Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 16.631438] cfg80211: Calling CRDA to update world regulatory domain [ 19.791433] cfg80211: Calling CRDA to update world regulatory domain [ 22.951427] cfg80211: Calling CRDA to update world regulatory domain [ 26.111425] cfg80211: Calling CRDA to update world regulatory domain [ 29.271430] cfg80211: Calling CRDA to update world regulatory domain [ 29.781578] IPVS: Creating netns size=2688 id=1 [ 29.786298] IPVS: ftp: loaded support on port[0] = 21 [ 32.431442] cfg80211: Calling CRDA to update world regulatory domain [ 35.591415] cfg80211: Calling CRDA to update world regulatory domain Warning: Permanently added '10.128.0.244' (ECDSA) to the list of known hosts. 2019/11/29 17:46:54 parsed 1 programs 2019/11/29 17:46:55 executed programs: 0 [ 37.151838] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 37.161059] IPVS: Creating netns size=2688 id=2 [ 37.162797] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 37.170650] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 37.176240] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 37.179189] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 37.182164] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 37.197437] IPVS: ftp: loaded support on port[0] = 21 [ 37.209900] IPVS: Creating netns size=2688 id=3 [ 37.216707] IPVS: ftp: loaded support on port[0] = 21 [ 37.218444] chnl_net:caif_netlink_parms(): no params data found [ 37.228005] device bridge_slave_0 entered promiscuous mode [ 37.228585] device bridge_slave_1 entered promiscuous mode [ 37.230901] IPv6: ADDRCONF(NETDEV_UP): bond_slave_0: link is not ready [ 37.231236] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 37.253870] IPv6: ADDRCONF(NETDEV_UP): bond_slave_1: link is not ready [ 37.260648] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 37.274553] IPVS: Creating netns size=2688 id=4 [ 37.279676] IPVS: ftp: loaded support on port[0] = 21 [ 37.284729] chnl_net:caif_netlink_parms(): no params data found [ 37.295968] device bridge_slave_0 entered promiscuous mode [ 37.301997] device bridge_slave_1 entered promiscuous mode [ 37.313163] IPv6: ADDRCONF(NETDEV_UP): bond_slave_0: link is not ready [ 37.319950] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 37.330783] IPVS: Creating netns size=2688 id=5 [ 37.335695] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 37.337450] IPVS: ftp: loaded support on port[0] = 21 [ 37.349390] IPv6: ADDRCONF(NETDEV_UP): bond_slave_1: link is not ready [ 37.356218] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 37.368857] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 37.380039] chnl_net:caif_netlink_parms(): no params data found [ 37.390236] IPVS: Creating netns size=2688 id=6 [ 37.395066] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 37.398420] IPVS: ftp: loaded support on port[0] = 21 [ 37.408312] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 37.419525] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 37.428071] chnl_net:caif_netlink_parms(): no params data found [ 37.437545] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 37.444986] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 37.454009] IPVS: Creating netns size=2688 id=7 [ 37.454185] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 37.466352] IPVS: ftp: loaded support on port[0] = 21 [ 37.466353] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 37.467430] bridge0: port 2(bridge_slave_1) entered forwarding state [ 37.467513] bridge0: port 2(bridge_slave_1) entered forwarding state [ 37.467524] bridge0: port 1(bridge_slave_0) entered forwarding state [ 37.467532] bridge0: port 1(bridge_slave_0) entered forwarding state [ 37.504104] bridge0: port 1(bridge_slave_0) entered disabled state [ 37.510563] bridge0: port 2(bridge_slave_1) entered disabled state [ 37.526064] device bridge_slave_0 entered promiscuous mode [ 37.532053] device bridge_slave_1 entered promiscuous mode [ 37.546725] IPv6: ADDRCONF(NETDEV_UP): bond_slave_0: link is not ready [ 37.553557] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 37.561992] device bridge_slave_0 entered promiscuous mode [ 37.568107] 8021q: adding VLAN 0 to HW filter on device bond0 [ 37.575366] chnl_net:caif_netlink_parms(): no params data found [ 37.582240] IPv6: ADDRCONF(NETDEV_UP): bond_slave_1: link is not ready [ 37.589039] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 37.597030] device bridge_slave_1 entered promiscuous mode [ 37.606892] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 37.618500] IPv6: ADDRCONF(NETDEV_UP): bond_slave_0: link is not ready [ 37.627009] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 37.635164] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 37.645498] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 37.653045] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 37.662271] IPv6: ADDRCONF(NETDEV_UP): bond_slave_1: link is not ready [ 37.669052] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 37.679509] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 37.689443] device bridge_slave_0 entered promiscuous mode [ 37.695520] 8021q: adding VLAN 0 to HW filter on device bond0 [ 37.702671] chnl_net:caif_netlink_parms(): no params data found [ 37.709199] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 37.716457] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 37.724150] bridge0: port 1(bridge_slave_0) entered forwarding state [ 37.730627] bridge0: port 1(bridge_slave_0) entered forwarding state [ 37.737774] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 37.745103] bridge0: port 2(bridge_slave_1) entered forwarding state [ 37.751591] bridge0: port 2(bridge_slave_1) entered forwarding state [ 37.758200] IPv6: ADDRCONF(NETDEV_CHANGE): bridge0: link becomes ready [ 37.765240] device bridge_slave_1 entered promiscuous mode [ 37.772716] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 37.781207] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 37.788421] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 37.794671] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 37.803018] IPv6: ADDRCONF(NETDEV_UP): bond_slave_0: link is not ready [ 37.809784] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 37.818057] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 37.825595] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 37.832614] IPv6: ADDRCONF(NETDEV_UP): bond_slave_1: link is not ready [ 37.839359] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 37.851857] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 37.866819] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 37.874032] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 37.881727] device bridge_slave_0 entered promiscuous mode [ 37.889184] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 37.896173] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 37.903266] device bridge_slave_1 entered promiscuous mode [ 37.909023] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 37.916685] bridge0: port 1(bridge_slave_0) entered forwarding state [ 37.923183] bridge0: port 1(bridge_slave_0) entered forwarding state [ 37.929953] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 37.937314] bridge0: port 2(bridge_slave_1) entered forwarding state [ 37.943801] bridge0: port 2(bridge_slave_1) entered forwarding state [ 37.950812] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 37.957831] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 37.965931] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 37.975482] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 37.982585] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 37.989633] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 37.996939] 8021q: adding VLAN 0 to HW filter on device bond0 [ 38.003364] IPv6: ADDRCONF(NETDEV_UP): bond_slave_0: link is not ready [ 38.010230] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 38.020074] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 38.026578] IPv6: ADDRCONF(NETDEV_UP): bond_slave_1: link is not ready [ 38.033593] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 38.042585] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 38.052263] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 38.058876] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 38.069302] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 38.078662] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 38.093781] 8021q: adding VLAN 0 to HW filter on device bond0 [ 38.101654] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 38.108084] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 38.119224] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 38.130133] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 38.138025] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 38.146082] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 38.153615] bridge0: port 1(bridge_slave_0) entered forwarding state [ 38.160091] bridge0: port 1(bridge_slave_0) entered forwarding state [ 38.166805] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 38.174299] bridge0: port 2(bridge_slave_1) entered forwarding state [ 38.180774] bridge0: port 2(bridge_slave_1) entered forwarding state [ 38.187675] IPv6: ADDRCONF(NETDEV_CHANGE): bridge0: link becomes ready [ 38.195903] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 38.207154] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 38.215476] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 38.222567] 8021q: adding VLAN 0 to HW filter on device bond0 [ 38.228715] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 38.236364] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 38.244322] bridge0: port 1(bridge_slave_0) entered forwarding state [ 38.250918] bridge0: port 1(bridge_slave_0) entered forwarding state [ 38.257596] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 38.264981] bridge0: port 2(bridge_slave_1) entered forwarding state [ 38.271473] bridge0: port 2(bridge_slave_1) entered forwarding state [ 38.278145] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 38.286349] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 52.761531] bridge0: port 1(bridge_slave_0) entered forwarding state [ 52.801363] bridge0: port 2(bridge_slave_1) entered forwarding state [ 52.971356] bridge0: port 1(bridge_slave_0) entered forwarding state [ 52.977882] bridge0: port 2(bridge_slave_1) entered forwarding state [ 53.201356] bridge0: port 1(bridge_slave_0) entered forwarding state [ 53.207873] bridge0: port 2(bridge_slave_1) entered forwarding state [ 53.291349] bridge0: port 1(bridge_slave_0) entered forwarding state [ 53.297878] bridge0: port 2(bridge_slave_1) entered forwarding state [ 282.301411] INFO: task kworker/1:1:627 blocked for more than 140 seconds. [ 282.308382] Not tainted 4.1.0-syzkaller #0 [ 282.313247] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 282.321284] kworker/1:1 D ffff88012a8f7c28 13192 627 2 0x00000000 [ 282.328786] Workqueue: ipv6_addrconf addrconf_dad_work [ 282.334296] ffff88012a8f7c28 000000002a8f7c28 ffff88012a8f0650 ffff880100000000 [ 282.342368] ffff88012a8f8000 ffffffff83397688 ffff8800b39aea00 ffff88012a8f0650 [ 282.350403] 0000000000000286 ffff88012a8f7c48 ffffffff82642472 ffffffff83397680 [ 282.358605] Call Trace: [ 282.361182] [] schedule+0x32/0x80 [ 282.366367] [] schedule_preempt_disabled+0x13/0x20 [ 282.372951] [] mutex_lock_nested+0x195/0x610 [ 282.378993] [] ? rtnl_lock+0x12/0x20 [ 282.384436] [] ? mutex_unlock+0x9/0x10 [ 282.389974] [] ? debug_lockdep_rcu_enabled+0x1d/0x20 [ 282.396834] [] rtnl_lock+0x12/0x20 [ 282.402011] [] addrconf_dad_work+0x28/0x330 [ 282.407965] [] process_one_work+0x214/0x8d0 [ 282.414015] [] ? process_one_work+0x177/0x8d0 [ 282.420164] [] worker_thread+0x4b/0x470 [ 282.425778] [] ? process_one_work+0x8d0/0x8d0 [ 282.431912] [] ? process_one_work+0x8d0/0x8d0 [ 282.438035] [] kthread+0xea/0x100 [ 282.443128] [] ? kthread_create_on_node+0x210/0x210 [ 282.449773] [] ret_from_fork+0x42/0x70 [ 282.455303] [] ? kthread_create_on_node+0x210/0x210 [ 282.462122] 3 locks held by kworker/1:1/627: [ 282.466513] #0: ("%s"("ipv6_addrconf")){.+.+..}, at: [] process_one_work+0x177/0x8d0 [ 282.476819] #1: ((&(&ifa->dad_work)->work)){+.+...}, at: [] process_one_work+0x177/0x8d0 [ 282.487468] #2: (rtnl_mutex){+.+.+.}, at: [] rtnl_lock+0x12/0x20 [ 282.496024] sending NMI to all CPUs: [ 282.500783] NMI backtrace for cpu 0 [ 282.504399] CPU: 0 PID: 5691 Comm: syz-executor.3 Not tainted 4.1.0-syzkaller #0 [ 282.511919] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 282.521251] task: ffff8800b642e890 ti: ffff8800aefbc000 task.ti: ffff8800aefbc000 [ 282.528856] RIP: 0010:[] [] mark_held_locks+0x69/0xc0 [ 282.537241] RSP: 0018:ffff8800aefbf8d8 EFLAGS: 00000097 [ 282.542704] RAX: 0000000000000004 RBX: 0000000000000000 RCX: 0000000000000002 [ 282.549958] RDX: 0000000000000006 RSI: ffff8800b642f0f8 RDI: ffff8800b642e890 [ 282.557212] RBP: ffff8800aefbf908 R08: 0000000000000001 R09: 0000000000000000 [ 282.564473] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000007 [ 282.571740] R13: ffff8800b642e890 R14: 0000000000000006 R15: ffff8800b642f0f8 [ 282.578990] FS: 00007f1397880700(0000) GS:ffff88012c000000(0000) knlGS:0000000000000000 [ 282.587203] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 282.593073] CR2: 0000000002962978 CR3: 00000000b39ac000 CR4: 00000000001407f0 [ 282.600320] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 282.607578] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 282.614837] Stack: [ 282.616966] ffff8800b39a6000 ffff8800b642e890 ffffffff812daeed 0000000000000286 [ 282.624486] ffff88012bc00700 0000000000000000 ffff8800aefbf928 ffffffff811c4a35 [ 282.632004] ffff88012c01ea90 ffff8800aff68000 ffff8800aefbf938 ffffffff811c4aed [ 282.639512] Call Trace: [ 282.642092] [] ? kfree+0x1ad/0x4b0 [ 282.647256] [] trace_hardirqs_on_caller+0x155/0x200 [ 282.653904] [] trace_hardirqs_on+0xd/0x10 [ 282.659677] [] kfree+0x1ad/0x4b0 [ 282.664677] [] ? __kmalloc_reserve.isra.26+0x2c/0x90 [ 282.671410] [] skb_free_head+0x19/0x60 [ 282.676923] [] pskb_expand_head+0xd8/0x260 [ 282.682794] [] netlink_trim+0x91/0xd0 [ 282.688223] [] netlink_unicast+0x39/0x2e0 [ 282.694009] [] rtnetlink_send+0x4d/0x80 [ 282.699611] [] tc_ctl_action+0x176/0x240 [ 282.705324] [] rtnetlink_rcv_msg+0x83/0x230 [ 282.711273] [] ? mutex_lock_nested+0x32e/0x610 [ 282.717494] [] ? rtnetlink_rcv+0x1a/0x40 [ 282.723187] [] ? rtnetlink_rcv+0x40/0x40 [ 282.728874] [] netlink_rcv_skb+0xa9/0xd0 [ 282.734575] [] rtnetlink_rcv+0x29/0x40 [ 282.740095] [] netlink_unicast+0x1ca/0x2e0 [ 282.745971] [] ? netlink_unicast+0x148/0x2e0 [ 282.752012] [] netlink_sendmsg+0x310/0x3d0 [ 282.757876] [] sock_sendmsg+0x35/0x40 [ 282.763329] [] ___sys_sendmsg+0x2c3/0x2d0 [ 282.769106] [] ? debug_lockdep_rcu_enabled+0x1d/0x20 [ 282.775846] [] ? __fget+0x10b/0x210 [ 282.781102] [] ? expand_files+0x270/0x270 [ 282.786994] [] ? __local_bh_enable_ip+0x7d/0x140 [ 282.793405] [] ? __fget_light+0x25/0x90 [ 282.799008] [] __sys_sendmsg+0x3d/0x80 [ 282.804538] [] SyS_sendmsg+0xd/0x20 [ 282.809801] [] system_call_fastpath+0x16/0x7a [ 282.815951] Code: 66 90 83 c3 01 41 39 9d 60 08 00 00 7e 4c 48 63 c3 44 89 f2 48 8d 04 80 49 8d 34 c7 0f b6 46 22 a8 03 41 0f 45 d4 83 fa 0c 77 27 04 74 d3 4c 89 ef e8 3b f8 ff ff 85 c0 75 c7 48 83 c4 08 5b [ 282.836241] NMI backtrace for cpu 1 [ 282.839864] CPU: 1 PID: 867 Comm: khungtaskd Not tainted 4.1.0-syzkaller #0 [ 282.846957] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 282.856299] task: ffff88012adde990 ti: ffff88012a88c000 task.ti: ffff88012a88c000 [ 282.863911] RIP: 0010:[] [] native_write_msr_safe+0xa/0x10 [ 282.872765] RSP: 0018:ffff88012a88fd08 EFLAGS: 00000082 [ 282.878191] RAX: 0000000000000400 RBX: 0000000000000001 RCX: 0000000000000830 [ 282.885451] RDX: 0000000000000001 RSI: 0000000000000400 RDI: 0000000000000830 [ 282.892721] RBP: ffff88012a88fd08 R08: 0000000000000000 R09: 0000000000000003 [ 282.899974] R10: ffff88012adde990 R11: 0000000000000001 R12: ffffffff8341a8c8 [ 282.907237] R13: 0000000000080000 R14: 0000000000000001 R15: 000000000000a120 [ 282.914494] FS: 0000000000000000(0000) GS:ffff88012c100000(0000) knlGS:0000000000000000 [ 282.922714] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 282.928579] CR2: 00007fff1c556fe8 CR3: 0000000128c17000 CR4: 00000000001407e0 [ 282.935863] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 282.943123] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 282.950373] Stack: [ 282.952512] ffff88012a88fd68 ffffffff810c517f ffff88012a88fd78 0000000000000296 [ 282.960022] 000000020000000a 0000000000000002 ffff88012a88fd88 0000000000000040 [ 282.967548] 000000000000d3c0 0000000000000001 ffff88012a8f0650 000000000000008c [ 282.975067] Call Trace: [ 282.977630] [] __x2apic_send_IPI_mask+0x10f/0x1a0 [ 282.984111] [] x2apic_send_IPI_mask+0xe/0x10 [ 282.990147] [] arch_trigger_all_cpu_backtrace+0x33d/0x350 [ 282.997322] [] ? lockdep_print_held_locks+0x77/0xe0 [ 283.003973] [] watchdog+0x47e/0x6c0 [ 283.009228] [] ? watchdog+0x8a/0x6c0 [ 283.014580] [] ? __schedule+0x388/0x9e0 [ 283.020181] [] ? reset_hung_task_detector+0x10/0x10 [ 283.026835] [] kthread+0xea/0x100 [ 283.031924] [] ? kthread_create_on_node+0x210/0x210 [ 283.038573] [] ret_from_fork+0x42/0x70 [ 283.044100] [] ? kthread_create_on_node+0x210/0x210 [ 283.050871] Code: 00 55 89 f9 48 89 e5 0f 32 45 31 c0 48 89 d7 44 89 06 89 c6 5d 48 c1 e7 20 48 89 f8 48 09 f0 c3 90 55 89 f0 89 f9 48 89 e5 0f 30 <31> c0 5d c3 66 90 55 89 f9 48 89 e5 0f 33 48 89 d7 89 c1 5d 48 [ 283.070152] Kernel panic - not syncing: hung_task: blocked tasks [ 283.076287] CPU: 1 PID: 867 Comm: khungtaskd Not tainted 4.1.0-syzkaller #0 [ 283.083464] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 283.092800] 00000000003fffea ffff88012a88fd58 ffffffff8263a09b 0000000000000034 [ 283.100837] ffffffff82e376f4 ffff88012a88fdd8 ffffffff82635f2e 0000000000000001 [ 283.108881] 0000000000000008 ffff88012a88fde8 ffff88012a88fd88 0000000000000005 [ 283.116903] Call Trace: [ 283.119472] [] dump_stack+0x4f/0x7b [ 283.124725] [] panic+0xcd/0x211 [ 283.129644] [] watchdog+0x48c/0x6c0 [ 283.134899] [] ? watchdog+0x8a/0x6c0 [ 283.140241] [] ? __schedule+0x388/0x9e0 [ 283.145929] [] ? reset_hung_task_detector+0x10/0x10 [ 283.152589] [] kthread+0xea/0x100 [ 283.157936] [] ? kthread_create_on_node+0x210/0x210 [ 283.164581] [] ret_from_fork+0x42/0x70 [ 283.170094] [] ? kthread_create_on_node+0x210/0x210 [ 283.178128] Kernel Offset: disabled