ip6_tunnel: ­
 xmit: Local address not yet configured!
ip6_tunnel: ¤ xmit: Local address not yet configured!
ip6_tunnel: Ã
 xmit: Local address not yet configured!
ip6_tunnel: ­
 xmit: Local address not yet configured!
INFO: task syz-executor.5:26924 blocked for more than 140 seconds.
      Not tainted 4.9.194+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5  D29992 26924  24346 0x00000004
 0000000000000087 ffff88018f684740 ffff8801a136d800 ffff8801db721000
 ffff88018f682f80 ffff8801db721018 ffff8801ca4afb68 ffffffff8281af8e
 0000000000000000 0000000000000000 000000000000004c ffff8801db7218f0
Call Trace:
 [<000000009765f81b>] schedule+0x92/0x1c0 kernel/sched/core.c:3546
 [<0000000030d6e2c5>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579
 [<00000000fd0fee2b>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<00000000fd0fee2b>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621
 [<000000009fea64db>] loop_control_ioctl+0x17f/0x320 drivers/block/loop.c:1987
 [<000000005c9d2427>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<000000005c9d2427>] file_ioctl fs/ioctl.c:493 [inline]
 [<000000005c9d2427>] do_vfs_ioctl+0xb87/0x11d0 fs/ioctl.c:677
 [<00000000f9885fb3>] SYSC_ioctl fs/ioctl.c:694 [inline]
 [<00000000f9885fb3>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
 [<00000000ad810ee8>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288
 [<00000000a3402c90>] 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: [<00000000691fb868>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline]
 #0:  (rcu_read_lock){......}, at: [<00000000691fb868>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263
 #1:  (tasklist_lock){.+.+..}, at: [<000000007f8dec71>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336
2 locks held by getty/2023:
 #0:  (&tty->ldisc_sem){++++++}, at: [<000000008927877d>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<000000003bf70e87>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.5/26924:
 #0:  (loop_index_mutex){+.+.+.}, at: [<00000000b4a30b04>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1973
 #1:  (&lo->lo_ctl_mutex#2){+.+.+.}, at: [<000000009fea64db>] loop_control_ioctl+0x17f/0x320 drivers/block/loop.c:1987
1 lock held by syz-executor.5/26930:
 #0:  (loop_index_mutex){+.+.+.}, at: [<00000000b4a30b04>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1973
2 locks held by syz-executor.2/26907:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<000000004860aa0b>] __blkdev_put+0xbb/0x840 fs/block_dev.c:1587
 #1:  (loop_index_mutex){+.+.+.}, at: [<000000009dbc9048>] lo_release+0x20/0x1b0 drivers/block/loop.c:1663
2 locks held by syz-executor.0/26912:
 #0:  (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<00000000575f491e>] lo_ioctl+0x8e/0x1b10 drivers/block/loop.c:1404
 #1:  (&bdev->bd_mutex){+.+.+.}, at: [<000000001c7bf8ea>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189
2 locks held by blkid/26923:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<00000000f71db318>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
 #1:  (loop_index_mutex){+.+.+.}, at: [<00000000b297baf0>] lo_open+0x1d/0xb0 drivers/block/loop.c:1621

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

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.194+ #0
 ffff8801d98d7cc8 ffffffff81b67001 0000000000000001 0000000000000000
 0000000000000001 ffffffff81099d01 dffffc0000000000 ffff8801d98d7d00
 ffffffff81b7229c 0000000000000001 0000000000000000 0000000000000001
Call Trace:
 [<000000000cb881ad>] __dump_stack lib/dump_stack.c:15 [inline]
 [<000000000cb881ad>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<00000000d5d39ac5>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99
 [<00000000b5c701ca>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60
 [<000000005de47048>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<00000000d1f85c9a>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<00000000d1f85c9a>] check_hung_task kernel/hung_task.c:126 [inline]
 [<00000000d1f85c9a>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline]
 [<00000000d1f85c9a>] watchdog+0x670/0xaf0 kernel/hung_task.c:263
 [<000000002ff6e795>] kthread+0x278/0x310 kernel/kthread.c:211
 [<00000000b8cf8ffc>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff8282a0e1