keychord: invalid keycode count 0
keychord: invalid keycode count 0
keychord: invalid keycode count 0
keychord: invalid keycode count 0
keychord: invalid keycode count 0
INFO: task init:8740 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 ffff8801d41c7718 28936  8740      1 0x00000000
 ffff8801d41c7718 ffff8801c9310000 7c652d7ec532d3c7 ffff8801c9310000
 0000000000000000 ffff8801c9310800 ffff8801db61f180 ffff8801db61f1a8
 ffff8801db61e898 ffff8800b51fc740 ffff8801c9310000 ffffed003a838001
Call Trace:
 [<ffffffff82709b79>] schedule+0x99/0x1d0 kernel/sched/core.c:3355
 [<ffffffff8270a333>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3388
 [<ffffffff8270c492>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff8270c492>] mutex_lock_nested+0x3c2/0xb80 kernel/locking/mutex.c:621
 [<ffffffff81c8b2aa>] tty_open+0x56a/0xf50 drivers/tty/tty_io.c:2067
 [<ffffffff814a3ec0>] chrdev_open+0x230/0x630 fs/char_dev.c:388
 [<ffffffff8149154f>] do_dentry_open+0x38f/0xbd0 fs/open.c:749
 [<ffffffff81494d3b>] vfs_open+0x10b/0x210 fs/open.c:862
 [<ffffffff814c5ddf>] do_last fs/namei.c:3269 [inline]
 [<ffffffff814c5ddf>] path_openat+0x136f/0x4470 fs/namei.c:3406
 [<ffffffff814ccab1>] do_filp_open+0x1a1/0x270 fs/namei.c:3440
 [<ffffffff81495668>] do_sys_open+0x2f8/0x600 fs/open.c:1038
 [<ffffffff8149599d>] SYSC_open fs/open.c:1056 [inline]
 [<ffffffff8149599d>] SyS_open+0x2d/0x40 fs/open.c:1051
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
1 lock held by init/8740:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81c8b2aa>] tty_open+0x56a/0xf50 drivers/tty/tty_io.c:2067
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 1419 Comm: syz-executor.3 Not tainted 4.4.174+ #4
task: ffff8800b0805f00 task.stack: ffff8801d9dc8000
RIP: 0010:[<ffffffff813095f4>]  [<ffffffff813095f4>] __sanitizer_cov_trace_pc+0x4/0x50 kernel/kcov.c:96
RSP: 0018:ffff8801d9dcfb60  EFLAGS: 00000202
RAX: 0000000000000293 RBX: 0000000000000008 RCX: 0000000000000008
RDX: 0000000000000000 RSI: ffffffff81541ee1 RDI: ffff8800bb626780
RBP: ffff8801d9dcfb60 R08: 0000000000000422 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d82af040
R13: ffff8800bb626780 R14: 0000000000000453 R15: 0000000000001000
FS:  0000000001cdf940(0063) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000046d830 CR3: 00000001cc957000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801d9dcfbb0 ffffffff81541ef6 00001000d9dcfbb0 0000000000000453
 ffff8800bb626780 0000000000000008 ffff8801d82af040 ffff8800bb626780
 0000000000000453 0000000000001000 ffff8801d9dcfbe8 ffffffff8154358b
Call Trace:
 [<ffffffff81541ef6>] arch_local_irq_disable arch/x86/include/asm/paravirt.h:817 [inline]
 [<ffffffff81541ef6>] lookup_bh_lru fs/buffer.c:1336 [inline]
 [<ffffffff81541ef6>] __find_get_block+0x36/0x550 fs/buffer.c:1367
 [<ffffffff8154358b>] __getblk_gfp+0x2b/0x80 fs/buffer.c:1393
 [<ffffffff8163ad45>] sb_getblk include/linux/buffer_head.h:313 [inline]
 [<ffffffff8163ad45>] recently_deleted fs/ext4/ialloc.c:687 [inline]
 [<ffffffff8163ad45>] __ext4_new_inode+0x1375/0x47e0 fs/ext4/ialloc.c:859
 [<ffffffff81682718>] ext4_symlink+0x248/0x9a0 fs/ext4/namei.c:3126
 [<ffffffff814c994f>] vfs_symlink2 fs/namei.c:4040 [inline]
 [<ffffffff814c994f>] vfs_symlink2+0x1ef/0x3c0 fs/namei.c:4026
 [<ffffffff814cd78e>] SYSC_symlinkat fs/namei.c:4073 [inline]
 [<ffffffff814cd78e>] SyS_symlinkat+0x14e/0x240 fs/namei.c:4053
 [<ffffffff814cd8a3>] SYSC_symlink fs/namei.c:4086 [inline]
 [<ffffffff814cd8a3>] SyS_symlink+0x23/0x30 fs/namei.c:4084
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
Code: 17 00 48 8b 55 c8 e9 d2 fe ff ff 48 89 df e8 e4 b8 17 00 e9 ac fe ff ff 4c 89 f7 e8 d7 b8 17 00 e9 42 fe ff ff 66 90 55 48 89 e5 <48> 8b 75 08 65 48 8b 04 25 80 67 01 00 65 8b 15 08 d1 d0 7e 81 
NMI backtrace for cpu 1
CPU: 1 PID: 20 Comm: khungtaskd Not tainted 4.4.174+ #4
task: ffff8801da6f4740 task.stack: ffff8800001d0000
RIP: 0010:[<ffffffff8109b617>]  [<ffffffff8109b617>] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:62 [inline]
RIP: 0010:[<ffffffff8109b617>]  [<ffffffff8109b617>] flat_send_IPI_mask+0xf7/0x1b0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8800001d7c88  EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fc300
RBP: ffff8800001d7cb8 R08: 0000000000000018 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000246
R13: 0000000003000000 R14: ffffffff82e5f2e0 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001fda678 CR3: 00000001d86b3000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000001 ffffffff82e5f2e0 ffffffff831a6ac0 fffffbfff0634c34
 000000000001b6c0 0000000000000008 ffff8800001d7cd8 ffffffff81092bee
 0000000000000008 ffffffff82924260 ffff8800001d7d30 ffffffff81ab8252
Call Trace:
 [<ffffffff81092bee>] nmi_raise_cpu_backtrace+0x5e/0x80 arch/x86/kernel/apic/hw_nmi.c:33
 [<ffffffff81ab8252>] nmi_trigger_all_cpu_backtrace.cold+0xa1/0xae lib/nmi_backtrace.c:85
 [<ffffffff81092ca4>] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 [<ffffffff813b4762>] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline]
 [<ffffffff813b4762>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff813b4762>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff813b4762>] watchdog.cold+0xd3/0xee kernel/hung_task.c:238
 [<ffffffff811342c3>] kthread+0x273/0x310 kernel/kthread.c:211
 [<ffffffff82718fc5>] 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