[ 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 '10.128.0.107' (ECDSA) to the list of known hosts. syzkaller login: [ 486.369208][ T8508] IPVS: ftp: loaded support on port[0] = 21 [ 486.461929][ T8508] chnl_net:caif_netlink_parms(): no params data found [ 486.520237][ T8508] bridge0: port 1(bridge_slave_0) entered blocking state [ 486.528804][ T8508] bridge0: port 1(bridge_slave_0) entered disabled state [ 486.538225][ T8508] device bridge_slave_0 entered promiscuous mode [ 486.547881][ T8508] bridge0: port 2(bridge_slave_1) entered blocking state [ 486.555671][ T8508] bridge0: port 2(bridge_slave_1) entered disabled state [ 486.563368][ T8508] device bridge_slave_1 entered promiscuous mode [ 486.584740][ T8508] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 486.596416][ T8508] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 486.619381][ T8508] team0: Port device team_slave_0 added [ 486.627552][ T8508] team0: Port device team_slave_1 added [ 486.645635][ T8508] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 486.652577][ T8508] 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. [ 486.679697][ T8508] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 486.693129][ T8508] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 486.700648][ T8508] 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. [ 486.727454][ T8508] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 486.755245][ T8508] device hsr_slave_0 entered promiscuous mode [ 486.761861][ T8508] device hsr_slave_1 entered promiscuous mode [ 486.861750][ T8508] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 486.871994][ T8508] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 486.882385][ T8508] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 486.894055][ T8508] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 486.919415][ T8508] bridge0: port 2(bridge_slave_1) entered blocking state [ 486.926602][ T8508] bridge0: port 2(bridge_slave_1) entered forwarding state [ 486.934403][ T8508] bridge0: port 1(bridge_slave_0) entered blocking state [ 486.941465][ T8508] bridge0: port 1(bridge_slave_0) entered forwarding state [ 486.988757][ T8508] 8021q: adding VLAN 0 to HW filter on device bond0 [ 487.001773][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 487.012871][ T17] bridge0: port 1(bridge_slave_0) entered disabled state [ 487.021466][ T17] bridge0: port 2(bridge_slave_1) entered disabled state [ 487.030355][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 487.043205][ T8508] 8021q: adding VLAN 0 to HW filter on device team0 [ 487.055510][ T8500] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 487.064232][ T8500] bridge0: port 1(bridge_slave_0) entered blocking state [ 487.071498][ T8500] bridge0: port 1(bridge_slave_0) entered forwarding state [ 487.084512][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 487.093023][ T17] bridge0: port 2(bridge_slave_1) entered blocking state [ 487.100186][ T17] bridge0: port 2(bridge_slave_1) entered forwarding state [ 487.125879][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 487.136640][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 487.145007][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 487.153663][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 487.166578][ T8718] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 487.177866][ T8508] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 487.198309][ T8718] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 487.206216][ T8718] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 487.221838][ T8508] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 487.241321][ T8718] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 487.263264][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 487.272581][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 487.281437][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 487.292367][ T8508] device veth0_vlan entered promiscuous mode [ 487.304784][ T8508] device veth1_vlan entered promiscuous mode [ 487.326160][ T8500] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 487.335032][ T8500] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 487.343209][ T8500] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 487.355854][ T8508] device veth0_macvtap entered promiscuous mode [ 487.366722][ T8508] device veth1_macvtap entered promiscuous mode [ 487.385322][ T8508] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 487.392855][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 487.403386][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 487.417079][ T8508] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 487.426654][ T8500] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 487.440091][ T8508] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 executing program [ 487.449075][ T8508] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 487.457894][ T8508] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 487.466684][ T8508] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 716.294567][ T1651] INFO: task kworker/0:2:8500 blocked for more than 143 seconds. [ 716.302480][ T1651] Not tainted 5.10.0-rc5-syzkaller #0 [ 716.324132][ T1651] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 716.332829][ T1651] task:kworker/0:2 state:D stack:26568 pid: 8500 ppid: 2 flags:0x00004000 [ 716.349810][ T1651] Workqueue: events mptcp_worker [ 716.355653][ T1651] Call Trace: [ 716.358971][ T1651] __schedule+0x893/0x2130 [ 716.363399][ T1651] ? io_schedule_timeout+0x140/0x140 [ 716.371738][ T1651] ? _raw_spin_unlock_irq+0x1f/0x40 [ 716.377937][ T1651] ? lockdep_hardirqs_on+0x79/0x100 [ 716.383143][ T1651] schedule+0xcf/0x270 [ 716.390425][ T1651] __lock_sock+0x13d/0x260 [ 716.396850][ T1651] ? sock_omalloc+0x180/0x180 [ 716.401545][ T1651] ? add_wait_queue_exclusive+0x180/0x180 [ 716.409890][ T1651] ? rwlock_bug.part.0+0x90/0x90 [ 716.415676][ T1651] lock_sock_nested+0xf1/0x110 [ 716.420479][ T1651] mptcp_worker+0xa6/0x17a0 [ 716.427806][ T1651] ? mptcp_sendmsg+0x27c0/0x27c0 [ 716.432751][ T1651] ? lock_downgrade+0x6d0/0x6d0 [ 716.438770][ T1651] process_one_work+0x933/0x15a0 [ 716.443723][ T1651] ? lock_release+0x710/0x710 [ 716.451046][ T1651] ? pwq_dec_nr_in_flight+0x320/0x320 [ 716.457329][ T1651] ? rwlock_bug.part.0+0x90/0x90 [ 716.462273][ T1651] ? _raw_spin_lock_irq+0x41/0x50 [ 716.469984][ T1651] worker_thread+0x64c/0x1120 [ 716.475503][ T1651] ? __kthread_parkme+0x13f/0x1e0 [ 716.480535][ T1651] ? process_one_work+0x15a0/0x15a0 [ 716.488454][ T1651] kthread+0x3b1/0x4a0 [ 716.492536][ T1651] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 716.499905][ T1651] ret_from_fork+0x1f/0x30 [ 716.506857][ T1651] [ 716.506857][ T1651] Showing all locks held in the system: [ 716.515556][ T1651] 1 lock held by khungtaskd/1651: [ 716.520586][ T1651] #0: ffffffff8b3378e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 716.537573][ T1651] 1 lock held by in:imklog/8181: [ 716.542530][ T1651] #0: ffff8880140b4370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 716.553124][ T1651] 2 locks held by kworker/0:2/8500: [ 716.560616][ T1651] #0: ffff888010064d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 [ 716.571980][ T1651] #1: ffffc900011cfda8 ((work_completion)(&msk->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 [ 716.585572][ T1651] 1 lock held by syz-executor456/8934: [ 716.591051][ T1651] [ 716.593375][ T1651] ============================================= [ 716.593375][ T1651] [ 716.603994][ T1651] NMI backtrace for cpu 0 [ 716.608567][ T1651] CPU: 0 PID: 1651 Comm: khungtaskd Not tainted 5.10.0-rc5-syzkaller #0 [ 716.616885][ T1651] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.626932][ T1651] Call Trace: [ 716.630225][ T1651] dump_stack+0x107/0x163 [ 716.634558][ T1651] nmi_cpu_backtrace.cold+0x44/0xd7 [ 716.639759][ T1651] ? lapic_can_unplug_cpu+0x80/0x80 [ 716.644955][ T1651] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 716.650934][ T1651] watchdog+0xd43/0xfa0 [ 716.655092][ T1651] ? reset_hung_task_detector+0x30/0x30 [ 716.660639][ T1651] kthread+0x3b1/0x4a0 [ 716.664712][ T1651] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 716.670607][ T1651] ret_from_fork+0x1f/0x30 [ 716.675091][ T1651] Sending NMI from CPU 0 to CPUs 1: [ 716.680971][ C1] NMI backtrace for cpu 1 [ 716.680978][ C1] CPU: 1 PID: 8934 Comm: syz-executor456 Not tainted 5.10.0-rc5-syzkaller #0 [ 716.680986][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.680990][ C1] RIP: 0010:lock_is_held_type+0x7e/0x100 [ 716.681004][ C1] Code: 85 c0 7f 0f eb 7a 83 c3 01 41 3b 9c 24 10 09 00 00 7d 6d 48 63 c3 48 89 ee 48 8d 04 80 4d 8d 7c c5 00 4c 89 ff e8 62 fc ff ff <85> c0 74 d8 41 83 fe ff 41 bc 01 00 00 00 74 12 41 0f b6 47 22 45 [ 716.681009][ C1] RSP: 0018:ffffc90001d4f430 EFLAGS: 00000046 [ 716.681019][ C1] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffffffff19d9fa3 [ 716.681025][ C1] RDX: 0000000000000000 RSI: ffffffff8b337820 RDI: ffff88801c043d98 [ 716.681030][ C1] RBP: ffffffff8b337820 R08: 0000000000000000 R09: ffffffff8ceccb4f [ 716.681036][ C1] R10: fffffbfff19d9969 R11: 0000000000000000 R12: ffff88801c043480 [ 716.681042][ C1] R13: ffff88801c043d98 R14: 00000000ffffffff R15: ffff88801c043d98 [ 716.681048][ C1] FS: 00007f059124a700(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 [ 716.681053][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 716.681059][ C1] CR2: 00000000006df0c0 CR3: 00000000117dc000 CR4: 00000000001506e0 [ 716.681065][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 716.681071][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 716.681073][ C1] Call Trace: [ 716.681078][ C1] rcu_read_lock_sched_held+0x3a/0x70 [ 716.681081][ C1] lock_acquire+0x5c9/0x740 [ 716.681085][ C1] ? lock_release+0x710/0x710 [ 716.681089][ C1] __might_fault+0x106/0x180 [ 716.681093][ C1] ? __might_fault+0xa3/0x180 [ 716.681096][ C1] _copy_to_iter+0x3be/0xf80 [ 716.681100][ C1] ? mark_lock+0xf7/0x1730 [ 716.681104][ C1] ? iov_iter_zero+0xe40/0xe40 [ 716.681108][ C1] ? release_sock+0x1b/0x1b0 [ 716.681112][ C1] ? __check_object_size+0x30/0x3f0 [ 716.681116][ C1] simple_copy_to_iter+0x4c/0x70 [ 716.681119][ C1] __skb_datagram_iter+0x4a2/0x760 [ 716.681124][ C1] ? zerocopy_sg_from_iter+0x110/0x110 [ 716.681128][ C1] skb_copy_datagram_iter+0x40/0x50 [ 716.681132][ C1] mptcp_recvmsg+0x571/0x20a0 [ 716.681136][ C1] ? mptcp_stream_accept+0xdd0/0xdd0 [ 716.681140][ C1] ? __init_waitqueue_head+0x110/0x110 [ 716.681144][ C1] ? aa_sk_perm+0x316/0xaa0 [ 716.681147][ C1] inet6_recvmsg+0x11b/0x5d0 [ 716.681152][ C1] ? inet6_sk_rebuild_header+0xc80/0xc80 [ 716.681156][ C1] ? bpf_lsm_socket_recvmsg+0x5/0x10 [ 716.681160][ C1] ? security_socket_recvmsg+0x8f/0xc0 [ 716.681164][ C1] ? inet6_sk_rebuild_header+0xc80/0xc80 [ 716.681168][ C1] ____sys_recvmsg+0x2c4/0x600 [ 716.681173][ C1] ? move_addr_to_kernel.part.0+0x110/0x110 [ 716.681177][ C1] ? __import_iovec+0x293/0x500 [ 716.681181][ C1] ? import_iovec+0x10c/0x150 [ 716.681185][ C1] ___sys_recvmsg+0x127/0x200 [ 716.681189][ C1] ? __copy_msghdr_from_user+0x4b0/0x4b0 [ 716.681193][ C1] ? __fget_files+0x272/0x400 [ 716.681197][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 716.681200][ C1] ? __fget_files+0x294/0x400 [ 716.681204][ C1] ? __fget_light+0xea/0x280 [ 716.681208][ C1] do_recvmmsg+0x24d/0x6c0 [ 716.681212][ C1] ? ___sys_recvmsg+0x200/0x200 [ 716.681216][ C1] ? mptcp_alloc_tx_skb+0x4c0/0x4c0 [ 716.681220][ C1] ? bpf_lsm_socket_connect+0x5/0x10 [ 716.681224][ C1] ? security_socket_connect+0x83/0xb0 [ 716.681228][ C1] ? mptcp_alloc_tx_skb+0x4c0/0x4c0 [ 716.681232][ C1] __x64_sys_recvmmsg+0x20b/0x260 [ 716.681237][ C1] ? __do_sys_socketcall+0x590/0x590 [ 716.681241][ C1] ? syscall_enter_from_user_mode+0x1d/0x50 [ 716.681245][ C1] do_syscall_64+0x2d/0x70 [ 716.681249][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 716.681253][ C1] RIP: 0033:0x4499d9 [ 716.681266][ C1] Code: e8 cc 0c 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 5b 04 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 716.681270][ C1] RSP: 002b:00007f0591249db8 EFLAGS: 00000246 ORIG_RAX: 000000000000012b [ 716.681281][ C1] RAX: ffffffffffffffda RBX: 00000000006dfc28 RCX: 00000000004499d9 [ 716.681286][ C1] RDX: 0000000000000001 RSI: 0000000020005a80 RDI: 0000000000000003 [ 716.681291][ C1] RBP: 00000000006dfc20 R08: 0000000000000000 R09: 0000000000000000 [ 716.681296][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dfc2c [ 716.681301][ C1] R13: 00007ffc9a14b72f R14: 00007f059124a9c0 R15: 00000000006dfc2c [ 716.721769][ T1651] Kernel panic - not syncing: hung_task: blocked tasks [ 717.116559][ T1651] CPU: 0 PID: 1651 Comm: khungtaskd Not tainted 5.10.0-rc5-syzkaller #0 [ 717.124874][ T1651] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 717.134920][ T1651] Call Trace: [ 717.138215][ T1651] dump_stack+0x107/0x163 [ 717.142544][ T1651] panic+0x306/0x73d [ 717.146465][ T1651] ? __warn_printk+0xf3/0xf3 [ 717.151058][ T1651] ? lapic_can_unplug_cpu+0x80/0x80 [ 717.156258][ T1651] ? preempt_schedule_thunk+0x16/0x18 [ 717.161632][ T1651] ? watchdog.cold+0x5/0x158 [ 717.166227][ T1651] ? watchdog+0xa80/0xfa0 [ 717.170561][ T1651] watchdog.cold+0x16/0x158 [ 717.175197][ T1651] ? reset_hung_task_detector+0x30/0x30 [ 717.180754][ T1651] kthread+0x3b1/0x4a0 [ 717.184837][ T1651] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 717.190737][ T1651] ret_from_fork+0x1f/0x30 [ 717.196004][ T1651] Kernel Offset: disabled [ 717.200341][ T1651] Rebooting in 86400 seconds..