[ 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 '10.128.1.55' (ECDSA) to the list of known hosts. 2021/02/14 11:28:14 parsed 1 programs 2021/02/14 11:28:14 executed programs: 0 syzkaller login: [ 1579.796605] IPVS: ftp: loaded support on port[0] = 21 [ 1579.889759] chnl_net:caif_netlink_parms(): no params data found [ 1579.974569] bridge0: port 1(bridge_slave_0) entered blocking state [ 1579.982152] bridge0: port 1(bridge_slave_0) entered disabled state [ 1579.990406] device bridge_slave_0 entered promiscuous mode [ 1579.998399] bridge0: port 2(bridge_slave_1) entered blocking state [ 1580.005983] bridge0: port 2(bridge_slave_1) entered disabled state [ 1580.013434] device bridge_slave_1 entered promiscuous mode [ 1580.029640] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 1580.039388] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 1580.056974] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 1580.064481] team0: Port device team_slave_0 added [ 1580.071054] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 1580.078778] team0: Port device team_slave_1 added [ 1580.093510] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 1580.099935] 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. [ 1580.126320] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 1580.138227] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 1580.144541] 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. [ 1580.171970] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 1580.183120] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 1580.190450] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 1580.209162] device hsr_slave_0 entered promiscuous mode [ 1580.215033] device hsr_slave_1 entered promiscuous mode [ 1580.221502] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 1580.229165] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 1580.289259] bridge0: port 2(bridge_slave_1) entered blocking state [ 1580.296365] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1580.303413] bridge0: port 1(bridge_slave_0) entered blocking state [ 1580.310558] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1580.338888] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 1580.346109] 8021q: adding VLAN 0 to HW filter on device bond0 [ 1580.355845] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 1580.364894] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 1580.384555] bridge0: port 1(bridge_slave_0) entered disabled state [ 1580.392683] bridge0: port 2(bridge_slave_1) entered disabled state [ 1580.402072] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 1580.409526] 8021q: adding VLAN 0 to HW filter on device team0 [ 1580.418161] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 1580.426002] bridge0: port 1(bridge_slave_0) entered blocking state [ 1580.432770] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1580.442562] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 1580.450423] bridge0: port 2(bridge_slave_1) entered blocking state [ 1580.457711] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1580.473985] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 1580.483238] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 1580.494739] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 1580.502198] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 1580.514695] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 1580.524777] IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready [ 1580.531055] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 1580.543933] IPv6: ADDRCONF(NETDEV_UP): vxcan0: link is not ready [ 1580.551702] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 1580.559382] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 1580.571129] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 1580.621769] IPv6: ADDRCONF(NETDEV_UP): veth0_virt_wifi: link is not ready [ 1580.635154] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 1580.659789] IPv6: ADDRCONF(NETDEV_UP): veth0_vlan: link is not ready [ 1580.667407] IPv6: ADDRCONF(NETDEV_UP): vlan0: link is not ready [ 1580.675992] IPv6: ADDRCONF(NETDEV_UP): vlan1: link is not ready [ 1580.686277] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 1580.694053] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 1580.700886] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 1580.710052] device veth0_vlan entered promiscuous mode [ 1580.719642] device veth1_vlan entered promiscuous mode [ 1580.725970] IPv6: ADDRCONF(NETDEV_UP): macvlan0: link is not ready [ 1580.735932] IPv6: ADDRCONF(NETDEV_UP): macvlan1: link is not ready [ 1580.747294] IPv6: ADDRCONF(NETDEV_UP): veth0_macvtap: link is not ready [ 1580.757360] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 1580.764767] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 1580.772561] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 1580.782103] device veth0_macvtap entered promiscuous mode [ 1580.788953] IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready [ 1580.798388] device veth1_macvtap entered promiscuous mode [ 1580.807143] IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready [ 1580.816645] IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready [ 1580.826654] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 1580.833962] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 1580.842782] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 1580.852081] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 1580.859410] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 1580.868596] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 1581.833360] Bluetooth: hci0 command 0x0409 tx timeout [ 1583.622042] ================================================================== [ 1583.629500] BUG: KASAN: use-after-free in __lock_acquire+0x2c57/0x3f20 [ 1583.636440] Read of size 8 at addr ffff888095e946e0 by task syz-executor.0/7996 [ 1583.643959] [ 1583.645580] CPU: 0 PID: 7996 Comm: syz-executor.0 Not tainted 4.14.218-syzkaller #0 [ 1583.653871] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1583.663229] Call Trace: [ 1583.665840] dump_stack+0x1b2/0x281 [ 1583.669500] print_address_description.cold+0x54/0x1d3 [ 1583.674846] kasan_report_error.cold+0x8a/0x191 [ 1583.679509] ? __lock_acquire+0x2c57/0x3f20 [ 1583.683874] __asan_report_load8_noabort+0x68/0x70 [ 1583.688881] ? __lock_acquire+0x2c57/0x3f20 [ 1583.693180] __lock_acquire+0x2c57/0x3f20 [ 1583.697316] ? lock_acquire+0x170/0x3f0 [ 1583.701292] ? lock_downgrade+0x740/0x740 [ 1583.705661] ? trace_hardirqs_on+0x10/0x10 [ 1583.709921] ? debug_object_assert_init+0x22d/0x2d0 [ 1583.715047] ? hci_conn_hash_flush+0x19c/0x260 [ 1583.719712] ? debug_object_active_state+0x330/0x330 [ 1583.724891] ? lock_acquire+0x170/0x3f0 [ 1583.729227] ? l2cap_conn_del+0x363/0x690 [ 1583.733390] lock_acquire+0x170/0x3f0 [ 1583.737398] ? lock_sock_nested+0x39/0x100 [ 1583.741674] _raw_spin_lock_bh+0x2f/0x40 [ 1583.745721] ? lock_sock_nested+0x39/0x100 [ 1583.750068] lock_sock_nested+0x39/0x100 [ 1583.754204] l2cap_sock_teardown_cb+0x93/0x650 [ 1583.758911] ? trace_hardirqs_on_caller+0x3a8/0x580 [ 1583.763963] l2cap_chan_del+0xaf/0x950 [ 1583.767844] l2cap_conn_del+0x36e/0x690 [ 1583.771796] ? l2cap_conn_del+0x690/0x690 [ 1583.776016] l2cap_disconn_cfm+0x7c/0xb0 [ 1583.780065] hci_conn_hash_flush+0x127/0x260 [ 1583.784449] hci_dev_do_close+0x535/0xca0 [ 1583.789081] ? __fsnotify_inode_delete+0x20/0x20 [ 1583.794171] hci_unregister_dev+0x17f/0x8c0 [ 1583.798510] ? fcntl_setlk+0xdb0/0xdb0 [ 1583.802504] ? vhci_close_dev+0x50/0x50 [ 1583.806627] vhci_release+0x70/0xe0 [ 1583.810271] __fput+0x25f/0x7a0 [ 1583.813617] task_work_run+0x11f/0x190 [ 1583.817701] do_exit+0xa44/0x2850 [ 1583.821166] ? __do_page_fault+0x571/0xad0 [ 1583.825377] ? mm_update_next_owner+0x5b0/0x5b0 [ 1583.830042] ? lock_downgrade+0x740/0x740 [ 1583.834168] do_group_exit+0x100/0x2e0 [ 1583.838029] SyS_exit_group+0x19/0x20 [ 1583.841806] ? do_group_exit+0x2e0/0x2e0 [ 1583.845902] do_syscall_64+0x1d5/0x640 [ 1583.849790] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1583.854955] RIP: 0033:0x465d99 [ 1583.858122] RSP: 002b:00007ffe7376b508 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 1583.866015] RAX: ffffffffffffffda RBX: 0000000000000261 RCX: 0000000000465d99 [ 1583.873264] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000043 [ 1583.880524] RBP: 00000000004bcaed R08: 000000000000000b R09: 0000000000000004 [ 1583.887957] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 1583.895370] R13: 0000000000182a9e R14: 0000000000000004 R15: 00007ffe7376b6f0 [ 1583.902627] [ 1583.904252] Allocated by task 9081: [ 1583.907873] kasan_kmalloc+0xeb/0x160 [ 1583.911905] __kmalloc+0x15a/0x400 [ 1583.915434] sk_prot_alloc+0x1ba/0x290 [ 1583.919389] sk_alloc+0x36/0xcd0 [ 1583.923021] l2cap_sock_alloc.constprop.0+0x31/0x210 [ 1583.928283] l2cap_sock_create+0xf0/0x1a0 [ 1583.932579] bt_sock_create+0x13b/0x280 [ 1583.936528] __sock_create+0x303/0x620 [ 1583.940404] SyS_socket+0xd1/0x1b0 [ 1583.943919] do_syscall_64+0x1d5/0x640 [ 1583.948127] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1583.953465] [ 1583.955154] Freed by task 9080: [ 1583.958417] kasan_slab_free+0xc3/0x1a0 [ 1583.962401] kfree+0xc9/0x250 [ 1583.965592] __sk_destruct+0x5e3/0x760 [ 1583.969454] __sk_free+0xd9/0x2d0 [ 1583.972895] sk_free+0x2b/0x40 [ 1583.976062] l2cap_sock_kill.part.0+0x106/0x130 [ 1583.980701] l2cap_sock_release+0x1cd/0x280 [ 1583.985009] __sock_release+0xcd/0x2b0 [ 1583.988884] sock_close+0x15/0x20 [ 1583.992370] __fput+0x25f/0x7a0 [ 1583.995650] task_work_run+0x11f/0x190 [ 1583.999598] exit_to_usermode_loop+0x1ad/0x200 [ 1584.004255] do_syscall_64+0x4a3/0x640 [ 1584.008128] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1584.013308] [ 1584.014927] The buggy address belongs to the object at ffff888095e94640 [ 1584.014927] which belongs to the cache kmalloc-2048 of size 2048 [ 1584.027822] The buggy address is located 160 bytes inside of [ 1584.027822] 2048-byte region [ffff888095e94640, ffff888095e94e40) [ 1584.039848] The buggy address belongs to the page: [ 1584.044840] page:ffffea000257a500 count:1 mapcount:0 mapping:ffff888095e94640 index:0x0 compound_mapcount: 0 [ 1584.054787] flags: 0xfff00000008100(slab|head) [ 1584.059358] raw: 00fff00000008100 ffff888095e94640 0000000000000000 0000000100000003 [ 1584.067348] raw: ffffea0002c17ca0 ffffea000254c0a0 ffff88813fe80c40 0000000000000000 [ 1584.075200] page dumped because: kasan: bad access detected [ 1584.080880] [ 1584.082481] Memory state around the buggy address: [ 1584.087400] ffff888095e94580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 1584.094746] ffff888095e94600: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 1584.102389] >ffff888095e94680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1584.109825] ^ [ 1584.116300] ffff888095e94700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1584.123849] ffff888095e94780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1584.131213] ================================================================== [ 1584.138560] Disabling lock debugging due to kernel taint [ 1584.143991] Kernel panic - not syncing: panic_on_warn set ... [ 1584.143991] [ 1584.151497] CPU: 0 PID: 7996 Comm: syz-executor.0 Tainted: G B 4.14.218-syzkaller #0 [ 1584.160848] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1584.170323] Call Trace: [ 1584.172896] dump_stack+0x1b2/0x281 [ 1584.176557] panic+0x1f9/0x42d [ 1584.179737] ? add_taint.cold+0x16/0x16 [ 1584.183847] ? lock_downgrade+0x740/0x740 [ 1584.187973] kasan_end_report+0x43/0x49 [ 1584.192106] kasan_report_error.cold+0xa7/0x191 [ 1584.197003] ? __lock_acquire+0x2c57/0x3f20 [ 1584.201654] __asan_report_load8_noabort+0x68/0x70 [ 1584.206576] ? __lock_acquire+0x2c57/0x3f20 [ 1584.210890] __lock_acquire+0x2c57/0x3f20 [ 1584.215148] ? lock_acquire+0x170/0x3f0 [ 1584.219155] ? lock_downgrade+0x740/0x740 [ 1584.223338] ? trace_hardirqs_on+0x10/0x10 [ 1584.227549] ? debug_object_assert_init+0x22d/0x2d0 [ 1584.232549] ? hci_conn_hash_flush+0x19c/0x260 [ 1584.237107] ? debug_object_active_state+0x330/0x330 [ 1584.242184] ? lock_acquire+0x170/0x3f0 [ 1584.246147] ? l2cap_conn_del+0x363/0x690 [ 1584.250269] lock_acquire+0x170/0x3f0 [ 1584.254047] ? lock_sock_nested+0x39/0x100 [ 1584.258377] _raw_spin_lock_bh+0x2f/0x40 [ 1584.262513] ? lock_sock_nested+0x39/0x100 [ 1584.266723] lock_sock_nested+0x39/0x100 [ 1584.270760] l2cap_sock_teardown_cb+0x93/0x650 [ 1584.275319] ? trace_hardirqs_on_caller+0x3a8/0x580 [ 1584.280311] l2cap_chan_del+0xaf/0x950 [ 1584.284187] l2cap_conn_del+0x36e/0x690 [ 1584.288324] ? l2cap_conn_del+0x690/0x690 [ 1584.292444] l2cap_disconn_cfm+0x7c/0xb0 [ 1584.296479] hci_conn_hash_flush+0x127/0x260 [ 1584.300865] hci_dev_do_close+0x535/0xca0 [ 1584.305000] ? __fsnotify_inode_delete+0x20/0x20 [ 1584.309740] hci_unregister_dev+0x17f/0x8c0 [ 1584.314040] ? fcntl_setlk+0xdb0/0xdb0 [ 1584.317903] ? vhci_close_dev+0x50/0x50 [ 1584.321849] vhci_release+0x70/0xe0 [ 1584.325467] __fput+0x25f/0x7a0 [ 1584.328721] task_work_run+0x11f/0x190 [ 1584.332846] do_exit+0xa44/0x2850 [ 1584.336308] ? __do_page_fault+0x571/0xad0 [ 1584.340624] ? mm_update_next_owner+0x5b0/0x5b0 [ 1584.345358] ? lock_downgrade+0x740/0x740 [ 1584.349485] do_group_exit+0x100/0x2e0 [ 1584.353492] SyS_exit_group+0x19/0x20 [ 1584.357520] ? do_group_exit+0x2e0/0x2e0 [ 1584.361866] do_syscall_64+0x1d5/0x640 [ 1584.365968] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1584.371426] RIP: 0033:0x465d99 [ 1584.374684] RSP: 002b:00007ffe7376b508 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 1584.382383] RAX: ffffffffffffffda RBX: 0000000000000261 RCX: 0000000000465d99 [ 1584.389819] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000043 [ 1584.397072] RBP: 00000000004bcaed R08: 000000000000000b R09: 0000000000000004 [ 1584.404587] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 1584.412200] R13: 0000000000182a9e R14: 0000000000000004 R15: 00007ffe7376b6f0 [ 1584.421112] Kernel Offset: disabled [ 1584.424888] Rebooting in 86400 seconds..