[ 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 '10.128.1.62' (ECDSA) to the list of known hosts. syzkaller login: [ 826.112984][ T6875] IPVS: ftp: loaded support on port[0] = 21 [ 826.180154][ T136] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 826.192811][ T136] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 826.227502][ T29] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 826.245740][ T6884] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 826.262436][ T6884] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 executing program [ 826.272399][ T6867] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready [ 826.298998][ T6918] netlink: 32 bytes leftover after parsing attributes in process `syz-executor019'. [ 984.999705][ T1172] INFO: task kworker/1:1:29 blocked for more than 143 seconds. [ 985.007401][ T1172] Not tainted 5.9.0-rc6-syzkaller #0 [ 985.015849][ T1172] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 985.025231][ T1172] task:kworker/1:1 state:D stack:27536 pid: 29 ppid: 2 flags:0x00004000 [ 985.035320][ T1172] Workqueue: ipv6_addrconf addrconf_dad_work [ 985.042121][ T1172] Call Trace: [ 985.045572][ T1172] __schedule+0xec9/0x2280 [ 985.051167][ T1172] ? io_schedule_timeout+0x140/0x140 [ 985.056609][ T1172] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 985.064152][ T1172] ? _raw_spin_unlock_irq+0x1f/0x80 [ 985.069401][ T1172] ? lockdep_hardirqs_on+0x53/0x100 [ 985.077362][ T1172] schedule+0xd0/0x2a0 [ 985.082224][ T1172] schedule_preempt_disabled+0xf/0x20 [ 985.087616][ T1172] __mutex_lock+0x3e2/0x10e0 [ 985.093390][ T1172] ? addrconf_dad_work+0xa3/0x1280 [ 985.098523][ T1172] ? mutex_lock_io_nested+0xf60/0xf60 [ 985.105397][ T1172] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 985.112072][ T1172] ? lock_acquire+0x1f3/0xaf0 [ 985.116939][ T1172] ? process_one_work+0x85f/0x1670 [ 985.123164][ T1172] addrconf_dad_work+0xa3/0x1280 [ 985.128116][ T1172] ? addrconf_dad_completed+0xcd0/0xcd0 [ 985.135802][ T1172] ? _raw_spin_unlock_irq+0x1f/0x80 [ 985.141712][ T1172] ? lock_is_held_type+0xbb/0xf0 [ 985.146687][ T1172] process_one_work+0x94c/0x1670 [ 985.152648][ T1172] ? lock_release+0x8f0/0x8f0 [ 985.157338][ T1172] ? pwq_dec_nr_in_flight+0x320/0x320 [ 985.163790][ T1172] ? rwlock_bug.part.0+0x90/0x90 [ 985.168895][ T1172] ? lockdep_hardirqs_off+0x96/0xd0 [ 985.175567][ T1172] worker_thread+0x64c/0x1120 [ 985.180937][ T1172] ? process_one_work+0x1670/0x1670 [ 985.186210][ T1172] kthread+0x3b5/0x4a0 [ 985.191350][ T1172] ? __kthread_bind_mask+0xc0/0xc0 [ 985.196590][ T1172] ret_from_fork+0x1f/0x30 [ 985.203349][ T1172] INFO: task kworker/0:0:6867 blocked for more than 143 seconds. [ 985.211839][ T1172] Not tainted 5.9.0-rc6-syzkaller #0 [ 985.217732][ T1172] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 985.228047][ T1172] task:kworker/0:0 state:D stack:28160 pid: 6867 ppid: 2 flags:0x00004000 [ 985.237914][ T1172] Workqueue: ipv6_addrconf addrconf_dad_work [ 985.244731][ T1172] Call Trace: [ 985.248050][ T1172] __schedule+0xec9/0x2280 [ 985.253537][ T1172] ? io_schedule_timeout+0x140/0x140 [ 985.258837][ T1172] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 985.266078][ T1172] ? _raw_spin_unlock_irq+0x1f/0x80 [ 985.272155][ T1172] ? lockdep_hardirqs_on+0x53/0x100 [ 985.277368][ T1172] schedule+0xd0/0x2a0 [ 985.282474][ T1172] schedule_preempt_disabled+0xf/0x20 [ 985.287882][ T1172] __mutex_lock+0x3e2/0x10e0 [ 985.293517][ T1172] ? addrconf_dad_work+0xa3/0x1280 [ 985.298647][ T1172] ? mutex_lock_io_nested+0xf60/0xf60 [ 985.305556][ T1172] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 985.312317][ T1172] ? lock_acquire+0x1f3/0xaf0 [ 985.317003][ T1172] ? process_one_work+0x85f/0x1670 [ 985.323188][ T1172] addrconf_dad_work+0xa3/0x1280 [ 985.328142][ T1172] ? addrconf_dad_completed+0xcd0/0xcd0 [ 985.335854][ T1172] ? _raw_spin_unlock_irq+0x1f/0x80 [ 985.341711][ T1172] ? lock_is_held_type+0xbb/0xf0 [ 985.346676][ T1172] process_one_work+0x94c/0x1670 [ 985.353749][ T1172] ? lock_release+0x8f0/0x8f0 [ 985.358455][ T1172] ? pwq_dec_nr_in_flight+0x320/0x320 [ 985.364832][ T1172] ? rwlock_bug.part.0+0x90/0x90 [ 985.370571][ T1172] ? lockdep_hardirqs_off+0x96/0xd0 [ 985.375815][ T1172] worker_thread+0x64c/0x1120 [ 985.381542][ T1172] ? __kthread_parkme+0x13f/0x1e0 [ 985.386584][ T1172] ? process_one_work+0x1670/0x1670 [ 985.392807][ T1172] kthread+0x3b5/0x4a0 [ 985.396886][ T1172] ? __kthread_bind_mask+0xc0/0xc0 [ 985.403107][ T1172] ret_from_fork+0x1f/0x30 [ 985.407579][ T1172] INFO: task syz-executor019:6918 blocked for more than 143 seconds. [ 985.416714][ T1172] Not tainted 5.9.0-rc6-syzkaller #0 [ 985.423159][ T1172] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 985.432720][ T1172] task:syz-executor019 state:D stack:25816 pid: 6918 ppid: 6875 flags:0x00004004 [ 985.443546][ T1172] Call Trace: [ 985.446937][ T1172] __schedule+0xec9/0x2280 [ 985.452366][ T1172] ? io_schedule_timeout+0x140/0x140 [ 985.457670][ T1172] schedule+0xd0/0x2a0 [ 985.463955][ T1172] schedule_preempt_disabled+0xf/0x20 [ 985.469349][ T1172] __mutex_lock+0x3e2/0x10e0 [ 985.475360][ T1172] ? tcf_action_init_1+0x747/0x990 [ 985.481138][ T1172] ? mutex_lock_io_nested+0xf60/0xf60 [ 985.486538][ T1172] ? lock_downgrade+0x830/0x830 [ 985.492525][ T1172] ? generic_xdp_install+0x700/0x700 [ 985.497843][ T1172] tcf_action_init_1+0x747/0x990 [ 985.503864][ T1172] ? tcf_action_dump_old+0x80/0x80 [ 985.508987][ T1172] ? find_held_lock+0x2d/0x110 [ 985.514863][ T1172] tcf_action_init+0x265/0x4b0 [ 985.520402][ T1172] ? tcf_action_init_1+0x990/0x990 [ 985.525591][ T1172] tcf_action_add+0xd9/0x360 [ 985.531444][ T1172] ? tca_action_gd+0xe20/0xe20 [ 985.536218][ T1172] ? lock_acquire+0x1f3/0xaf0 [ 985.542050][ T1172] ? bpf_lsm_capable+0x5/0x10 [ 985.546814][ T1172] ? __nla_parse+0x3d/0x4a [ 985.552246][ T1172] tc_ctl_action+0x33a/0x439 [ 985.556851][ T1172] ? tcf_action_add+0x360/0x360 [ 985.563102][ T1172] ? lock_is_held_type+0xbb/0xf0 [ 985.568067][ T1172] ? tcf_action_add+0x360/0x360 [ 985.575397][ T1172] rtnetlink_rcv_msg+0x44e/0xad0 [ 985.580943][ T1172] ? rtnetlink_put_metrics+0x510/0x510 [ 985.586431][ T1172] ? lock_acquire+0x1f3/0xaf0 [ 985.593368][ T1172] ? netlink_deliver_tap+0x146/0xb70 [ 985.598674][ T1172] netlink_rcv_skb+0x15a/0x430 [ 985.604479][ T1172] ? rtnetlink_put_metrics+0x510/0x510 [ 985.610549][ T1172] ? netlink_ack+0xa10/0xa10 [ 985.615365][ T1172] ? __kmalloc_node_track_caller+0x38/0x60 [ 985.622225][ T1172] netlink_unicast+0x533/0x7d0 [ 985.627015][ T1172] ? netlink_attachskb+0x810/0x810 [ 985.633516][ T1172] ? __phys_addr_symbol+0x2c/0x70 [ 985.638614][ T1172] ? __check_object_size+0x171/0x3e4 [ 985.645046][ T1172] netlink_sendmsg+0x856/0xd90 [ 985.650433][ T1172] ? netlink_unicast+0x7d0/0x7d0 [ 985.655449][ T1172] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 985.661858][ T1172] ? netlink_unicast+0x7d0/0x7d0 [ 985.667394][ T1172] sock_sendmsg+0xcf/0x120 [ 985.672853][ T1172] ____sys_sendmsg+0x6e8/0x810 [ 985.677774][ T1172] ? kernel_sendmsg+0x50/0x50 [ 985.683563][ T1172] ? do_recvmmsg+0x6d0/0x6d0 [ 985.688348][ T1172] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 985.695360][ T1172] ? lock_is_held_type+0xbb/0xf0 [ 985.700945][ T1172] ? find_held_lock+0x2d/0x110 [ 985.705817][ T1172] ___sys_sendmsg+0xf3/0x170 [ 985.711454][ T1172] ? sendmsg_copy_msghdr+0x160/0x160 [ 985.717022][ T1172] ? __fget_files+0x272/0x400 [ 985.723897][ T1172] ? lock_downgrade+0x830/0x830 [ 985.728824][ T1172] ? do_huge_pmd_anonymous_page+0x8f2/0x2200 [ 985.735876][ T1172] ? __fget_files+0x294/0x400 [ 985.741194][ T1172] ? __fget_light+0xea/0x280 [ 985.745802][ T1172] __sys_sendmsg+0xe5/0x1b0 [ 985.751325][ T1172] ? __sys_sendmsg_sock+0xb0/0xb0 [ 985.756379][ T1172] ? check_preemption_disabled+0x50/0x130 [ 985.763177][ T1172] ? syscall_enter_from_user_mode+0x1d/0x60 [ 985.769165][ T1172] do_syscall_64+0x2d/0x70 [ 985.774902][ T1172] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 985.782535][ T1172] RIP: 0033:0x448189 [ 985.786431][ T1172] Code: Bad RIP value. [ 985.791644][ T1172] RSP: 002b:00007f64bac32d98 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 985.800729][ T1172] RAX: ffffffffffffffda RBX: 00000000006e39e8 RCX: 0000000000448189 [ 985.808706][ T1172] RDX: 0000000000000000 RSI: 0000000020002980 RDI: 0000000000000003 [ 985.817808][ T1172] RBP: 00000000006e39e0 R08: 0000000000000000 R09: 0000000000000000 [ 985.826471][ T1172] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006e39ec [ 985.835156][ T1172] R13: 0001008400000000 R14: 0000000000000000 R15: 053b003000000098 [ 985.843797][ T1172] [ 985.843797][ T1172] Showing all locks held in the system: [ 985.853324][ T1172] 3 locks held by kworker/1:1/29: [ 985.862411][ T1172] #0: ffff888214dda538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 985.874177][ T1172] #1: ffffc90000e37da8 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 985.887188][ T1172] #2: ffffffff8b14d548 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xa3/0x1280 [ 985.897272][ T1172] 1 lock held by khungtaskd/1172: [ 985.902957][ T1172] #0: ffffffff8a067f00 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 985.914169][ T1172] 1 lock held by in:imklog/6555: [ 985.919384][ T1172] #0: ffff888097ae9d70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 985.929616][ T1172] 3 locks held by kworker/0:0/6867: [ 985.934813][ T1172] #0: ffff888214dda538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 985.946908][ T1172] #1: ffffc900051efda8 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 985.959774][ T1172] #2: ffffffff8b14d548 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xa3/0x1280 [ 985.970357][ T1172] 1 lock held by syz-executor019/6918: [ 985.975820][ T1172] #0: ffffffff8b14d548 (rtnl_mutex){+.+.}-{3:3}, at: tcf_action_init_1+0x747/0x990 [ 985.987850][ T1172] 2 locks held by syz-executor019/6920: [ 985.994127][ T1172] [ 985.996485][ T1172] ============================================= [ 985.996485][ T1172] [ 986.010419][ T1172] NMI backtrace for cpu 1 [ 986.014765][ T1172] CPU: 1 PID: 1172 Comm: khungtaskd Not tainted 5.9.0-rc6-syzkaller #0 [ 986.023075][ T1172] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 986.033122][ T1172] Call Trace: [ 986.036477][ T1172] dump_stack+0x198/0x1fd [ 986.040810][ T1172] nmi_cpu_backtrace.cold+0x70/0xb1 [ 986.046142][ T1172] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 986.051795][ T1172] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 986.058344][ T1172] watchdog+0xd7d/0x1000 [ 986.062595][ T1172] ? reset_hung_task_detector+0x30/0x30 [ 986.068156][ T1172] kthread+0x3b5/0x4a0 [ 986.072239][ T1172] ? __kthread_bind_mask+0xc0/0xc0 [ 986.077380][ T1172] ret_from_fork+0x1f/0x30 [ 986.081891][ T1172] Sending NMI from CPU 1 to CPUs 0: [ 986.088214][ C0] NMI backtrace for cpu 0 [ 986.088220][ C0] CPU: 0 PID: 6920 Comm: syz-executor019 Not tainted 5.9.0-rc6-syzkaller #0 [ 986.088225][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 986.088229][ C0] RIP: 0010:rcu_lockdep_current_cpu_online+0xd4/0x120 [ 986.088239][ C0] Code: 5b 20 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 49 48 8b 45 70 48 85 c3 0f 95 c0 65 ff 0d 1c 30 9f 7e <74> 03 5b 5d c3 e8 d1 aa 9d ff eb f6 48 89 ee 48 c7 c7 40 ef 06 8a [ 986.088242][ C0] RSP: 0018:ffffc90005526d68 EFLAGS: 00000282 [ 986.088249][ C0] RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff815c000f [ 986.088253][ C0] RDX: 1ffffffff140df56 RSI: 0000000000000002 RDI: ffffffff8a06fab0 [ 986.088258][ C0] RBP: ffffffff8a06fa40 R08: 0000000000000000 R09: ffffffff8b59654f [ 986.088262][ C0] R10: fffffbfff16b2ca9 R11: 0000000000000000 R12: 0000000000000001 [ 986.088267][ C0] R13: ffff88809e939e68 R14: ffffffff868a961e R15: ffff88809e939e00 [ 986.088272][ C0] FS: 00007f64bac12700(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000 [ 986.088275][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 986.088280][ C0] CR2: 0000561d9be49d10 CR3: 00000000a8d86000 CR4: 00000000001506f0 [ 986.088284][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 986.088289][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 986.088291][ C0] Call Trace: [ 986.088295][ C0] rcu_read_lock_sched_held+0x25/0xb0 [ 986.088297][ C0] lock_release+0x6a1/0x8f0 [ 986.088300][ C0] ? __mutex_lock+0x626/0x10e0 [ 986.088303][ C0] ? lock_downgrade+0x830/0x830 [ 986.088307][ C0] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 986.088310][ C0] ? tcf_idr_check_alloc+0x78/0x3b0 [ 986.088313][ C0] ? lockdep_hardirqs_on+0x53/0x100 [ 986.088317][ C0] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 986.088320][ C0] ? mutex_lock_io_nested+0xf60/0xf60 [ 986.088323][ C0] __mutex_unlock_slowpath+0x81/0x610 [ 986.088326][ C0] ? __radix_tree_lookup+0xa2/0x290 [ 986.088330][ C0] ? wait_for_completion+0x260/0x260 [ 986.088333][ C0] tcf_idr_check_alloc+0x29e/0x3b0 [ 986.088336][ C0] tcf_connmark_init+0x2de/0x910 [ 986.088339][ C0] ? tcf_connmark_act+0xb40/0xb40 [ 986.088342][ C0] ? lock_downgrade+0x830/0x830 [ 986.088345][ C0] ? __kmalloc_track_caller+0x38/0x360 [ 986.088348][ C0] tcf_action_init_1+0x63f/0x990 [ 986.088351][ C0] ? tcf_action_dump_old+0x80/0x80 [ 986.088354][ C0] tcf_action_init+0x265/0x4b0 [ 986.088357][ C0] ? tcf_action_init_1+0x990/0x990 [ 986.088360][ C0] ? __lock_acquire+0xb92/0x5780 [ 986.088363][ C0] tcf_action_add+0xd9/0x360 [ 986.088366][ C0] ? tca_action_gd+0xe20/0xe20 [ 986.088369][ C0] ? lock_acquire+0x1f3/0xaf0 [ 986.088372][ C0] ? bpf_lsm_capable+0x5/0x10 [ 986.088374][ C0] ? __nla_parse+0x3d/0x4a [ 986.088377][ C0] tc_ctl_action+0x33a/0x439 [ 986.088380][ C0] ? tcf_action_add+0x360/0x360 [ 986.088383][ C0] ? lock_is_held_type+0xbb/0xf0 [ 986.088386][ C0] ? tcf_action_add+0x360/0x360 [ 986.088389][ C0] rtnetlink_rcv_msg+0x44e/0xad0 [ 986.088392][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 986.088395][ C0] ? lock_acquire+0x1f3/0xaf0 [ 986.088398][ C0] ? netlink_deliver_tap+0x146/0xb70 [ 986.088401][ C0] netlink_rcv_skb+0x15a/0x430 [ 986.088404][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 986.088407][ C0] ? netlink_ack+0xa10/0xa10 [ 986.088411][ C0] ? __kmalloc_node_track_caller+0x38/0x60 [ 986.088414][ C0] netlink_unicast+0x533/0x7d0 [ 986.088418][ C0] ? netlink_attachskb+0x810/0x810 [ 986.088421][ C0] ? __phys_addr_symbol+0x2c/0x70 [ 986.088424][ C0] ? __check_object_size+0x171/0x3e4 [ 986.088427][ C0] netlink_sendmsg+0x856/0xd90 [ 986.088430][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 986.088433][ C0] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 986.088436][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 986.088439][ C0] sock_sendmsg+0xcf/0x120 [ 986.088442][ C0] ____sys_sendmsg+0x6e8/0x810 [ 986.088445][ C0] ? kernel_sendmsg+0x50/0x50 [ 986.088447][ C0] ? do_recvmmsg+0x6d0/0x6d0 [ 986.088451][ C0] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 986.088454][ C0] ? __lock_acquire+0xb92/0x5780 [ 986.088457][ C0] ___sys_sendmsg+0xf3/0x170 [ 986.088460][ C0] ? sendmsg_copy_msghdr+0x160/0x160 [ 986.088463][ C0] ? __fget_files+0x272/0x400 [ 986.088466][ C0] ? lock_downgrade+0x830/0x830 [ 986.088469][ C0] ? percpu_counter_add_batch+0x126/0x180 [ 986.088472][ C0] ? __fget_files+0x294/0x400 [ 986.088475][ C0] ? __fget_light+0xea/0x280 [ 986.088477][ C0] __sys_sendmsg+0xe5/0x1b0 [ 986.088480][ C0] ? __sys_sendmsg_sock+0xb0/0xb0 [ 986.088483][ C0] ? __x64_sys_futex+0x382/0x4e0 [ 986.088487][ C0] ? check_preemption_disabled+0x50/0x130 [ 986.088490][ C0] ? syscall_enter_from_user_mode+0x1d/0x60 [ 986.088493][ C0] do_syscall_64+0x2d/0x70 [ 986.088497][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 986.088499][ C0] RIP: 0033:0x448189 [ 986.088509][ C0] Code: e8 5c 08 03 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb 05 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 986.088512][ C0] RSP: 002b:00007f64bac11d98 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 986.088520][ C0] RAX: ffffffffffffffda RBX: 00000000006e39f8 RCX: 0000000000448189 [ 986.088524][ C0] RDX: 0000000000000000 RSI: 0000000020002980 RDI: 0000000000000004 [ 986.088529][ C0] RBP: 00000000006e39f0 R08: 000000000000000d R09: 0000000000000000 [ 986.088533][ C0] R10: 0000000000000050 R11: 0000000000000246 R12: 00000000006e39fc [ 986.088538][ C0] R13: 0001008400000000 R14: 0000000000000000 R15: 053b003000000098 [ 986.109515][ T1172] Kernel panic - not syncing: hung_task: blocked tasks [ 986.652433][ T1172] CPU: 1 PID: 1172 Comm: khungtaskd Not tainted 5.9.0-rc6-syzkaller #0 [ 986.660666][ T1172] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 986.670719][ T1172] Call Trace: [ 986.674204][ T1172] dump_stack+0x198/0x1fd [ 986.678653][ T1172] panic+0x382/0x7fb [ 986.682550][ T1172] ? __warn_printk+0xf3/0xf3 [ 986.687162][ T1172] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 986.692873][ T1172] ? preempt_schedule_thunk+0x16/0x18 [ 986.698239][ T1172] ? watchdog.cold+0x5/0x16b [ 986.702838][ T1172] ? watchdog+0xa82/0x1000 [ 986.707251][ T1172] watchdog.cold+0x16/0x16b [ 986.711753][ T1172] ? reset_hung_task_detector+0x30/0x30 [ 986.717311][ T1172] kthread+0x3b5/0x4a0 [ 986.721373][ T1172] ? __kthread_bind_mask+0xc0/0xc0 [ 986.726477][ T1172] ret_from_fork+0x1f/0x30 [ 986.732724][ T1172] Kernel Offset: disabled [ 986.737103][ T1172] Rebooting in 86400 seconds..