[ 65.077618][ T26] audit: type=1800 audit(1571160153.460:33): pid=9012 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 70.232136][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 70.232150][ T26] audit: type=1400 audit(1571160158.620:41): avc: denied { map } for pid=9189 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.0.111' (ECDSA) to the list of known hosts. 2019/10/15 17:37:41 parsed 1 programs [ 972.705859][ T26] audit: type=1400 audit(1571161061.090:42): avc: denied { map } for pid=9201 comm="syz-execprog" path="/root/syz-execprog" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 972.782781][ T26] audit: type=1400 audit(1571161061.170:43): avc: denied { map } for pid=9201 comm="syz-execprog" path="/sys/kernel/debug/kcov" dev="debugfs" ino=90 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:debugfs_t:s0 tclass=file permissive=1 2019/10/15 17:37:43 executed programs: 0 [ 974.894595][ T9216] IPVS: ftp: loaded support on port[0] = 21 [ 974.957830][ T9216] chnl_net:caif_netlink_parms(): no params data found [ 974.986577][ T9216] bridge0: port 1(bridge_slave_0) entered blocking state [ 974.994252][ T9216] bridge0: port 1(bridge_slave_0) entered disabled state [ 975.002064][ T9216] device bridge_slave_0 entered promiscuous mode [ 975.009921][ T9216] bridge0: port 2(bridge_slave_1) entered blocking state [ 975.016977][ T9216] bridge0: port 2(bridge_slave_1) entered disabled state [ 975.024774][ T9216] device bridge_slave_1 entered promiscuous mode [ 975.040483][ T9216] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 975.050694][ T9216] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 975.068973][ T9216] team0: Port device team_slave_0 added [ 975.076381][ T9216] team0: Port device team_slave_1 added [ 975.141751][ T9216] device hsr_slave_0 entered promiscuous mode [ 975.179737][ T9216] device hsr_slave_1 entered promiscuous mode [ 975.227663][ T9216] bridge0: port 2(bridge_slave_1) entered blocking state [ 975.234807][ T9216] bridge0: port 2(bridge_slave_1) entered forwarding state [ 975.242493][ T9216] bridge0: port 1(bridge_slave_0) entered blocking state [ 975.249552][ T9216] bridge0: port 1(bridge_slave_0) entered forwarding state [ 975.283974][ T9216] 8021q: adding VLAN 0 to HW filter on device bond0 [ 975.295102][ T9219] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 975.314949][ T9219] bridge0: port 1(bridge_slave_0) entered disabled state [ 975.322910][ T9219] bridge0: port 2(bridge_slave_1) entered disabled state [ 975.331737][ T9219] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 975.343561][ T9216] 8021q: adding VLAN 0 to HW filter on device team0 [ 975.353796][ T2931] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 975.362692][ T2931] bridge0: port 1(bridge_slave_0) entered blocking state [ 975.369783][ T2931] bridge0: port 1(bridge_slave_0) entered forwarding state [ 975.391765][ T9220] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 975.400579][ T9220] bridge0: port 2(bridge_slave_1) entered blocking state [ 975.407645][ T9220] bridge0: port 2(bridge_slave_1) entered forwarding state [ 975.415816][ T9220] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 975.425669][ T9220] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 975.434748][ T9220] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 975.443460][ T9220] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 975.453775][ T9216] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 975.465694][ T9216] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 975.473588][ T2931] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 975.491671][ T9216] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 975.527564][ T26] audit: type=1400 audit(1571161063.910:44): avc: denied { associate } for pid=9216 comm="syz-executor.0" name="syz0" scontext=unconfined_u:object_r:unlabeled_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=filesystem permissive=1 [ 975.951566][ T2556] Bluetooth: Error in BCSP hdr checksum [ 976.220220][ T9218] Bluetooth: Error in BCSP hdr checksum [ 977.730088][ T9220] Bluetooth: hci0: command 0x1003 tx timeout [ 977.736556][ T9232] Bluetooth: hci0: sending frame failed (-49) [ 979.809425][ T2931] Bluetooth: hci0: command 0x1001 tx timeout [ 979.815543][ T9232] Bluetooth: hci0: sending frame failed (-49) [ 981.889456][ T9220] Bluetooth: hci0: command 0x1009 tx timeout [ 986.216234][ T9229] ================================================================== [ 986.224470][ T9229] BUG: KASAN: use-after-free in kfree_skb+0x38/0x3c0 [ 986.231122][ T9229] Read of size 4 at addr ffff888094527dd4 by task syz-executor.0/9229 [ 986.239252][ T9229] [ 986.241563][ T9229] CPU: 1 PID: 9229 Comm: syz-executor.0 Not tainted 5.4.0-rc3+ #0 [ 986.249340][ T9229] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 986.259406][ T9229] Call Trace: [ 986.262732][ T9229] dump_stack+0x172/0x1f0 [ 986.267037][ T9229] ? kfree_skb+0x38/0x3c0 [ 986.271348][ T9229] print_address_description.constprop.0.cold+0xd4/0x30b [ 986.278340][ T9229] ? kfree_skb+0x38/0x3c0 [ 986.282651][ T9229] ? kfree_skb+0x38/0x3c0 [ 986.286955][ T9229] __kasan_report.cold+0x1b/0x41 [ 986.291879][ T9229] ? kfree_skb+0x38/0x3c0 [ 986.296184][ T9229] kasan_report+0x12/0x20 [ 986.300539][ T9229] check_memory_region+0x134/0x1a0 [ 986.305628][ T9229] __kasan_check_read+0x11/0x20 [ 986.310456][ T9229] kfree_skb+0x38/0x3c0 [ 986.314646][ T9229] bcsp_close+0xc7/0x130 [ 986.318866][ T9229] hci_uart_tty_close+0x21e/0x280 [ 986.323863][ T9229] ? hci_uart_close+0x50/0x50 [ 986.332168][ T9229] tty_ldisc_close.isra.0+0x119/0x1a0 [ 986.337524][ T9229] tty_ldisc_kill+0x9c/0x160 [ 986.342092][ T9229] tty_ldisc_release+0xe9/0x2b0 [ 986.346918][ T9229] tty_release_struct+0x1b/0x50 [ 986.351741][ T9229] tty_release+0xbcb/0xe90 [ 986.356139][ T9229] __fput+0x2ff/0x890 [ 986.360102][ T9229] ? put_tty_driver+0x20/0x20 [ 986.364809][ T9229] ____fput+0x16/0x20 [ 986.368779][ T9229] task_work_run+0x145/0x1c0 [ 986.373360][ T9229] exit_to_usermode_loop+0x316/0x380 [ 986.378622][ T9229] do_syscall_64+0x65f/0x760 [ 986.383235][ T9229] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 986.389105][ T9229] RIP: 0033:0x413741 [ 986.392978][ T9229] 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 [ 986.412567][ T9229] RSP: 002b:00007ffc2737ce90 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 986.420952][ T9229] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000413741 [ 986.428897][ T9229] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 [ 986.436853][ T9229] RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff [ 986.444798][ T9229] R10: 00007ffc2737cf70 R11: 0000000000000293 R12: 000000000075c9a0 [ 986.452745][ T9229] R13: 000000000075c9a0 R14: 00000000007603c0 R15: 000000000075bfd4 [ 986.460701][ T9229] [ 986.463007][ T9229] Allocated by task 9218: [ 986.467328][ T9229] save_stack+0x23/0x90 [ 986.471458][ T9229] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 986.477062][ T9229] kasan_slab_alloc+0xf/0x20 [ 986.481627][ T9229] kmem_cache_alloc_node+0x138/0x740 [ 986.486931][ T9229] __alloc_skb+0xd5/0x5e0 [ 986.491246][ T9229] bcsp_recv+0x8c1/0x13a0 [ 986.495550][ T9229] hci_uart_tty_receive+0x279/0x6e0 [ 986.500733][ T9229] tty_ldisc_receive_buf+0x15f/0x1c0 [ 986.505993][ T9229] tty_port_default_receive_buf+0x7d/0xb0 [ 986.511685][ T9229] flush_to_ldisc+0x222/0x390 [ 986.516339][ T9229] process_one_work+0x9af/0x1740 [ 986.521263][ T9229] worker_thread+0x98/0xe40 [ 986.525741][ T9229] kthread+0x361/0x430 [ 986.529793][ T9229] ret_from_fork+0x24/0x30 [ 986.534360][ T9229] [ 986.536664][ T9229] Freed by task 9218: [ 986.540624][ T9229] save_stack+0x23/0x90 [ 986.544751][ T9229] __kasan_slab_free+0x102/0x150 [ 986.549662][ T9229] kasan_slab_free+0xe/0x10 [ 986.554138][ T9229] kmem_cache_free+0x86/0x320 [ 986.558788][ T9229] kfree_skbmem+0xc5/0x150 [ 986.563187][ T9229] kfree_skb+0x109/0x3c0 [ 986.567414][ T9229] bcsp_recv+0x2d8/0x13a0 [ 986.571733][ T9229] hci_uart_tty_receive+0x279/0x6e0 [ 986.576908][ T9229] tty_ldisc_receive_buf+0x15f/0x1c0 [ 986.582168][ T9229] tty_port_default_receive_buf+0x7d/0xb0 [ 986.587869][ T9229] flush_to_ldisc+0x222/0x390 [ 986.593398][ T9229] process_one_work+0x9af/0x1740 [ 986.598314][ T9229] worker_thread+0x98/0xe40 [ 986.602793][ T9229] kthread+0x361/0x430 [ 986.606840][ T9229] ret_from_fork+0x24/0x30 [ 986.611225][ T9229] [ 986.613540][ T9229] The buggy address belongs to the object at ffff888094527d00 [ 986.613540][ T9229] which belongs to the cache skbuff_head_cache of size 224 [ 986.628085][ T9229] The buggy address is located 212 bytes inside of [ 986.628085][ T9229] 224-byte region [ffff888094527d00, ffff888094527de0) [ 986.641413][ T9229] The buggy address belongs to the page: [ 986.647025][ T9229] page:ffffea00025149c0 refcount:1 mapcount:0 mapping:ffff8880a99e7a80 index:0x0 [ 986.656111][ T9229] flags: 0x1fffc0000000200(slab) [ 986.661035][ T9229] raw: 01fffc0000000200 ffffea00026fe708 ffffea00024dc708 ffff8880a99e7a80 [ 986.669596][ T9229] raw: 0000000000000000 ffff888094527080 000000010000000c 0000000000000000 [ 986.678147][ T9229] page dumped because: kasan: bad access detected [ 986.684540][ T9229] [ 986.686843][ T9229] Memory state around the buggy address: [ 986.692449][ T9229] ffff888094527c80: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 986.700505][ T9229] ffff888094527d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 986.708541][ T9229] >ffff888094527d80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc [ 986.716575][ T9229] ^ [ 986.723231][ T9229] ffff888094527e00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 986.731269][ T9229] ffff888094527e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 986.739305][ T9229] ================================================================== [ 986.747348][ T9229] Disabling lock debugging due to kernel taint [ 986.754701][ T9229] Kernel panic - not syncing: panic_on_warn set ... [ 986.761296][ T9229] CPU: 1 PID: 9229 Comm: syz-executor.0 Tainted: G B 5.4.0-rc3+ #0 [ 986.770468][ T9229] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 986.780496][ T9229] Call Trace: [ 986.783763][ T9229] dump_stack+0x172/0x1f0 [ 986.788069][ T9229] panic+0x2e3/0x75c [ 986.791938][ T9229] ? add_taint.cold+0x16/0x16 [ 986.796587][ T9229] ? kfree_skb+0x38/0x3c0 [ 986.800890][ T9229] ? preempt_schedule+0x4b/0x60 [ 986.805716][ T9229] ? ___preempt_schedule+0x16/0x20 [ 986.810801][ T9229] ? trace_hardirqs_on+0x5e/0x240 [ 986.815798][ T9229] ? kfree_skb+0x38/0x3c0 [ 986.820104][ T9229] end_report+0x47/0x4f [ 986.824231][ T9229] ? kfree_skb+0x38/0x3c0 [ 986.828532][ T9229] __kasan_report.cold+0xe/0x41 [ 986.833354][ T9229] ? kfree_skb+0x38/0x3c0 [ 986.837658][ T9229] kasan_report+0x12/0x20 [ 986.841960][ T9229] check_memory_region+0x134/0x1a0 [ 986.847044][ T9229] __kasan_check_read+0x11/0x20 [ 986.851886][ T9229] kfree_skb+0x38/0x3c0 [ 986.856039][ T9229] bcsp_close+0xc7/0x130 [ 986.860274][ T9229] hci_uart_tty_close+0x21e/0x280 [ 986.865273][ T9229] ? hci_uart_close+0x50/0x50 [ 986.869934][ T9229] tty_ldisc_close.isra.0+0x119/0x1a0 [ 986.875279][ T9229] tty_ldisc_kill+0x9c/0x160 [ 986.879845][ T9229] tty_ldisc_release+0xe9/0x2b0 [ 986.884669][ T9229] tty_release_struct+0x1b/0x50 [ 986.889501][ T9229] tty_release+0xbcb/0xe90 [ 986.893905][ T9229] __fput+0x2ff/0x890 [ 986.897862][ T9229] ? put_tty_driver+0x20/0x20 [ 986.902513][ T9229] ____fput+0x16/0x20 [ 986.906467][ T9229] task_work_run+0x145/0x1c0 [ 986.911035][ T9229] exit_to_usermode_loop+0x316/0x380 [ 986.916307][ T9229] do_syscall_64+0x65f/0x760 [ 986.920874][ T9229] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 986.926749][ T9229] RIP: 0033:0x413741 [ 986.930622][ T9229] 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 [ 986.950198][ T9229] RSP: 002b:00007ffc2737ce90 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 986.958585][ T9229] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000413741 [ 986.966530][ T9229] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 [ 986.974483][ T9229] RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff [ 986.982427][ T9229] R10: 00007ffc2737cf70 R11: 0000000000000293 R12: 000000000075c9a0 [ 986.990370][ T9229] R13: 000000000075c9a0 R14: 00000000007603c0 R15: 000000000075bfd4 [ 986.999662][ T9229] Kernel Offset: disabled [ 987.003980][ T9229] Rebooting in 86400 seconds..