[ OK ] Reached target Login Prompts. [ 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. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.252' (ECDSA) to the list of known hosts. 2021/01/01 07:06:02 parsed 1 programs 2021/01/01 07:06:03 executed programs: 0 syzkaller login: [ 1585.642688] IPVS: ftp: loaded support on port[0] = 21 [ 1585.771971] chnl_net:caif_netlink_parms(): no params data found [ 1585.860418] bridge0: port 1(bridge_slave_0) entered blocking state [ 1585.867185] bridge0: port 1(bridge_slave_0) entered disabled state [ 1585.874757] device bridge_slave_0 entered promiscuous mode [ 1585.883512] bridge0: port 2(bridge_slave_1) entered blocking state [ 1585.890025] bridge0: port 2(bridge_slave_1) entered disabled state [ 1585.897269] device bridge_slave_1 entered promiscuous mode [ 1585.914911] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 1585.923840] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 1585.942995] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 1585.950509] team0: Port device team_slave_0 added [ 1585.957107] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 1585.964368] team0: Port device team_slave_1 added [ 1585.981222] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 1585.987823] batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. [ 1586.013897] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 1586.026093] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 1586.032347] batman_adv: batadv0: The MTU of interface batadv_slave_1 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. [ 1586.057887] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 1586.068753] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 1586.076549] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 1586.096825] device hsr_slave_0 entered promiscuous mode [ 1586.102522] device hsr_slave_1 entered promiscuous mode [ 1586.109121] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 1586.116366] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 1586.187651] bridge0: port 2(bridge_slave_1) entered blocking state [ 1586.194089] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1586.201080] bridge0: port 1(bridge_slave_0) entered blocking state [ 1586.207510] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1586.238746] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 1586.246487] 8021q: adding VLAN 0 to HW filter on device bond0 [ 1586.254462] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 1586.263862] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 1586.273487] bridge0: port 1(bridge_slave_0) entered disabled state [ 1586.280803] bridge0: port 2(bridge_slave_1) entered disabled state [ 1586.288179] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 1586.300651] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 1586.306964] 8021q: adding VLAN 0 to HW filter on device team0 [ 1586.317684] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 1586.326242] bridge0: port 1(bridge_slave_0) entered blocking state [ 1586.332567] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1586.354601] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 1586.364607] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 1586.377132] IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready [ 1586.384253] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 1586.392808] bridge0: port 2(bridge_slave_1) entered blocking state [ 1586.399220] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1586.406943] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 1586.414633] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 1586.422541] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 1586.430389] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 1586.438257] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 1586.445337] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 1586.458286] IPv6: ADDRCONF(NETDEV_UP): vxcan0: link is not ready [ 1586.466698] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 1586.473403] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 1586.486213] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 1586.499324] IPv6: ADDRCONF(NETDEV_UP): veth0_virt_wifi: link is not ready [ 1586.509772] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 1586.549406] IPv6: ADDRCONF(NETDEV_UP): veth0_vlan: link is not ready [ 1586.556759] IPv6: ADDRCONF(NETDEV_UP): vlan0: link is not ready [ 1586.563353] IPv6: ADDRCONF(NETDEV_UP): vlan1: link is not ready [ 1586.573838] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 1586.581781] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 1586.589389] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 1586.598627] device veth0_vlan entered promiscuous mode [ 1586.608143] device veth1_vlan entered promiscuous mode [ 1586.614095] IPv6: ADDRCONF(NETDEV_UP): macvlan0: link is not ready [ 1586.623791] IPv6: ADDRCONF(NETDEV_UP): macvlan1: link is not ready [ 1586.635725] IPv6: ADDRCONF(NETDEV_UP): veth0_macvtap: link is not ready [ 1586.644855] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 1586.653145] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 1586.661364] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 1586.671564] device veth0_macvtap entered promiscuous mode [ 1586.678188] IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready [ 1586.686952] device veth1_macvtap entered promiscuous mode [ 1586.695913] IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready [ 1586.705640] IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready [ 1586.716313] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 1586.722982] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 1586.731949] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 1586.744123] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 1586.752454] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 1586.865885] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready [ 1586.873184] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 1586.888951] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 1586.899899] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 1586.910928] IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready [ 1586.917688] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 1586.924909] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 1586.932847] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready [ 1587.686191] Bluetooth: hci0: command 0x0409 tx timeout 2021/01/01 07:06:08 executed programs: 3 [ 1589.775192] Bluetooth: hci0: command 0x041b tx timeout [ 1591.845670] Bluetooth: hci0: command 0x040f tx timeout [ 1593.925355] Bluetooth: hci0: command 0x0419 tx timeout [ 1707.845123] Bluetooth: hci0: command 0x0406 tx timeout [ 1741.615285] INFO: task syz-executor.0:8444 blocked for more than 140 seconds. [ 1741.623437] Not tainted 4.19.164-syzkaller #0 [ 1741.628618] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1741.636701] syz-executor.0 D27992 8444 8149 0x00000004 [ 1741.642365] Call Trace: [ 1741.644952] __schedule+0x887/0x2040 [ 1741.648812] ? io_schedule_timeout+0x140/0x140 [ 1741.658179] ? mark_held_locks+0xf0/0xf0 [ 1741.662281] schedule+0x8d/0x1b0 [ 1741.665861] schedule_timeout+0x92d/0xfe0 [ 1741.670043] ? lock_acquire+0x170/0x3c0 [ 1741.674104] ? finish_task_switch+0x118/0x760 [ 1741.679028] ? usleep_range+0x170/0x170 [ 1741.683171] ? wait_for_common+0x294/0x470 [ 1741.687556] ? lock_downgrade+0x720/0x720 [ 1741.691933] ? lock_acquire+0x170/0x3c0 [ 1741.696033] ? wait_for_common+0x9e/0x470 [ 1741.700210] ? _raw_spin_unlock_irq+0x24/0x80 [ 1741.705875] wait_for_common+0x29c/0x470 [ 1741.709999] ? __flush_work+0x37e/0x8b0 [ 1741.716124] ? bit_wait_io_timeout+0x100/0x100 [ 1741.720823] ? ___preempt_schedule+0x16/0x18 [ 1741.726024] ? wake_up_q+0xe0/0xe0 [ 1741.733448] ? ___preempt_schedule+0x16/0x18 [ 1741.737958] __flush_work+0x4bb/0x8b0 [ 1741.741895] ? alloc_unbound_pwq+0xc10/0xc10 [ 1741.746477] ? flush_workqueue_prep_pwqs+0x570/0x570 [ 1741.751709] ? _raw_spin_unlock_irq+0x5a/0x80 [ 1741.756291] ? __flush_work+0x4cf/0x8b0 [ 1741.760280] ? trace_hardirqs_off+0x64/0x200 [ 1741.764697] ? __cancel_work_timer+0x3ba/0x590 [ 1741.769464] __cancel_work_timer+0x412/0x590 [ 1741.773910] ? try_to_grab_pending+0x6f0/0x6f0 [ 1741.778661] ? lock_downgrade+0x720/0x720 [ 1741.782834] ? lock_acquire+0x170/0x3c0 [ 1741.786917] ? p9_fd_close+0x172/0x520 [ 1741.790949] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 1741.797327] p9_fd_close+0x305/0x520 [ 1741.801117] p9_client_create+0x901/0x12e0 [ 1741.805497] ? setup_fault_attr+0x200/0x200 [ 1741.809836] ? p9_client_flush+0x490/0x490 [ 1741.814080] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 1741.819198] ? __lockdep_init_map+0x100/0x5a0 [ 1741.823731] ? __raw_spin_lock_init+0x28/0x100 [ 1741.828443] v9fs_session_init+0x1dd/0x1770 [ 1741.832889] ? gfp_pfmemalloc_allowed+0x150/0x150 [ 1741.837820] ? v9fs_show_options+0x760/0x760 [ 1741.842370] ? setup_fault_attr+0x200/0x200 [ 1741.846880] ? lock_acquire+0x170/0x3c0 [ 1741.850887] ? check_preemption_disabled+0x41/0x280 [ 1741.856076] ? v9fs_mount+0x54/0x910 [ 1741.859819] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 1741.866394] ? kmem_cache_alloc_trace+0x323/0x380 [ 1741.871258] v9fs_mount+0x73/0x910 [ 1741.874855] ? alloc_pages_current+0x19b/0x2a0 [ 1741.879757] ? __lockdep_init_map+0x100/0x5a0 [ 1741.884654] mount_fs+0xa3/0x30c [ 1741.888320] vfs_kern_mount.part.0+0x68/0x470 [ 1741.892853] do_mount+0x113c/0x2f10 [ 1741.896955] ? lock_acquire+0x170/0x3c0 [ 1741.902805] ? check_preemption_disabled+0x41/0x280 [ 1741.907984] ? copy_mount_string+0x40/0x40 [ 1741.912246] ? copy_mount_options+0x59/0x380 [ 1741.916789] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 1741.925509] ? kmem_cache_alloc_trace+0x323/0x380 [ 1741.930381] ? copy_mount_options+0x26f/0x380 [ 1741.934871] ksys_mount+0xcf/0x130 [ 1741.938507] __x64_sys_mount+0xba/0x150 [ 1741.942717] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 1741.947443] do_syscall_64+0xf9/0x620 [ 1741.951363] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1741.957240] RIP: 0033:0x45e219 [ 1741.960471] Code: a0 64 48 8b 0c 25 f8 ff ff ff 48 3b 61 10 76 4e 48 83 ec 28 48 89 6c 24 20 48 8d 6c 24 20 0f b6 42 10 0f b6 4a 11 48 8b 5a 18 <48> 89 5c 24 18 48 8b 52 08 48 8b 12 48 89 14 24 88 44 24 08 88 4c [ 1741.979815] RSP: 002b:00007fe53a5bac68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 1741.987609] RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e219 [ 1741.995558] RDX: 0000000020000240 RSI: 0000000020000200 RDI: 0000000000000000 [ 1742.004625] RBP: 000000000119c1c8 R08: 0000000020000580 R09: 0000000000000000 [ 1742.012701] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c184 [ 1742.020117] R13: 00007ffefc7a2acf R14: 00007fe53a5bb9c0 R15: 000000000119c184 [ 1742.027653] [ 1742.027653] Showing all locks held in the system: [ 1742.034044] 1 lock held by khungtaskd/1565: [ 1742.038560] #0: 00000000f7298f6f (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 [ 1742.047608] 1 lock held by in:imklog/7768: [ 1742.051923] #0: 0000000026e04274 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 [ 1742.060448] 2 locks held by kworker/1:0/8118: [ 1742.065268] #0: 0000000050749f98 ((wq_completion)"events"){+.+.}, at: process_one_work+0x767/0x1570 [ 1742.074586] #1: 000000000c3471fa ((work_completion)(&m->wq)){+.+.}, at: process_one_work+0x79c/0x1570 [ 1742.084576] [ 1742.086284] ============================================= [ 1742.086284] [ 1742.093412] NMI backtrace for cpu 0 [ 1742.097134] CPU: 0 PID: 1565 Comm: khungtaskd Not tainted 4.19.164-syzkaller #0 [ 1742.104601] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1742.114579] Call Trace: [ 1742.117597] dump_stack+0x1fc/0x2fe [ 1742.121934] nmi_cpu_backtrace.cold+0x63/0xa2 [ 1742.126495] ? lapic_can_unplug_cpu.cold+0x39/0x39 [ 1742.131611] nmi_trigger_cpumask_backtrace+0x1a6/0x1eb [ 1742.142602] watchdog+0x991/0xe60 [ 1742.146153] ? reset_hung_task_detector+0x30/0x30 [ 1742.151003] kthread+0x33f/0x460 [ 1742.154392] ? kthread_park+0x180/0x180 [ 1742.158538] ret_from_fork+0x24/0x30 [ 1742.162534] Sending NMI from CPU 0 to CPUs 1: [ 1742.168220] NMI backtrace for cpu 1 [ 1742.168226] CPU: 1 PID: 8169 Comm: kworker/u4:0 Not tainted 4.19.164-syzkaller #0 [ 1742.168233] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1742.168237] Workqueue: phy2 ieee80211_iface_work [ 1742.168244] RIP: 0010:unwind_next_frame+0x126/0x1c60 [ 1742.168254] Code: ff df 80 3c 02 00 0f 85 f2 13 00 00 49 8b 47 38 bf 01 00 00 00 48 89 44 24 10 e8 45 52 18 00 49 8d 47 50 48 89 c2 48 89 04 24 <48> b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 c9 13 [ 1742.168259] RSP: 0018:ffff8880af1ef038 EFLAGS: 00000246 [ 1742.168266] RAX: ffff8880af1ef170 RBX: 1ffff11015e3de0f RCX: 0000000000000000 [ 1742.168272] RDX: ffff8880af1ef170 RSI: 0000000000000000 RDI: ffff8880b2ea9630 [ 1742.168277] RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000001 [ 1742.168282] R10: 0000000000074071 R11: 0000000000000001 R12: ffff8880af1ef168 [ 1742.168288] R13: 0000000000000000 R14: ffff8880af1ef158 R15: ffff8880af1ef120 [ 1742.168294] FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 [ 1742.168298] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1742.168304] CR2: 00007fdd96e61000 CR3: 00000000a168b000 CR4: 00000000001406e0 [ 1742.168309] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1742.168315] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 1742.168318] Call Trace: [ 1742.168322] ? ieee80211_rx_mgmt_probe_beacon+0xb4f/0x15c0 [ 1742.168326] ? deref_stack_reg+0x1d0/0x1d0 [ 1742.168331] ? ieee80211_rx_mgmt_probe_beacon+0xb4f/0x15c0 [ 1742.168335] __save_stack_trace+0x9f/0x190 [ 1742.168339] ? ieee80211_rx_mgmt_probe_beacon+0xb4f/0x15c0 [ 1742.168343] kasan_kmalloc+0xeb/0x160 [ 1742.168346] ? __kmalloc+0x15a/0x3c0 [ 1742.168351] ? cfg80211_inform_bss_frame_data+0x200/0xeb0 [ 1742.168355] ? ieee80211_bss_info_update+0x42d/0x1800 [ 1742.168360] ? ieee80211_rx_mgmt_probe_beacon+0xb4f/0x15c0 [ 1742.168364] ? ieee80211_ibss_rx_queued_mgmt+0xe27/0x18b0 [ 1742.168368] ? ieee80211_iface_work+0x5c4/0x8a0 [ 1742.168372] ? process_one_work+0x864/0x1570 [ 1742.168376] ? worker_thread+0x64c/0x1130 [ 1742.168380] ? kthread+0x33f/0x460 [ 1742.168383] ? ret_from_fork+0x24/0x30 [ 1742.168387] ? debug_object_active_state+0x254/0x330 [ 1742.168391] ? debug_object_init_on_stack+0x20/0x20 [ 1742.168395] ? cfg80211_bss_update+0x90e/0x2490 [ 1742.168399] ? should_fail+0x142/0x7b0 [ 1742.168403] ? setup_fault_attr+0x200/0x200 [ 1742.168407] ? mark_held_locks+0xa6/0xf0 [ 1742.168410] ? __kmalloc+0x2e5/0x3c0 [ 1742.168414] __kmalloc+0x15a/0x3c0 [ 1742.168418] ? cfg80211_inform_bss_frame_data+0x200/0xeb0 [ 1742.168422] cfg80211_inform_bss_frame_data+0x200/0xeb0 [ 1742.168426] ? cfg80211_inform_bss_data+0x9b0/0x9b0 [ 1742.168430] ? __lock_acquire+0x6de/0x3ff0 [ 1742.168434] ? lock_downgrade+0x720/0x720 [ 1742.168438] ? check_preemption_disabled+0x41/0x280 [ 1742.168442] ? check_preemption_disabled+0x41/0x280 [ 1742.168446] ieee80211_bss_info_update+0x42d/0x1800 [ 1742.168450] ? ieee80211_rx_bss_put+0x50/0x50 [ 1742.168454] ? check_preemption_disabled+0x41/0x280 [ 1742.168459] ieee80211_rx_mgmt_probe_beacon+0xb4f/0x15c0 [ 1742.168464] ? ieee80211_ibss_process_chanswitch.constprop.0+0xb90/0xb90 [ 1742.168468] ? cpumask_next_and+0x44/0x50 [ 1742.168472] ? find_busiest_group+0x383/0x25f0 [ 1742.168476] ? __lock_acquire+0x6de/0x3ff0 [ 1742.168479] ? load_balance+0xa69/0x2080 [ 1742.168483] ? __lock_acquire+0x6de/0x3ff0 [ 1742.168488] ieee80211_ibss_rx_queued_mgmt+0xe27/0x18b0 [ 1742.168492] ? ieee80211_ibss_rx_no_sta+0x810/0x810 [ 1742.168496] ? mark_held_locks+0xf0/0xf0 [ 1742.168500] ? find_busiest_group+0x25f0/0x25f0 [ 1742.168504] ? debug_object_deactivate+0x1f9/0x2e0 [ 1742.168508] ? mark_held_locks+0xf0/0xf0 [ 1742.168511] ? skb_dequeue+0x125/0x180 [ 1742.168515] ? mark_held_locks+0xa6/0xf0 [ 1742.168519] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 1742.168523] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 1742.168528] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 1742.168531] ieee80211_iface_work+0x5c4/0x8a0 [ 1742.168535] process_one_work+0x864/0x1570 [ 1742.168539] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 1742.168543] worker_thread+0x64c/0x1130 [ 1742.168547] ? __kthread_parkme+0x133/0x1e0 [ 1742.168551] ? process_one_work+0x1570/0x1570 [ 1742.168554] kthread+0x33f/0x460 [ 1742.168558] ? kthread_park+0x180/0x180 [ 1742.168562] ret_from_fork+0x24/0x30 [ 1742.204692] Kernel panic - not syncing: hung_task: blocked tasks [ 1742.586073] CPU: 0 PID: 1565 Comm: khungtaskd Not tainted 4.19.164-syzkaller #0 [ 1742.593507] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1742.602866] Call Trace: [ 1742.605447] dump_stack+0x1fc/0x2fe [ 1742.609077] panic+0x26a/0x50e [ 1742.612256] ? __warn_printk+0xf3/0xf3 [ 1742.616147] ? lapic_can_unplug_cpu.cold+0x39/0x39 [ 1742.621077] ? ___preempt_schedule+0x16/0x18 [ 1742.625952] ? watchdog+0x991/0xe60 [ 1742.629711] ? nmi_trigger_cpumask_backtrace+0x15e/0x1eb [ 1742.635221] watchdog+0x9a2/0xe60 [ 1742.638687] ? reset_hung_task_detector+0x30/0x30 [ 1742.643792] kthread+0x33f/0x460 [ 1742.647160] ? kthread_park+0x180/0x180 [ 1742.651122] ret_from_fork+0x24/0x30 [ 1742.655553] Kernel Offset: disabled [ 1742.659194] Rebooting in 86400 seconds..