ip6_tunnel: ip6tnl2 xmit: Local address not yet configured! INFO: task syz-executor.4:28440 blocked for more than 140 seconds. Not tainted 4.9.170+ #47 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D27752 28440 2123 0x80000002 ffff8801910017c0 0000000000000000 ffff8801db721000 ffff8801da6817c0 ffff8801db721018 ffff880192f2f6b8 ffffffff8280185e 0000000000000046 1ffff100325e5ec6 00ff880192f2f638 ffff8801db7218f0 1ffff100325e5ec6 Call Trace: [<00000000a738c9fb>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<000000008da8015e>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<000000001a232c35>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<000000001a232c35>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<000000007271ca07>] lo_release+0x1e/0x1b0 drivers/block/loop.c:1664 [<000000007626d72c>] __blkdev_put+0x461/0x840 fs/block_dev.c:1606 [<00000000854fbb81>] blkdev_put+0x88/0x560 fs/block_dev.c:1671 [<0000000078d73059>] blkdev_close+0x8b/0xb0 fs/block_dev.c:1678 [<00000000ddf2af97>] __fput+0x274/0x720 fs/file_table.c:208 [<00000000685f3ec1>] ____fput+0x16/0x20 fs/file_table.c:244 [<00000000a17bdcdd>] task_work_run+0x108/0x180 kernel/task_work.c:116 [<0000000010a7f1af>] exit_task_work include/linux/task_work.h:21 [inline] [<0000000010a7f1af>] do_exit+0x78b/0x2aa0 kernel/exit.c:841 [<000000007913da5b>] do_group_exit+0x111/0x300 kernel/exit.c:945 [<00000000167d3bf6>] get_signal+0x348/0x1aa0 kernel/signal.c:2380 [<00000000d67e47c8>] do_signal+0x9c/0x1920 arch/x86/kernel/signal.c:807 [<000000006238cd83>] exit_to_usermode_loop+0x11c/0x160 arch/x86/entry/common.c:158 [<0000000021c3604e>] prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] [<0000000021c3604e>] syscall_return_slowpath arch/x86/entry/common.c:263 [inline] [<0000000021c3604e>] do_syscall_64+0x3f7/0x570 arch/x86/entry/common.c:290 [<00000000b81e770f>] 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: [<00000000aa5479cb>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<00000000aa5479cb>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.+..}, at: [<0000000008d44dbc>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4339 1 lock held by rsyslogd/1905: #0: (&f->f_pos_lock){+.+.+.}, at: [<0000000083f0a000>] __fdget_pos+0xa8/0xd0 fs/file.c:782 2 locks held by getty/2033: #0: (&tty->ldisc_sem){++++++}, at: [<00000000133ab1b3>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+.+.}, at: [<000000008c285e54>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 2 locks held by syz-executor.4/28440: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000006b1eef9e>] __blkdev_put+0xbb/0x840 fs/block_dev.c:1587 #1: (loop_index_mutex){+.+.+.}, at: [<000000007271ca07>] lo_release+0x1e/0x1b0 drivers/block/loop.c:1664 2 locks held by syz-executor.1/18657: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000000ab4c990>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<00000000044de142>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 2 locks held by syz-executor.5/32192: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000000ab4c990>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<00000000044de142>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 1 lock held by syz-executor.4/32189: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000000ab4c990>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 3 locks held by blkid/32194: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000006b1eef9e>] __blkdev_put+0xbb/0x840 fs/block_dev.c:1587 #1: (loop_index_mutex){+.+.+.}, at: [<000000007271ca07>] lo_release+0x1e/0x1b0 drivers/block/loop.c:1664 #2: (loop_ctl_mutex#2){+.+.+.}, at: [<0000000061e0b489>] __lo_release drivers/block/loop.c:1642 [inline] #2: (loop_ctl_mutex#2){+.+.+.}, at: [<0000000061e0b489>] lo_release+0x84/0x1b0 drivers/block/loop.c:1665 1 lock held by syz-executor.3/32208: #0: (loop_ctl_mutex/1){+.+.+.}, at: [<000000002645e3dc>] lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405 2 locks held by syz-executor.2/32210: #0: (loop_ctl_mutex/1){+.+.+.}, at: [<000000002645e3dc>] lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405 #1: (&bdev->bd_mutex){+.+.+.}, at: [<00000000d7a8bd17>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189 1 lock held by blkid/32204: #0: (loop_ctl_mutex/1){+.+.+.}, at: [<000000002645e3dc>] lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405 2 locks held by blkid/32209: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000000ab4c990>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<00000000044de142>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.170+ #47 ffff8801d98d7cc8 ffffffff81b4fb21 0000000000000001 0000000000000000 0000000000000001 ffffffff81097401 dffffc0000000000 ffff8801d98d7d00 ffffffff81b5adbc 0000000000000001 0000000000000000 0000000000000001 Call Trace: [<00000000a47dcf00>] __dump_stack lib/dump_stack.c:15 [inline] [<00000000a47dcf00>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<00000000b98fac3c>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<000000007d47d2a4>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<00000000f38d8c9c>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<000000008586a255>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<000000008586a255>] check_hung_task kernel/hung_task.c:126 [inline] [<000000008586a255>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<000000008586a255>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<0000000017b377e8>] kthread+0x278/0x310 kernel/kthread.c:211 [<00000000d25314b7>] 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 0xffffffff828108d2