ip6_tunnel: ip6tnl1 xmit: Local address not yet configured!
ip6_tunnel: ip6tnl2 xmit: Local address not yet configured!
INFO: task syz-executor1:12746 blocked for more than 140 seconds.
      Not tainted 4.9.129+ #48
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1   D28232 12746   2090 0x20020004
 ffff8801cc440000 0000000000000000 ffff8801af882100 ffffffff83029180
 ffff8801db621018 ffff8801d684f8b0 ffffffff827e7d32 0000000000000292
 0000000000000002 0000000041b58ab3 00ffffff82e28daa ffff8801db6218f0
Call Trace:
 [<ffffffff827e925f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff815a1479>] wb_wait_for_completion+0x149/0x1b0 fs/fs-writeback.c:221
 [<ffffffff815a16e7>] __writeback_inodes_sb_nr+0x207/0x300 fs/fs-writeback.c:2310
 [<ffffffff815a188a>] try_to_writeback_inodes_sb_nr+0x4a/0x70 fs/fs-writeback.c:2361
 [<ffffffff815a18d5>] try_to_writeback_inodes_sb+0x25/0x30 fs/fs-writeback.c:2377
 [<ffffffff816c0fb8>] ext4_nonda_switch+0x188/0x1c0 fs/ext4/inode.c:2884
 [<ffffffff816e6ed4>] ext4_page_mkwrite+0xb94/0xfe0 fs/ext4/inode.c:5776
 [<ffffffff814926e5>] do_page_mkwrite+0x1c5/0x3e0 mm/memory.c:2061
 [<ffffffff814a271f>] do_shared_fault mm/memory.c:3258 [inline]
 [<ffffffff814a271f>] do_fault mm/memory.c:3318 [inline]
 [<ffffffff814a271f>] handle_pte_fault mm/memory.c:3516 [inline]
 [<ffffffff814a271f>] __handle_mm_fault mm/memory.c:3603 [inline]
 [<ffffffff814a271f>] handle_mm_fault+0x77f/0x2350 mm/memory.c:3640
 [<ffffffff810b28e3>] __do_page_fault+0x403/0xa60 arch/x86/mm/fault.c:1406
 [<ffffffff810b2f97>] do_page_fault+0x27/0x30 arch/x86/mm/fault.c:1469
 [<ffffffff827f8fb5>] page_fault+0x25/0x30 arch/x86/entry/entry_64.S:951

Showing all locks held in the system:
2 locks held by khungtaskd/24:
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131b83c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131b83c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813fdfe4>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/2031:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff827f6082>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81d1fe52>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
3 locks held by kworker/u4:30/12715:
 #0:  ("writeback"){++++.+}, at: [<ffffffff81130abc>] process_one_work+0x73c/0x1530 kernel/workqueue.c:2085
 #1:  ((&(&wb->dwork)->work)){+.+.+.}, at: [<ffffffff81130af4>] process_one_work+0x774/0x1530 kernel/workqueue.c:2089
 #2:  (&sbi->s_journal_flag_rwsem){.+.+.+}, at: [<ffffffff8143395f>] do_writepages+0xef/0x1d0 mm/page-writeback.c:2331
4 locks held by syz-executor1/12746:
 #0:  (&mm->mmap_sem){++++++}, at: [<ffffffff810b2752>] __do_page_fault+0x272/0xa60 arch/x86/mm/fault.c:1335
 #1:  (sb_pagefaults){.+.+..}, at: [<ffffffff816e6494>] sb_start_pagefault include/linux/fs.h:1602 [inline]
 #1:  (sb_pagefaults){.+.+..}, at: [<ffffffff816e6494>] ext4_page_mkwrite+0x154/0xfe0 fs/ext4/inode.c:5764
 #2:  (&ei->i_mmap_sem){++++.+}, at: [<ffffffff816e64ce>] ext4_page_mkwrite+0x18e/0xfe0 fs/ext4/inode.c:5767
 #3:  (&type->s_umount_key#32){++++++}, at: [<ffffffff815a1869>] try_to_writeback_inodes_sb_nr+0x29/0x70 fs/fs-writeback.c:2358
2 locks held by syz-executor4/12810:
 #0:  (sb_writers#4){.+.+.+}, at: [<ffffffff8150da80>] file_start_write include/linux/fs.h:2640 [inline]
 #0:  (sb_writers#4){.+.+.+}, at: [<ffffffff8150da80>] do_sendfile+0xa80/0xc30 fs/read_write.c:1392
 #1:  (&sbi->s_journal_flag_rwsem){.+.+.+}, at: [<ffffffff8143395f>] do_writepages+0xef/0x1d0 mm/page-writeback.c:2331
3 locks held by syz-executor4/12811:
 #0:  (sb_writers#4){.+.+.+}, at: [<ffffffff8157535f>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#4){.+.+.+}, at: [<ffffffff8157535f>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#10){++++++}, at: [<ffffffff815030e8>] inode_lock include/linux/fs.h:766 [inline]
 #1:  (&sb->s_type->i_mutex_key#10){++++++}, at: [<ffffffff815030e8>] do_truncate2+0x128/0x1f0 fs/open.c:61
 #2:  (&sbi->s_journal_flag_rwsem){.+.+.+}, at: [<ffffffff8143395f>] do_writepages+0xef/0x1d0 mm/page-writeback.c:2331
2 locks held by syz-executor4/12812:
 #0:  (sb_writers#4){.+.+.+}, at: [<ffffffff8157535f>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#4){.+.+.+}, at: [<ffffffff8157535f>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#10){++++++}, at: [<ffffffff815030e8>] inode_lock include/linux/fs.h:766 [inline]
 #1:  (&sb->s_type->i_mutex_key#10){++++++}, at: [<ffffffff815030e8>] do_truncate2+0x128/0x1f0 fs/open.c:61
2 locks held by syz-executor4/12813:
 #0:  (sb_writers#4){.+.+.+}, at: [<ffffffff8157535f>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#4){.+.+.+}, at: [<ffffffff8157535f>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#10){++++++}, at: [<ffffffff815030e8>] inode_lock include/linux/fs.h:766 [inline]
 #1:  (&sb->s_type->i_mutex_key#10){++++++}, at: [<ffffffff815030e8>] do_truncate2+0x128/0x1f0 fs/open.c:61
2 locks held by syz-executor4/12815:
 #0:  (sb_writers#4){.+.+.+}, at: [<ffffffff8150da80>] file_start_write include/linux/fs.h:2640 [inline]
 #0:  (sb_writers#4){.+.+.+}, at: [<ffffffff8150da80>] do_sendfile+0xa80/0xc30 fs/read_write.c:1392
 #1:  (&sbi->s_journal_flag_rwsem){.+.+.+}, at: [<ffffffff8143395f>] do_writepages+0xef/0x1d0 mm/page-writeback.c:2331
2 locks held by syz-executor4/12816:
 #0:  (sb_writers#4){.+.+.+}, at: [<ffffffff8157535f>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#4){.+.+.+}, at: [<ffffffff8157535f>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#10){++++++}, at: [<ffffffff815030e8>] inode_lock include/linux/fs.h:766 [inline]
 #1:  (&sb->s_type->i_mutex_key#10){++++++}, at: [<ffffffff815030e8>] do_truncate2+0x128/0x1f0 fs/open.c:61

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.129+ #48
 ffff8801d9907d08 ffffffff81b2bbb9 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff81098180 ffff8801d9907d40
 ffffffff81b36cc9 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81b2bbb9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b2bbb9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81b36cc9>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81b36c5c>] nmi_trigger_cpumask_backtrace+0x12c/0x151 lib/nmi_backtrace.c:60
 [<ffffffff81098284>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff8131bdcd>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8131bdcd>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8131bdcd>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8131bdcd>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff8114272d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff827f815c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff827f6bc6