IPv6: Can't replace route, no match found
IPv6: Can't replace route, no match found
IPv6: Can't replace route, no match found
IPv6: Can't replace route, no match found
IPv6: Can't replace route, no match found
INFO: task init:2415 blocked for more than 140 seconds.
      Not tainted 4.4.172+ #13
IPv6: Can't replace route, no match found
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
init            D ffff8800b5937718 28112  2415      1 0x00000000
 ffff8800b5937718 ffff8800b3414740 d6b0431241a3c2c4 ffff8800b3414740
 0000000000000000 ffff8800b3415000 ffff8801db61f180 ffff8801db61f1a8
 ffff8801db61e898 ffff8800b3412f80 ffff8800b3414740 ffffed0016b26001
Call Trace:
 [<ffffffff827095f9>] schedule+0x99/0x1d0 kernel/sched/core.c:3355
 [<ffffffff82709db3>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3388
 [<ffffffff8270bf12>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff8270bf12>] mutex_lock_nested+0x3c2/0xb80 kernel/locking/mutex.c:621
 [<ffffffff81c8aeaa>] tty_open+0x56a/0xf50 drivers/tty/tty_io.c:2067
 [<ffffffff814a3b00>] chrdev_open+0x230/0x630 fs/char_dev.c:388
 [<ffffffff8149130f>] do_dentry_open+0x38f/0xbd0 fs/open.c:749
 [<ffffffff81494afb>] vfs_open+0x10b/0x210 fs/open.c:862
 [<ffffffff814c5a1f>] do_last fs/namei.c:3269 [inline]
 [<ffffffff814c5a1f>] path_openat+0x136f/0x4470 fs/namei.c:3406
 [<ffffffff814cc6f1>] do_filp_open+0x1a1/0x270 fs/namei.c:3440
 [<ffffffff81495428>] do_sys_open+0x2f8/0x600 fs/open.c:1038
 [<ffffffff8149575d>] SYSC_open fs/open.c:1056 [inline]
 [<ffffffff8149575d>] SyS_open+0x2d/0x40 fs/open.c:1051
 [<ffffffff82718621>] entry_SYSCALL_64_fastpath+0x1e/0x9a
1 lock held by init/2415:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81c8aeaa>] 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 4.4.172+ #13
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:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000080e2e28 CR3: 00000001d8ca4000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000001 ffffffff82e5f2e0 ffffffff831a67c0 fffffbfff0634bd4
 000000000001b6c0 0000000000000008 ffff8800001d7cd8 ffffffff81092bee
 0000000000000008 ffffffff82924260 ffff8800001d7d30 ffffffff81ab7e92
Call Trace:
 [<ffffffff81092bee>] nmi_raise_cpu_backtrace+0x5e/0x80 arch/x86/kernel/apic/hw_nmi.c:33
 [<ffffffff81ab7e92>] 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
 [<ffffffff813b4556>] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline]
 [<ffffffff813b4556>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff813b4556>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff813b4556>] watchdog.cold+0xd3/0xee kernel/hung_task.c:238
 [<ffffffff811340b3>] kthread+0x273/0x310 kernel/kthread.c:211
 [<ffffffff82718a45>] 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 e1 
NMI backtrace for cpu 1
CPU: 1 PID: 2242 Comm: sshd Not tainted 4.4.172+ #13
task: ffff8800b4982f80 task.stack: ffff8800b4a38000
RIP: 0010:[<ffffffff8149e59a>]  [<ffffffff8149e59a>] rcu_sync_is_idle include/linux/rcu_sync.h:56 [inline]
RIP: 0010:[<ffffffff8149e59a>]  [<ffffffff8149e59a>] percpu_down_read_trylock include/linux/percpu-rwsem.h:56 [inline]
RIP: 0010:[<ffffffff8149e59a>]  [<ffffffff8149e59a>] __sb_start_write+0xda/0x310 fs/super.c:1223
RSP: 0018:ffff8800b4a3fb88  EFLAGS: 00000202
RAX: 0000000000024eb0 RBX: ffff8800bb8a58b8 RCX: 0000000000000000
RDX: 1ffff10017714b25 RSI: ffffffff81b0a7fc RDI: ffff8800bb8a58b8
RBP: ffff8800b4a3fbb8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000148
R13: ffff8800bb8a5500 R14: ffff8800bb8a58b8 R15: 0000000000000000
FS:  00007f29e906e7c0(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000080c7657 CR3: 00000000b4a76000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff814ee4e9 1ffff10016947f79 ffff8800b8262398 ffff8800b8262370
 ffff8801da71a620 dffffc0000000000 ffff8800b4a3fc50 ffffffff814ee765
 0000000041b58ab3 ffffffff82c67bbd ffffffff814ee620 ffff8801d16d0300
Call Trace:
 [<ffffffff814ee765>] sb_start_write_trylock include/linux/fs.h:1522 [inline]
 [<ffffffff814ee765>] touch_atime+0x145/0x2a0 fs/inode.c:1643
 [<ffffffff814b1861>] file_accessed include/linux/fs.h:2000 [inline]
 [<ffffffff814b1861>] pipe_read+0x6f1/0x860 fs/pipe.c:334
 [<ffffffff814963c5>] new_sync_read fs/read_write.c:422 [inline]
 [<ffffffff814963c5>] __vfs_read+0x2e5/0x3c0 fs/read_write.c:434
 [<ffffffff81497f04>] vfs_read+0x134/0x360 fs/read_write.c:454
 [<ffffffff8149a72c>] SYSC_read fs/read_write.c:569 [inline]
 [<ffffffff8149a72c>] SyS_read+0xdc/0x1c0 fs/read_write.c:562
 [<ffffffff82718621>] entry_SYSCALL_64_fastpath+0x1e/0x9a
Code: 66 00 48 8d 7b 70 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 1d 02 00 00 48 89 df 48 8b 43 70 65 ff 00 <e8> 21 c8 d9 ff 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea