ip6_tunnel:  xmit: Local address not yet configured! ip6_tunnel:  xmit: Local address not yet configured! ip6_tunnel: xmit: Local address not yet configured! ip6_tunnel:  xmit: Local address not yet configured! ip6_tunnel: xmit: Local address not yet configured! INFO: task syz-executor.0:20147 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.0 D29008 20147 2099 0x80000002 0000000000000083 ffff8801a0198000 ffff8801a6fb1b80 ffff8801db721000 ffff8801d0724740 ffff8801db721018 ffff8801acff77d8 ffffffff8281af8e ffff8801acff7748 ffffffff81bcd65c 00ffffff8282ac5a ffff8801db7218f0 Call Trace: [<000000007a639d06>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<0000000030b49aef>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<0000000001dfba6a>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<0000000001dfba6a>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<00000000e0939e53>] blkdev_put+0x2b/0x560 fs/block_dev.c:1629 [<0000000011bd493e>] blkdev_close+0x8b/0xb0 fs/block_dev.c:1678 [<00000000b0642929>] __fput+0x274/0x720 fs/file_table.c:208 [<00000000a7f3ede2>] ____fput+0x16/0x20 fs/file_table.c:244 [<0000000091b06e53>] task_work_run+0x108/0x180 kernel/task_work.c:116 [<00000000e9b623ca>] exit_task_work include/linux/task_work.h:21 [inline] [<00000000e9b623ca>] do_exit+0x78f/0x2aa0 kernel/exit.c:842 [<000000000e1402cb>] do_group_exit+0x111/0x300 kernel/exit.c:946 [<00000000ec6f31e8>] get_signal+0x377/0x1cb0 kernel/signal.c:2395 [<00000000e7792a00>] do_signal+0x9c/0x1920 arch/x86/kernel/signal.c:812 [<00000000bfce2cec>] exit_to_usermode_loop+0x11c/0x160 arch/x86/entry/common.c:159 [<000000006188e59c>] prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] [<000000006188e59c>] syscall_return_slowpath arch/x86/entry/common.c:266 [inline] [<000000006188e59c>] do_syscall_64+0x3ab/0x5c0 arch/x86/entry/common.c:293 [<0000000096d945aa>] 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: [<0000000072b429a0>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<0000000072b429a0>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.?..}, at: [<000000000a20a52b>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336 1 lock held by rsyslogd/1893: #0: (&f->f_pos_lock){+.+.+.}, at: [<00000000e8951670>] __fdget_pos+0xa8/0xd0 fs/file.c:782 2 locks held by getty/2020: #0: (&tty->ldisc_sem){++++++}, at: [<00000000d7e0dd97>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&ldata->atomic_read_lock){+.+.+.}, at: [<0000000070b9421f>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.0/20147: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000e0939e53>] blkdev_put+0x2b/0x560 fs/block_dev.c:1629 1 lock held by syz-executor.0/29789: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000e0939e53>] blkdev_put+0x2b/0x560 fs/block_dev.c:1629 2 locks held by syz-executor.3/9035: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000049331dd>] __blkdev_put+0xbb/0x840 fs/block_dev.c:1587 #1: (loop_index_mutex){+.+.+.}, at: [<00000000780eb209>] lo_release+0x20/0x1b0 drivers/block/loop.c:1663 2 locks held by syz-executor.1/12906: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000049331dd>] __blkdev_put+0xbb/0x840 fs/block_dev.c:1587 #1: (loop_index_mutex){+.+.+.}, at: [<00000000780eb209>] lo_release+0x20/0x1b0 drivers/block/loop.c:1663 2 locks held by syz-executor.4/13530: #0: (loop_index_mutex){+.+.+.}, at: [<000000004eaf5912>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1973 #1: (&lo->lo_ctl_mutex#2){+.+.+.}, at: [<00000000c753fb61>] loop_control_ioctl+0x17f/0x320 drivers/block/loop.c:1987 2 locks held by syz-executor.0/13532: #0: (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<00000000d9aba17a>] lo_ioctl+0x8e/0x1b10 drivers/block/loop.c:1404 #1: (&bdev->bd_mutex){+.+.+.}, at: [<00000000cdf376eb>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189 1 lock held by syz-executor.0/13559: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000918ab085>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 2 locks held by blkid/13546: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000918ab085>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<0000000084d8db40>] lo_open+0x1d/0xb0 drivers/block/loop.c:1621 1 lock held by blkid/13548: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000918ab085>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 1 lock held by blkid/13549: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000918ab085>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 ============================================= 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: [<00000000a9917248>] __dump_stack lib/dump_stack.c:15 [inline] [<00000000a9917248>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<00000000af5e9f6b>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<00000000e7dd4a7d>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<00000000a559417f>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<00000000a5dcfbe0>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<00000000a5dcfbe0>] check_hung_task kernel/hung_task.c:126 [inline] [<00000000a5dcfbe0>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<00000000a5dcfbe0>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<00000000c58f89b4>] kthread+0x278/0x310 kernel/kthread.c:211 [<00000000f0683535>] 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