IPv6: NLM_F_REPLACE set, but no existing node found!
NMI watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [kworker/u4:2:40]
Modules linked in:
irq event stamp: 0
hardirqs last  enabled at (0): [<          (null)>]           (null)
hardirqs last disabled at (0): [<ffffffff8112b058>] copy_process.part.51+0x1168/0x5d40 kernel/fork.c:1608
softirqs last  enabled at (0): [<ffffffff8112b0ff>] copy_process.part.51+0x120f/0x5d40 kernel/fork.c:1611
softirqs last disabled at (0): [<          (null)>]           (null)
CPU: 1 PID: 40 Comm: kworker/u4:2 Not tainted 4.9.54-g9add7c4 #63
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfn (flush-8:0)
task: ffff8801d98a0000 task.stack: ffff8801d9920000
RIP: 0010:[<ffffffff812e65b0>]  [<ffffffff812e65b0>] rep_nop arch/x86/include/asm/processor.h:584 [inline]
RIP: 0010:[<ffffffff812e65b0>]  [<ffffffff812e65b0>] cpu_relax arch/x86/include/asm/processor.h:589 [inline]
RIP: 0010:[<ffffffff812e65b0>]  [<ffffffff812e65b0>] csd_lock_wait kernel/smp.c:96 [inline]
RIP: 0010:[<ffffffff812e65b0>]  [<ffffffff812e65b0>] smp_call_function_single+0x120/0x380 kernel/smp.c:288
RSP: 0018:ffff8801d9926d10  EFLAGS: 00000297
RAX: ffff8801d98a0000 RBX: 1ffff1003b324da5 RCX: 1ffffffff083f87c
RDX: 0000000000000000 RSI: 00000000000000fb RDI: 0000000000000246
RBP: ffff8801d9926dd0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 1ffff1003b324dae R12: ffff8801d9926da8
R13: 0000000000000000 R14: ffff8801d9926e90 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fea53db69b8 CR3: 00000001d0700000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff81cde9b2 ffffffff810f02e0 00000000817259e4 0000000041b58ab3
 ffffffff841899f9 ffffffff812e6490 0000000000000040 0000000000000000
 ffffffff810f02e0 ffff8801d9926e90 0000000000000003 ffff8801d9926d90
Call Trace:
 [<ffffffff812e746c>] smp_call_function_many+0x44c/0x6a0 kernel/smp.c:420
 [<ffffffff810f14c4>] native_flush_tlb_others+0xd4/0x510 arch/x86/mm/tlb.c:287
 [<ffffffff810f215d>] flush_tlb_others arch/x86/include/asm/paravirt.h:324 [inline]
 [<ffffffff810f215d>] flush_tlb_page+0xdd/0x190 arch/x86/mm/tlb.c:394
 [<ffffffff8150150d>] ptep_clear_flush+0xad/0xe0 mm/pgtable-generic.c:80
 [<ffffffff814f1380>] page_mkclean_one+0x100/0x230 mm/rmap.c:1069
 [<ffffffff814efc9d>] rmap_walk_file+0x2bd/0x770 mm/rmap.c:1874
 [<ffffffff814f6f1d>] rmap_walk+0xed/0x180 mm/rmap.c:1894
 [<ffffffff814f7624>] page_mkclean+0x194/0x1d0 mm/rmap.c:1113
 [<ffffffff8145be9c>] clear_page_dirty_for_io+0x1fc/0x4d0 mm/page-writeback.c:2688
 [<ffffffff817259b3>] mpage_submit_page+0xe3/0x200 fs/ext4/inode.c:2131
 [<ffffffff81725e91>] mpage_process_page_bufs+0x3c1/0x490 fs/ext4/inode.c:2237
 [<ffffffff8172a5ae>] mpage_prepare_extent_to_map+0x66e/0xab0 fs/ext4/inode.c:2616
 [<ffffffff8173b749>] ext4_writepages+0xd49/0x2f20 fs/ext4/inode.c:2777
 [<ffffffff8145ed0d>] do_writepages+0xed/0x1c0 mm/page-writeback.c:2347
 [<ffffffff815fbc19>] __writeback_single_inode+0xd9/0xfe0 fs/fs-writeback.c:1305
 [<ffffffff815fd6d2>] writeback_sb_inodes+0x4f2/0xe50 fs/fs-writeback.c:1569
 [<ffffffff815fe12b>] __writeback_inodes_wb+0xfb/0x1e0 fs/fs-writeback.c:1638
 [<ffffffff815fe8c2>] wb_writeback+0x512/0xbd0 fs/fs-writeback.c:1747
 [<ffffffff816080c1>] wb_check_old_data_flush fs/fs-writeback.c:1862 [inline]
 [<ffffffff816080c1>] wb_do_writeback fs/fs-writeback.c:1893 [inline]
 [<ffffffff816080c1>] wb_workfn+0x501/0xea0 fs/fs-writeback.c:1922
 [<ffffffff8118a28f>] process_one_work+0x78f/0x15f0 kernel/workqueue.c:2096
 [<ffffffff8118b215>] worker_thread+0x125/0x1020 kernel/workqueue.c:2230
 [<ffffffff8119afdd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff838af42a>] ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:433
Code: 95 48 ff ff ff 49 8d 74 24 a0 4c 89 f1 8b bd 54 ff ff ff e8 03 fc ff ff 41 89 c5 41 8b 44 24 b8 a8 01 74 10 e8 02 44 08 00 f3 90 <41> 8b 44 24 b8 a8 01 75 f0 e8 f2 43 08 00 e8 ed 43 08 00 bf 01