[ 39.722484][ T26] audit: type=1800 audit(1570780581.421:27): pid=7636 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 39.742165][ T26] audit: type=1800 audit(1570780581.431:28): pid=7636 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 40.619023][ T26] audit: type=1800 audit(1570780582.381:29): pid=7636 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 40.649389][ T26] audit: type=1800 audit(1570780582.381:30): pid=7636 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.55' (ECDSA) to the list of known hosts. 2019/10/11 08:12:23 parsed 1 programs 2019/10/11 08:12:24 executed programs: 0 syzkaller login: [ 1003.253213][ T7801] IPVS: ftp: loaded support on port[0] = 21 [ 1003.301472][ T7801] chnl_net:caif_netlink_parms(): no params data found [ 1003.325875][ T7801] bridge0: port 1(bridge_slave_0) entered blocking state [ 1003.333740][ T7801] bridge0: port 1(bridge_slave_0) entered disabled state [ 1003.341606][ T7801] device bridge_slave_0 entered promiscuous mode [ 1003.349493][ T7801] bridge0: port 2(bridge_slave_1) entered blocking state [ 1003.356874][ T7801] bridge0: port 2(bridge_slave_1) entered disabled state [ 1003.365166][ T7801] device bridge_slave_1 entered promiscuous mode [ 1003.379106][ T7801] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 1003.390367][ T7801] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 1003.406616][ T7801] team0: Port device team_slave_0 added [ 1003.413943][ T7801] team0: Port device team_slave_1 added [ 1003.474298][ T7801] device hsr_slave_0 entered promiscuous mode [ 1003.532408][ T7801] device hsr_slave_1 entered promiscuous mode [ 1003.578632][ T7801] bridge0: port 2(bridge_slave_1) entered blocking state [ 1003.585783][ T7801] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1003.593519][ T7801] bridge0: port 1(bridge_slave_0) entered blocking state [ 1003.600549][ T7801] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1003.627794][ T7801] 8021q: adding VLAN 0 to HW filter on device bond0 [ 1003.639980][ T7803] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 1003.659786][ T7803] bridge0: port 1(bridge_slave_0) entered disabled state [ 1003.668059][ T7803] bridge0: port 2(bridge_slave_1) entered disabled state [ 1003.676178][ T7803] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 1003.687079][ T7801] 8021q: adding VLAN 0 to HW filter on device team0 [ 1003.697013][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 1003.705397][ T22] bridge0: port 1(bridge_slave_0) entered blocking state [ 1003.712466][ T22] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1003.731431][ T7801] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 1003.743508][ T7801] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 1003.756208][ T7807] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 1003.764795][ T7807] bridge0: port 2(bridge_slave_1) entered blocking state [ 1003.771839][ T7807] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1003.779766][ T7807] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 1003.790540][ T7807] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 1003.798825][ T7807] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 1003.807358][ T7807] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 1003.816112][ T3010] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 1003.823640][ T3010] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 1003.839751][ T7801] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 1004.282974][ T7804] Bluetooth: Error in BCSP hdr checksum [ 1004.542720][ T7804] Bluetooth: Error in BCSP hdr checksum [ 1006.102562][ T3010] Bluetooth: hci0: command 0x1003 tx timeout [ 1006.108928][ T7818] Bluetooth: hci0: sending frame failed (-49) [ 1008.182161][ T7803] Bluetooth: hci0: command 0x1001 tx timeout [ 1008.188252][ T7818] Bluetooth: hci0: sending frame failed (-49) [ 1010.262110][ T3010] Bluetooth: hci0: command 0x1009 tx timeout [ 1014.425625][ T7814] ================================================================== [ 1014.433957][ T7814] BUG: KASAN: use-after-free in kfree_skb+0x2a/0xb0 [ 1014.440521][ T7814] Read of size 4 at addr ffff88809da445d4 by task syz-executor.0/7814 [ 1014.448679][ T7814] [ 1014.450987][ T7814] CPU: 1 PID: 7814 Comm: syz-executor.0 Not tainted 5.4.0-rc2+ #0 [ 1014.458759][ T7814] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1014.468794][ T7814] Call Trace: [ 1014.472126][ T7814] dump_stack+0x1d8/0x2f8 [ 1014.476466][ T7814] print_address_description+0x75/0x5c0 [ 1014.484186][ T7814] ? vprintk_func+0x158/0x170 [ 1014.488837][ T7814] ? printk+0x62/0x8d [ 1014.492797][ T7814] ? vprintk_emit+0x2d4/0x3a0 [ 1014.497455][ T7814] __kasan_report+0x14b/0x1c0 [ 1014.502116][ T7814] ? kfree_skb+0x2a/0xb0 [ 1014.506331][ T7814] kasan_report+0x26/0x50 [ 1014.511265][ T7814] check_memory_region+0x2cf/0x2e0 [ 1014.516362][ T7814] __kasan_check_read+0x11/0x20 [ 1014.521204][ T7814] kfree_skb+0x2a/0xb0 [ 1014.525354][ T7814] bcsp_close+0xb1/0xf0 [ 1014.529505][ T7814] hci_uart_tty_close+0x201/0x240 [ 1014.534509][ T7814] ? hci_uart_tty_open+0x340/0x340 [ 1014.539655][ T7814] tty_ldisc_close+0x126/0x180 [ 1014.544400][ T7814] tty_ldisc_release+0x248/0x5a0 [ 1014.549360][ T7814] tty_release_struct+0x2a/0xe0 [ 1014.554189][ T7814] tty_release+0xce9/0xfa0 [ 1014.558582][ T7814] ? tty_release_struct+0xe0/0xe0 [ 1014.563606][ T7814] __fput+0x2e4/0x740 [ 1014.567569][ T7814] ____fput+0x15/0x20 [ 1014.571566][ T7814] task_work_run+0x17e/0x1b0 [ 1014.576177][ T7814] prepare_exit_to_usermode+0x459/0x580 [ 1014.581737][ T7814] syscall_return_slowpath+0x113/0x4a0 [ 1014.587185][ T7814] do_syscall_64+0x11f/0x1c0 [ 1014.591821][ T7814] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1014.597731][ T7814] RIP: 0033:0x413741 [ 1014.601601][ T7814] Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 [ 1014.621179][ T7814] RSP: 002b:00007fff584e3390 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 1014.629563][ T7814] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000413741 [ 1014.637510][ T7814] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 [ 1014.645457][ T7814] RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff [ 1014.653400][ T7814] R10: 00007fff584e3470 R11: 0000000000000293 R12: 000000000075c9a0 [ 1014.661345][ T7814] R13: 000000000075c9a0 R14: 00000000007603c0 R15: 000000000075bfd4 [ 1014.669300][ T7814] [ 1014.671608][ T7814] Allocated by task 7804: [ 1014.675914][ T7814] __kasan_kmalloc+0x11c/0x1b0 [ 1014.680655][ T7814] kasan_slab_alloc+0xf/0x20 [ 1014.685281][ T7814] kmem_cache_alloc_node+0x235/0x280 [ 1014.690554][ T7814] __alloc_skb+0x9f/0x500 [ 1014.694858][ T7814] bcsp_recv+0x12e7/0x1720 [ 1014.699333][ T7814] hci_uart_tty_receive+0x16b/0x470 [ 1014.704514][ T7814] tty_ldisc_receive_buf+0x12e/0x170 [ 1014.709769][ T7814] tty_port_default_receive_buf+0x82/0xb0 [ 1014.715456][ T7814] flush_to_ldisc+0x328/0x550 [ 1014.720102][ T7814] process_one_work+0x7ef/0x10e0 [ 1014.725008][ T7814] worker_thread+0xc01/0x1630 [ 1014.729665][ T7814] kthread+0x332/0x350 [ 1014.733718][ T7814] ret_from_fork+0x24/0x30 [ 1014.738102][ T7814] [ 1014.740405][ T7814] Freed by task 7804: [ 1014.744357][ T7814] __kasan_slab_free+0x12a/0x1e0 [ 1014.749264][ T7814] kasan_slab_free+0xe/0x10 [ 1014.753765][ T7814] kmem_cache_free+0x81/0xf0 [ 1014.758326][ T7814] __kfree_skb+0x118/0x170 [ 1014.762711][ T7814] kfree_skb+0x6f/0xb0 [ 1014.766753][ T7814] bcsp_recv+0x99c/0x1720 [ 1014.771049][ T7814] hci_uart_tty_receive+0x16b/0x470 [ 1014.776219][ T7814] tty_ldisc_receive_buf+0x12e/0x170 [ 1014.781493][ T7814] tty_port_default_receive_buf+0x82/0xb0 [ 1014.787181][ T7814] flush_to_ldisc+0x328/0x550 [ 1014.791833][ T7814] process_one_work+0x7ef/0x10e0 [ 1014.796739][ T7814] worker_thread+0xc01/0x1630 [ 1014.801386][ T7814] kthread+0x332/0x350 [ 1014.805430][ T7814] ret_from_fork+0x24/0x30 [ 1014.810245][ T7814] [ 1014.812547][ T7814] The buggy address belongs to the object at ffff88809da44500 [ 1014.812547][ T7814] which belongs to the cache skbuff_head_cache of size 224 [ 1014.827099][ T7814] The buggy address is located 212 bytes inside of [ 1014.827099][ T7814] 224-byte region [ffff88809da44500, ffff88809da445e0) [ 1014.840389][ T7814] The buggy address belongs to the page: [ 1014.846010][ T7814] page:ffffea0002769100 refcount:1 mapcount:0 mapping:ffff8880a99c1a80 index:0x0 [ 1014.855094][ T7814] flags: 0x1fffc0000000200(slab) [ 1014.860017][ T7814] raw: 01fffc0000000200 ffffea0002959b88 ffffea00024c35c8 ffff8880a99c1a80 [ 1014.868571][ T7814] raw: 0000000000000000 ffff88809da44000 000000010000000c 0000000000000000 [ 1014.877143][ T7814] page dumped because: kasan: bad access detected [ 1014.883523][ T7814] [ 1014.885820][ T7814] Memory state around the buggy address: [ 1014.891420][ T7814] ffff88809da44480: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 1014.899461][ T7814] ffff88809da44500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1014.907538][ T7814] >ffff88809da44580: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc [ 1014.915578][ T7814] ^ [ 1014.922310][ T7814] ffff88809da44600: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 1014.930343][ T7814] ffff88809da44680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1014.938377][ T7814] ================================================================== [ 1014.946417][ T7814] Disabling lock debugging due to kernel taint [ 1014.953826][ T7814] Kernel panic - not syncing: panic_on_warn set ... [ 1014.960419][ T7814] CPU: 0 PID: 7814 Comm: syz-executor.0 Tainted: G B 5.4.0-rc2+ #0 [ 1014.969622][ T7814] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1014.979648][ T7814] Call Trace: [ 1014.982914][ T7814] dump_stack+0x1d8/0x2f8 [ 1014.987261][ T7814] panic+0x264/0x7a9 [ 1014.991129][ T7814] ? __kasan_report+0x195/0x1c0 [ 1014.995989][ T7814] ? trace_hardirqs_on+0x34/0x80 [ 1015.000896][ T7814] ? __kasan_report+0x195/0x1c0 [ 1015.005728][ T7814] __kasan_report+0x1bb/0x1c0 [ 1015.010375][ T7814] ? kfree_skb+0x2a/0xb0 [ 1015.014609][ T7814] kasan_report+0x26/0x50 [ 1015.018919][ T7814] check_memory_region+0x2cf/0x2e0 [ 1015.024086][ T7814] __kasan_check_read+0x11/0x20 [ 1015.028906][ T7814] kfree_skb+0x2a/0xb0 [ 1015.032955][ T7814] bcsp_close+0xb1/0xf0 [ 1015.037081][ T7814] hci_uart_tty_close+0x201/0x240 [ 1015.042073][ T7814] ? hci_uart_tty_open+0x340/0x340 [ 1015.047184][ T7814] tty_ldisc_close+0x126/0x180 [ 1015.051915][ T7814] tty_ldisc_release+0x248/0x5a0 [ 1015.056823][ T7814] tty_release_struct+0x2a/0xe0 [ 1015.061645][ T7814] tty_release+0xce9/0xfa0 [ 1015.066034][ T7814] ? tty_release_struct+0xe0/0xe0 [ 1015.071035][ T7814] __fput+0x2e4/0x740 [ 1015.074988][ T7814] ____fput+0x15/0x20 [ 1015.078937][ T7814] task_work_run+0x17e/0x1b0 [ 1015.083501][ T7814] prepare_exit_to_usermode+0x459/0x580 [ 1015.089024][ T7814] syscall_return_slowpath+0x113/0x4a0 [ 1015.094627][ T7814] do_syscall_64+0x11f/0x1c0 [ 1015.099190][ T7814] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1015.105051][ T7814] RIP: 0033:0x413741 [ 1015.108915][ T7814] Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 [ 1015.128487][ T7814] RSP: 002b:00007fff584e3390 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 1015.136901][ T7814] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000413741 [ 1015.145622][ T7814] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 [ 1015.153576][ T7814] RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff [ 1015.161515][ T7814] R10: 00007fff584e3470 R11: 0000000000000293 R12: 000000000075c9a0 [ 1015.169463][ T7814] R13: 000000000075c9a0 R14: 00000000007603c0 R15: 000000000075bfd4 [ 1015.178806][ T7814] Kernel Offset: disabled [ 1015.183127][ T7814] Rebooting in 86400 seconds..