[ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.22' (ECDSA) to the list of known hosts. syzkaller login: [ 305.062678][ T27] audit: type=1400 audit(1598782643.526:8): avc: denied { execmem } for pid=6875 comm="syz-executor155" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 305.087946][ T6876] IPVS: ftp: loaded support on port[0] = 21 [ 305.180136][ T6876] chnl_net:caif_netlink_parms(): no params data found [ 305.235136][ T6876] bridge0: port 1(bridge_slave_0) entered blocking state [ 305.242730][ T6876] bridge0: port 1(bridge_slave_0) entered disabled state [ 305.251281][ T6876] device bridge_slave_0 entered promiscuous mode [ 305.260643][ T6876] bridge0: port 2(bridge_slave_1) entered blocking state [ 305.267964][ T6876] bridge0: port 2(bridge_slave_1) entered disabled state [ 305.278405][ T6876] device bridge_slave_1 entered promiscuous mode [ 305.299824][ T6876] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 305.310987][ T6876] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 305.336158][ T6876] team0: Port device team_slave_0 added [ 305.343665][ T6876] team0: Port device team_slave_1 added [ 305.361903][ T6876] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 305.368971][ T6876] 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. [ 305.394988][ T6876] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 305.408202][ T6876] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 305.415245][ T6876] 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. [ 305.441228][ T6876] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 305.468628][ T6876] device hsr_slave_0 entered promiscuous mode [ 305.475458][ T6876] device hsr_slave_1 entered promiscuous mode [ 305.583145][ T6876] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 305.593885][ T6876] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 305.604506][ T6876] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 305.615817][ T6876] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 305.642567][ T6876] bridge0: port 2(bridge_slave_1) entered blocking state [ 305.650456][ T6876] bridge0: port 2(bridge_slave_1) entered forwarding state [ 305.658716][ T6876] bridge0: port 1(bridge_slave_0) entered blocking state [ 305.665880][ T6876] bridge0: port 1(bridge_slave_0) entered forwarding state [ 305.717261][ T6876] 8021q: adding VLAN 0 to HW filter on device bond0 [ 305.731058][ T2585] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 305.742454][ T2585] bridge0: port 1(bridge_slave_0) entered disabled state [ 305.751887][ T2585] bridge0: port 2(bridge_slave_1) entered disabled state [ 305.760210][ T2585] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 305.773393][ T6876] 8021q: adding VLAN 0 to HW filter on device team0 [ 305.786091][ T2580] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 305.796249][ T2580] bridge0: port 1(bridge_slave_0) entered blocking state [ 305.803323][ T2580] bridge0: port 1(bridge_slave_0) entered forwarding state [ 305.824870][ T2585] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 305.833393][ T2585] bridge0: port 2(bridge_slave_1) entered blocking state [ 305.840546][ T2585] bridge0: port 2(bridge_slave_1) entered forwarding state [ 305.855448][ T2585] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 305.864588][ T2585] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 305.873960][ T7082] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 305.884696][ T2580] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 305.898786][ T6876] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 305.910548][ T6876] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 305.921100][ T2580] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 305.939427][ T7082] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 305.947123][ T7082] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 305.961565][ T6876] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 305.981396][ T2580] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 306.002193][ T7082] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 306.011098][ T7082] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 306.020406][ T7082] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 306.031954][ T6876] device veth0_vlan entered promiscuous mode [ 306.044936][ T6876] device veth1_vlan entered promiscuous mode [ 306.068063][ T2580] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 306.076689][ T2580] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 306.085806][ T2580] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 306.098862][ T6876] device veth0_macvtap entered promiscuous mode [ 306.109247][ T6876] device veth1_macvtap entered promiscuous mode [ 306.128156][ T6876] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 306.136227][ T7082] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 306.148605][ T7082] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 306.160403][ T6876] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 306.169770][ T2580] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 306.178949][ T2580] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 306.191206][ T6876] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 306.205636][ T6876] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 306.216322][ T6876] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 executing program [ 306.226472][ T6876] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 306.381661][ C1] TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. [ 336.056644][ T0] NOHZ: local_softirq_pending 08 [ 356.536105][ T0] NOHZ: local_softirq_pending 08 [ 397.495829][ T0] NOHZ: local_softirq_pending 08 [ 417.975282][ T0] NOHZ: local_softirq_pending 08 [ 454.454504][ T1168] INFO: task syz-executor155:6876 blocked for more than 143 seconds. [ 454.462774][ T1168] Not tainted 5.9.0-rc2-syzkaller #0 [ 454.472219][ T1168] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 454.485970][ T1168] task:syz-executor155 state:D stack:23536 pid: 6876 ppid: 6875 flags:0x00000000 [ 454.495770][ T1168] Call Trace: [ 454.499171][ T1168] __schedule+0x8e5/0x21e0 [ 454.503704][ T1168] ? io_schedule_timeout+0x140/0x140 [ 454.510176][ T1168] schedule+0xd0/0x2a0 [ 454.514432][ T1168] schedule_timeout+0x1d8/0x250 [ 454.519304][ T1168] ? usleep_range+0x170/0x170 [ 454.524064][ T1168] ? mark_held_locks+0x9f/0xe0 [ 454.529988][ T1168] ? _raw_spin_unlock_irq+0x1f/0x80 [ 454.535359][ T1168] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 454.541417][ T1168] ? trace_hardirqs_on+0x5f/0x220 [ 454.547547][ T1168] wait_for_completion+0x163/0x260 [ 454.552679][ T1168] ? wait_for_completion_interruptible+0x2e0/0x2e0 [ 454.559277][ T1168] ? _raw_spin_unlock_irq+0x1f/0x80 [ 454.565201][ T1168] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 454.571301][ T1168] __flush_work+0x51f/0xab0 [ 454.575895][ T1168] ? queue_work_node+0x370/0x370 [ 454.580950][ T1168] ? debug_object_init_on_stack+0x20/0x20 [ 454.587855][ T1168] ? flush_workqueue_prep_pwqs+0x4f0/0x4f0 [ 454.593674][ T1168] ? mark_held_locks+0x9f/0xe0 [ 454.599323][ T1168] ? __cancel_work_timer+0x516/0x700 [ 454.605394][ T1168] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 454.611472][ T1168] __cancel_work_timer+0x5de/0x700 [ 454.616660][ T1168] ? try_to_grab_pending.part.0+0x7d0/0x7d0 [ 454.622565][ T1168] ? lock_acquire+0x1f1/0xad0 [ 454.628365][ T1168] ? __sock_release+0x86/0x280 [ 454.633127][ T1168] ? lock_release+0x8e0/0x8e0 [ 454.637958][ T1168] tls_sk_proto_close+0x4a7/0xaf0 [ 454.642993][ T1168] ? wait_on_pending_writer+0x3f0/0x3f0 [ 454.649700][ T1168] ? ip_mc_drop_socket+0x16/0x260 [ 454.654795][ T1168] inet_release+0x12e/0x280 [ 454.659368][ T1168] inet6_release+0x4c/0x70 [ 454.663770][ T1168] __sock_release+0xcd/0x280 [ 454.669482][ T1168] sock_close+0x18/0x20 [ 454.673737][ T1168] __fput+0x285/0x920 [ 454.677789][ T1168] ? __sock_release+0x280/0x280 [ 454.682737][ T1168] task_work_run+0xdd/0x190 [ 454.688353][ T1168] exit_to_user_mode_prepare+0x195/0x1c0 [ 454.694020][ T1168] syscall_exit_to_user_mode+0x59/0x2b0 [ 454.699652][ T1168] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 454.705728][ T1168] RIP: 0033:0x403950 [ 454.709619][ T1168] Code: Bad RIP value. [ 454.713664][ T1168] RSP: 002b:00007ffd885383a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 454.722899][ T1168] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000403950 [ 454.731467][ T1168] RDX: 00000000000000d8 RSI: 00000000200005c0 RDI: 0000000000000004 [ 454.739551][ T1168] RBP: 00007ffd885383b0 R08: 0000000000000000 R09: 00000000000000d8 [ 454.747635][ T1168] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd885383c0 [ 454.755684][ T1168] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 454.763704][ T1168] [ 454.763704][ T1168] Showing all locks held in the system: [ 454.771535][ T1168] 1 lock held by khungtaskd/1168: [ 454.776649][ T1168] #0: ffffffff89bd6900 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 454.786730][ T1168] 1 lock held by syz-executor155/6876: [ 454.792192][ T1168] #0: ffff888083010210 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: __sock_release+0x86/0x280 [ 454.802974][ T1168] 3 locks held by kworker/0:3/7082: [ 454.808251][ T1168] #0: ffff8880aa063d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 454.818733][ T1168] #1: ffffc90001b07da8 ((work_completion)(&(&sw_ctx_tx->tx_work.work)->work)){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 454.832054][ T1168] #2: ffff88809d8e60d8 (&ctx->tx_lock){+.+.}-{3:3}, at: tx_work_handler+0x127/0x190 [ 454.841719][ T1168] [ 454.844049][ T1168] ============================================= [ 454.844049][ T1168] [ 454.852582][ T1168] NMI backtrace for cpu 1 [ 454.857019][ T1168] CPU: 1 PID: 1168 Comm: khungtaskd Not tainted 5.9.0-rc2-syzkaller #0 [ 454.865292][ T1168] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 454.875362][ T1168] Call Trace: [ 454.878825][ T1168] dump_stack+0x18f/0x20d [ 454.883196][ T1168] nmi_cpu_backtrace.cold+0x70/0xb1 [ 454.888455][ T1168] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 454.894178][ T1168] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 454.900342][ T1168] watchdog+0xd7d/0x1000 [ 454.905143][ T1168] ? reset_hung_task_detector+0x30/0x30 [ 454.910700][ T1168] kthread+0x3b5/0x4a0 [ 454.914764][ T1168] ? __kthread_bind_mask+0xc0/0xc0 [ 454.919865][ T1168] ? __kthread_bind_mask+0xc0/0xc0 [ 454.925031][ T1168] ret_from_fork+0x1f/0x30 [ 454.929584][ T1168] Sending NMI from CPU 1 to CPUs 0: [ 454.935345][ C0] NMI backtrace for cpu 0 [ 454.935351][ C0] CPU: 0 PID: 7 Comm: kworker/u4:0 Not tainted 5.9.0-rc2-syzkaller #0 [ 454.935358][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 454.935363][ C0] Workqueue: bat_events batadv_nc_worker [ 454.935370][ C0] RIP: 0010:check_memory_region+0x44/0x180 [ 454.935382][ C0] Code: 01 00 00 48 b8 ff ff ff ff ff 7f ff ff 48 39 c7 0f 86 05 01 00 00 49 83 e9 01 48 89 fd 48 b8 00 00 00 00 00 fc ff df 4d 89 ca <48> c1 ed 03 49 c1 ea 03 48 01 c5 49 01 c2 48 89 e8 49 8d 5a 01 48 [ 454.935386][ C0] RSP: 0018:ffffc90000cdfb98 EFLAGS: 00000092 [ 454.935394][ C0] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff815a635e [ 454.935400][ C0] RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8ab23488 [ 454.935405][ C0] RBP: ffffffff8ab23488 R08: 0000000000000000 R09: ffffffff8ab2348f [ 454.935410][ C0] R10: ffffffff8ab2348f R11: 0000000000000000 R12: ffffffff89bd6900 [ 454.935416][ C0] R13: ffffffff87d7d261 R14: dffffc0000000000 R15: 0000000000000317 [ 454.935422][ C0] FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 454.935426][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 454.935432][ C0] CR2: 00007f83e7200000 CR3: 00000000a91d9000 CR4: 00000000001506f0 [ 454.935437][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 454.935442][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 454.935445][ C0] Call Trace: [ 454.935449][ C0] lock_release+0x18e/0x8e0 [ 454.935453][ C0] ? lock_downgrade+0x830/0x830 [ 454.935457][ C0] ? lock_acquire+0x1f1/0xad0 [ 454.935460][ C0] batadv_nc_worker+0x7a3/0xe50 [ 454.935465][ C0] ? _raw_spin_unlock_irq+0x1f/0x80 [ 454.935469][ C0] process_one_work+0x94c/0x1670 [ 454.935472][ C0] ? lock_release+0x8e0/0x8e0 [ 454.935476][ C0] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 454.935480][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 454.935484][ C0] worker_thread+0x64c/0x1120 [ 454.935488][ C0] ? process_one_work+0x1670/0x1670 [ 454.935491][ C0] kthread+0x3b5/0x4a0 [ 454.935495][ C0] ? __kthread_bind_mask+0xc0/0xc0 [ 454.935499][ C0] ? __kthread_bind_mask+0xc0/0xc0 [ 454.935503][ C0] ret_from_fork+0x1f/0x30 [ 454.936644][ T1168] Kernel panic - not syncing: hung_task: blocked tasks [ 455.156529][ T1168] CPU: 1 PID: 1168 Comm: khungtaskd Not tainted 5.9.0-rc2-syzkaller #0 [ 455.164756][ T1168] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 455.174793][ T1168] Call Trace: [ 455.178083][ T1168] dump_stack+0x18f/0x20d [ 455.182452][ T1168] panic+0x2e3/0x75c [ 455.186349][ T1168] ? __warn_printk+0xf3/0xf3 [ 455.190921][ T1168] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 455.196617][ T1168] ? preempt_schedule_thunk+0x16/0x18 [ 455.202018][ T1168] ? watchdog.cold+0x5/0x16b [ 455.206623][ T1168] ? watchdog+0xa82/0x1000 [ 455.211037][ T1168] watchdog.cold+0x16/0x16b [ 455.215522][ T1168] ? reset_hung_task_detector+0x30/0x30 [ 455.221072][ T1168] kthread+0x3b5/0x4a0 [ 455.225726][ T1168] ? __kthread_bind_mask+0xc0/0xc0 [ 455.230814][ T1168] ? __kthread_bind_mask+0xc0/0xc0 [ 455.235905][ T1168] ret_from_fork+0x1f/0x30 [ 455.241817][ T1168] Kernel Offset: disabled [ 455.246153][ T1168] Rebooting in 86400 seconds..