[ OK ] Started Getty on tty1. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ 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. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.15.215' (ECDSA) to the list of known hosts. 2021/02/18 17:04:40 parsed 1 programs 2021/02/18 17:04:40 executed programs: 0 syzkaller login: [ 39.952311] IPVS: ftp: loaded support on port[0] = 21 [ 40.079681] chnl_net:caif_netlink_parms(): no params data found [ 40.147528] bridge0: port 1(bridge_slave_0) entered blocking state [ 40.154885] bridge0: port 1(bridge_slave_0) entered disabled state [ 40.163393] device bridge_slave_0 entered promiscuous mode [ 40.171831] bridge0: port 2(bridge_slave_1) entered blocking state [ 40.178339] bridge0: port 2(bridge_slave_1) entered disabled state [ 40.186528] device bridge_slave_1 entered promiscuous mode [ 40.205469] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 40.214869] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 40.235022] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 40.243081] team0: Port device team_slave_0 added [ 40.248784] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 40.257876] team0: Port device team_slave_1 added [ 40.275330] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 40.282080] 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. [ 40.308584] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 40.321026] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 40.327276] 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. [ 40.355119] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 40.366487] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 40.376474] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 40.398563] device hsr_slave_0 entered promiscuous mode [ 40.404935] device hsr_slave_1 entered promiscuous mode [ 40.412543] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 40.419747] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 40.491713] bridge0: port 2(bridge_slave_1) entered blocking state [ 40.498179] bridge0: port 2(bridge_slave_1) entered forwarding state [ 40.505362] bridge0: port 1(bridge_slave_0) entered blocking state [ 40.511820] bridge0: port 1(bridge_slave_0) entered forwarding state [ 40.545881] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 40.553265] 8021q: adding VLAN 0 to HW filter on device bond0 [ 40.563960] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 40.573888] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 40.582799] bridge0: port 1(bridge_slave_0) entered disabled state [ 40.589949] bridge0: port 2(bridge_slave_1) entered disabled state [ 40.597781] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 40.609837] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 40.616464] 8021q: adding VLAN 0 to HW filter on device team0 [ 40.626241] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 40.636163] bridge0: port 1(bridge_slave_0) entered blocking state [ 40.642999] bridge0: port 1(bridge_slave_0) entered forwarding state [ 40.653918] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 40.662046] bridge0: port 2(bridge_slave_1) entered blocking state [ 40.668423] bridge0: port 2(bridge_slave_1) entered forwarding state [ 40.692520] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 40.701475] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 40.709396] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 40.718146] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 40.726818] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 40.736035] IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready [ 40.742953] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 40.757582] IPv6: ADDRCONF(NETDEV_UP): vxcan0: link is not ready [ 40.765195] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 40.773501] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 40.786134] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 40.801709] IPv6: ADDRCONF(NETDEV_UP): veth0_virt_wifi: link is not ready [ 40.813146] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 40.851872] IPv6: ADDRCONF(NETDEV_UP): veth0_vlan: link is not ready [ 40.859844] IPv6: ADDRCONF(NETDEV_UP): vlan0: link is not ready [ 40.867975] IPv6: ADDRCONF(NETDEV_UP): vlan1: link is not ready [ 40.878305] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 40.886885] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 40.894518] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 40.904068] device veth0_vlan entered promiscuous mode [ 40.915455] device veth1_vlan entered promiscuous mode [ 40.921574] IPv6: ADDRCONF(NETDEV_UP): macvlan0: link is not ready [ 40.931586] IPv6: ADDRCONF(NETDEV_UP): macvlan1: link is not ready [ 40.945472] IPv6: ADDRCONF(NETDEV_UP): veth0_macvtap: link is not ready [ 40.955344] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 40.964004] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 40.972171] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 40.983021] device veth0_macvtap entered promiscuous mode [ 40.989287] IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready [ 40.998685] device veth1_macvtap entered promiscuous mode [ 41.008946] IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready [ 41.018919] IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready [ 41.030954] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 41.038170] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 41.048432] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 41.059421] IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready [ 41.067095] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 41.073860] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 41.081936] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 41.206455] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready [ 41.214112] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 41.227745] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 41.237455] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 41.252086] IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready [ 41.258799] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 41.268496] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 41.277077] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready [ 41.340626] ================================================================== [ 41.348042] BUG: KASAN: use-after-free in __lock_acquire+0x2cb4/0x3ff0 [ 41.354721] Read of size 8 at addr ffff888093ec2620 by task syz-executor.0/8117 [ 41.362291] [ 41.363906] CPU: 1 PID: 8117 Comm: syz-executor.0 Not tainted 4.19.172-syzkaller #0 [ 41.371707] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.381066] Call Trace: [ 41.383655] dump_stack+0x1fc/0x2ef [ 41.387282] print_address_description.cold+0x54/0x219 [ 41.392562] kasan_report_error.cold+0x8a/0x1b9 [ 41.397245] ? __lock_acquire+0x2cb4/0x3ff0 [ 41.401584] __asan_report_load8_noabort+0x88/0x90 [ 41.406551] ? __lock_acquire+0x2cb4/0x3ff0 [ 41.410889] __lock_acquire+0x2cb4/0x3ff0 [ 41.415042] ? trace_hardirqs_off+0x64/0x200 [ 41.419454] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 41.424576] ? debug_object_assert_init+0x242/0x2e0 [ 41.429599] ? mark_held_locks+0xf0/0xf0 [ 41.433684] ? debug_object_free+0x380/0x380 [ 41.438082] ? kfree+0xcc/0x210 [ 41.441348] ? kfree_const+0x51/0x60 [ 41.445077] ? kobject_put+0x2b5/0x5d0 [ 41.449048] ? put_device+0x1c/0x30 [ 41.452681] ? lock_acquire+0x170/0x3c0 [ 41.456643] ? l2cap_conn_del+0x39b/0x6e0 [ 41.460780] ? del_timer+0xc3/0x100 [ 41.464395] lock_acquire+0x170/0x3c0 [ 41.468208] ? lock_sock_nested+0x3b/0x110 [ 41.472453] _raw_spin_lock_bh+0x2f/0x40 [ 41.476517] ? lock_sock_nested+0x3b/0x110 [ 41.480743] lock_sock_nested+0x3b/0x110 [ 41.484804] l2cap_sock_teardown_cb+0xa0/0x6d0 [ 41.489383] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 41.493974] l2cap_chan_del+0xbc/0xa50 [ 41.497845] l2cap_conn_del+0x3a6/0x6e0 [ 41.501809] ? l2cap_conn_del+0x6e0/0x6e0 [ 41.505973] l2cap_disconn_cfm+0x98/0xd0 [ 41.510038] hci_conn_hash_flush+0x127/0x260 [ 41.514446] hci_dev_do_close+0x659/0xf10 [ 41.518593] ? hci_dev_open+0x250/0x250 [ 41.522562] ? hci_unregister_dev+0x71/0x910 [ 41.526970] hci_unregister_dev+0x18b/0x910 [ 41.531284] ? vhci_close_dev+0x50/0x50 [ 41.535259] vhci_release+0x70/0xe0 [ 41.538876] __fput+0x2ce/0x890 [ 41.542159] task_work_run+0x148/0x1c0 [ 41.546035] do_exit+0xbf3/0x2be0 [ 41.549484] ? lock_downgrade+0x720/0x720 [ 41.553642] ? mm_update_next_owner+0x650/0x650 [ 41.558314] ? up_read+0x17/0x110 [ 41.561769] ? __do_page_fault+0x180/0xd60 [ 41.566015] do_group_exit+0x125/0x310 [ 41.569936] __x64_sys_exit_group+0x3a/0x50 [ 41.574269] do_syscall_64+0xf9/0x620 [ 41.578114] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 41.583321] RIP: 0033:0x465d99 [ 41.586531] Code: Bad RIP value. [ 41.589914] RSP: 002b:00007fff2d0a0918 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 41.597634] RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000465d99 [ 41.604921] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000043 [ 41.612487] RBP: 00000000004bcaed R08: 000000000000000b R09: 0000000000000012 [ 41.619784] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 41.627210] R13: 000000000000a19e R14: 0000000000000012 R15: 00007fff2d0a0b00 [ 41.635205] [ 41.637129] Allocated by task 8378: [ 41.640772] __kmalloc+0x15a/0x3c0 [ 41.644313] sk_prot_alloc+0x1e2/0x2d0 [ 41.649176] sk_alloc+0x36/0xec0 [ 41.653579] l2cap_sock_alloc.constprop.0+0x31/0x210 [ 41.658873] l2cap_sock_create+0x123/0x1f0 [ 41.663110] bt_sock_create+0x154/0x2a0 [ 41.667172] __sock_create+0x3d8/0x740 [ 41.671077] __sys_socket+0xef/0x200 [ 41.674803] __x64_sys_socket+0x6f/0xb0 [ 41.678972] do_syscall_64+0xf9/0x620 [ 41.683044] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 41.688405] [ 41.690032] Freed by task 8376: [ 41.693341] kfree+0xcc/0x210 [ 41.696440] __sk_destruct+0x684/0x8a0 [ 41.700585] __sk_free+0x165/0x3b0 [ 41.704114] sk_free+0x3b/0x50 [ 41.707737] l2cap_sock_kill.part.0+0x124/0x150 [ 41.712408] l2cap_sock_release+0x1e6/0x290 [ 41.716739] __sock_release+0xcd/0x2a0 [ 41.720633] sock_close+0x15/0x20 [ 41.724084] __fput+0x2ce/0x890 [ 41.727967] task_work_run+0x148/0x1c0 [ 41.731844] exit_to_usermode_loop+0x251/0x2a0 [ 41.736423] do_syscall_64+0x538/0x620 [ 41.740325] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 41.745521] [ 41.747166] The buggy address belongs to the object at ffff888093ec2580 [ 41.747166] which belongs to the cache kmalloc-2048 of size 2048 [ 41.760102] The buggy address is located 160 bytes inside of [ 41.760102] 2048-byte region [ffff888093ec2580, ffff888093ec2d80) [ 41.772059] The buggy address belongs to the page: [ 41.777015] page:ffffea00024fb080 count:1 mapcount:0 mapping:ffff88813bff0c40 index:0x0 compound_mapcount: 0 [ 41.787008] flags: 0xfff00000008100(slab|head) [ 41.791603] raw: 00fff00000008100 ffffea00024fb288 ffffea0002ad7a88 ffff88813bff0c40 [ 41.799482] raw: 0000000000000000 ffff888093ec2580 0000000100000003 0000000000000000 [ 41.807543] page dumped because: kasan: bad access detected [ 41.813280] [ 41.814914] Memory state around the buggy address: [ 41.819843] ffff888093ec2500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 41.827410] ffff888093ec2580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 41.834833] >ffff888093ec2600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 41.842222] ^ [ 41.846648] ffff888093ec2680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 41.854018] ffff888093ec2700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 41.861383] ================================================================== [ 41.868729] Disabling lock debugging due to kernel taint [ 41.874178] Kernel panic - not syncing: panic_on_warn set ... [ 41.874178] [ 41.881548] CPU: 1 PID: 8117 Comm: syz-executor.0 Tainted: G B 4.19.172-syzkaller #0 [ 41.890762] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.900126] Call Trace: [ 41.902715] dump_stack+0x1fc/0x2ef [ 41.906359] panic+0x26a/0x50e [ 41.909563] ? __warn_printk+0xf3/0xf3 [ 41.913470] ? lock_downgrade+0x720/0x720 [ 41.917622] ? print_shadow_for_address+0xb8/0x114 [ 41.922557] ? trace_hardirqs_off+0x64/0x200 [ 41.927013] kasan_end_report+0x43/0x49 [ 41.931012] kasan_report_error.cold+0xa7/0x1b9 [ 41.935701] ? __lock_acquire+0x2cb4/0x3ff0 [ 41.940205] __asan_report_load8_noabort+0x88/0x90 [ 41.945144] ? __lock_acquire+0x2cb4/0x3ff0 [ 41.950447] __lock_acquire+0x2cb4/0x3ff0 [ 41.954732] ? trace_hardirqs_off+0x64/0x200 [ 41.959162] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 41.967605] ? debug_object_assert_init+0x242/0x2e0 [ 41.973567] ? mark_held_locks+0xf0/0xf0 [ 41.977693] ? debug_object_free+0x380/0x380 [ 41.982126] ? kfree+0xcc/0x210 [ 41.985421] ? kfree_const+0x51/0x60 [ 41.989170] ? kobject_put+0x2b5/0x5d0 [ 41.989594] Bluetooth: hci0: command 0x0409 tx timeout [ 41.993102] ? put_device+0x1c/0x30 [ 42.002492] ? lock_acquire+0x170/0x3c0 [ 42.006667] ? l2cap_conn_del+0x39b/0x6e0 [ 42.010848] ? del_timer+0xc3/0x100 [ 42.014496] lock_acquire+0x170/0x3c0 [ 42.018323] ? lock_sock_nested+0x3b/0x110 [ 42.022580] _raw_spin_lock_bh+0x2f/0x40 [ 42.026689] ? lock_sock_nested+0x3b/0x110 [ 42.030960] lock_sock_nested+0x3b/0x110 [ 42.035132] l2cap_sock_teardown_cb+0xa0/0x6d0 [ 42.039745] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 42.044347] l2cap_chan_del+0xbc/0xa50 [ 42.048275] l2cap_conn_del+0x3a6/0x6e0 [ 42.052300] ? l2cap_conn_del+0x6e0/0x6e0 [ 42.057068] l2cap_disconn_cfm+0x98/0xd0 [ 42.061266] hci_conn_hash_flush+0x127/0x260 [ 42.065698] hci_dev_do_close+0x659/0xf10 [ 42.069893] ? hci_dev_open+0x250/0x250 [ 42.073873] ? hci_unregister_dev+0x71/0x910 [ 42.078298] hci_unregister_dev+0x18b/0x910 [ 42.082726] ? vhci_close_dev+0x50/0x50 [ 42.086717] vhci_release+0x70/0xe0 [ 42.091260] __fput+0x2ce/0x890 [ 42.094541] task_work_run+0x148/0x1c0 [ 42.098423] do_exit+0xbf3/0x2be0 [ 42.101897] ? lock_downgrade+0x720/0x720 [ 42.106045] ? mm_update_next_owner+0x650/0x650 [ 42.110955] ? up_read+0x17/0x110 [ 42.114483] ? __do_page_fault+0x180/0xd60 [ 42.118998] do_group_exit+0x125/0x310 [ 42.123315] __x64_sys_exit_group+0x3a/0x50 [ 42.127627] do_syscall_64+0xf9/0x620 [ 42.131442] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 42.136715] RIP: 0033:0x465d99 [ 42.139921] Code: Bad RIP value. [ 42.143367] RSP: 002b:00007fff2d0a0918 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 42.152042] RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000465d99 [ 42.159327] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000043 [ 42.166677] RBP: 00000000004bcaed R08: 000000000000000b R09: 0000000000000012 [ 42.174549] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 42.182125] R13: 000000000000a19e R14: 0000000000000012 R15: 00007fff2d0a0b00 [ 42.190361] Kernel Offset: disabled [ 42.194022] Rebooting in 86400 seconds..