ip6_tunnel:  xmit: Local address not yet configured! ip6_tunnel:  xmit: Local address not yet configured! INFO: task syz-executor.2:22610 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.2 D25544 22610 1 0x00000004 0000000000000083 ffff88019dac17c0 0000000000000000 ffff8801db721000 ffff8801da6b2f80 ffff8801db721018 ffff8801d1ab7688 ffffffff8281af8e ffff88019dac17c0 ffffffff841f8b40 00ff8801d1ab75e8 ffff8801db7218f0 Call Trace: [<000000003ffbda57>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<00000000e85a4f33>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<000000009949916c>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<000000009949916c>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<000000008b41ac57>] lo_open+0x1d/0xb0 drivers/block/loop.c:1621 [<00000000a755b153>] __blkdev_get+0x268/0xeb0 fs/block_dev.c:1287 [<0000000076653d40>] blkdev_get+0x2e8/0x920 fs/block_dev.c:1424 [<00000000eaaa75c3>] blkdev_open+0x1aa/0x250 fs/block_dev.c:1579 [<00000000c1bcf4a0>] do_dentry_open+0x422/0xd20 fs/open.c:791 [<0000000032afe62b>] vfs_open+0x105/0x230 fs/open.c:904 [<00000000bfe739e9>] do_last fs/namei.c:3541 [inline] [<00000000bfe739e9>] path_openat+0xbf5/0x2f60 fs/namei.c:3665 [<00000000f1934af9>] do_filp_open+0x1a1/0x280 fs/namei.c:3699 [<0000000035c5f514>] do_sys_open+0x2f0/0x610 fs/open.c:1097 [<000000000266fcfb>] SYSC_open fs/open.c:1115 [inline] [<000000000266fcfb>] SyS_open+0x2d/0x40 fs/open.c:1110 [<00000000b7859431>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<000000004f24925b>] 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: [<00000000d24b3dc2>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<00000000d24b3dc2>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.+..}, at: [<00000000b5277e9d>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336 2 locks held by rs:main Q:Reg/1891: #0: (&f->f_pos_lock){+.+.+.}, at: [<00000000459cfd46>] __fdget_pos+0xa8/0xd0 fs/file.c:782 #1: (sb_writers#4){.+.+.+}, at: [<00000000eb991e1d>] file_start_write include/linux/fs.h:2646 [inline] #1: (sb_writers#4){.+.+.+}, at: [<00000000eb991e1d>] vfs_write+0x3e9/0x520 fs/read_write.c:558 2 locks held by getty/2021: #0: (&tty->ldisc_sem){++++++}, at: [<000000006ef9f20d>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&ldata->atomic_read_lock){+.+.+.}, at: [<000000009c1ec42d>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 2 locks held by syz-executor.2/22610: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000ac3232c8>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<000000008b41ac57>] lo_open+0x1d/0xb0 drivers/block/loop.c:1621 2 locks held by syz-executor.0/27860: #0: (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<00000000c92b337d>] lo_ioctl+0x8e/0x1b10 drivers/block/loop.c:1404 #1: (&bdev->bd_mutex){+.+.+.}, at: [<00000000bbe2ef56>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189 2 locks held by syz-executor.5/29103: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000ac3232c8>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<000000008b41ac57>] lo_open+0x1d/0xb0 drivers/block/loop.c:1621 1 lock held by syz-executor.3/29340: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000e3566264>] blkdev_put+0x2b/0x560 fs/block_dev.c:1629 1 lock held by syz-executor.3/29347: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000ac3232c8>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 2 locks held by syz-executor.4/29346: #0: (loop_index_mutex){+.+.+.}, at: [<0000000021522f99>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1973 #1: (&lo->lo_ctl_mutex#2){+.+.+.}, at: [<000000005997b820>] loop_control_ioctl+0x17f/0x320 drivers/block/loop.c:1987 1 lock held by syz-executor.4/29357: #0: (loop_index_mutex){+.+.+.}, at: [<0000000021522f99>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1973 1 lock held by syz-executor.4/29358: #0: (loop_index_mutex){+.+.+.}, at: [<0000000021522f99>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1973 1 lock held by syz-executor.4/29359: #0: (loop_index_mutex){+.+.+.}, at: [<0000000021522f99>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1973 2 locks held by syz-executor.1/29348: #0: (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<00000000c92b337d>] lo_ioctl+0x8e/0x1b10 drivers/block/loop.c:1404 #1: (&bdev->bd_mutex){+.+.+.}, at: [<00000000bbe2ef56>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189 1 lock held by syz-executor.1/29361: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000ac3232c8>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 3 locks held by blkid/29354: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000ac3232c8>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (&bdev->bd_mutex/1){+.+...}, at: [<00000000ac3232c8>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #2: (loop_index_mutex){+.+.+.}, at: [<000000008b41ac57>] lo_open+0x1d/0xb0 drivers/block/loop.c:1621 2 locks held by blkid/29355: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000ac3232c8>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<000000008b41ac57>] lo_open+0x1d/0xb0 drivers/block/loop.c:1621 ============================================= 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: [<000000005de54567>] __dump_stack lib/dump_stack.c:15 [inline] [<000000005de54567>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<000000000638adec>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<000000006a8b6fe5>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<000000008a616efd>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<0000000087d3e063>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<0000000087d3e063>] check_hung_task kernel/hung_task.c:126 [inline] [<0000000087d3e063>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<0000000087d3e063>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<000000000fdc79c8>] kthread+0x278/0x310 kernel/kthread.c:211 [<00000000f851e662>] 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