[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.15.201' (ECDSA) to the list of known hosts. 2020/12/28 01:43:25 parsed 1 programs 2020/12/28 01:43:26 executed programs: 0 syzkaller login: [ 1587.670255] IPVS: ftp: loaded support on port[0] = 21 [ 1587.794655] chnl_net:caif_netlink_parms(): no params data found [ 1587.887302] bridge0: port 1(bridge_slave_0) entered blocking state [ 1587.893907] bridge0: port 1(bridge_slave_0) entered disabled state [ 1587.902041] device bridge_slave_0 entered promiscuous mode [ 1587.909997] bridge0: port 2(bridge_slave_1) entered blocking state [ 1587.916749] bridge0: port 2(bridge_slave_1) entered disabled state [ 1587.923752] device bridge_slave_1 entered promiscuous mode [ 1587.942367] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 1587.951261] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 1587.970028] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 1587.977643] team0: Port device team_slave_0 added [ 1587.983136] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 1587.990951] team0: Port device team_slave_1 added [ 1588.005697] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 1588.012215] 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. [ 1588.037470] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 1588.048888] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 1588.055119] 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. [ 1588.081023] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 1588.091801] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 1588.099627] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 1588.118930] device hsr_slave_0 entered promiscuous mode [ 1588.124607] device hsr_slave_1 entered promiscuous mode [ 1588.130986] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 1588.138177] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 1588.204784] bridge0: port 2(bridge_slave_1) entered blocking state [ 1588.211240] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1588.218255] bridge0: port 1(bridge_slave_0) entered blocking state [ 1588.224651] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1588.258621] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 1588.264705] 8021q: adding VLAN 0 to HW filter on device bond0 [ 1588.274537] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 1588.283958] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 1588.293021] bridge0: port 1(bridge_slave_0) entered disabled state [ 1588.300934] bridge0: port 2(bridge_slave_1) entered disabled state [ 1588.308501] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 1588.320733] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 1588.326879] 8021q: adding VLAN 0 to HW filter on device team0 [ 1588.335524] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 1588.344435] bridge0: port 1(bridge_slave_0) entered blocking state [ 1588.350948] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1588.361156] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 1588.369155] bridge0: port 2(bridge_slave_1) entered blocking state [ 1588.375500] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1588.397269] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 1588.405205] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 1588.413458] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 1588.421116] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 1588.429378] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 1588.438196] IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready [ 1588.444188] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 1588.457656] IPv6: ADDRCONF(NETDEV_UP): vxcan0: link is not ready [ 1588.464914] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 1588.474161] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 1588.485359] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 1588.498669] IPv6: ADDRCONF(NETDEV_UP): veth0_virt_wifi: link is not ready [ 1588.508483] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 1588.544133] IPv6: ADDRCONF(NETDEV_UP): veth0_vlan: link is not ready [ 1588.551250] IPv6: ADDRCONF(NETDEV_UP): vlan0: link is not ready [ 1588.559464] IPv6: ADDRCONF(NETDEV_UP): vlan1: link is not ready [ 1588.569147] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 1588.577185] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 1588.584107] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 1588.594024] device veth0_vlan entered promiscuous mode [ 1588.603184] device veth1_vlan entered promiscuous mode [ 1588.609518] IPv6: ADDRCONF(NETDEV_UP): macvlan0: link is not ready [ 1588.619157] IPv6: ADDRCONF(NETDEV_UP): macvlan1: link is not ready [ 1588.631053] IPv6: ADDRCONF(NETDEV_UP): veth0_macvtap: link is not ready [ 1588.640138] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 1588.648308] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 1588.655523] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 1588.667588] device veth0_macvtap entered promiscuous mode [ 1588.673706] IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready [ 1588.682253] device veth1_macvtap entered promiscuous mode [ 1588.692074] IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready [ 1588.701309] IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready [ 1588.712164] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 1588.718971] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 1588.727579] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 1588.738430] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 1588.745203] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 1588.861968] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready [ 1588.868758] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 1588.885350] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 1588.898134] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 1588.908798] IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready [ 1588.915155] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 1588.923170] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 1588.930274] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready [ 1589.717369] Bluetooth: hci0: command 0x0409 tx timeout 2020/12/28 01:43:31 executed programs: 3 [ 1591.805974] Bluetooth: hci0: command 0x041b tx timeout [ 1593.877088] Bluetooth: hci0: command 0x040f tx timeout [ 1595.955964] Bluetooth: hci0: command 0x0419 tx timeout 2020/12/28 01:43:36 executed programs: 9 2020/12/28 01:43:41 executed programs: 15 2020/12/28 01:43:47 executed programs: 21 2020/12/28 01:43:52 executed programs: 27 2020/12/28 01:43:58 executed programs: 33 2020/12/28 01:44:03 executed programs: 39 2020/12/28 01:44:08 executed programs: 45 2020/12/28 01:44:14 executed programs: 51 2020/12/28 01:44:19 executed programs: 57 2020/12/28 01:44:24 executed programs: 63 2020/12/28 01:44:30 executed programs: 69 2020/12/28 01:44:35 executed programs: 75 2020/12/28 01:44:40 executed programs: 81 2020/12/28 01:44:46 executed programs: 87 2020/12/28 01:44:51 executed programs: 93 2020/12/28 01:44:57 executed programs: 99 2020/12/28 01:45:02 executed programs: 105 2020/12/28 01:45:07 executed programs: 111 2020/12/28 01:45:13 executed programs: 117 [ 1712.836073] Bluetooth: hci0: command 0x0406 tx timeout [ 1843.876094] INFO: task syz-executor.0:9203 blocked for more than 140 seconds. [ 1843.883536] Not tainted 4.19.163-syzkaller #0 [ 1843.890175] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1843.898795] syz-executor.0 D27992 9203 8109 0x00000004 [ 1843.904418] Call Trace: [ 1843.907064] __schedule+0x887/0x2040 [ 1843.910802] ? io_schedule_timeout+0x140/0x140 [ 1843.915387] ? mark_held_locks+0xf0/0xf0 [ 1843.920352] schedule+0x8d/0x1b0 [ 1843.923772] schedule_timeout+0x92d/0xfe0 [ 1843.927979] ? lock_acquire+0x170/0x3c0 [ 1843.931962] ? finish_task_switch+0x118/0x780 [ 1843.937173] ? usleep_range+0x170/0x170 [ 1843.941194] ? wait_for_common+0x294/0x470 [ 1843.945413] ? lock_downgrade+0x720/0x720 [ 1843.950528] ? lock_acquire+0x170/0x3c0 [ 1843.954518] ? wait_for_common+0x9e/0x470 [ 1843.959309] ? _raw_spin_unlock_irq+0x24/0x80 [ 1843.963828] wait_for_common+0x29c/0x470 [ 1843.968555] ? __flush_work+0x37e/0x8b0 [ 1843.972521] ? bit_wait_io_timeout+0x100/0x100 [ 1843.977789] ? ___preempt_schedule+0x16/0x18 [ 1843.982201] ? wake_up_q+0xe0/0xe0 [ 1843.986452] ? ___preempt_schedule+0x16/0x18 [ 1843.990871] __flush_work+0x4bb/0x8b0 [ 1843.994672] ? alloc_unbound_pwq+0xc10/0xc10 [ 1843.999985] ? flush_workqueue_prep_pwqs+0x570/0x570 [ 1844.005100] ? _raw_spin_unlock_irq+0x5a/0x80 [ 1844.010233] ? __flush_work+0x4cf/0x8b0 [ 1844.014201] ? trace_hardirqs_off+0x64/0x200 [ 1844.019395] ? __cancel_work_timer+0x3ba/0x590 [ 1844.023981] __cancel_work_timer+0x412/0x590 [ 1844.029067] ? try_to_grab_pending+0x6f0/0x6f0 [ 1844.033673] ? lock_downgrade+0x720/0x720 [ 1844.038601] ? lock_acquire+0x170/0x3c0 [ 1844.042566] ? p9_fd_close+0x172/0x520 [ 1844.047087] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 1844.052185] p9_fd_close+0x305/0x520 [ 1844.056727] p9_client_create+0x901/0x12e0 [ 1844.060985] ? setup_fault_attr+0x200/0x200 [ 1844.065291] ? p9_client_flush+0x490/0x490 [ 1844.069632] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 1844.074668] ? __lockdep_init_map+0x100/0x5a0 [ 1844.079387] ? __raw_spin_lock_init+0x28/0x100 [ 1844.083988] v9fs_session_init+0x1dd/0x1770 [ 1844.088406] ? gfp_pfmemalloc_allowed+0x150/0x150 [ 1844.093267] ? v9fs_show_options+0x760/0x760 [ 1844.097718] ? setup_fault_attr+0x200/0x200 [ 1844.102063] ? lock_acquire+0x170/0x3c0 [ 1844.106133] ? check_preemption_disabled+0x41/0x280 [ 1844.111152] ? v9fs_mount+0x54/0x910 [ 1844.114865] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 1844.119945] ? kmem_cache_alloc_trace+0x323/0x380 [ 1844.124813] v9fs_mount+0x73/0x910 [ 1844.128460] ? alloc_pages_current+0x19b/0x2a0 [ 1844.133055] ? __lockdep_init_map+0x100/0x5a0 [ 1844.138284] mount_fs+0xa3/0x30c [ 1844.141687] vfs_kern_mount.part.0+0x68/0x470 [ 1844.147189] do_mount+0x113c/0x2f10 [ 1844.150825] ? do_raw_spin_unlock+0x171/0x230 [ 1844.155327] ? check_preemption_disabled+0x41/0x280 [ 1844.160989] ? copy_mount_string+0x40/0x40 [ 1844.165232] ? copy_mount_options+0x59/0x380 [ 1844.170528] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 1844.176154] ? kmem_cache_alloc_trace+0x323/0x380 [ 1844.181008] ? copy_mount_options+0x26f/0x380 [ 1844.185489] ksys_mount+0xcf/0x130 [ 1844.189677] __x64_sys_mount+0xba/0x150 [ 1844.193662] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 1844.198319] do_syscall_64+0xf9/0x620 [ 1844.202123] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1844.208108] RIP: 0033:0x45e229 [ 1844.211361] Code: Bad RIP value. [ 1844.214712] RSP: 002b:00007f08786e2c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 1844.223100] RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e229 [ 1844.231071] RDX: 0000000020000240 RSI: 0000000020000200 RDI: 0000000000000000 [ 1844.238417] RBP: 000000000119c1c8 R08: 0000000020000580 R09: 0000000000000000 [ 1844.245781] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c184 [ 1844.253056] R13: 00007ffdbb4686af R14: 00007f08786e39c0 R15: 000000000119c184 [ 1844.260404] [ 1844.260404] Showing all locks held in the system: [ 1844.267224] 1 lock held by khungtaskd/1565: [ 1844.271542] #0: 000000009dc0bd3c (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 [ 1844.280233] 1 lock held by in:imklog/7794: [ 1844.284493] #0: 000000005f2d566b (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 [ 1844.292714] 3 locks held by rs:main Q:Reg/7796: [ 1844.297433] #0: 00000000b9a33a88 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 [ 1844.305058] #1: 000000009dc0bd3c (rcu_read_lock){....}, at: update_curr+0x2c3/0x870 [ 1844.313023] #2: 00000000b3077514 (&sb->s_type->i_mutex_key#10){+.+.}, at: ext4_file_write_iter+0x21f/0xf20 [ 1844.323012] 2 locks held by kworker/0:3/8317: [ 1844.327569] #0: 00000000d83d644e ((wq_completion)"events"){+.+.}, at: process_one_work+0x767/0x1570 [ 1844.336908] #1: 0000000087866077 ((work_completion)(&m->wq)){+.+.}, at: process_one_work+0x79c/0x1570 [ 1844.346443] [ 1844.348067] ============================================= [ 1844.348067] [ 1844.355074] NMI backtrace for cpu 0 [ 1844.358782] CPU: 0 PID: 1565 Comm: khungtaskd Not tainted 4.19.163-syzkaller #0 [ 1844.366237] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1844.375576] Call Trace: [ 1844.378153] dump_stack+0x1fc/0x2fe [ 1844.381763] nmi_cpu_backtrace.cold+0x63/0xa2 [ 1844.386240] ? lapic_can_unplug_cpu.cold+0x39/0x39 [ 1844.391176] nmi_trigger_cpumask_backtrace+0x1a6/0x1eb [ 1844.396435] watchdog+0x991/0xe60 [ 1844.399870] ? reset_hung_task_detector+0x30/0x30 [ 1844.404692] kthread+0x33f/0x460 [ 1844.408039] ? kthread_park+0x180/0x180 [ 1844.411992] ret_from_fork+0x24/0x30 [ 1844.415999] Sending NMI from CPU 0 to CPUs 1: [ 1844.421122] NMI backtrace for cpu 1 [ 1844.421129] CPU: 1 PID: 4679 Comm: systemd-journal Not tainted 4.19.163-syzkaller #0 [ 1844.421135] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1844.421139] RIP: 0010:deref_stack_reg+0x168/0x1d0 [ 1844.421150] Code: b8 00 00 00 00 00 fc ff df 80 3c 02 00 75 4c 49 89 6d 00 b8 01 00 00 00 48 ba 00 00 00 00 00 fc ff df 48 c7 04 13 00 00 00 00 <48> 8b 4c 24 60 65 48 2b 0c 25 28 00 00 00 75 47 48 83 c4 68 5b 5d [ 1844.421154] RSP: 0018:ffff8880a14a7828 EFLAGS: 00000046 [ 1844.421163] RAX: 0000000000000001 RBX: 1ffff11014294f06 RCX: 0000000000000000 [ 1844.421168] RDX: dffffc0000000000 RSI: ffff8880a14a7850 RDI: ffff8880a14a7c98 [ 1844.421173] RBP: ffffffff81a96071 R08: ffffffff8b99b6de R09: ffffffff8b99b6df [ 1844.421178] R10: 0000000000074071 R11: 0000000000000001 R12: ffff8880a14a79a8 [ 1844.421184] R13: ffff8880a14a79f0 R14: ffff8880a14a0000 R15: ffff8880a14a79a8 [ 1844.421189] FS: 00007f37223368c0(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 [ 1844.421194] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1844.421199] CR2: 00007f371f71f000 CR3: 00000000a194d000 CR4: 00000000001406e0 [ 1844.421205] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1844.421210] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 1844.421213] Call Trace: [ 1844.421218] ? __read_once_size_nocheck.constprop.0+0x10/0x10 [ 1844.421221] ? putname+0xe1/0x120 [ 1844.421225] ? deref_stack_reg+0x1d0/0x1d0 [ 1844.421229] unwind_next_frame+0xec4/0x1c60 [ 1844.421233] ? kmem_cache_free+0x7f/0x260 [ 1844.421237] ? deref_stack_reg+0x1d0/0x1d0 [ 1844.421241] ? read_word_at_a_time+0x16/0x20 [ 1844.421245] ? kmem_cache_free+0x7f/0x260 [ 1844.421248] __save_stack_trace+0x9f/0x190 [ 1844.421252] ? putname+0xe1/0x120 [ 1844.421256] __kasan_slab_free+0x126/0x1f0 [ 1844.421259] ? kmem_cache_free+0x7f/0x260 [ 1844.421263] ? unlazy_walk+0x1a4/0x540 [ 1844.421267] ? lock_downgrade+0x720/0x720 [ 1844.421271] ? do_raw_spin_unlock+0x171/0x230 [ 1844.421275] ? debug_check_no_obj_freed+0x201/0x482 [ 1844.421279] ? lock_downgrade+0x720/0x720 [ 1844.421283] ? lock_acquire+0x170/0x3c0 [ 1844.421287] ? debug_check_no_obj_freed+0xb5/0x482 [ 1844.421291] ? trace_hardirqs_off+0x64/0x200 [ 1844.421295] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 1844.421300] ? debug_check_no_obj_freed+0x201/0x482 [ 1844.421303] ? putname+0xe1/0x120 [ 1844.421307] kmem_cache_free+0x7f/0x260 [ 1844.421310] putname+0xe1/0x120 [ 1844.421314] filename_lookup+0x3d0/0x5a0 [ 1844.421318] ? filename_parentat+0x590/0x590 [ 1844.421322] ? __phys_addr_symbol+0x2c/0x70 [ 1844.421326] ? __check_object_size+0x17b/0x3d1 [ 1844.421329] ? getname_flags+0x25b/0x590 [ 1844.421333] do_faccessat+0x248/0x7a0 [ 1844.421337] ? __ia32_sys_fallocate+0x140/0x140 [ 1844.421341] ? trace_hardirqs_off_caller+0x6e/0x210 [ 1844.421345] ? do_syscall_64+0x21/0x620 [ 1844.421348] do_syscall_64+0xf9/0x620 [ 1844.421353] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1844.421356] RIP: 0033:0x7f37215f29c7 [ 1844.421367] Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 [ 1844.421371] RSP: 002b:00007ffde64ad388 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 [ 1844.421380] RAX: ffffffffffffffda RBX: 00007ffde64b02a0 RCX: 00007f37215f29c7 [ 1844.421386] RDX: 00007f3722063a00 RSI: 0000000000000000 RDI: 0000557a375f89a3 [ 1844.421391] RBP: 00007ffde64ad3c0 R08: 0000000000000000 R09: 0000000000000000 [ 1844.421396] R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 [ 1844.421401] R13: 0000000000000000 R14: 00007ffde64b02a0 R15: 00007ffde64ad8b0 [ 1844.422259] Kernel panic - not syncing: hung_task: blocked tasks [ 1844.772334] CPU: 0 PID: 1565 Comm: khungtaskd Not tainted 4.19.163-syzkaller #0 [ 1844.779759] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1844.789103] Call Trace: [ 1844.791691] dump_stack+0x1fc/0x2fe [ 1844.795301] panic+0x26a/0x50e [ 1844.798483] ? __warn_printk+0xf3/0xf3 [ 1844.802355] ? lapic_can_unplug_cpu.cold+0x39/0x39 [ 1844.807264] ? ___preempt_schedule+0x16/0x18 [ 1844.811668] ? watchdog+0x991/0xe60 [ 1844.815291] ? nmi_trigger_cpumask_backtrace+0x15e/0x1eb [ 1844.820739] watchdog+0x9a2/0xe60 [ 1844.824197] ? reset_hung_task_detector+0x30/0x30 [ 1844.829035] kthread+0x33f/0x460 [ 1844.832398] ? kthread_park+0x180/0x180 [ 1844.836355] ret_from_fork+0x24/0x30 [ 1844.840628] Kernel Offset: disabled [ 1844.844249] Rebooting in 86400 seconds..