ip6_tunnel: ip6tnl2 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: ip6tnl1 xmit: Local address not yet configured! ip6_tunnel: ip6tnl2 xmit: Local address not yet configured! INFO: task syz-executor.0:2124 blocked for more than 140 seconds. ip6_tunnel: ip6tnl1 xmit: Local address not yet configured! Not tainted 4.9.167+ #38 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D25016 2124 1 0x00000004 ffff8801ce7817c0 ffff8801d7640000 ffff8801db721000 ffff8801d1622f80 ffff8801db721018 ffff8801b113f538 ffffffff827ffcae 1ffff10036227e9d 0000000000000000 00ffffff830c1cc0 ffff8801db7218f0 1ffff10036227e96 Call Trace: [<0000000010d363f6>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<00000000da853cd0>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<0000000002ff336b>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<0000000002ff336b>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<00000000a02fbc35>] loop_probe+0x76/0x180 drivers/block/loop.c:1953 [<00000000fbf9fb9f>] kobj_lookup+0x221/0x410 drivers/base/map.c:124 [<0000000056caab6b>] get_gendisk+0x3c/0x2d0 block/genhd.c:716 [<0000000065d5741b>] __blkdev_get+0x356/0xeb0 fs/block_dev.c:1267 [<00000000d1f101bc>] blkdev_get+0x2e8/0x920 fs/block_dev.c:1424 [<000000008973493f>] blkdev_open+0x1aa/0x250 fs/block_dev.c:1579 [<0000000006600ed0>] do_dentry_open+0x422/0xd20 fs/open.c:772 [<0000000009b05a5e>] vfs_open+0x105/0x230 fs/open.c:885 [<0000000024d98086>] do_last fs/namei.c:3457 [inline] [<0000000024d98086>] path_openat+0xbf5/0x2f60 fs/namei.c:3581 [<0000000073b2e018>] do_filp_open+0x1a1/0x280 fs/namei.c:3615 [<000000000a1520d4>] do_sys_open+0x2f0/0x610 fs/open.c:1078 [<00000000ba575e72>] SYSC_open fs/open.c:1096 [inline] [<00000000ba575e72>] SyS_open+0x2d/0x40 fs/open.c:1091 [<00000000cad32897>] do_syscall_64+0x1ad/0x570 arch/x86/entry/common.c:285 [<0000000066643294>] 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: [<00000000b5e71dc9>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline] #0: (rcu_read_lock){......}, at: [<00000000b5e71dc9>] watchdog+0x13c/0xae0 kernel/hung_task.c:239 #1: (tasklist_lock){.+.+..}, at: [<000000003cc11774>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4339 2 locks held by getty/2040: #0: (&tty->ldisc_sem){++++++}, at: [<00000000d33a732d>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+...}, at: [<00000000e43019f3>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.0/2124: #0: (loop_index_mutex){+.+.+.}, at: [<00000000a02fbc35>] loop_probe+0x76/0x180 drivers/block/loop.c:1953 2 locks held by syz-executor.5/2143: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000001e6d3146>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<000000001d1b8740>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 2 locks held by syz-executor.3/2157: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000001e6d3146>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<000000001d1b8740>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 2 locks held by syz-executor.1/8366: #0: (loop_ctl_mutex/1){+.+.+.}, at: [<00000000bbecc84e>] lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405 #1: (&bdev->bd_mutex){+.+.+.}, at: [<000000005b1f9780>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189 1 lock held by syz-executor.1/8387: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000001e6d3146>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 3 locks held by blkid/8367: #0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000034ce34fc>] __blkdev_put+0xbb/0x840 fs/block_dev.c:1587 #1: (loop_index_mutex){+.+.+.}, at: [<0000000014249df6>] lo_release+0x1e/0x1b0 drivers/block/loop.c:1664 #2: (loop_ctl_mutex#2){+.+.+.}, at: [<0000000088f03cc6>] __lo_release drivers/block/loop.c:1642 [inline] #2: (loop_ctl_mutex#2){+.+.+.}, at: [<0000000088f03cc6>] lo_release+0x84/0x1b0 drivers/block/loop.c:1665 2 locks held by blkid/8368: #0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000034ce34fc>] __blkdev_put+0xbb/0x840 fs/block_dev.c:1587 #1: (loop_index_mutex){+.+.+.}, at: [<0000000014249df6>] lo_release+0x1e/0x1b0 drivers/block/loop.c:1664 1 lock held by syz-executor.2/8392: #0: (loop_index_mutex){+.+.+.}, at: [<00000000ad62441e>] loop_control_ioctl+0x7a/0x2f0 drivers/block/loop.c:1973 2 locks held by blkid/8391: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000001e6d3146>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<000000001d1b8740>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.167+ #38 ffff8801d98d7cc8 ffffffff81b4f011 0000000000000001 0000000000000000 0000000000000001 ffffffff81097401 dffffc0000000000 ffff8801d98d7d00 ffffffff81b5a2cc 0000000000000001 0000000000000000 0000000000000001 Call Trace: [<00000000b09a7a44>] __dump_stack lib/dump_stack.c:15 [inline] [<00000000b09a7a44>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<00000000ad23a8dd>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<00000000e43ae666>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<00000000bb293a89>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<000000008e122e86>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<000000008e122e86>] check_hung_task kernel/hung_task.c:125 [inline] [<000000008e122e86>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline] [<000000008e122e86>] watchdog+0x661/0xae0 kernel/hung_task.c:239 [<00000000f81276f4>] kthread+0x278/0x310 kernel/kthread.c:211 [<0000000024a54f61>] 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 0xffffffff8280ed22