[ 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 '10.128.0.142' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 488.157729][ T8505] IPVS: ftp: loaded support on port[0] = 21 [ 721.552985][ T1656] INFO: task kworker/u4:0:9 blocked for more than 143 seconds. [ 721.560748][ T1656] Not tainted 5.10.0-rc6-next-20201201-syzkaller #0 [ 721.571230][ T1656] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 721.581045][ T1656] task:kworker/u4:0 state:D stack:23600 pid: 9 ppid: 2 flags:0x00004000 [ 721.590939][ T1656] Workqueue: tc_filter_workqueue tcindex_partial_destroy_work [ 721.599080][ T1656] Call Trace: [ 721.602401][ T1656] __schedule+0x8cd/0x2150 [ 721.607785][ T1656] ? io_schedule_timeout+0x140/0x140 [ 721.613797][ T1656] schedule+0xcf/0x270 [ 721.617886][ T1656] schedule_preempt_disabled+0xf/0x20 [ 721.624224][ T1656] __mutex_lock+0x81a/0x1110 [ 721.628834][ T1656] ? tcindex_partial_destroy_work+0x13/0x50 [ 721.635734][ T1656] ? mutex_lock_io_nested+0xf60/0xf60 [ 721.641137][ T1656] ? lock_release+0x710/0x710 [ 721.646894][ T1656] tcindex_partial_destroy_work+0x13/0x50 [ 721.652649][ T1656] process_one_work+0x98d/0x15f0 [ 721.658716][ T1656] ? pwq_dec_nr_in_flight+0x320/0x320 [ 721.664708][ T1656] ? rwlock_bug.part.0+0x90/0x90 [ 721.669660][ T1656] ? _raw_spin_lock_irq+0x41/0x50 [ 721.675916][ T1656] worker_thread+0x64c/0x1120 [ 721.680625][ T1656] ? process_one_work+0x15f0/0x15f0 [ 721.686873][ T1656] kthread+0x3b1/0x4a0 [ 721.690967][ T1656] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.699139][ T1656] ret_from_fork+0x1f/0x30 [ 721.704336][ T1656] INFO: task kworker/1:1:8497 blocked for more than 143 seconds. [ 721.712060][ T1656] Not tainted 5.10.0-rc6-next-20201201-syzkaller #0 [ 721.720237][ T1656] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 721.730418][ T1656] task:kworker/1:1 state:D stack:29616 pid: 8497 ppid: 2 flags:0x00004000 [ 721.740415][ T1656] Workqueue: ipv6_addrconf addrconf_verify_work [ 721.747290][ T1656] Call Trace: [ 721.750603][ T1656] __schedule+0x8cd/0x2150 [ 721.755956][ T1656] ? io_schedule_timeout+0x140/0x140 [ 721.761257][ T1656] ? _raw_spin_unlock_irq+0x1f/0x40 [ 721.767523][ T1656] ? lockdep_hardirqs_on+0x79/0x100 [ 721.772747][ T1656] schedule+0xcf/0x270 [ 721.777788][ T1656] schedule_preempt_disabled+0xf/0x20 [ 721.783879][ T1656] __mutex_lock+0x81a/0x1110 [ 721.788484][ T1656] ? addrconf_verify_work+0xa/0x20 [ 721.794658][ T1656] ? mutex_lock_io_nested+0xf60/0xf60 [ 721.800048][ T1656] ? lock_release+0x710/0x710 [ 721.805956][ T1656] ? lock_downgrade+0x6d0/0x6d0 [ 721.810840][ T1656] addrconf_verify_work+0xa/0x20 [ 721.816728][ T1656] process_one_work+0x98d/0x15f0 [ 721.821690][ T1656] ? pwq_dec_nr_in_flight+0x320/0x320 [ 721.829393][ T1656] ? rwlock_bug.part.0+0x90/0x90 [ 721.834989][ T1656] ? _raw_spin_lock_irq+0x41/0x50 [ 721.840042][ T1656] worker_thread+0x64c/0x1120 [ 721.845718][ T1656] ? __kthread_parkme+0x13f/0x1e0 [ 721.850753][ T1656] ? process_one_work+0x15f0/0x15f0 [ 721.857133][ T1656] kthread+0x3b1/0x4a0 [ 721.861236][ T1656] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.868155][ T1656] ret_from_fork+0x1f/0x30 [ 721.872644][ T1656] INFO: task syz-executor598:8527 can't die for more than 143 seconds. [ 721.881961][ T1656] task:syz-executor598 state:R running task stack:24992 pid: 8527 ppid: 8505 flags:0x00004006 [ 721.893581][ T1656] Call Trace: [ 721.896889][ T1656] ? lock_release+0x710/0x710 [ 721.901569][ T1656] ? __schedule+0x8d5/0x2150 [ 721.907532][ T1656] ? tcf_idr_check_alloc+0x78/0x3b0 [ 721.912749][ T1656] ? tcf_idr_check_alloc+0x78/0x3b0 [ 721.919007][ T1656] ? mutex_lock_io_nested+0xf60/0xf60 [ 721.924993][ T1656] ? __mutex_unlock_slowpath+0xe2/0x610 [ 721.930558][ T1656] ? wait_for_completion_io+0x260/0x260 [ 721.937059][ T1656] ? tcf_idr_check_alloc+0x78/0x3b0 [ 721.942282][ T1656] ? tcf_police_init+0x347/0x13a0 [ 721.948304][ T1656] ? tcf_police_cleanup+0x60/0x60 [ 721.955119][ T1656] ? find_held_lock+0x2d/0x110 [ 721.959903][ T1656] ? tc_lookup_action_n+0xcd/0xf0 [ 721.965910][ T1656] ? stack_trace_save+0x8c/0xc0 [ 721.970785][ T1656] ? tcf_action_init_1+0x1a3/0x990 [ 721.976869][ T1656] ? tcf_action_dump_old+0x80/0x80 [ 721.981991][ T1656] ? sock_sendmsg+0xcf/0x120 [ 721.987610][ T1656] ? ____sys_sendmsg+0x331/0x810 [ 721.992561][ T1656] ? ___sys_sendmsg+0xf3/0x170 [ 721.998304][ T1656] ? __sys_sendmmsg+0x195/0x470 [ 722.003879][ T1656] ? __x64_sys_sendmmsg+0x99/0x100 [ 722.009161][ T1656] ? do_syscall_64+0x2d/0x70 [ 722.015087][ T1656] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 722.021183][ T1656] ? find_held_lock+0x2d/0x110 [ 722.026932][ T1656] ? tcf_exts_validate+0x138/0x420 [ 722.032063][ T1656] ? tcf_exts_destroy+0xc0/0xc0 [ 722.037973][ T1656] ? rcu_read_lock_sched_held+0x3a/0x70 [ 722.044155][ T1656] ? unpoison_range+0x2c/0x50 [ 722.048850][ T1656] ? tcindex_set_parms+0x189/0x20d0 [ 722.055023][ T1656] ? tcindex_alloc_perfect_hash+0x440/0x440 [ 722.060940][ T1656] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 722.068172][ T1656] ? __nla_validate_parse+0x2d3/0x2ae0 [ 722.074223][ T1656] ? nla_get_range_signed+0x520/0x520 [ 722.079616][ T1656] ? find_held_lock+0x2d/0x110 [ 722.086749][ T1656] ? tcindex_change+0x1b7/0x320 [ 722.091617][ T1656] ? tcindex_change+0x212/0x320 [ 722.097594][ T1656] ? tcindex_set_parms+0x20d0/0x20d0 [ 722.103468][ T1656] ? tcindex_lookup+0x390/0x390 [ 722.108331][ T1656] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 722.115798][ T1656] ? __sanitizer_cov_trace_cmp2+0x22/0x80 [ 722.121540][ T1656] ? tc_new_tfilter+0x1394/0x2120 [ 722.127551][ T1656] ? tcindex_set_parms+0x20d0/0x20d0 [ 722.133444][ T1656] ? tc_del_tfilter+0x15c0/0x15c0 [ 722.138486][ T1656] ? kernel_text_address+0xbd/0xf0 [ 722.144572][ T1656] ? tc_del_tfilter+0x15c0/0x15c0 [ 722.149611][ T1656] ? rtnetlink_rcv_msg+0x80e/0xad0 [ 722.155734][ T1656] ? rtnetlink_put_metrics+0x510/0x510 [ 722.161227][ T1656] ? netlink_rcv_skb+0x153/0x420 [ 722.167139][ T1656] ? rtnetlink_put_metrics+0x510/0x510 [ 722.172619][ T1656] ? netlink_ack+0xaa0/0xaa0 [ 722.178246][ T1656] ? netlink_deliver_tap+0x227/0xb70 [ 722.184165][ T1656] ? netlink_unicast+0x533/0x7d0 [ 722.189121][ T1656] ? netlink_attachskb+0x870/0x870 [ 722.195168][ T1656] ? __phys_addr_symbol+0x2c/0x70 [ 722.200208][ T1656] ? __sanitizer_cov_trace_cmp8+0x1d/0x70 [ 722.206924][ T1656] ? __check_object_size+0x171/0x3f0 [ 722.212226][ T1656] ? netlink_sendmsg+0x856/0xd90 [ 722.219416][ T1656] ? netlink_unicast+0x7d0/0x7d0 [ 722.225093][ T1656] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 722.231348][ T1656] ? netlink_unicast+0x7d0/0x7d0 [ 722.237642][ T1656] ? sock_sendmsg+0xcf/0x120 [ 722.242249][ T1656] ? ____sys_sendmsg+0x331/0x810 [ 722.248332][ T1656] ? kernel_sendmsg+0x50/0x50 [ 722.253601][ T1656] ? do_recvmmsg+0x6c0/0x6c0 [ 722.258212][ T1656] ? __lock_acquire+0x16b7/0x5500 [ 722.264181][ T1656] ? ___sys_sendmsg+0xf3/0x170 [ 722.268959][ T1656] ? sendmsg_copy_msghdr+0x160/0x160 [ 722.275252][ T1656] ? find_held_lock+0x2d/0x110 [ 722.280036][ T1656] ? __might_fault+0xd3/0x180 [ 722.285688][ T1656] ? lock_downgrade+0x6d0/0x6d0 [ 722.290576][ T1656] ? __sys_sendmmsg+0x195/0x470 [ 722.296360][ T1656] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 722.301419][ T1656] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 722.308606][ T1656] ? sockfd_lookup_light+0xc6/0x180 [ 722.314442][ T1656] ? __sys_sendmsg+0x10c/0x1b0 [ 722.319221][ T1656] ? __sys_sendmsg_sock+0xb0/0xb0 [ 722.325229][ T1656] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 722.331607][ T1656] ? __x64_sys_sendmmsg+0x99/0x100 [ 722.337878][ T1656] ? syscall_enter_from_user_mode+0x1d/0x50 [ 722.345568][ T1656] ? do_syscall_64+0x2d/0x70 [ 722.350183][ T1656] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 722.357497][ T1656] [ 722.357497][ T1656] Showing all locks held in the system: [ 722.365962][ T1656] 3 locks held by kworker/u4:0/9: [ 722.370988][ T1656] #0: ffff8880151c9138 ((wq_completion)tc_filter_workqueue){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 [ 722.385478][ T1656] #1: ffffc90000ce7da8 ((work_completion)(&(rwork)->work)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 [ 722.397602][ T1656] #2: ffffffff8c940f88 (rtnl_mutex){+.+.}-{3:3}, at: tcindex_partial_destroy_work+0x13/0x50 [ 722.408573][ T1656] 1 lock held by khungtaskd/1656: [ 722.414176][ T1656] #0: ffffffff8b33a7a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 722.424698][ T1656] 1 lock held by in:imklog/8182: [ 722.429634][ T1656] #0: ffff8880153fcff0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 722.439785][ T1656] 3 locks held by kworker/1:1/8497: [ 722.445750][ T1656] #0: ffff888147308138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 [ 722.457741][ T1656] #1: ffffc90000edfda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 [ 722.468666][ T1656] #2: ffffffff8c940f88 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 722.479927][ T1656] 1 lock held by syz-executor598/8527: [ 722.486067][ T1656] [ 722.488399][ T1656] ============================================= [ 722.488399][ T1656] [ 722.497818][ T1656] NMI backtrace for cpu 1 [ 722.502160][ T1656] CPU: 1 PID: 1656 Comm: khungtaskd Not tainted 5.10.0-rc6-next-20201201-syzkaller #0 [ 722.511690][ T1656] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 722.521739][ T1656] Call Trace: [ 722.525033][ T1656] dump_stack+0x107/0x163 [ 722.529365][ T1656] nmi_cpu_backtrace.cold+0x44/0xd7 [ 722.534568][ T1656] ? lapic_can_unplug_cpu+0x80/0x80 [ 722.539770][ T1656] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 722.545751][ T1656] watchdog+0xd89/0xf30 [ 722.549910][ T1656] ? trace_sched_process_hang+0x280/0x280 [ 722.555643][ T1656] kthread+0x3b1/0x4a0 [ 722.559704][ T1656] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 722.565613][ T1656] ret_from_fork+0x1f/0x30 [ 722.570266][ T1656] Sending NMI from CPU 1 to CPUs 0: [ 722.576604][ C0] NMI backtrace for cpu 0 [ 722.576612][ C0] CPU: 0 PID: 8527 Comm: syz-executor598 Not tainted 5.10.0-rc6-next-20201201-syzkaller #0 [ 722.576619][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 722.576624][ C0] RIP: 0010:__lock_acquire+0x39b/0x5500 [ 722.576636][ C0] Code: 00 45 09 f9 c1 e0 14 41 09 c1 41 8b 44 24 20 25 ff 1f 00 00 41 09 c1 48 b8 00 00 00 00 00 fc ff df 45 89 4c 24 20 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 96 11 00 00 8b [ 722.576641][ C0] RSP: 0018:ffffc90000e1e858 EFLAGS: 00000002 [ 722.576651][ C0] RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000000 [ 722.576657][ C0] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880167059fc [ 722.576663][ C0] RBP: ffff888016705040 R08: 0000000000000001 R09: 0000000000040640 [ 722.576669][ C0] R10: 0000000000000028 R11: 0000000000000000 R12: ffff8880167059d8 [ 722.576675][ C0] R13: 0000000000000000 R14: ffff888012047668 R15: 0000000000040000 [ 722.576681][ C0] FS: 0000000000ecc880(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 [ 722.576686][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 722.576693][ C0] CR2: 00007fd789f216c0 CR3: 0000000012079000 CR4: 00000000001506f0 [ 722.576699][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 722.576705][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 722.576708][ C0] Call Trace: [ 722.576713][ C0] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 722.576717][ C0] ? sched_clock+0x2a/0x40 [ 722.576721][ C0] ? sched_clock_cpu+0x18/0x1f0 [ 722.576725][ C0] ? sched_clock_cpu+0x18/0x1f0 [ 722.576729][ C0] lock_acquire+0x29d/0x740 [ 722.576734][ C0] ? tcf_idr_check_alloc+0x78/0x3b0 [ 722.576738][ C0] ? lock_release+0x710/0x710 [ 722.576742][ C0] __mutex_lock+0x134/0x1110 [ 722.576746][ C0] ? tcf_idr_check_alloc+0x78/0x3b0 [ 722.576750][ C0] ? tcf_idr_check_alloc+0x78/0x3b0 [ 722.576755][ C0] ? mutex_lock_io_nested+0xf60/0xf60 [ 722.576759][ C0] ? __mutex_unlock_slowpath+0xe2/0x610 [ 722.576763][ C0] ? wait_for_completion_io+0x260/0x260 [ 722.576767][ C0] tcf_idr_check_alloc+0x78/0x3b0 [ 722.576772][ C0] tcf_police_init+0x347/0x13a0 [ 722.576776][ C0] ? tcf_police_cleanup+0x60/0x60 [ 722.576780][ C0] ? find_held_lock+0x2d/0x110 [ 722.576784][ C0] ? tc_lookup_action_n+0xcd/0xf0 [ 722.576788][ C0] ? stack_trace_save+0x8c/0xc0 [ 722.576792][ C0] tcf_action_init_1+0x1a3/0x990 [ 722.576796][ C0] ? tcf_action_dump_old+0x80/0x80 [ 722.576800][ C0] ? sock_sendmsg+0xcf/0x120 [ 722.576804][ C0] ? ____sys_sendmsg+0x331/0x810 [ 722.576808][ C0] ? ___sys_sendmsg+0xf3/0x170 [ 722.576812][ C0] ? __sys_sendmmsg+0x195/0x470 [ 722.576817][ C0] ? __x64_sys_sendmmsg+0x99/0x100 [ 722.576821][ C0] ? do_syscall_64+0x2d/0x70 [ 722.576825][ C0] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 722.576829][ C0] ? find_held_lock+0x2d/0x110 [ 722.576834][ C0] tcf_exts_validate+0x138/0x420 [ 722.576838][ C0] ? tcf_exts_destroy+0xc0/0xc0 [ 722.576842][ C0] ? rcu_read_lock_sched_held+0x3a/0x70 [ 722.576846][ C0] ? unpoison_range+0x2c/0x50 [ 722.576850][ C0] tcindex_set_parms+0x189/0x20d0 [ 722.576855][ C0] ? tcindex_alloc_perfect_hash+0x440/0x440 [ 722.576860][ C0] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 722.576865][ C0] ? __nla_validate_parse+0x2d3/0x2ae0 [ 722.576869][ C0] ? nla_get_range_signed+0x520/0x520 [ 722.576873][ C0] ? find_held_lock+0x2d/0x110 [ 722.576877][ C0] ? tcindex_change+0x1b7/0x320 [ 722.576881][ C0] tcindex_change+0x212/0x320 [ 722.576885][ C0] ? tcindex_set_parms+0x20d0/0x20d0 [ 722.576890][ C0] ? tcindex_lookup+0x390/0x390 [ 722.576894][ C0] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 722.576899][ C0] ? __sanitizer_cov_trace_cmp2+0x22/0x80 [ 722.576903][ C0] tc_new_tfilter+0x1394/0x2120 [ 722.576908][ C0] ? tcindex_set_parms+0x20d0/0x20d0 [ 722.576912][ C0] ? tc_del_tfilter+0x15c0/0x15c0 [ 722.576916][ C0] ? kernel_text_address+0xbd/0xf0 [ 722.576920][ C0] ? tc_del_tfilter+0x15c0/0x15c0 [ 722.576924][ C0] rtnetlink_rcv_msg+0x80e/0xad0 [ 722.576929][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 722.576933][ C0] netlink_rcv_skb+0x153/0x420 [ 722.576937][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 722.576941][ C0] ? netlink_ack+0xaa0/0xaa0 [ 722.576945][ C0] ? netlink_deliver_tap+0x227/0xb70 [ 722.576949][ C0] netlink_unicast+0x533/0x7d0 [ 722.576954][ C0] ? netlink_attachskb+0x870/0x870 [ 722.576958][ C0] ? __phys_addr_symbol+0x2c/0x70 [ 722.576963][ C0] ? __sanitizer_cov_trace_cmp8+0x1d/0x70 [ 722.576967][ C0] ? __check_object_size+0x171/0x3f0 [ 722.576971][ C0] netlink_sendmsg+0x856/0xd90 [ 722.576975][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 722.576980][ C0] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 722.576984][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 722.576988][ C0] sock_sendmsg+0xcf/0x120 [ 722.576992][ C0] ____sys_sendmsg+0x331/0x810 [ 722.576996][ C0] ? kernel_sendmsg+0x50/0x50 [ 722.577000][ C0] ? do_recvmmsg+0x6c0/0x6c0 [ 722.577004][ C0] ? __lock_acquire+0x16b7/0x5500 [ 722.577008][ C0] ___sys_sendmsg+0xf3/0x170 [ 722.577013][ C0] ? sendmsg_copy_msghdr+0x160/0x160 [ 722.577017][ C0] ? find_held_lock+0x2d/0x110 [ 722.577021][ C0] ? __might_fault+0xd3/0x180 [ 722.577025][ C0] ? lock_downgrade+0x6d0/0x6d0 [ 722.577029][ C0] __sys_sendmmsg+0x195/0x470 [ 722.577033][ C0] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 722.577038][ C0] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 722.577042][ C0] ? sockfd_lookup_light+0xc6/0x180 [ 722.577046][ C0] ? __sys_sendmsg+0x10c/0x1b0 [ 722.577050][ C0] ? __sys_sendmsg_sock+0xb0/0xb0 [ 722.577055][ C0] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 722.577059][ C0] __x64_sys_sendmmsg+0x99/0x100 [ 722.577064][ C0] ? syscall_enter_from_user_mode+0x1d/0x50 [ 722.577068][ C0] do_syscall_64+0x2d/0x70 [ 722.577072][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 722.577076][ C0] RIP: 0033:0x441709 [ 722.577089][ C0] Code: e8 5c ad 02 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 bb 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 722.577098][ C0] RSP: 002b:00007ffc72e86e18 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 722.577108][ C0] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441709 [ 722.577114][ C0] RDX: 010efe10675dec16 RSI: 0000000020000200 RDI: 0000000000000003 [ 722.577120][ C0] RBP: 00007ffc72e86e20 R08: 0000000120080522 R09: 0000000120080522 [ 722.577126][ C0] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a2a50 [ 722.577132][ C0] R13: 00000000004025e0 R14: 0000000000000000 R15: 0000000000000000 [ 722.577138][ C0] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.043 msecs [ 722.592807][ T1656] Kernel panic - not syncing: hung_task: blocked tasks [ 723.238335][ T1656] CPU: 1 PID: 1656 Comm: khungtaskd Not tainted 5.10.0-rc6-next-20201201-syzkaller #0 [ 723.247855][ T1656] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 723.257891][ T1656] Call Trace: [ 723.261172][ T1656] dump_stack+0x107/0x163 [ 723.265492][ T1656] panic+0x306/0x73d [ 723.269371][ T1656] ? __warn_printk+0xf3/0xf3 [ 723.273951][ T1656] ? lapic_can_unplug_cpu+0x80/0x80 [ 723.279134][ T1656] ? preempt_schedule_thunk+0x16/0x18 [ 723.284494][ T1656] ? nmi_trigger_cpumask_backtrace+0x196/0x230 [ 723.290646][ T1656] ? watchdog.cold+0x22d/0x248 [ 723.295411][ T1656] watchdog.cold+0x23e/0x248 [ 723.299994][ T1656] ? trace_sched_process_hang+0x280/0x280 [ 723.305700][ T1656] kthread+0x3b1/0x4a0 [ 723.309753][ T1656] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 723.315631][ T1656] ret_from_fork+0x1f/0x30 [ 723.320851][ T1656] Kernel Offset: disabled [ 723.325181][ T1656] Rebooting in 86400 seconds..