ip6_tunnel: ip6tnl1 xmit: Local address not yet configured! INFO: task syz-executor.5:9394 blocked for more than 140 seconds. Not tainted 4.9.170+ #45 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28280 9394 2112 0x80000002 ffff8801cd5a97c0 ffff88019ec71b80 ffff8801db721000 ffff8801cf9eaf80 ffff8801db721018 ffff8801c791f6b8 ffffffff8280185e 0000000041b58ab3 ffffffff82e286c8 00ffffff811ffe30 ffff8801db7218f0 1ffff10038f23ec6 Call Trace: [<000000007ce8edb7>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<00000000442c1854>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<000000000be0d562>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<000000000be0d562>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<00000000eaa18b44>] lo_release+0x1e/0x1b0 drivers/block/loop.c:1664 [<00000000c1a3b48f>] __blkdev_put+0x461/0x840 fs/block_dev.c:1606 [<0000000061ae86f9>] blkdev_put+0x88/0x560 fs/block_dev.c:1671 [<000000007dd6c309>] blkdev_close+0x8b/0xb0 fs/block_dev.c:1678 [<000000004b58a5cd>] __fput+0x274/0x720 fs/file_table.c:208 [<000000008ec12f90>] ____fput+0x16/0x20 fs/file_table.c:244 [<0000000041133ef2>] task_work_run+0x108/0x180 kernel/task_work.c:116 [<000000007b1b2e51>] exit_task_work include/linux/task_work.h:21 [inline] [<000000007b1b2e51>] do_exit+0x78b/0x2aa0 kernel/exit.c:841 [<00000000f7308a76>] do_group_exit+0x111/0x300 kernel/exit.c:945 [<000000008bb13dbf>] get_signal+0x348/0x1aa0 kernel/signal.c:2380 [<00000000bf7f0896>] do_signal+0x9c/0x1920 arch/x86/kernel/signal.c:807 [<00000000aeaa09f0>] exit_to_usermode_loop+0x11c/0x160 arch/x86/entry/common.c:158 [<00000000388d165a>] prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] [<00000000388d165a>] syscall_return_slowpath arch/x86/entry/common.c:263 [inline] [<00000000388d165a>] do_syscall_64+0x3f7/0x570 arch/x86/entry/common.c:290 [<000000004764ab98>] 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: [<00000000a46b9e07>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<00000000a46b9e07>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.+..}, at: [<000000000863b0d2>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4339 2 locks held by getty/2020: #0: (&tty->ldisc_sem){++++++}, at: [<00000000bfe289d3>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+.+.}, at: [<000000003cc41bfb>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 2 locks held by syz-executor.5/9394: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000004476c37a>] __blkdev_put+0xbb/0x840 fs/block_dev.c:1587 #1: (loop_index_mutex){+.+.+.}, at: [<00000000eaa18b44>] lo_release+0x1e/0x1b0 drivers/block/loop.c:1664 1 lock held by syz-executor.5/16415: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000a24487d9>] blkdev_put+0x2b/0x560 fs/block_dev.c:1629 2 locks held by syz-executor.1/7685: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000558ae082>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<0000000021d4231f>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 3 locks held by blkid/8282: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000004476c37a>] __blkdev_put+0xbb/0x840 fs/block_dev.c:1587 #1: (loop_index_mutex){+.+.+.}, at: [<00000000eaa18b44>] lo_release+0x1e/0x1b0 drivers/block/loop.c:1664 #2: (loop_ctl_mutex#2){+.+.+.}, at: [<000000002f348c61>] __lo_release drivers/block/loop.c:1642 [inline] #2: (loop_ctl_mutex#2){+.+.+.}, at: [<000000002f348c61>] lo_release+0x84/0x1b0 drivers/block/loop.c:1665 1 lock held by syz-executor.3/8300: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000558ae082>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 2 locks held by syz-executor.2/8292: #0: (loop_ctl_mutex/1){+.+.+.}, at: [<000000002cb5e969>] lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405 #1: (&bdev->bd_mutex){+.+.+.}, at: [<000000007101b496>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189 2 locks held by syz-executor.5/8299: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000558ae082>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<0000000021d4231f>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 2 locks held by blkid/8295: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000558ae082>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<0000000021d4231f>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 1 lock held by syz-executor.2/8329: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000558ae082>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.170+ #45 ffff8801d98d7cc8 ffffffff81b4fb21 0000000000000001 0000000000000000 0000000000000001 ffffffff81097401 dffffc0000000000 ffff8801d98d7d00 ffffffff81b5adbc 0000000000000001 0000000000000000 0000000000000001 Call Trace: [<0000000081151b86>] __dump_stack lib/dump_stack.c:15 [inline] [<0000000081151b86>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<0000000018896c54>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<000000001344af5b>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<00000000edae23a4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<000000003e245c6c>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<000000003e245c6c>] check_hung_task kernel/hung_task.c:126 [inline] [<000000003e245c6c>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<000000003e245c6c>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<00000000f072110c>] kthread+0x278/0x310 kernel/kthread.c:211 [<00000000c6735f8e>] 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