[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 66.506042][ T26] audit: type=1800 audit(1583800817.553:25): pid=9542 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 66.540199][ T26] audit: type=1800 audit(1583800817.553:26): pid=9542 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 66.576064][ T26] audit: type=1800 audit(1583800817.553:27): pid=9542 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 '10.128.1.37' (ECDSA) to the list of known hosts. 2020/03/10 00:40:26 parsed 1 programs 2020/03/10 00:40:28 executed programs: 0 syzkaller login: [ 77.104818][ T9710] IPVS: ftp: loaded support on port[0] = 21 [ 77.167914][ T9710] chnl_net:caif_netlink_parms(): no params data found [ 77.211018][ T9710] bridge0: port 1(bridge_slave_0) entered blocking state [ 77.219249][ T9710] bridge0: port 1(bridge_slave_0) entered disabled state [ 77.227371][ T9710] device bridge_slave_0 entered promiscuous mode [ 77.236024][ T9710] bridge0: port 2(bridge_slave_1) entered blocking state [ 77.243347][ T9710] bridge0: port 2(bridge_slave_1) entered disabled state [ 77.251151][ T9710] device bridge_slave_1 entered promiscuous mode [ 77.269520][ T9710] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 77.280945][ T9710] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 77.301611][ T9710] team0: Port device team_slave_0 added [ 77.308972][ T9710] team0: Port device team_slave_1 added [ 77.324887][ T9710] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 77.332104][ T9710] 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. [ 77.358146][ T9710] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 77.370744][ T9710] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 77.377719][ T9710] 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. [ 77.403811][ T9710] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 77.472569][ T9710] device hsr_slave_0 entered promiscuous mode [ 77.510379][ T9710] device hsr_slave_1 entered promiscuous mode [ 77.630882][ T9710] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 77.683190][ T9710] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 77.753404][ T9710] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 77.812952][ T9710] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 77.866872][ T9710] bridge0: port 2(bridge_slave_1) entered blocking state [ 77.874124][ T9710] bridge0: port 2(bridge_slave_1) entered forwarding state [ 77.882073][ T9710] bridge0: port 1(bridge_slave_0) entered blocking state [ 77.889203][ T9710] bridge0: port 1(bridge_slave_0) entered forwarding state [ 77.937392][ T9710] 8021q: adding VLAN 0 to HW filter on device bond0 [ 77.952857][ T2688] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 77.963323][ T2688] bridge0: port 1(bridge_slave_0) entered disabled state [ 77.972337][ T2688] bridge0: port 2(bridge_slave_1) entered disabled state [ 77.981196][ T2688] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 77.994869][ T9710] 8021q: adding VLAN 0 to HW filter on device team0 [ 78.006832][ T2702] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 78.015851][ T2702] bridge0: port 1(bridge_slave_0) entered blocking state [ 78.023001][ T2702] bridge0: port 1(bridge_slave_0) entered forwarding state [ 78.034895][ T2688] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 78.044108][ T2688] bridge0: port 2(bridge_slave_1) entered blocking state [ 78.051237][ T2688] bridge0: port 2(bridge_slave_1) entered forwarding state [ 78.072164][ T2701] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 78.091104][ T2701] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 78.099481][ T2701] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 78.108207][ T2701] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 78.121656][ T2701] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 78.132478][ T9710] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 78.152442][ T2688] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 78.160611][ T2688] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 78.174218][ T9710] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 78.195784][ T2701] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 78.205820][ T2701] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 78.225213][ T2688] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 78.235604][ T2688] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 78.246450][ T9710] device veth0_vlan entered promiscuous mode [ 78.259398][ T2679] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 78.267780][ T2679] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 78.281918][ T9710] device veth1_vlan entered promiscuous mode [ 78.303981][ T2701] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 78.313156][ T2701] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 78.321861][ T2701] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 78.330763][ T2701] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 78.342673][ T9710] device veth0_macvtap entered promiscuous mode [ 78.353445][ T9710] device veth1_macvtap entered promiscuous mode [ 78.370938][ T9710] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 78.378516][ T2679] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 78.387466][ T2679] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 78.396724][ T2679] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 78.405846][ T2679] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 78.419284][ T9710] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 78.427647][ T2702] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 78.436626][ T2702] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 81.235264][ T9909] ================================================================== [ 81.243632][ T9909] BUG: KASAN: use-after-free in __list_add_valid+0x93/0xa0 [ 81.250871][ T9909] Read of size 8 at addr ffff88809f57f1e0 by task syz-executor.0/9909 [ 81.259014][ T9909] [ 81.261398][ T9909] CPU: 1 PID: 9909 Comm: syz-executor.0 Not tainted 5.6.0-rc3-next-20200228-syzkaller #0 [ 81.271297][ T9909] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 81.281399][ T9909] Call Trace: [ 81.284742][ T9909] dump_stack+0x188/0x20d [ 81.289213][ T9909] ? __list_add_valid+0x93/0xa0 [ 81.294061][ T9909] ? __list_add_valid+0x93/0xa0 [ 81.298996][ T9909] print_address_description.constprop.0.cold+0xd3/0x315 [ 81.306191][ T9909] ? __list_add_valid+0x93/0xa0 [ 81.311215][ T9909] ? __list_add_valid+0x93/0xa0 [ 81.316240][ T9909] __kasan_report.cold+0x1a/0x32 [ 81.321189][ T9909] ? __list_add_valid+0x93/0xa0 [ 81.326096][ T9909] kasan_report+0xe/0x20 [ 81.330384][ T9909] __list_add_valid+0x93/0xa0 [ 81.335357][ T9909] rdma_listen+0x681/0x910 [ 81.339858][ T9909] ucma_listen+0x14d/0x1c0 [ 81.344313][ T9909] ? ucma_notify+0x190/0x190 [ 81.349051][ T9909] ? __might_fault+0x190/0x1d0 [ 81.353822][ T9909] ? _copy_from_user+0x123/0x190 [ 81.358761][ T9909] ? ucma_notify+0x190/0x190 [ 81.363343][ T9909] ucma_write+0x285/0x350 [ 81.367690][ T9909] ? ucma_open+0x270/0x270 [ 81.372098][ T9909] ? security_file_permission+0x8a/0x370 [ 81.377719][ T9909] ? ucma_open+0x270/0x270 [ 81.382118][ T9909] __vfs_write+0x76/0x100 [ 81.386434][ T9909] vfs_write+0x262/0x5c0 [ 81.390787][ T9909] ksys_write+0x1e8/0x250 [ 81.395152][ T9909] ? __ia32_sys_read+0xb0/0xb0 [ 81.400000][ T9909] ? __ia32_sys_clock_settime+0x260/0x260 [ 81.406300][ T9909] ? trace_hardirqs_off_caller+0x55/0x230 [ 81.412135][ T9909] do_syscall_64+0xf6/0x790 [ 81.416649][ T9909] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 81.422555][ T9909] RIP: 0033:0x45c4a9 [ 81.426520][ T9909] Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 81.446473][ T9909] RSP: 002b:00007f20b93fec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 81.455130][ T9909] RAX: ffffffffffffffda RBX: 00007f20b93ff6d4 RCX: 000000000045c4a9 [ 81.463311][ T9909] RDX: 0000000000000010 RSI: 0000000020000140 RDI: 0000000000000003 [ 81.471294][ T9909] RBP: 000000000076bfc0 R08: 0000000000000000 R09: 0000000000000000 [ 81.479257][ T9909] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 81.487207][ T9909] R13: 0000000000000cbe R14: 00000000004cea80 R15: 000000000076bfcc [ 81.495173][ T9909] [ 81.497483][ T9909] Allocated by task 9728: [ 81.501894][ T9909] save_stack+0x1b/0x40 [ 81.506061][ T9909] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 81.512018][ T9909] kmem_cache_alloc_trace+0x153/0x7d0 [ 81.517391][ T9909] __rdma_create_id+0x5b/0x850 [ 81.522322][ T9909] ucma_create_id+0x1cb/0x580 [ 81.526994][ T9909] ucma_write+0x285/0x350 [ 81.531311][ T9909] __vfs_write+0x76/0x100 [ 81.535629][ T9909] vfs_write+0x262/0x5c0 [ 81.539900][ T9909] ksys_write+0x1e8/0x250 [ 81.544290][ T9909] do_syscall_64+0xf6/0x790 [ 81.548801][ T9909] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 81.554877][ T9909] [ 81.557211][ T9909] Freed by task 9728: [ 81.561180][ T9909] save_stack+0x1b/0x40 [ 81.565318][ T9909] __kasan_slab_free+0xf7/0x140 [ 81.570395][ T9909] kfree+0x109/0x2b0 [ 81.574278][ T9909] ucma_close+0x10b/0x300 [ 81.578620][ T9909] __fput+0x2da/0x850 [ 81.582738][ T9909] task_work_run+0x13f/0x1b0 [ 81.587369][ T9909] exit_to_usermode_loop+0x2fa/0x360 [ 81.592658][ T9909] do_syscall_64+0x672/0x790 [ 81.597345][ T9909] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 81.603324][ T9909] [ 81.605664][ T9909] The buggy address belongs to the object at ffff88809f57f000 [ 81.605664][ T9909] which belongs to the cache kmalloc-2k of size 2048 [ 81.619715][ T9909] The buggy address is located 480 bytes inside of [ 81.619715][ T9909] 2048-byte region [ffff88809f57f000, ffff88809f57f800) [ 81.633404][ T9909] The buggy address belongs to the page: [ 81.639174][ T9909] page:ffffea00027d5fc0 refcount:1 mapcount:0 mapping:00000000749acfbd index:0x0 [ 81.648274][ T9909] flags: 0xfffe0000000200(slab) [ 81.653183][ T9909] raw: 00fffe0000000200 ffffea0002a43c48 ffffea00029ab1c8 ffff8880aa000e00 [ 81.661771][ T9909] raw: 0000000000000000 ffff88809f57f000 0000000100000001 0000000000000000 [ 81.670347][ T9909] page dumped because: kasan: bad access detected [ 81.676758][ T9909] [ 81.679093][ T9909] Memory state around the buggy address: [ 81.684710][ T9909] ffff88809f57f080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 81.692798][ T9909] ffff88809f57f100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 81.700858][ T9909] >ffff88809f57f180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 81.709102][ T9909] ^ [ 81.716454][ T9909] ffff88809f57f200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 81.724634][ T9909] ffff88809f57f280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 81.732696][ T9909] ================================================================== [ 81.740782][ T9909] Disabling lock debugging due to kernel taint [ 81.750210][ T9909] Kernel panic - not syncing: panic_on_warn set ... [ 81.756991][ T9909] CPU: 1 PID: 9909 Comm: syz-executor.0 Tainted: G B 5.6.0-rc3-next-20200228-syzkaller #0 [ 81.768471][ T9909] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 81.778527][ T9909] Call Trace: [ 81.781816][ T9909] dump_stack+0x188/0x20d [ 81.786159][ T9909] panic+0x2e3/0x75c [ 81.790049][ T9909] ? add_taint.cold+0x16/0x16 [ 81.794722][ T9909] ? preempt_schedule_common+0x5e/0xc0 [ 81.800178][ T9909] ? __list_add_valid+0x93/0xa0 [ 81.805038][ T9909] ? ___preempt_schedule+0x16/0x18 [ 81.810149][ T9909] ? trace_hardirqs_on+0x55/0x220 [ 81.815281][ T9909] ? __list_add_valid+0x93/0xa0 [ 81.820164][ T9909] end_report+0x43/0x49 [ 81.824380][ T9909] ? __list_add_valid+0x93/0xa0 [ 81.829218][ T9909] __kasan_report.cold+0xd/0x32 [ 81.834052][ T9909] ? __list_add_valid+0x93/0xa0 [ 81.838886][ T9909] kasan_report+0xe/0x20 [ 81.843109][ T9909] __list_add_valid+0x93/0xa0 [ 81.847770][ T9909] rdma_listen+0x681/0x910 [ 81.852194][ T9909] ucma_listen+0x14d/0x1c0 [ 81.856597][ T9909] ? ucma_notify+0x190/0x190 [ 81.861165][ T9909] ? __might_fault+0x190/0x1d0 [ 81.865919][ T9909] ? _copy_from_user+0x123/0x190 [ 81.870836][ T9909] ? ucma_notify+0x190/0x190 [ 81.875405][ T9909] ucma_write+0x285/0x350 [ 81.879731][ T9909] ? ucma_open+0x270/0x270 [ 81.884144][ T9909] ? security_file_permission+0x8a/0x370 [ 81.890059][ T9909] ? ucma_open+0x270/0x270 [ 81.894481][ T9909] __vfs_write+0x76/0x100 [ 81.900207][ T9909] vfs_write+0x262/0x5c0 [ 81.904453][ T9909] ksys_write+0x1e8/0x250 [ 81.908773][ T9909] ? __ia32_sys_read+0xb0/0xb0 [ 81.913536][ T9909] ? __ia32_sys_clock_settime+0x260/0x260 [ 81.919360][ T9909] ? trace_hardirqs_off_caller+0x55/0x230 [ 81.925085][ T9909] do_syscall_64+0xf6/0x790 [ 81.929597][ T9909] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 81.935479][ T9909] RIP: 0033:0x45c4a9 [ 81.939372][ T9909] Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 81.959088][ T9909] RSP: 002b:00007f20b93fec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 81.967652][ T9909] RAX: ffffffffffffffda RBX: 00007f20b93ff6d4 RCX: 000000000045c4a9 [ 81.975737][ T9909] RDX: 0000000000000010 RSI: 0000000020000140 RDI: 0000000000000003 [ 81.983960][ T9909] RBP: 000000000076bfc0 R08: 0000000000000000 R09: 0000000000000000 [ 81.992042][ T9909] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 82.000005][ T9909] R13: 0000000000000cbe R14: 00000000004cea80 R15: 000000000076bfcc [ 82.009523][ T9909] Kernel Offset: disabled [ 82.013860][ T9909] Rebooting in 86400 seconds..