[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.173' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 485.523263][ T8447] IPVS: ftp: loaded support on port[0] = 21 [ 485.569286][ T8468] netlink: 8 bytes leftover after parsing attributes in process `syz-executor594'. [ 485.579431][ T8468] netlink: 5212 bytes leftover after parsing attributes in process `syz-executor594'. [ 485.590930][ T8468] netlink: 8 bytes leftover after parsing attributes in process `syz-executor594'. [ 485.600309][ T8468] netlink: 5212 bytes leftover after parsing attributes in process `syz-executor594'. [ 721.437127][ T1648] INFO: task kworker/1:0:8439 blocked for more than 143 seconds. [ 721.445008][ T1648] Not tainted 5.11.0-rc3-syzkaller #0 [ 721.454583][ T1648] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 721.464235][ T1648] task:kworker/1:0 state:D stack:24600 pid: 8439 ppid: 2 flags:0x00004000 [ 721.475671][ T1648] Workqueue: ipv6_addrconf addrconf_verify_work [ 721.483082][ T1648] Call Trace: [ 721.486382][ T1648] __schedule+0xa4d/0xf80 [ 721.492348][ T1648] ? release_firmware_map_entry+0x183/0x183 [ 721.499253][ T1648] ? _raw_spin_unlock_irq+0x1f/0x40 [ 721.504470][ T1648] ? lockdep_hardirqs_on+0x8d/0x130 [ 721.511144][ T1648] schedule+0x14b/0x200 [ 721.515348][ T1648] schedule_preempt_disabled+0xf/0x20 [ 721.522214][ T1648] __mutex_lock_common+0x11ef/0x2ef0 [ 721.528444][ T1648] ? addrconf_verify_work+0xa/0x20 [ 721.533580][ T1648] ? mutex_lock_io_nested+0x60/0x60 [ 721.540320][ T1648] ? rcu_read_lock_sched_held+0x87/0x110 [ 721.546021][ T1648] ? __bpf_trace_rcu_utilization+0x10/0x10 [ 721.553327][ T1648] ? _raw_spin_unlock_irq+0x1f/0x40 [ 721.559530][ T1648] mutex_lock_nested+0x1a/0x20 [ 721.564314][ T1648] addrconf_verify_work+0xa/0x20 [ 721.570704][ T1648] process_one_work+0x833/0x10c0 [ 721.575740][ T1648] ? rescuer_thread+0x16c0/0x16c0 [ 721.582269][ T1648] ? _raw_spin_lock_irqsave+0x100/0x100 [ 721.589003][ T1648] ? kthread_data+0x4d/0xc0 [ 721.593569][ T1648] ? wq_worker_running+0x8b/0x140 [ 721.601412][ T1648] worker_thread+0xaa4/0x1460 [ 721.606138][ T1648] ? rcu_lock_release+0x20/0x20 [ 721.612516][ T1648] kthread+0x39a/0x3c0 [ 721.616605][ T1648] ? rcu_lock_release+0x20/0x20 [ 721.623001][ T1648] ? kthread_blkcg+0xd0/0xd0 [ 721.628502][ T1648] ret_from_fork+0x1f/0x30 [ 721.633104][ T1648] [ 721.633104][ T1648] Showing all locks held in the system: [ 721.642452][ T1648] 1 lock held by khungtaskd/1648: [ 721.649414][ T1648] #0: ffffffff8c311580 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 [ 721.659875][ T1648] 1 lock held by in:imklog/8149: [ 721.664823][ T1648] #0: ffff88801887a870 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 [ 721.675761][ T1648] 3 locks held by kworker/1:0/8439: [ 721.682304][ T1648] #0: ffff888021579538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x7aa/0x10c0 [ 721.694304][ T1648] #1: ffffc9000170fd20 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x7e8/0x10c0 [ 721.705694][ T1648] #2: ffffffff8d2ee6c8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 721.716160][ T1648] 1 lock held by syz-executor594/8468: [ 721.722568][ T1648] [ 721.724912][ T1648] ============================================= [ 721.724912][ T1648] [ 721.736041][ T1648] NMI backtrace for cpu 1 [ 721.740488][ T1648] CPU: 1 PID: 1648 Comm: khungtaskd Not tainted 5.11.0-rc3-syzkaller #0 [ 721.748824][ T1648] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.758902][ T1648] Call Trace: [ 721.762181][ T1648] dump_stack+0x183/0x22e [ 721.766637][ T1648] ? log_buf_vmcoreinfo_setup+0x45d/0x45d [ 721.772414][ T1648] ? show_regs_print_info+0x12/0x12 [ 721.777618][ T1648] ? printk+0xc0/0x103 [ 721.781689][ T1648] ? log_buf_vmcoreinfo_setup+0x45d/0x45d [ 721.787414][ T1648] ? wake_up_klogd+0xb2/0xf0 [ 721.792007][ T1648] ? asan.module_ctor+0x20/0x20 [ 721.796895][ T1648] nmi_cpu_backtrace+0x16c/0x190 [ 721.801835][ T1648] ? arch_trigger_cpumask_backtrace+0x10/0x10 [ 721.807922][ T1648] nmi_trigger_cpumask_backtrace+0x191/0x2f0 [ 721.813917][ T1648] ? arch_trigger_cpumask_backtrace+0x10/0x10 [ 721.819989][ T1648] watchdog+0xce9/0xd30 [ 721.824245][ T1648] ? hungtask_pm_notify+0x50/0x50 [ 721.829269][ T1648] kthread+0x39a/0x3c0 [ 721.833340][ T1648] ? hungtask_pm_notify+0x50/0x50 [ 721.838364][ T1648] ? kthread_blkcg+0xd0/0xd0 [ 721.842965][ T1648] ret_from_fork+0x1f/0x30 [ 721.847644][ T1648] Sending NMI from CPU 1 to CPUs 0: [ 721.853002][ C0] NMI backtrace for cpu 0 [ 721.853009][ C0] CPU: 0 PID: 4882 Comm: systemd-journal Not tainted 5.11.0-rc3-syzkaller #0 [ 721.853015][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.853020][ C0] RIP: 0033:0x7f04b09c2115 [ 721.853025][ C0] Code: 48 83 c4 48 ff 20 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 64 48 8b 14 25 08 00 00 00 48 8b 05 90 de 20 00 48 39 02 75 16 <48> 8b 07 48 c1 e0 04 48 8b 04 02 48 83 f8 ff 74 05 48 03 47 08 c3 [ 721.853033][ C0] RSP: 002b:00007fff678b0f68 EFLAGS: 00000246 [ 721.853043][ C0] RAX: 0000000000000001 RBX: 0000000000000065 RCX: 00000000000000f0 [ 721.853048][ C0] RDX: 00007f04b0bc01d0 RSI: 0000000000000000 RDI: 00007f04b09a5758 [ 721.853053][ C0] RBP: 0000000000000001 R08: 0000000000800000 R09: 0000000000000000 [ 721.853057][ C0] R10: 70f397d154649920 R11: 9b712297408b4206 R12: 000055baeedfae80 [ 721.853062][ C0] R13: 00007fff678b10b0 R14: 00007fff678b10a8 R15: 00000000002567c0 [ 721.853067][ C0] FS: 00007f04b0bbf8c0 GS: 0000000000000000 [ 721.854233][ T1648] Kernel panic - not syncing: hung_task: blocked tasks [ 721.959539][ T1648] CPU: 1 PID: 1648 Comm: khungtaskd Not tainted 5.11.0-rc3-syzkaller #0 [ 721.967868][ T1648] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.977923][ T1648] Call Trace: [ 721.981209][ T1648] dump_stack+0x183/0x22e [ 721.985549][ T1648] ? log_buf_vmcoreinfo_setup+0x45d/0x45d [ 721.991275][ T1648] ? show_regs_print_info+0x12/0x12 [ 721.996489][ T1648] panic+0x2e1/0x850 [ 722.000491][ T1648] ? nmi_trigger_cpumask_backtrace+0x236/0x2f0 [ 722.006649][ T1648] ? nmi_panic+0x90/0x90 [ 722.010897][ T1648] ? preempt_schedule_thunk+0x16/0x18 [ 722.016277][ T1648] ? nmi_trigger_cpumask_backtrace+0x236/0x2f0 [ 722.022454][ T1648] ? nmi_trigger_cpumask_backtrace+0x29b/0x2f0 [ 722.028613][ T1648] ? nmi_trigger_cpumask_backtrace+0x2a0/0x2f0 [ 722.034769][ T1648] ? arch_trigger_cpumask_backtrace+0x10/0x10 [ 722.040850][ T1648] watchdog+0xd29/0xd30 [ 722.045024][ T1648] ? hungtask_pm_notify+0x50/0x50 [ 722.050049][ T1648] kthread+0x39a/0x3c0 [ 722.054121][ T1648] ? hungtask_pm_notify+0x50/0x50 [ 722.059145][ T1648] ? kthread_blkcg+0xd0/0xd0 [ 722.063745][ T1648] ret_from_fork+0x1f/0x30 [ 722.068838][ T1648] Kernel Offset: disabled [ 722.073198][ T1648] Rebooting in 86400 seconds..