ip6_tunnel: + xmit: Local address not yet configured! ip6_tunnel: K xmit: Local address not yet configured! ip6_tunnel: + xmit: Local address not yet configured! ip6_tunnel: K xmit: Local address not yet configured! INFO: task syz-executor.1:31874 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.1 D25544 31874 1 0x00000004 0000000000000087 ffff8801d76faf80 ffff8801ab894200 ffff8801db621000 ffff8801a1c917c0 ffff8801db621018 ffff8801b01e76a8 ffffffff8281af8e 0000000000000246 ffffffff831f3ca8 00ff8801d76fb828 ffff8801db6218f0 Call Trace: [<00000000894d43f6>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<00000000a8e17da2>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<000000007af583ad>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<000000007af583ad>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<000000009afcd84e>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 [<00000000b393d975>] blkdev_get+0x2e8/0x920 fs/block_dev.c:1424 [<00000000f4922993>] blkdev_open+0x1aa/0x250 fs/block_dev.c:1579 [<000000000edc3c95>] do_dentry_open+0x422/0xd20 fs/open.c:791 [<00000000131d6220>] vfs_open+0x105/0x230 fs/open.c:904 [<0000000023dcdaf2>] do_last fs/namei.c:3541 [inline] [<0000000023dcdaf2>] path_openat+0xbf5/0x2f60 fs/namei.c:3665 [<00000000ab027923>] do_filp_open+0x1a1/0x280 fs/namei.c:3699 [<000000006cdb050f>] do_sys_open+0x2f0/0x610 fs/open.c:1097 [<00000000d322f4ae>] SYSC_open fs/open.c:1115 [inline] [<00000000d322f4ae>] SyS_open+0x2d/0x40 fs/open.c:1110 [<00000000efe5e1bf>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<0000000071bdc69f>] 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: [<0000000065f0de36>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<0000000065f0de36>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.+..}, at: [<000000002bfc3493>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336 2 locks held by getty/2020: #0: (&tty->ldisc_sem){++++++}, at: [<00000000d5cfc55e>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&ldata->atomic_read_lock){+.+.+.}, at: [<0000000008cd6abb>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.1/31874: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000009afcd84e>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 2 locks held by syz-executor.0/6286: #0: (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<000000003b6792ba>] lo_ioctl+0x8e/0x1b10 drivers/block/loop.c:1404 #1: (&bdev->bd_mutex){+.+.+.}, at: [<0000000053a49999>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189 2 locks held by syz-executor.3/6289: #0: (loop_index_mutex){+.+.+.}, at: [<0000000039ce3b2c>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1973 #1: (&lo->lo_ctl_mutex#2){+.+.+.}, at: [<000000008cac19fa>] loop_control_ioctl+0x17f/0x320 drivers/block/loop.c:1987 1 lock held by syz-executor.3/6302: #0: (loop_index_mutex){+.+.+.}, at: [<0000000039ce3b2c>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1973 2 locks held by blkid/6294: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000009afcd84e>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<0000000017639e11>] lo_open+0x1d/0xb0 drivers/block/loop.c:1621 2 locks held by blkid/6295: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000009afcd84e>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<0000000017639e11>] lo_open+0x1d/0xb0 drivers/block/loop.c:1621 1 lock held by syz-executor.2/6312: #0: (loop_index_mutex){+.+.+.}, at: [<0000000039ce3b2c>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1973 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.194+ #0 ffff8801d98d7cc8 ffffffff81b67001 0000000000000000 0000000000000000 0000000000000000 ffffffff81099d01 dffffc0000000000 ffff8801d98d7d00 ffffffff81b7229c 0000000000000000 0000000000000000 0000000000000000 Call Trace: [<00000000fb3ac6d7>] __dump_stack lib/dump_stack.c:15 [inline] [<00000000fb3ac6d7>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<00000000c2cc79d5>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<00000000c70b1b7b>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<0000000084f774b8>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<0000000047e2ba17>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<0000000047e2ba17>] check_hung_task kernel/hung_task.c:126 [inline] [<0000000047e2ba17>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<0000000047e2ba17>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<00000000e8684b54>] kthread+0x278/0x310 kernel/kthread.c:211 [<000000009e4ed225>] 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 0xffffffff8282a0e1