[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 62.687815][ T26] audit: type=1800 audit(1572604514.660:25): pid=8482 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 62.725667][ T26] audit: type=1800 audit(1572604514.660:26): pid=8482 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 62.763449][ T26] audit: type=1800 audit(1572604514.660:27): pid=8482 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 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. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.232' (ECDSA) to the list of known hosts. 2019/11/01 10:51:01 parsed 1 programs 2019/11/01 10:51:04 executed programs: 0 syzkaller login: [ 1012.738074][ T8649] IPVS: ftp: loaded support on port[0] = 21 [ 1012.800532][ T8649] chnl_net:caif_netlink_parms(): no params data found [ 1012.828525][ T8649] bridge0: port 1(bridge_slave_0) entered blocking state [ 1012.835720][ T8649] bridge0: port 1(bridge_slave_0) entered disabled state [ 1012.843712][ T8649] device bridge_slave_0 entered promiscuous mode [ 1012.852378][ T8649] bridge0: port 2(bridge_slave_1) entered blocking state [ 1012.859622][ T8649] bridge0: port 2(bridge_slave_1) entered disabled state [ 1012.867767][ T8649] device bridge_slave_1 entered promiscuous mode [ 1012.884004][ T8649] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 1012.895062][ T8649] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 1012.913684][ T8649] team0: Port device team_slave_0 added [ 1012.921315][ T8649] team0: Port device team_slave_1 added [ 1012.987998][ T8649] device hsr_slave_0 entered promiscuous mode [ 1013.045903][ T8649] device hsr_slave_1 entered promiscuous mode [ 1013.148033][ T8649] bridge0: port 2(bridge_slave_1) entered blocking state [ 1013.155280][ T8649] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1013.163308][ T8649] bridge0: port 1(bridge_slave_0) entered blocking state [ 1013.170435][ T8649] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1013.321635][ T8649] 8021q: adding VLAN 0 to HW filter on device bond0 [ 1013.351488][ T8651] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 1013.388108][ T8651] bridge0: port 1(bridge_slave_0) entered disabled state [ 1013.425941][ T8651] bridge0: port 2(bridge_slave_1) entered disabled state [ 1013.439490][ T8651] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 1013.490761][ T8649] 8021q: adding VLAN 0 to HW filter on device team0 [ 1013.547314][ T2877] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 1013.575949][ T2877] bridge0: port 1(bridge_slave_0) entered blocking state [ 1013.583441][ T2877] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1013.616153][ T2877] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 1013.624667][ T2877] bridge0: port 2(bridge_slave_1) entered blocking state [ 1013.631827][ T2877] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1013.697189][ T2877] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 1013.717035][ T2877] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 1013.743429][ T8649] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 1013.775681][ T8649] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 1013.809638][ T8652] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 1013.821807][ T8652] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 1013.850139][ T8652] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 1013.867090][ T8652] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 1013.888532][ T8649] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 1014.346543][ T8688] Bluetooth: Error in BCSP hdr checksum [ 1014.605874][ T7] Bluetooth: Error in BCSP hdr checksum [ 1016.156367][ T8652] Bluetooth: hci0: command 0x1003 tx timeout [ 1016.162981][ T8699] Bluetooth: hci0: sending frame failed (-49) [ 1018.235671][ T5] Bluetooth: hci0: command 0x1001 tx timeout [ 1018.241823][ T8699] Bluetooth: hci0: sending frame failed (-49) [ 1020.315673][ T8652] Bluetooth: hci0: command 0x1009 tx timeout [ 1024.719763][ T8694] ================================================================== [ 1024.728079][ T8694] BUG: KASAN: use-after-free in kfree_skb+0x38/0x3c0 [ 1024.734753][ T8694] Read of size 4 at addr ffff8880921f4514 by task syz-executor.0/8694 [ 1024.742874][ T8694] [ 1024.745188][ T8694] CPU: 1 PID: 8694 Comm: syz-executor.0 Not tainted 5.4.0-rc5+ #0 [ 1024.752967][ T8694] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1024.763000][ T8694] Call Trace: [ 1024.766342][ T8694] dump_stack+0x172/0x1f0 [ 1024.770668][ T8694] ? kfree_skb+0x38/0x3c0 [ 1024.775155][ T8694] print_address_description.constprop.0.cold+0xd4/0x30b [ 1024.782153][ T8694] ? kfree_skb+0x38/0x3c0 [ 1024.786475][ T8694] ? kfree_skb+0x38/0x3c0 [ 1024.790798][ T8694] __kasan_report.cold+0x1b/0x41 [ 1024.795714][ T8694] ? kfree_skb+0x38/0x3c0 [ 1024.800026][ T8694] kasan_report+0x12/0x20 [ 1024.804333][ T8694] check_memory_region+0x134/0x1a0 [ 1024.809420][ T8694] __kasan_check_read+0x11/0x20 [ 1024.814254][ T8694] kfree_skb+0x38/0x3c0 [ 1024.818451][ T8694] bcsp_close+0xc7/0x130 [ 1024.822674][ T8694] hci_uart_tty_close+0x21e/0x280 [ 1024.827686][ T8694] ? hci_uart_close+0x50/0x50 [ 1024.832342][ T8694] tty_ldisc_close.isra.0+0x119/0x1a0 [ 1024.837694][ T8694] tty_ldisc_kill+0x9c/0x160 [ 1024.842262][ T8694] tty_ldisc_release+0xe9/0x2b0 [ 1024.847105][ T8694] tty_release_struct+0x1b/0x50 [ 1024.851931][ T8694] tty_release+0xbcb/0xe90 [ 1024.856338][ T8694] __fput+0x2ff/0x890 [ 1024.860305][ T8694] ? put_tty_driver+0x20/0x20 [ 1024.864960][ T8694] ____fput+0x16/0x20 [ 1024.868925][ T8694] task_work_run+0x145/0x1c0 [ 1024.873522][ T8694] exit_to_usermode_loop+0x316/0x380 [ 1024.878801][ T8694] do_syscall_64+0x65f/0x760 [ 1024.883444][ T8694] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1024.889329][ T8694] RIP: 0033:0x413ae1 [ 1024.893203][ T8694] 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 [ 1024.912796][ T8694] RSP: 002b:00007ffc1aaca0e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 1024.921186][ T8694] RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000413ae1 [ 1024.929221][ T8694] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 [ 1024.937168][ T8694] RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff [ 1024.945138][ T8694] R10: 00007ffc1aaca1c0 R11: 0000000000000293 R12: 000000000075c9a0 [ 1024.953101][ T8694] R13: 000000000075c9a0 R14: 00000000007602d8 R15: 000000000075bfd4 [ 1024.961081][ T8694] [ 1024.963391][ T8694] Allocated by task 7: [ 1024.967443][ T8694] save_stack+0x23/0x90 [ 1024.971572][ T8694] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 1024.977189][ T8694] kasan_slab_alloc+0xf/0x20 [ 1024.981762][ T8694] kmem_cache_alloc_node+0x138/0x740 [ 1024.987021][ T8694] __alloc_skb+0xd5/0x5e0 [ 1024.991328][ T8694] bcsp_recv+0x8c1/0x13a0 [ 1024.995636][ T8694] hci_uart_tty_receive+0x279/0x6e0 [ 1025.000816][ T8694] tty_ldisc_receive_buf+0x15f/0x1c0 [ 1025.006104][ T8694] tty_port_default_receive_buf+0x7d/0xb0 [ 1025.011800][ T8694] flush_to_ldisc+0x222/0x390 [ 1025.016455][ T8694] process_one_work+0x9af/0x1740 [ 1025.021367][ T8694] worker_thread+0x98/0xe40 [ 1025.025853][ T8694] kthread+0x361/0x430 [ 1025.029912][ T8694] ret_from_fork+0x24/0x30 [ 1025.034299][ T8694] [ 1025.036603][ T8694] Freed by task 7: [ 1025.040300][ T8694] save_stack+0x23/0x90 [ 1025.044431][ T8694] __kasan_slab_free+0x102/0x150 [ 1025.049344][ T8694] kasan_slab_free+0xe/0x10 [ 1025.053821][ T8694] kmem_cache_free+0x86/0x320 [ 1025.058485][ T8694] kfree_skbmem+0xc5/0x150 [ 1025.062876][ T8694] kfree_skb+0x109/0x3c0 [ 1025.067094][ T8694] bcsp_recv+0x2d8/0x13a0 [ 1025.071397][ T8694] hci_uart_tty_receive+0x279/0x6e0 [ 1025.076571][ T8694] tty_ldisc_receive_buf+0x15f/0x1c0 [ 1025.081842][ T8694] tty_port_default_receive_buf+0x7d/0xb0 [ 1025.087549][ T8694] flush_to_ldisc+0x222/0x390 [ 1025.092305][ T8694] process_one_work+0x9af/0x1740 [ 1025.097228][ T8694] worker_thread+0x98/0xe40 [ 1025.101729][ T8694] kthread+0x361/0x430 [ 1025.105798][ T8694] ret_from_fork+0x24/0x30 [ 1025.110189][ T8694] [ 1025.112501][ T8694] The buggy address belongs to the object at ffff8880921f4440 [ 1025.112501][ T8694] which belongs to the cache skbuff_head_cache of size 224 [ 1025.127152][ T8694] The buggy address is located 212 bytes inside of [ 1025.127152][ T8694] 224-byte region [ffff8880921f4440, ffff8880921f4520) [ 1025.140401][ T8694] The buggy address belongs to the page: [ 1025.146040][ T8694] page:ffffea0002487d00 refcount:1 mapcount:0 mapping:ffff8880a99db8c0 index:0x0 [ 1025.155124][ T8694] flags: 0x1fffc0000000200(slab) [ 1025.160054][ T8694] raw: 01fffc0000000200 ffffea000280a788 ffffea00029e6b08 ffff8880a99db8c0 [ 1025.168616][ T8694] raw: 0000000000000000 ffff8880921f4080 000000010000000c 0000000000000000 [ 1025.177183][ T8694] page dumped because: kasan: bad access detected [ 1025.183584][ T8694] [ 1025.185886][ T8694] Memory state around the buggy address: [ 1025.191502][ T8694] ffff8880921f4400: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 1025.199548][ T8694] ffff8880921f4480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1025.207588][ T8694] >ffff8880921f4500: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 1025.215636][ T8694] ^ [ 1025.220230][ T8694] ffff8880921f4580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1025.228290][ T8694] ffff8880921f4600: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc [ 1025.236413][ T8694] ================================================================== [ 1025.244533][ T8694] Disabling lock debugging due to kernel taint [ 1025.251317][ T8694] Kernel panic - not syncing: panic_on_warn set ... [ 1025.257910][ T8694] CPU: 1 PID: 8694 Comm: syz-executor.0 Tainted: G B 5.4.0-rc5+ #0 [ 1025.267187][ T8694] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1025.277222][ T8694] Call Trace: [ 1025.282233][ T8694] dump_stack+0x172/0x1f0 [ 1025.286541][ T8694] panic+0x2e3/0x75c [ 1025.290407][ T8694] ? add_taint.cold+0x16/0x16 [ 1025.295070][ T8694] ? kfree_skb+0x38/0x3c0 [ 1025.299465][ T8694] ? preempt_schedule+0x4b/0x60 [ 1025.304302][ T8694] ? ___preempt_schedule+0x16/0x20 [ 1025.309524][ T8694] ? trace_hardirqs_on+0x5e/0x240 [ 1025.314628][ T8694] ? kfree_skb+0x38/0x3c0 [ 1025.319004][ T8694] end_report+0x47/0x4f [ 1025.323156][ T8694] ? kfree_skb+0x38/0x3c0 [ 1025.327486][ T8694] __kasan_report.cold+0xe/0x41 [ 1025.332339][ T8694] ? kfree_skb+0x38/0x3c0 [ 1025.336745][ T8694] kasan_report+0x12/0x20 [ 1025.341050][ T8694] check_memory_region+0x134/0x1a0 [ 1025.346140][ T8694] __kasan_check_read+0x11/0x20 [ 1025.350972][ T8694] kfree_skb+0x38/0x3c0 [ 1025.355102][ T8694] bcsp_close+0xc7/0x130 [ 1025.359324][ T8694] hci_uart_tty_close+0x21e/0x280 [ 1025.364325][ T8694] ? hci_uart_close+0x50/0x50 [ 1025.369089][ T8694] tty_ldisc_close.isra.0+0x119/0x1a0 [ 1025.374688][ T8694] tty_ldisc_kill+0x9c/0x160 [ 1025.379267][ T8694] tty_ldisc_release+0xe9/0x2b0 [ 1025.384096][ T8694] tty_release_struct+0x1b/0x50 [ 1025.389534][ T8694] tty_release+0xbcb/0xe90 [ 1025.393926][ T8694] __fput+0x2ff/0x890 [ 1025.397887][ T8694] ? put_tty_driver+0x20/0x20 [ 1025.402540][ T8694] ____fput+0x16/0x20 [ 1025.406498][ T8694] task_work_run+0x145/0x1c0 [ 1025.411067][ T8694] exit_to_usermode_loop+0x316/0x380 [ 1025.416334][ T8694] do_syscall_64+0x65f/0x760 [ 1025.420899][ T8694] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1025.426860][ T8694] RIP: 0033:0x413ae1 [ 1025.430731][ T8694] 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 [ 1025.450344][ T8694] RSP: 002b:00007ffc1aaca0e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 1025.458732][ T8694] RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000413ae1 [ 1025.466678][ T8694] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 [ 1025.474711][ T8694] RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff [ 1025.482745][ T8694] R10: 00007ffc1aaca1c0 R11: 0000000000000293 R12: 000000000075c9a0 [ 1025.490786][ T8694] R13: 000000000075c9a0 R14: 00000000007602d8 R15: 000000000075bfd4 [ 1025.500211][ T8694] Kernel Offset: disabled [ 1025.504539][ T8694] Rebooting in 86400 seconds..