[ 43.652988][ T26] audit: type=1800 audit(1572529069.992:25): pid=7793 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 43.695075][ T26] audit: type=1800 audit(1572529069.992:26): pid=7793 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 43.724679][ T26] audit: type=1800 audit(1572529070.002:27): pid=7793 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 43.744977][ T26] audit: type=1800 audit(1572529070.002:28): pid=7793 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[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.119' (ECDSA) to the list of known hosts. 2019/10/31 13:53:32 parsed 1 programs 2019/10/31 13:53:34 executed programs: 0 syzkaller login: [ 988.428315][ T7959] IPVS: ftp: loaded support on port[0] = 21 [ 988.478045][ T7959] chnl_net:caif_netlink_parms(): no params data found [ 988.502536][ T7959] bridge0: port 1(bridge_slave_0) entered blocking state [ 988.510229][ T7959] bridge0: port 1(bridge_slave_0) entered disabled state [ 988.518400][ T7959] device bridge_slave_0 entered promiscuous mode [ 988.526188][ T7959] bridge0: port 2(bridge_slave_1) entered blocking state [ 988.533354][ T7959] bridge0: port 2(bridge_slave_1) entered disabled state [ 988.540923][ T7959] device bridge_slave_1 entered promiscuous mode [ 988.555419][ T7959] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 988.566517][ T7959] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 988.583864][ T7959] team0: Port device team_slave_0 added [ 988.590890][ T7959] team0: Port device team_slave_1 added [ 988.669529][ T7959] device hsr_slave_0 entered promiscuous mode [ 988.718258][ T7959] device hsr_slave_1 entered promiscuous mode [ 988.839011][ T7959] bridge0: port 2(bridge_slave_1) entered blocking state [ 988.846233][ T7959] bridge0: port 2(bridge_slave_1) entered forwarding state [ 988.854137][ T7959] bridge0: port 1(bridge_slave_0) entered blocking state [ 988.861308][ T7959] bridge0: port 1(bridge_slave_0) entered forwarding state [ 988.957186][ T7959] 8021q: adding VLAN 0 to HW filter on device bond0 [ 988.972225][ T7961] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 988.999805][ T7961] bridge0: port 1(bridge_slave_0) entered disabled state [ 989.039450][ T7961] bridge0: port 2(bridge_slave_1) entered disabled state [ 989.059911][ T7961] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 989.093616][ T7959] 8021q: adding VLAN 0 to HW filter on device team0 [ 989.124273][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 989.139038][ T12] bridge0: port 1(bridge_slave_0) entered blocking state [ 989.146124][ T12] bridge0: port 1(bridge_slave_0) entered forwarding state [ 989.209818][ T7961] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 989.228448][ T7961] bridge0: port 2(bridge_slave_1) entered blocking state [ 989.235530][ T7961] bridge0: port 2(bridge_slave_1) entered forwarding state [ 989.279939][ T7961] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 989.320921][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 989.329567][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 989.339327][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 989.348360][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 989.358275][ T7959] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 989.383135][ T7959] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 989.808502][ T388] Bluetooth: Error in BCSP hdr checksum [ 990.068042][ T388] Bluetooth: Error in BCSP hdr checksum [ 991.608413][ T22] Bluetooth: hci0: command 0x1003 tx timeout [ 991.614997][ T8007] Bluetooth: hci0: sending frame failed (-49) [ 993.687792][ T5] Bluetooth: hci0: command 0x1001 tx timeout [ 993.693907][ T8007] Bluetooth: hci0: sending frame failed (-49) [ 995.767799][ T22] Bluetooth: hci0: command 0x1009 tx timeout [ 999.691332][ T8003] ================================================================== [ 999.699743][ T8003] BUG: KASAN: use-after-free in kfree_skb+0x2a/0xb0 [ 999.706546][ T8003] Read of size 4 at addr ffff8880a10b94d4 by task syz-executor.0/8003 [ 999.714680][ T8003] [ 999.717030][ T8003] CPU: 0 PID: 8003 Comm: syz-executor.0 Not tainted 5.4.0-rc5+ #0 [ 999.725095][ T8003] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 999.735146][ T8003] Call Trace: [ 999.738516][ T8003] dump_stack+0x1d8/0x2f8 [ 999.742864][ T8003] print_address_description+0x75/0x5c0 [ 999.748487][ T8003] ? vprintk_func+0x158/0x170 [ 999.753157][ T8003] ? printk+0x62/0x8d [ 999.757124][ T8003] ? vprintk_emit+0x2d4/0x3a0 [ 999.761801][ T8003] __kasan_report+0x14b/0x1c0 [ 999.766508][ T8003] ? kfree_skb+0x2a/0xb0 [ 999.770737][ T8003] kasan_report+0x26/0x50 [ 999.775047][ T8003] check_memory_region+0x2cf/0x2e0 [ 999.780137][ T8003] __kasan_check_read+0x11/0x20 [ 999.785095][ T8003] kfree_skb+0x2a/0xb0 [ 999.789258][ T8003] bcsp_close+0xb1/0xf0 [ 999.794115][ T8003] hci_uart_tty_close+0x201/0x240 [ 999.799142][ T8003] ? hci_uart_tty_open+0x340/0x340 [ 999.804282][ T8003] tty_ldisc_close+0x126/0x180 [ 999.809037][ T8003] tty_ldisc_release+0x248/0x5a0 [ 999.813967][ T8003] tty_release_struct+0x2a/0xe0 [ 999.818797][ T8003] tty_release+0xce9/0xfa0 [ 999.823811][ T8003] ? tty_release_struct+0xe0/0xe0 [ 999.828851][ T8003] __fput+0x2e4/0x740 [ 999.832814][ T8003] ____fput+0x15/0x20 [ 999.836807][ T8003] task_work_run+0x17e/0x1b0 [ 999.841422][ T8003] prepare_exit_to_usermode+0x459/0x580 [ 999.846959][ T8003] syscall_return_slowpath+0x113/0x4a0 [ 999.852411][ T8003] do_syscall_64+0x11f/0x1c0 [ 999.857193][ T8003] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 999.863062][ T8003] RIP: 0033:0x413ae1 [ 999.866935][ T8003] 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 [ 999.886517][ T8003] RSP: 002b:00007ffff4f95bd0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 999.895515][ T8003] RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000413ae1 [ 999.903484][ T8003] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 [ 999.912216][ T8003] RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff [ 999.920166][ T8003] R10: 00007ffff4f95cb0 R11: 0000000000000293 R12: 000000000075c9a0 [ 999.928713][ T8003] R13: 000000000075c9a0 R14: 00000000007603f0 R15: 000000000075bfd4 [ 999.936680][ T8003] [ 999.938987][ T8003] Allocated by task 388: [ 999.943228][ T8003] __kasan_kmalloc+0x11c/0x1b0 [ 999.947980][ T8003] kasan_slab_alloc+0xf/0x20 [ 999.952584][ T8003] kmem_cache_alloc_node+0x235/0x280 [ 999.957850][ T8003] __alloc_skb+0x9f/0x500 [ 999.963206][ T8003] bcsp_recv+0x12e7/0x1720 [ 999.967624][ T8003] hci_uart_tty_receive+0x16b/0x470 [ 999.972841][ T8003] tty_ldisc_receive_buf+0x12e/0x170 [ 999.978117][ T8003] tty_port_default_receive_buf+0x82/0xb0 [ 999.983807][ T8003] flush_to_ldisc+0x328/0x550 [ 999.988523][ T8003] process_one_work+0x7ef/0x10e0 [ 999.993435][ T8003] worker_thread+0xc01/0x1630 [ 999.998126][ T8003] kthread+0x332/0x350 [ 1000.002190][ T8003] ret_from_fork+0x24/0x30 [ 1000.006595][ T8003] [ 1000.008896][ T8003] Freed by task 388: [ 1000.012789][ T8003] __kasan_slab_free+0x12a/0x1e0 [ 1000.017703][ T8003] kasan_slab_free+0xe/0x10 [ 1000.022188][ T8003] kmem_cache_free+0x81/0xf0 [ 1000.026832][ T8003] __kfree_skb+0x118/0x170 [ 1000.031223][ T8003] kfree_skb+0x6f/0xb0 [ 1000.035265][ T8003] bcsp_recv+0x99c/0x1720 [ 1000.039566][ T8003] hci_uart_tty_receive+0x16b/0x470 [ 1000.044743][ T8003] tty_ldisc_receive_buf+0x12e/0x170 [ 1000.050062][ T8003] tty_port_default_receive_buf+0x82/0xb0 [ 1000.055754][ T8003] flush_to_ldisc+0x328/0x550 [ 1000.060407][ T8003] process_one_work+0x7ef/0x10e0 [ 1000.065334][ T8003] worker_thread+0xc01/0x1630 [ 1000.070159][ T8003] kthread+0x332/0x350 [ 1000.074199][ T8003] ret_from_fork+0x24/0x30 [ 1000.078584][ T8003] [ 1000.080886][ T8003] The buggy address belongs to the object at ffff8880a10b9400 [ 1000.080886][ T8003] which belongs to the cache skbuff_head_cache of size 224 [ 1000.095522][ T8003] The buggy address is located 212 bytes inside of [ 1000.095522][ T8003] 224-byte region [ffff8880a10b9400, ffff8880a10b94e0) [ 1000.108889][ T8003] The buggy address belongs to the page: [ 1000.114589][ T8003] page:ffffea0002842e40 refcount:1 mapcount:0 mapping:ffff8880a9935c40 index:0x0 [ 1000.124014][ T8003] flags: 0x1fffc0000000200(slab) [ 1000.129190][ T8003] raw: 01fffc0000000200 ffffea000228c708 ffffea000226ab48 ffff8880a9935c40 [ 1000.137749][ T8003] raw: 0000000000000000 ffff8880a10b9040 000000010000000c 0000000000000000 [ 1000.146314][ T8003] page dumped because: kasan: bad access detected [ 1000.152699][ T8003] [ 1000.155015][ T8003] Memory state around the buggy address: [ 1000.160625][ T8003] ffff8880a10b9380: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 1000.169184][ T8003] ffff8880a10b9400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1000.177232][ T8003] >ffff8880a10b9480: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc [ 1000.185359][ T8003] ^ [ 1000.192009][ T8003] ffff8880a10b9500: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 1000.200049][ T8003] ffff8880a10b9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1000.208087][ T8003] ================================================================== [ 1000.216144][ T8003] Disabling lock debugging due to kernel taint [ 1000.222602][ T8003] Kernel panic - not syncing: panic_on_warn set ... [ 1000.229192][ T8003] CPU: 0 PID: 8003 Comm: syz-executor.0 Tainted: G B 5.4.0-rc5+ #0 [ 1000.238440][ T8003] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1000.248484][ T8003] Call Trace: [ 1000.251782][ T8003] dump_stack+0x1d8/0x2f8 [ 1000.256150][ T8003] panic+0x264/0x7a9 [ 1000.260026][ T8003] ? __kasan_report+0x195/0x1c0 [ 1000.264933][ T8003] ? trace_hardirqs_on+0x34/0x80 [ 1000.269933][ T8003] ? __kasan_report+0x195/0x1c0 [ 1000.274767][ T8003] __kasan_report+0x1bb/0x1c0 [ 1000.280157][ T8003] ? kfree_skb+0x2a/0xb0 [ 1000.284479][ T8003] kasan_report+0x26/0x50 [ 1000.288803][ T8003] check_memory_region+0x2cf/0x2e0 [ 1000.293892][ T8003] __kasan_check_read+0x11/0x20 [ 1000.299076][ T8003] kfree_skb+0x2a/0xb0 [ 1000.303118][ T8003] bcsp_close+0xb1/0xf0 [ 1000.307257][ T8003] hci_uart_tty_close+0x201/0x240 [ 1000.312284][ T8003] ? hci_uart_tty_open+0x340/0x340 [ 1000.317382][ T8003] tty_ldisc_close+0x126/0x180 [ 1000.322122][ T8003] tty_ldisc_release+0x248/0x5a0 [ 1000.327045][ T8003] tty_release_struct+0x2a/0xe0 [ 1000.331874][ T8003] tty_release+0xce9/0xfa0 [ 1000.336281][ T8003] ? tty_release_struct+0xe0/0xe0 [ 1000.341293][ T8003] __fput+0x2e4/0x740 [ 1000.345252][ T8003] ____fput+0x15/0x20 [ 1000.349218][ T8003] task_work_run+0x17e/0x1b0 [ 1000.353944][ T8003] prepare_exit_to_usermode+0x459/0x580 [ 1000.359491][ T8003] syscall_return_slowpath+0x113/0x4a0 [ 1000.364934][ T8003] do_syscall_64+0x11f/0x1c0 [ 1000.369767][ T8003] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1000.375649][ T8003] RIP: 0033:0x413ae1 [ 1000.379540][ T8003] 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 [ 1000.399654][ T8003] RSP: 002b:00007ffff4f95bd0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 1000.408213][ T8003] RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000413ae1 [ 1000.416419][ T8003] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 [ 1000.424731][ T8003] RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff [ 1000.433207][ T8003] R10: 00007ffff4f95cb0 R11: 0000000000000293 R12: 000000000075c9a0 [ 1000.441153][ T8003] R13: 000000000075c9a0 R14: 00000000007603f0 R15: 000000000075bfd4 [ 1000.450613][ T8003] Kernel Offset: disabled [ 1000.455063][ T8003] Rebooting in 86400 seconds..