ip6_tunnel: ip6tnl1 xmit: Local address not yet configured! INFO: task syz-executor.4:10384 blocked for more than 140 seconds. Not tainted 4.9.170+ #48 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28280 10384 2124 0x80000002 ffff8801d02e8000 0000000000000000 ffff8801db721000 ffff8801d09b17c0 ffff8801db721018 ffff8801a5d076b8 ffffffff82801a4e 0000000000000046 1ffff10034ba0ec6 00ff8801a5d07638 ffff8801db7218f0 1ffff10034ba0ec6 Call Trace: [<00000000dfa5a874>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<0000000039529c9f>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<00000000f6772715>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<00000000f6772715>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<00000000c76e808a>] lo_release+0x1e/0x1b0 drivers/block/loop.c:1664 [<00000000971c9a0e>] __blkdev_put+0x461/0x840 fs/block_dev.c:1606 [<0000000015de2813>] blkdev_put+0x88/0x560 fs/block_dev.c:1671 [<00000000eed5032a>] blkdev_close+0x8b/0xb0 fs/block_dev.c:1678 [<000000005275544e>] __fput+0x274/0x720 fs/file_table.c:208 [<00000000126eb61d>] ____fput+0x16/0x20 fs/file_table.c:244 [<0000000036bf1f19>] task_work_run+0x108/0x180 kernel/task_work.c:116 [<000000008e6e04d2>] exit_task_work include/linux/task_work.h:21 [inline] [<000000008e6e04d2>] do_exit+0x78b/0x2aa0 kernel/exit.c:841 [<00000000db1f33ff>] do_group_exit+0x111/0x300 kernel/exit.c:945 [<000000008552ac9b>] get_signal+0x348/0x1aa0 kernel/signal.c:2380 [<00000000ff3b4061>] do_signal+0x9c/0x1920 arch/x86/kernel/signal.c:807 [<00000000922c6b24>] exit_to_usermode_loop+0x11c/0x160 arch/x86/entry/common.c:158 [<00000000ce5b9855>] prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] [<00000000ce5b9855>] syscall_return_slowpath arch/x86/entry/common.c:263 [inline] [<00000000ce5b9855>] do_syscall_64+0x3f7/0x570 arch/x86/entry/common.c:290 [<000000000c0d041c>] 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: [<00000000c826841e>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<00000000c826841e>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.+..}, at: [<0000000051633aae>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4339 1 lock held by rsyslogd/1906: #0: (&f->f_pos_lock){+.+.+.}, at: [<0000000078fbd8fc>] __fdget_pos+0xa8/0xd0 fs/file.c:782 2 locks held by getty/2033: #0: (&tty->ldisc_sem){++++++}, at: [<000000003fb556eb>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+.+.}, at: [<0000000076735988>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 2 locks held by syz-executor.4/10384: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000781e652c>] __blkdev_put+0xbb/0x840 fs/block_dev.c:1587 #1: (loop_index_mutex){+.+.+.}, at: [<00000000c76e808a>] lo_release+0x1e/0x1b0 drivers/block/loop.c:1664 2 locks held by syz-executor.3/22320: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000308cf582>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<00000000bddd290d>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 1 lock held by syz-executor.1/22326: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000308cf582>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 2 locks held by syz-executor.4/26837: #0: (loop_ctl_mutex/1){+.+.+.}, at: [<0000000064959785>] lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405 #1: (&bdev->bd_mutex){+.+.+.}, at: [<000000005db057cf>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189 1 lock held by syz-executor.4/26850: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000308cf582>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 3 locks held by blkid/26832: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000781e652c>] __blkdev_put+0xbb/0x840 fs/block_dev.c:1587 #1: (loop_index_mutex){+.+.+.}, at: [<00000000c76e808a>] lo_release+0x1e/0x1b0 drivers/block/loop.c:1664 #2: (loop_ctl_mutex#2){+.+.+.}, at: [<00000000a11b793c>] __lo_release drivers/block/loop.c:1642 [inline] #2: (loop_ctl_mutex#2){+.+.+.}, at: [<00000000a11b793c>] lo_release+0x84/0x1b0 drivers/block/loop.c:1665 2 locks held by blkid/26844: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000308cf582>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<00000000bddd290d>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.170+ #48 ffff8801d98d7cc8 ffffffff81b4fb21 0000000000000000 0000000000000000 0000000000000000 ffffffff81097401 dffffc0000000000 ffff8801d98d7d00 ffffffff81b5adbc 0000000000000000 0000000000000000 0000000000000000 Call Trace: [<0000000078b96580>] __dump_stack lib/dump_stack.c:15 [inline] [<0000000078b96580>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<00000000eb761f2b>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<00000000c68703da>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<00000000382ebcb7>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<00000000bf30bb38>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<00000000bf30bb38>] check_hung_task kernel/hung_task.c:126 [inline] [<00000000bf30bb38>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<00000000bf30bb38>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<000000004133bcfd>] kthread+0x278/0x310 kernel/kthread.c:211 [<000000007ace58f7>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff82810ac2