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.1:11239 blocked for more than 140 seconds. Not tainted 4.9.205-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D25544 11239 1 0x00000004 0000000000000083 ffff8801a6a717c0 0000000000000000 ffff8801db61ffc0 ffffffff83031180 ffff8801db61ffd8 ffff8801a9e17688 ffffffff8280a6ae 0000000041b58ab3 ffffffff82e2ad80 00ffffff81205320 ffff8801db6208b0 Call Trace: [<0000000058bab9a2>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<00000000378e85ca>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<00000000f2f05eb8>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<00000000f2f05eb8>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<000000007fade641>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 [<00000000b415b5bb>] __blkdev_get+0x268/0xeb0 fs/block_dev.c:1287 [<000000000970e022>] blkdev_get+0x2e8/0x920 fs/block_dev.c:1424 [<0000000082655891>] blkdev_open+0x1aa/0x250 fs/block_dev.c:1579 [<00000000dc63a006>] do_dentry_open+0x422/0xd20 fs/open.c:791 [<0000000075dd79f0>] vfs_open+0x105/0x230 fs/open.c:904 [<000000000759fccf>] do_last fs/namei.c:3457 [inline] [<000000000759fccf>] path_openat+0xbf5/0x2f60 fs/namei.c:3581 [<0000000064792094>] do_filp_open+0x1a1/0x280 fs/namei.c:3615 [<00000000c2f2b53a>] do_sys_open+0x2f0/0x610 fs/open.c:1097 [<000000007b47cda4>] SYSC_open fs/open.c:1115 [inline] [<000000007b47cda4>] SyS_open+0x2d/0x40 fs/open.c:1110 [<000000007587aba2>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<0000000070a432b9>] 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: [<00000000d6aca344>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<00000000d6aca344>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.?..}, at: [<000000000e48e6ec>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4339 2 locks held by rs:main Q:Reg/1893: #0: (&f->f_pos_lock){+.+.+.}, at: [<00000000f83ea58f>] __fdget_pos+0xa8/0xd0 fs/file.c:782 #1: (sb_writers#4){.+.+.+}, at: [<00000000a9506552>] file_start_write include/linux/fs.h:2645 [inline] #1: (sb_writers#4){.+.+.+}, at: [<00000000a9506552>] vfs_write+0x3e9/0x520 fs/read_write.c:558 2 locks held by getty/2023: #0: (&tty->ldisc_sem){++++++}, at: [<00000000db3ec3ab>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&ldata->atomic_read_lock){+.+.+.}, at: [<000000005f30fade>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 2 locks held by syz-executor.1/11239: #0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000016e5f4e7>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<000000007fade641>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 2 locks held by syz-executor.3/13063: #0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000016e5f4e7>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<000000007fade641>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 2 locks held by syz-executor.4/13074: #0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000016e5f4e7>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<000000007fade641>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 1 lock held by syz-executor.0/17301: #0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000016e5f4e7>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 2 locks held by syz-executor.5/18267: #0: (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<00000000d88e9e66>] lo_ioctl+0x8e/0x1b10 drivers/block/loop.c:1404 #1: (&bdev->bd_mutex){+.+.+.}, at: [<00000000d47f97ca>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189 2 locks held by syz-executor.2/18266: #0: (loop_index_mutex){+.+.+.}, at: [<000000006f49a8f5>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1974 #1: (&lo->lo_ctl_mutex#2){+.+.+.}, at: [<000000006d6420d2>] loop_control_ioctl+0x17f/0x320 drivers/block/loop.c:1988 2 locks held by blkid/18269: #0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000016e5f4e7>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<000000007fade641>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.205-syzkaller #0 ffff8801d98d7cc8 ffffffff81b55e6b 0000000000000000 0000000000000000 0000000000000000 ffffffff8109a001 dffffc0000000000 ffff8801d98d7d00 ffffffff81b6110c 0000000000000000 0000000000000000 0000000000000000 Call Trace: [<00000000cccef033>] __dump_stack lib/dump_stack.c:15 [inline] [<00000000cccef033>] dump_stack+0xcb/0x130 lib/dump_stack.c:56 [<0000000030ba789d>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<00000000527edaef>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<00000000ab44265c>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<0000000017222c8c>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<0000000017222c8c>] check_hung_task kernel/hung_task.c:126 [inline] [<0000000017222c8c>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<0000000017222c8c>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<00000000556e368a>] kthread+0x278/0x310 kernel/kthread.c:211 [<000000006f5d3b23>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff82819801