ip6_tunnel: A xmit: Local address not yet configured! INFO: task syz-executor.0:26577 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 D26216 26577 6208 0x00000004 0000000000000087 ffff8801c63ac740 ffff8801d4c49080 ffff8801db721000 ffff8801d3864740 ffff8801db721018 ffff8801ab5077c8 ffffffff8281af8e ffff8801ab507738 ffffffff81bcd65c 00ffffff81bcd65c ffff8801db7218f0 Call Trace: [<00000000425be3b7>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<000000006f54b4f7>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<000000006760c72d>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<000000006760c72d>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<000000007f10f6bf>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189 [<0000000088bc4001>] loop_reread_partitions+0x7c/0x90 drivers/block/loop.c:637 [<00000000dd17bc41>] loop_set_status+0xc02/0x1260 drivers/block/loop.c:1196 [<000000008ca1731b>] loop_set_status64+0xd7/0x130 drivers/block/loop.c:1305 [<00000000e3e2ceb2>] lo_ioctl+0x4c7/0x1b10 drivers/block/loop.c:1430 [<0000000080475a23>] __blkdev_driver_ioctl block/ioctl.c:294 [inline] [<0000000080475a23>] blkdev_ioctl+0xe14/0x19e0 block/ioctl.c:590 [<0000000015b07362>] block_ioctl+0xde/0x120 fs/block_dev.c:1696 [<00000000d2dd1427>] vfs_ioctl fs/ioctl.c:43 [inline] [<00000000d2dd1427>] file_ioctl fs/ioctl.c:493 [inline] [<00000000d2dd1427>] do_vfs_ioctl+0xb87/0x11d0 fs/ioctl.c:677 [<000000002ecc3f19>] SYSC_ioctl fs/ioctl.c:694 [inline] [<000000002ecc3f19>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685 [<000000003cdb2f0b>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<00000000b6782cdc>] 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: [<000000007ec4397c>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<000000007ec4397c>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.+..}, at: [<00000000283e4299>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336 1 lock held by rsyslogd/1895: #0: (&f->f_pos_lock){+.+.+.}, at: [<000000008884a928>] __fdget_pos+0xa8/0xd0 fs/file.c:782 2 locks held by getty/2023: #0: (&tty->ldisc_sem){++++++}, at: [<00000000eb541ca0>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&ldata->atomic_read_lock){+.+.+.}, at: [<0000000061b9263e>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 2 locks held by syz-executor.0/26577: #0: (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<00000000d03100b3>] lo_ioctl+0x8e/0x1b10 drivers/block/loop.c:1404 #1: (&bdev->bd_mutex){+.+.+.}, at: [<000000007f10f6bf>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189 1 lock held by syz-executor.4/26579: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000c95e5fa0>] blkdev_put+0x2b/0x560 fs/block_dev.c:1629 1 lock held by syz-executor.4/26583: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000c95e5fa0>] blkdev_put+0x2b/0x560 fs/block_dev.c:1629 1 lock held by syz-executor.2/26586: #0: (loop_index_mutex){+.+.+.}, at: [<000000004d8ddfe6>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1973 2 locks held by syz-executor.5/26588: #0: (loop_index_mutex){+.+.+.}, at: [<000000004d8ddfe6>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1973 #1: (&lo->lo_ctl_mutex#2){+.+.+.}, at: [<0000000093363c0d>] loop_control_ioctl+0x17f/0x320 drivers/block/loop.c:1987 1 lock held by syz-executor.3/26591: #0: (loop_index_mutex){+.+.+.}, at: [<000000004d8ddfe6>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1973 2 locks held by blkid/26592: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000007dae570b>] __blkdev_put+0xbb/0x840 fs/block_dev.c:1587 #1: (loop_index_mutex){+.+.+.}, at: [<00000000304bb9a0>] lo_release+0x20/0x1b0 drivers/block/loop.c:1663 2 locks held by blkid/26595: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000000c54409b>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<00000000045d1207>] 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: [<00000000d4dc0233>] __dump_stack lib/dump_stack.c:15 [inline] [<00000000d4dc0233>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<000000007e623956>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<0000000070fa2f20>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<00000000f48f1e1b>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<000000002a12ee1f>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<000000002a12ee1f>] check_hung_task kernel/hung_task.c:126 [inline] [<000000002a12ee1f>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<000000002a12ee1f>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<00000000ab9a36a5>] kthread+0x278/0x310 kernel/kthread.c:211 [<00000000726a4760>] 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 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.194+ #0 task: 000000001f6516c8 task.stack: 000000004b728fe6 RIP: 0010:[] c [<00000000ddd34476>] io_serial_in+0x6b/0x90 drivers/tty/serial/8250/8250_port.c:414 RSP: 0018:ffff8801db606dc0 EFLAGS: 00000002 RAX: dffffc0000000020 RBX: 00000000000003fd RCX: 0000000000000000 RDX: 00000000000003fd RSI: ffffffff81d86c81 RDI: ffffffff84b68e58 RBP: ffff8801db606dd0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: ffffffff841d7604 R12: ffffffff84b68e20 R13: 0000000000000020 R14: fffffbfff096d20b R15: fffffbfff096d1cd FS: 0000000000000000(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000096d3e0 CR3: 00000001d611c000 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Stack: ffffffff84b68e20c 0000000000002708c ffff8801db606e20c ffffffff81d88f24c ffffffff841d75c0c ffffffff84b68e68c ffffffff84b6905ac ffffffff841d75ccc ffffffff84b68e20c 0000000000000032c dffffc0000000000c 0000000000000032c Call Trace: d [<00000000588a3df3>] serial_in drivers/tty/serial/8250/8250.h:111 [inline] d [<00000000588a3df3>] wait_for_xmitr+0x94/0x1e0 drivers/tty/serial/8250/8250_port.c:1997 [<0000000022b3d947>] serial8250_console_putchar+0x20/0x60 drivers/tty/serial/8250/8250_port.c:3103 [<00000000fd8ac41a>] uart_console_write+0x56/0xe0 drivers/tty/serial/serial_core.c:1885 [<000000007f135fc0>] serial8250_console_write+0x2fb/0x860 drivers/tty/serial/8250/8250_port.c:3169 [<00000000ece79d0a>] univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:594 [<000000008b210425>] call_console_drivers.isra.0.constprop.0+0x1ac/0x360 kernel/printk/printk.c:1594 [<000000006a386d10>] console_unlock+0x47c/0xb20 kernel/printk/printk.c:2454 [<000000003343ddee>] vprintk_emit+0x43f/0x6f0 kernel/printk/printk.c:1908 [<000000001ea0e2ca>] vprintk+0x28/0x30 kernel/printk/printk.c:1918 [<000000007cbb3e65>] vprintk_func kernel/printk/internal.h:36 [inline] [<000000007cbb3e65>] printk+0xc2/0xf5 kernel/printk/printk.c:1980 [<00000000d11e9d4c>] ip6_tnl_xmit_ctl.cold+0x32/0x37 net/ipv6/ip6_tunnel.c:1003 [<000000005e9159d8>] ip6_tnl_xmit+0x2f8/0x3160 net/ipv6/ip6_tunnel.c:1099 [<0000000003ddefc1>] ip6ip6_tnl_xmit net/ipv6/ip6_tunnel.c:1374 [inline] [<0000000003ddefc1>] ip6_tnl_start_xmit+0x665/0x18c0 net/ipv6/ip6_tunnel.c:1397 [<000000002ceda540>] __netdev_start_xmit include/linux/netdevice.h:4072 [inline] [<000000002ceda540>] netdev_start_xmit include/linux/netdevice.h:4081 [inline] [<000000002ceda540>] xmit_one net/core/dev.c:2977 [inline] [<000000002ceda540>] dev_hard_start_xmit+0x195/0x8b0 net/core/dev.c:2993 [<00000000f477f3f1>] __dev_queue_xmit+0x11a3/0x1bd0 net/core/dev.c:3473 [<000000001596bfd9>] dev_queue_xmit+0x18/0x20 net/core/dev.c:3506 [<0000000018a033fb>] neigh_direct_output+0x16/0x20 net/core/neighbour.c:1368 [<0000000025e09c26>] dst_neigh_output include/net/dst.h:470 [inline] [<0000000025e09c26>] ip6_finish_output2+0x94f/0x1e50 net/ipv6/ip6_output.c:119 [<0000000037bbbd5a>] ip6_finish_output+0x336/0x970 net/ipv6/ip6_output.c:145 [<00000000af8e541b>] NF_HOOK_COND include/linux/netfilter.h:246 [inline] [<00000000af8e541b>] ip6_output+0x21b/0x730 net/ipv6/ip6_output.c:162 [<0000000025dd1367>] dst_output include/net/dst.h:507 [inline] [<0000000025dd1367>] NF_HOOK_THRESH include/linux/netfilter.h:232 [inline] [<0000000025dd1367>] NF_HOOK include/linux/netfilter.h:255 [inline] [<0000000025dd1367>] ndisc_send_skb+0xded/0x1300 net/ipv6/ndisc.c:483 [<00000000d2593e13>] ndisc_send_rs+0x12b/0x670 net/ipv6/ndisc.c:662 [<00000000583d9ee8>] addrconf_rs_timer+0x290/0x5c0 net/ipv6/addrconf.c:3754 [<00000000beee37ce>] call_timer_fn+0x167/0x6d0 kernel/time/timer.c:1319 [<00000000ef34e237>] expire_timers+0x25b/0x5c0 kernel/time/timer.c:1359 [<0000000006da758e>] __run_timers kernel/time/timer.c:1674 [inline] [<0000000006da758e>] run_timer_softirq+0x1ff/0x620 kernel/time/timer.c:1687 [<0000000006493211>] __do_softirq+0x22d/0x964 kernel/softirq.c:288 [<000000008f5eed94>] invoke_softirq kernel/softirq.c:368 [inline] [<000000008f5eed94>] irq_exit+0x119/0x160 kernel/softirq.c:409 [<00000000dcc94941>] exiting_irq arch/x86/include/asm/apic.h:669 [inline] [<00000000dcc94941>] smp_apic_timer_interrupt+0x7e/0xb0 arch/x86/kernel/apic/apic.c:1000 [<0000000097a6485f>] apic_timer_interrupt+0xa5/0xb0 arch/x86/entry/entry_64.S:653 d [<00000000e1680df3>] ? native_safe_halt+0x41/0x60 arch/x86/include/asm/irqflags.h:59 [<00000000888dbdac>] arch_safe_halt arch/x86/include/asm/paravirt.h:104 [inline] [<00000000888dbdac>] default_idle+0x56/0x370 arch/x86/kernel/process.c:500 [<00000000c54389ef>] arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:491 [<00000000a3ccaab1>] default_idle_call+0x36/0x60 kernel/sched/idle.c:97 [<00000000e87f95b9>] cpuidle_idle_call kernel/sched/idle.c:155 [inline] [<00000000e87f95b9>] cpu_idle_loop kernel/sched/idle.c:248 [inline] [<00000000e87f95b9>] cpu_startup_entry+0x283/0x3a0 kernel/sched/idle.c:303 [<00000000d0341985>] rest_init+0x18b/0x194 init/main.c:409 [<00000000d07eeb71>] start_kernel+0x61e/0x652 init/main.c:671 [<00000000ad228b86>] x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:196 [<000000007a3a74e7>] x86_64_start_kernel+0x137/0x15a arch/x86/kernel/head64.c:177 Code: c24 cc9 c00 c00 c00 c49 c8d c7c c24 c38 c48 cb8 c00 c00 c00 c00 c00 cfc cff cdf c48 c89 cfa c48 cc1 cea c03 cd3 ce3 c80 c3c c02 c00 c75 c17 c41 c03 c5c c24 c38 c89 cda cec c<5b> c0f cb6 cc0 c41 c5c c5d cc3 ce8 c48 c7b c77 cff ceb cc2 ce8 ca1 c7b c77 cff ceb c