ip6_tunnel: < xmit: Local address not yet configured! ip6_tunnel: ; xmit: Local address not yet configured! ip6_tunnel: < xmit: Local address not yet configured! ip6_tunnel: ; xmit: Local address not yet configured! INFO: task syz-executor.0:10997 blocked for more than 140 seconds. Not tainted 4.9.194+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D26632 10997 8030 0x00000004 0000000000000083 ffff88019f135f00 ffff8801d3d27900 ffff8801db721000 ffff8801d3a897c0 ffff8801db721018 ffff8801a696f988 ffffffff8281af8e 0000000000000001 ffffffff843308c8 0000000000000000 ffff8801db7218f0 Call Trace: [<0000000047266895>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<00000000a0128d99>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<0000000021222575>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<0000000021222575>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<000000008d71faff>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189 [<00000000a75431fe>] loop_reread_partitions+0x7c/0x90 drivers/block/loop.c:637 [<00000000151b18c2>] loop_clr_fd+0x7dd/0xa60 drivers/block/loop.c:1081 [<000000003b8450e2>] lo_ioctl+0x7e9/0x1b10 drivers/block/loop.c:1414 [<0000000016ffaf5f>] __blkdev_driver_ioctl block/ioctl.c:294 [inline] [<0000000016ffaf5f>] blkdev_ioctl+0xe14/0x19e0 block/ioctl.c:590 [<00000000153d8e16>] block_ioctl+0xde/0x120 fs/block_dev.c:1696 [<000000008cde8bc7>] vfs_ioctl fs/ioctl.c:43 [inline] [<000000008cde8bc7>] file_ioctl fs/ioctl.c:493 [inline] [<000000008cde8bc7>] do_vfs_ioctl+0xb87/0x11d0 fs/ioctl.c:677 [<00000000e807591b>] SYSC_ioctl fs/ioctl.c:694 [inline] [<00000000e807591b>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685 [<00000000c6a414ef>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<00000000e3eaf957>] 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: [<0000000054a18e1b>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<0000000054a18e1b>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.+..}, at: [<000000008fa738d5>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336 1 lock held by rsyslogd/1897: #0: (&f->f_pos_lock){+.+.+.}, at: [<00000000bb496215>] __fdget_pos+0xa8/0xd0 fs/file.c:782 2 locks held by getty/2027: #0: (&tty->ldisc_sem){++++++}, at: [<000000009088fa6e>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&ldata->atomic_read_lock){+.+.+.}, at: [<000000001c1e4371>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 2 locks held by syz-executor.0/10997: #0: (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<00000000f0c256dc>] lo_ioctl+0x8e/0x1b10 drivers/block/loop.c:1404 #1: (&bdev->bd_mutex){+.+.+.}, at: [<000000008d71faff>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189 1 lock held by syz-executor.0/11012: #0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000022155def>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 2 locks held by syz-executor.5/11013: #0: (loop_index_mutex){+.+.+.}, at: [<0000000040698477>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1973 #1: (&lo->lo_ctl_mutex#2){+.+.+.}, at: [<000000001e3b45c5>] loop_control_ioctl+0x17f/0x320 drivers/block/loop.c:1987 1 lock held by syz-executor.2/11000: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000a0ca1fd2>] blkdev_put+0x2b/0x560 fs/block_dev.c:1629 2 locks held by syz-executor.2/11003: #0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000043951997>] __blkdev_put+0xbb/0x840 fs/block_dev.c:1587 #1: (loop_index_mutex){+.+.+.}, at: [<000000008450d096>] lo_release+0x20/0x1b0 drivers/block/loop.c:1663 1 lock held by syz-executor.2/11011: #0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000022155def>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 1 lock held by syz-executor.2/11021: #0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000022155def>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 1 lock held by blkid/11008: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000a0ca1fd2>] blkdev_put+0x2b/0x560 fs/block_dev.c:1629 2 locks held by blkid/11016: #0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000022155def>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<00000000b7a814b9>] lo_open+0x1d/0xb0 drivers/block/loop.c:1621 2 locks held by syz-executor.1/11060: #0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000022155def>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<00000000b7a814b9>] lo_open+0x1d/0xb0 drivers/block/loop.c:1621 1 lock held by syz-executor.1/11114: #0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000022155def>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 2 locks held by syz-executor.4/11124: #0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000022155def>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<00000000b7a814b9>] lo_open+0x1d/0xb0 drivers/block/loop.c:1621 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.194+ #0 ffff8801d98d7cc8 ffffffff81b67001 0000000000000001 0000000000000000 0000000000000001 ffffffff81099d01 dffffc0000000000 ffff8801d98d7d00 ffffffff81b7229c 0000000000000001 0000000000000000 0000000000000001 Call Trace: [<00000000982a54ae>] __dump_stack lib/dump_stack.c:15 [inline] [<00000000982a54ae>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<00000000c52892d2>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<00000000ae2b7a34>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<000000007caa1460>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<0000000080adeb58>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<0000000080adeb58>] check_hung_task kernel/hung_task.c:126 [inline] [<0000000080adeb58>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<0000000080adeb58>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<000000005fbbbde5>] kthread+0x278/0x310 kernel/kthread.c:211 [<00000000f6a67c5e>] 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 0xffffffff8282a0e1