[ OK ] Reached target Multi-User System. [ 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... Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.151' (ECDSA) to the list of known hosts. syzkaller login: [ 351.744447][ T8489] IPVS: ftp: loaded support on port[0] = 21 [ 351.839874][ T21] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 351.858057][ T21] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 351.879989][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready executing program [ 351.900962][ T226] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 351.909627][ T226] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 351.919304][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready [ 514.733281][ T1655] INFO: task kworker/0:1:7 blocked for more than 143 seconds. [ 514.740945][ T1655] Not tainted 5.10.0-rc4-syzkaller #0 [ 514.748517][ T1655] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 514.757902][ T1655] task:kworker/0:1 state:D stack:27200 pid: 7 ppid: 2 flags:0x00004000 [ 514.767985][ T1655] Workqueue: ipv6_addrconf addrconf_dad_work [ 514.774697][ T1655] Call Trace: [ 514.778057][ T1655] __schedule+0x893/0x2130 [ 514.782483][ T1655] ? io_schedule_timeout+0x140/0x140 [ 514.789274][ T1655] ? _raw_spin_unlock_irq+0x1f/0x40 [ 514.795184][ T1655] ? lockdep_hardirqs_on+0x79/0x100 [ 514.800398][ T1655] schedule+0xcf/0x270 [ 514.805486][ T1655] schedule_preempt_disabled+0xf/0x20 [ 514.811392][ T1655] __mutex_lock+0x3e2/0x10e0 [ 514.817165][ T1655] ? addrconf_dad_work+0xa3/0x1280 [ 514.822296][ T1655] ? mutex_lock_io_nested+0xf60/0xf60 [ 514.829050][ T1655] ? debug_object_deactivate+0x264/0x300 [ 514.835526][ T1655] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 514.841554][ T1655] addrconf_dad_work+0xa3/0x1280 [ 514.847707][ T1655] ? addrconf_dad_completed+0xc60/0xc60 [ 514.855334][ T1655] process_one_work+0x933/0x15a0 [ 514.860296][ T1655] ? lock_release+0x710/0x710 [ 514.866575][ T1655] ? pwq_dec_nr_in_flight+0x320/0x320 [ 514.871979][ T1655] ? rwlock_bug.part.0+0x90/0x90 [ 514.877981][ T1655] ? _raw_spin_lock_irq+0x41/0x50 [ 514.883026][ T1655] worker_thread+0x64c/0x1120 [ 514.888715][ T1655] ? process_one_work+0x15a0/0x15a0 [ 514.894842][ T1655] kthread+0x3af/0x4a0 [ 514.898932][ T1655] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 514.905990][ T1655] ret_from_fork+0x1f/0x30 [ 514.911202][ T1655] [ 514.911202][ T1655] Showing all locks held in the system: [ 514.920108][ T1655] 3 locks held by kworker/0:1/7: [ 514.926661][ T1655] #0: ffff888147200d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 [ 514.938484][ T1655] #1: ffffc90000cc7da8 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 [ 514.951400][ T1655] #2: ffffffff8c9286c8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xa3/0x1280 [ 514.961615][ T1655] 1 lock held by khungtaskd/1655: [ 514.967351][ T1655] #0: ffffffff8b337820 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 514.978021][ T1655] 3 locks held by kworker/1:2/3001: [ 514.985064][ T1655] #0: ffff888147200d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 [ 514.996724][ T1655] #1: ffffc90001affda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 [ 515.007857][ T1655] #2: ffffffff8c9286c8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 515.018567][ T1655] 1 lock held by in:imklog/8168: [ 515.024290][ T1655] #0: ffff888024621770 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 515.034129][ T1655] 2 locks held by syz-executor181/8530: [ 515.039698][ T1655] [ 515.042020][ T1655] ============================================= [ 515.042020][ T1655] [ 515.051962][ T1655] NMI backtrace for cpu 0 [ 515.056419][ T1655] CPU: 0 PID: 1655 Comm: khungtaskd Not tainted 5.10.0-rc4-syzkaller #0 [ 515.064734][ T1655] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 515.074782][ T1655] Call Trace: [ 515.078117][ T1655] dump_stack+0x107/0x163 [ 515.082450][ T1655] nmi_cpu_backtrace.cold+0x44/0xd7 [ 515.087757][ T1655] ? lapic_can_unplug_cpu+0x80/0x80 [ 515.092988][ T1655] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 515.099010][ T1655] watchdog+0xd43/0xfa0 [ 515.103173][ T1655] ? reset_hung_task_detector+0x30/0x30 [ 515.108717][ T1655] kthread+0x3af/0x4a0 [ 515.112781][ T1655] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 515.118675][ T1655] ret_from_fork+0x1f/0x30 [ 515.123392][ T1655] Sending NMI from CPU 0 to CPUs 1: [ 515.130050][ C1] NMI backtrace for cpu 1 [ 515.130057][ C1] CPU: 1 PID: 8530 Comm: syz-executor181 Not tainted 5.10.0-rc4-syzkaller #0 [ 515.130063][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 515.130067][ C1] RIP: 0010:debug_lockdep_rcu_enabled+0x23/0x30 [ 515.130077][ C1] Code: cc cc cc cc cc cc cc 8b 05 ea 0e 07 04 85 c0 74 21 8b 05 bc 3f 07 04 85 c0 74 17 65 48 8b 04 25 00 f0 01 00 8b 80 0c 09 00 00 <85> c0 0f 94 c0 0f b6 c0 c3 cc cc cc cc 55 53 48 c7 c3 40 57 03 00 [ 515.130081][ C1] RSP: 0018:ffffc9000169eb98 EFLAGS: 00000202 [ 515.130090][ C1] RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff81564511 [ 515.130094][ C1] RDX: fffffbfff19d973a RSI: 0000000000000008 RDI: ffffffff8cecb9c8 [ 515.130099][ C1] RBP: 1ffff920002d3d78 R08: 0000000000000000 R09: ffffffff8cecb9cf [ 515.130104][ C1] R10: fffffbfff19d9739 R11: 0000000000000000 R12: 0000000000000001 [ 515.130109][ C1] R13: 0000000000000001 R14: 1ffff920002d3d93 R15: ffff888140e2e000 [ 515.130114][ C1] FS: 0000000000000000(0000) GS:ffff8880b9f00000(0063) knlGS:0000000008314840 [ 515.130118][ C1] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 515.130123][ C1] CR2: 00007f56a2a73000 CR3: 0000000021b3c000 CR4: 00000000001506e0 [ 515.130127][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 515.130132][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 515.130135][ C1] Call Trace: [ 515.130139][ C1] rcu_read_lock_sched_held+0xd/0x70 [ 515.130142][ C1] lock_release+0x5b7/0x710 [ 515.130146][ C1] ? tcf_idr_check_alloc+0x29e/0x3b0 [ 515.130149][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 515.130153][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 515.130157][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 515.130160][ C1] __mutex_unlock_slowpath+0x81/0x610 [ 515.130164][ C1] ? wait_for_completion+0x260/0x260 [ 515.130167][ C1] tcf_idr_check_alloc+0x29e/0x3b0 [ 515.130171][ C1] tcf_police_init+0x347/0x13a0 [ 515.130174][ C1] ? tcf_police_cleanup+0x60/0x60 [ 515.130178][ C1] ? find_held_lock+0x2d/0x110 [ 515.130181][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 515.130185][ C1] ? stack_trace_consume_entry+0x160/0x160 [ 515.130189][ C1] tcf_action_init_1+0x1a3/0x990 [ 515.130192][ C1] ? tcf_action_dump_old+0x80/0x80 [ 515.130196][ C1] ? ___sys_sendmsg+0xf3/0x170 [ 515.130199][ C1] ? __sys_sendmmsg+0x292/0x470 [ 515.130203][ C1] ? __ia32_compat_sys_sendmmsg+0x9b/0x100 [ 515.130207][ C1] ? __do_fast_syscall_32+0x56/0x80 [ 515.130210][ C1] ? do_fast_syscall_32+0x2f/0x70 [ 515.130215][ C1] ? entry_SYSENTER_compat_after_hwframe+0x4d/0x5c [ 515.130218][ C1] ? find_held_lock+0x2d/0x110 [ 515.130222][ C1] tcf_exts_validate+0x138/0x420 [ 515.130225][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 515.130229][ C1] ? kasan_unpoison_shadow+0x33/0x40 [ 515.130232][ C1] rsvp_change+0x291/0x27a0 [ 515.130235][ C1] ? find_held_lock+0x2d/0x110 [ 515.130239][ C1] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 515.130242][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 515.130246][ C1] ? blackhole_dequeue+0x10/0x10 [ 515.130249][ C1] tc_new_tfilter+0x1398/0x2130 [ 515.130253][ C1] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 515.130257][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 515.130260][ C1] ? kernel_text_address+0xbd/0xf0 [ 515.130264][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 515.130267][ C1] rtnetlink_rcv_msg+0x80e/0xad0 [ 515.130271][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 515.130274][ C1] netlink_rcv_skb+0x153/0x420 [ 515.130278][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 515.130281][ C1] ? netlink_ack+0xaa0/0xaa0 [ 515.130285][ C1] ? netlink_deliver_tap+0x227/0xb70 [ 515.130288][ C1] netlink_unicast+0x533/0x7d0 [ 515.130292][ C1] ? netlink_attachskb+0x810/0x810 [ 515.130296][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 515.130299][ C1] ? __check_object_size+0x171/0x3f0 [ 515.130303][ C1] netlink_sendmsg+0x856/0xd90 [ 515.130306][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 515.130310][ C1] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 515.130314][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 515.130317][ C1] sock_sendmsg+0xcf/0x120 [ 515.130320][ C1] ____sys_sendmsg+0x331/0x810 [ 515.130324][ C1] ? kernel_sendmsg+0x50/0x50 [ 515.130327][ C1] ? do_recvmmsg+0x6c0/0x6c0 [ 515.130330][ C1] ? rcu_read_lock_sched_held+0x3a/0x70 [ 515.130334][ C1] ? kfree+0x2d3/0x360 [ 515.130337][ C1] ? mark_lock+0xf7/0x24c0 [ 515.130340][ C1] ___sys_sendmsg+0xf3/0x170 [ 515.130344][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 515.130347][ C1] ? find_held_lock+0x2d/0x110 [ 515.130351][ C1] ? fs_reclaim_release+0x90/0xd0 [ 515.130354][ C1] ? __lock_acquire+0xbe0/0x5c00 [ 515.130358][ C1] __sys_sendmmsg+0x292/0x470 [ 515.130362][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 515.130366][ C1] ? find_held_lock+0x2d/0x110 [ 515.130369][ C1] ? alloc_file_pseudo+0x1/0x250 [ 515.130373][ C1] ? __fd_install+0x1e6/0x600 [ 515.130376][ C1] ? __sys_socket+0x16d/0x200 [ 515.130380][ C1] __ia32_compat_sys_sendmmsg+0x9b/0x100 [ 515.130383][ C1] ? lockdep_hardirqs_on+0x79/0x100 [ 515.130387][ C1] __do_fast_syscall_32+0x56/0x80 [ 515.130390][ C1] do_fast_syscall_32+0x2f/0x70 [ 515.130394][ C1] entry_SYSENTER_compat_after_hwframe+0x4d/0x5c [ 515.130397][ C1] RIP: 0023:0xf7fb6549 [ 515.130407][ C1] Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 515.130411][ C1] RSP: 002b:00000000ff8946ec EFLAGS: 00000296 ORIG_RAX: 0000000000000159 [ 515.130420][ C1] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000020000200 [ 515.130425][ C1] RDX: 00000000924926d3 RSI: 0000000000000000 RDI: 0000000000000010 [ 515.130430][ C1] RBP: 0000000000080002 R08: 0000000000000000 R09: 0000000000000000 [ 515.130434][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 515.130439][ C1] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 515.130445][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.375 msecs [ 515.132022][ T1655] Kernel panic - not syncing: hung_task: blocked tasks [ 515.721333][ T1655] CPU: 0 PID: 1655 Comm: khungtaskd Not tainted 5.10.0-rc4-syzkaller #0 [ 515.729650][ T1655] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 515.739701][ T1655] Call Trace: [ 515.742995][ T1655] dump_stack+0x107/0x163 [ 515.747358][ T1655] panic+0x306/0x73d [ 515.751255][ T1655] ? __warn_printk+0xf3/0xf3 [ 515.755848][ T1655] ? lapic_can_unplug_cpu+0x80/0x80 [ 515.761045][ T1655] ? preempt_schedule_thunk+0x16/0x18 [ 515.766541][ T1655] ? watchdog.cold+0x5/0x158 [ 515.771126][ T1655] ? watchdog+0xa80/0xfa0 [ 515.775468][ T1655] watchdog.cold+0x16/0x158 [ 515.779974][ T1655] ? reset_hung_task_detector+0x30/0x30 [ 515.785522][ T1655] kthread+0x3af/0x4a0 [ 515.789605][ T1655] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 515.795496][ T1655] ret_from_fork+0x1f/0x30 [ 515.800117][ T1655] Kernel Offset: disabled [ 515.804451][ T1655] Rebooting in 86400 seconds..