ip6_tunnel: ip6tnl1 xmit: Local address not yet configured! ip6_tunnel: ip6tnl1 xmit: Local address not yet configured! ip6_tunnel: ip6tnl2 xmit: Local address not yet configured! ip6_tunnel: ip6tnl3 xmit: Local address not yet configured! INFO: task syz-executor.2:21687 blocked for more than 140 seconds. Not tainted 4.9.184+ #5 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29000 21687 2114 0x10000004 0000000000000087 ffff88017c4bdf00 0000000000000000 ffff8801db721000 ffff8801da6f2f80 ffff8801db721018 ffff8801765cf7c8 ffffffff8280a5ce ffffffff830c2ee0 ffff8801765cf7e8 00ff8801765cf718 ffff8801db7218f0 Call Trace: [<00000000071a1d9a>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<00000000f93d4187>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<0000000094ed8e22>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<0000000094ed8e22>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<00000000de65f6ab>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189 [<0000000005c10440>] loop_reread_partitions+0x7c/0x90 drivers/block/loop.c:637 [<0000000009874eaf>] loop_set_status+0xc02/0x1260 drivers/block/loop.c:1196 [<000000003335e90a>] loop_set_status64+0xd7/0x130 drivers/block/loop.c:1305 [<00000000ed474a01>] lo_ioctl+0x4c7/0x1b10 drivers/block/loop.c:1430 [<000000005651d352>] __blkdev_driver_ioctl block/ioctl.c:294 [inline] [<000000005651d352>] blkdev_ioctl+0xe14/0x19e0 block/ioctl.c:590 [<00000000b2354a17>] block_ioctl+0xde/0x120 fs/block_dev.c:1696 [<0000000001d5bf27>] vfs_ioctl fs/ioctl.c:43 [inline] [<0000000001d5bf27>] file_ioctl fs/ioctl.c:493 [inline] [<0000000001d5bf27>] do_vfs_ioctl+0xb87/0x11d0 fs/ioctl.c:677 [<00000000023145ba>] SYSC_ioctl fs/ioctl.c:694 [inline] [<00000000023145ba>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685 [<0000000023258291>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<0000000095fd9760>] 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: [<00000000f49fcec7>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<00000000f49fcec7>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.?..}, at: [<00000000bca90fd5>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336 1 lock held by rsyslogd/1895: #0: (&f->f_pos_lock){+.+.+.}, at: [<000000004a077a4b>] __fdget_pos+0xa8/0xd0 fs/file.c:782 2 locks held by getty/2023: #0: (&tty->ldisc_sem){++++++}, at: [<00000000f103cf24>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+...}, at: [<00000000b5f0cc8b>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.2/24987: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000007893288a>] blkdev_put+0x2b/0x560 fs/block_dev.c:1629 2 locks held by syz-executor.2/24995: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000c96f090d>] __blkdev_put+0xbb/0x840 fs/block_dev.c:1587 #1: (loop_index_mutex){+.+.+.}, at: [<00000000d63e3d38>] lo_release+0x20/0x1b0 drivers/block/loop.c:1663 2 locks held by syz-executor.2/21687: #0: (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<0000000030deb3c5>] lo_ioctl+0x8e/0x1b10 drivers/block/loop.c:1404 #1: (&bdev->bd_mutex){+.+.+.}, at: [<00000000de65f6ab>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189 1 lock held by syz-executor.2/21725: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000ca8f9e33>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 2 locks held by syz-executor.1/21683: #0: (loop_index_mutex){+.+.+.}, at: [<000000004f174b43>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1973 #1: (&lo->lo_ctl_mutex#2){+.+.+.}, at: [<000000007b779cdf>] loop_control_ioctl+0x17f/0x320 drivers/block/loop.c:1987 2 locks held by blkid/21693: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000ca8f9e33>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<000000002821065d>] lo_open+0x1d/0xb0 drivers/block/loop.c:1621 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.184+ #5 ffff8801d98d7cc8 ffffffff81b580a1 0000000000000001 0000000000000000 0000000000000001 ffffffff81099a01 dffffc0000000000 ffff8801d98d7d00 ffffffff81b6333c 0000000000000001 0000000000000000 0000000000000001 Call Trace: [<00000000c70a91bd>] __dump_stack lib/dump_stack.c:15 [inline] [<00000000c70a91bd>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<00000000ea3d70fe>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<00000000cb9fe052>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<0000000087ad1b51>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<000000006251c185>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<000000006251c185>] check_hung_task kernel/hung_task.c:126 [inline] [<000000006251c185>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<000000006251c185>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<0000000060f8f531>] kthread+0x278/0x310 kernel/kthread.c:211 [<000000007cdd0f2d>] 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 0xffffffff82819721