<00000000fdce9727>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<000000007c27b912>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<000000007c27b912>] check_hung_task kernel/hung_task.c:126 [inline] [<000000007c27b912>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<000000007c27b912>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<000000003e80713f>] kthread+0x278/0x310 kernel/kthread.c:211 [<000000002a87aa0f>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 27190 Comm: init Not tainted 4.9.194+ #0 task: 000000008920ed1e task.stack: 000000002734811e RIP: 0010:[] c [<0000000080fca7b4>] io_serial_in+0x6b/0x90 drivers/tty/serial/8250/8250_port.c:414 RSP: 0018:ffff8801c9287570 EFLAGS: 00000002 RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000 RDX: 00000000000003fd RSI: ffffffff81d86c81 RDI: ffffffff84b68e58 RBP: ffff8801c9287580 R08: 0000000000000001 R09: 0000000000003921 R10: ffff8801c70c0900 R11: 0000000000000001 R12: ffffffff84b68e20 R13: 0000000000000020 R14: fffffbfff096d20b R15: fffffbfff096d1cd FS: 00007f4a43f8a7a0(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000d2a228 CR3: 00000001aebbc000 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Stack: ffffffff84b68e20c 000000000000270bc ffff8801c92875d0c ffffffff81d88f24c ffff8801c9287608c ffffffff84b68e68c ffffffff84b6905ac ffffffff841d75ffc ffffffff84b68e20c 000000000000006ec dffffc0000000000c 000000000000006ec Call Trace: [<00000000e464ee55>] serial_in drivers/tty/serial/8250/8250.h:111 [inline] [<00000000e464ee55>] wait_for_xmitr+0x94/0x1e0 drivers/tty/serial/8250/8250_port.c:1997 [<00000000d543d44f>] serial8250_console_putchar+0x20/0x60 drivers/tty/serial/8250/8250_port.c:3103 [<00000000825ecabc>] uart_console_write+0x56/0xe0 drivers/tty/serial/serial_core.c:1885 [<00000000c49c4645>] serial8250_console_write+0x2fb/0x860 drivers/tty/serial/8250/8250_port.c:3169 [<00000000348ab420>] univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:594 [<000000005e48bc88>] call_console_drivers.isra.0.constprop.0+0x1ac/0x360 kernel/printk/printk.c:1594 [<000000003fb8a908>] console_unlock+0x47c/0xb20 kernel/printk/printk.c:2454 [<00000000198b8e27>] console_device+0x97/0xc0 kernel/printk/printk.c:2562 [<00000000b633d752>] tty_lookup_driver drivers/tty/tty_io.c:2018 [inline] [<00000000b633d752>] tty_open_by_driver drivers/tty/tty_io.c:2063 [inline] [<00000000b633d752>] tty_open+0x796/0xe10 drivers/tty/tty_io.c:2140 [<0000000026436646>] chrdev_open+0x230/0x630 fs/char_dev.c:398 [<00000000583357d4>] do_dentry_open+0x422/0xd20 fs/open.c:791 [<00000000049a4e3e>] vfs_open+0x105/0x230 fs/open.c:904 [<000000005457e88d>] do_last fs/namei.c:3541 [inline] [<000000005457e88d>] path_openat+0xbf5/0x2f60 fs/namei.c:3665 [<000000005b40cc85>] do_filp_open+0x1a1/0x280 fs/namei.c:3699 [<00000000a4f44c51>] do_sys_open+0x2f0/0x610 fs/open.c:1097 [<00000000f83905a7>] SYSC_open fs/open.c:1115 [inline] [<00000000f83905a7>] SyS_open+0x2d/0x40 fs/open.c:1110 [<00000000b3be3e3a>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<00000000035c220d>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Code: c24 cc9 c00 c00 c00 c49 c8d c7c c24 c38 c48 cb8 c00 c00 c00 c00 c00 cfc cff cdf c48 c89 cfa c48 cc1 cea c03 cd3 ce3 c80 c3c c02 c00 c75 c17 c41 c03 c5c c24 c38 c89 cda cec c<5b> c0f cb6 cc0 c41 c5c c5d cc3 ce8 c48 c7b c77 cff ceb cc2 ce8 ca1 c7b c77 cff ceb c