ip6_tunnel: ip6tnl1 xmit: Local address not yet configured! INFO: task syz-executor.4:2130 blocked for more than 140 seconds. Not tainted 4.9.168+ #39 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D25528 2130 1 0x00000004 ffff8801cec72f80 ffff8801ce172100 ffff8801db721000 ffff8801ceed0000 ffff8801db721018 ffff8801a9fcf988 ffffffff8280028e 0000000000000000 ffffffff830c1d40 00ff8801a9fcf9b0 ffff8801db7218f0 1ffff100353f9f20 Call Trace: [<000000003d1faf50>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<0000000093cf4217>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<00000000284c1a9a>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<00000000284c1a9a>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<0000000098544e44>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189 [<000000004900a10f>] loop_reread_partitions+0x7c/0x90 drivers/block/loop.c:638 [<00000000bb13465d>] loop_clr_fd+0x7dd/0xa60 drivers/block/loop.c:1082 [<000000006806f453>] lo_ioctl+0x7b6/0x1a10 drivers/block/loop.c:1415 [<000000005ac863e0>] __blkdev_driver_ioctl block/ioctl.c:294 [inline] [<000000005ac863e0>] blkdev_ioctl+0xe14/0x19e0 block/ioctl.c:590 [<000000009f8babff>] block_ioctl+0xde/0x120 fs/block_dev.c:1696 [<000000005e6ff18a>] vfs_ioctl fs/ioctl.c:43 [inline] [<000000005e6ff18a>] file_ioctl fs/ioctl.c:493 [inline] [<000000005e6ff18a>] do_vfs_ioctl+0xb87/0x11d0 fs/ioctl.c:677 [<00000000d9ac2dc6>] SYSC_ioctl fs/ioctl.c:694 [inline] [<00000000d9ac2dc6>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685 [<00000000c5d47e99>] do_syscall_64+0x1ad/0x570 arch/x86/entry/common.c:285 [<000000002337636e>] 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: [<00000000035951e1>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline] #0: (rcu_read_lock){......}, at: [<00000000035951e1>] watchdog+0x13c/0xae0 kernel/hung_task.c:239 #1: (tasklist_lock){.+.?..}, at: [<000000005ab9d8eb>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4339 1 lock held by rsyslogd/1914: #0: (&f->f_pos_lock){+.+.+.}, at: [<00000000d9807c69>] __fdget_pos+0xa8/0xd0 fs/file.c:782 2 locks held by getty/2041: #0: (&tty->ldisc_sem){++++++}, at: [<00000000dab55627>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+...}, at: [<00000000d29dbd2f>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 2 locks held by syz-executor.4/2130: #0: (loop_ctl_mutex/1){+.+.+.}, at: [<00000000a7f6f5c6>] lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405 #1: (&bdev->bd_mutex){+.+.+.}, at: [<0000000098544e44>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189 2 locks held by syz-executor.3/2138: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000b7c321af>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<000000005f0f1eb5>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 2 locks held by syz-executor.5/2143: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000b7c321af>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<000000005f0f1eb5>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 3 locks held by syz-executor.1/2144: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000009f6c4200>] __blkdev_put+0xbb/0x840 fs/block_dev.c:1587 #1: (loop_index_mutex){+.+.+.}, at: [<000000001a84769d>] lo_release+0x1e/0x1b0 drivers/block/loop.c:1664 #2: (loop_ctl_mutex#2){+.+.+.}, at: [<000000006672576e>] __lo_release drivers/block/loop.c:1642 [inline] #2: (loop_ctl_mutex#2){+.+.+.}, at: [<000000006672576e>] lo_release+0x84/0x1b0 drivers/block/loop.c:1665 1 lock held by blkid/23310: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000b7c321af>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 2 locks held by blkid/23311: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000b7c321af>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<000000005f0f1eb5>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.168+ #39 ffff8801d98d7cc8 ffffffff81b4f5d1 0000000000000000 0000000000000000 0000000000000000 ffffffff81097401 dffffc0000000000 ffff8801d98d7d00 ffffffff81b5a86c 0000000000000000 0000000000000000 0000000000000000 Call Trace: [<000000000f891139>] __dump_stack lib/dump_stack.c:15 [inline] [<000000000f891139>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<0000000095c3d790>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<0000000096fb4564>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<00000000320ccbd2>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<00000000ebf8cdd8>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<00000000ebf8cdd8>] check_hung_task kernel/hung_task.c:125 [inline] [<00000000ebf8cdd8>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline] [<00000000ebf8cdd8>] watchdog+0x661/0xae0 kernel/hung_task.c:239 [<00000000c9f58d26>] kthread+0x278/0x310 kernel/kthread.c:211 [<00000000b2931c09>] 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 0xffffffff8280f302