[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 79.943128][ T26] audit: type=1800 audit(1584039627.413:25): pid=9288 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 79.984236][ T26] audit: type=1800 audit(1584039627.423:26): pid=9288 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 80.022251][ T26] audit: type=1800 audit(1584039627.423:27): pid=9288 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 '10.128.15.209' (ECDSA) to the list of known hosts. 2020/03/12 19:16:25 parsed 1 programs 2020/03/12 19:16:26 executed programs: 0 syzkaller login: [ 1039.350922][ T9459] IPVS: ftp: loaded support on port[0] = 21 [ 1039.411302][ T9459] chnl_net:caif_netlink_parms(): no params data found [ 1039.450000][ T9459] bridge0: port 1(bridge_slave_0) entered blocking state [ 1039.457379][ T9459] bridge0: port 1(bridge_slave_0) entered disabled state [ 1039.465095][ T9459] device bridge_slave_0 entered promiscuous mode [ 1039.473410][ T9459] bridge0: port 2(bridge_slave_1) entered blocking state [ 1039.480701][ T9459] bridge0: port 2(bridge_slave_1) entered disabled state [ 1039.489501][ T9459] device bridge_slave_1 entered promiscuous mode [ 1039.506454][ T9459] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 1039.518414][ T9459] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 1039.538474][ T9459] team0: Port device team_slave_0 added [ 1039.545699][ T9459] team0: Port device team_slave_1 added [ 1039.560969][ T9459] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 1039.567984][ T9459] 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. [ 1039.593918][ T9459] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 1039.606117][ T9459] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 1039.613159][ T9459] 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. [ 1039.639609][ T9459] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 1039.699102][ T9459] device hsr_slave_0 entered promiscuous mode [ 1039.736923][ T9459] device hsr_slave_1 entered promiscuous mode [ 1039.853580][ T9459] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 1039.900143][ T9459] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 1039.959692][ T9459] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 1040.019411][ T9459] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 1040.092318][ T9459] bridge0: port 2(bridge_slave_1) entered blocking state [ 1040.099458][ T9459] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1040.107109][ T9459] bridge0: port 1(bridge_slave_0) entered blocking state [ 1040.114201][ T9459] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1040.155940][ T9459] 8021q: adding VLAN 0 to HW filter on device bond0 [ 1040.170777][ T9464] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 1040.181561][ T9464] bridge0: port 1(bridge_slave_0) entered disabled state [ 1040.189620][ T9464] bridge0: port 2(bridge_slave_1) entered disabled state [ 1040.197602][ T9464] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 1040.211303][ T9459] 8021q: adding VLAN 0 to HW filter on device team0 [ 1040.221948][ T2695] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 1040.230989][ T2695] bridge0: port 1(bridge_slave_0) entered blocking state [ 1040.238074][ T2695] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1040.257829][ T9464] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 1040.266143][ T9464] bridge0: port 2(bridge_slave_1) entered blocking state [ 1040.273227][ T9464] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1040.281535][ T9464] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 1040.290396][ T9464] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 1040.307581][ T2695] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 1040.315933][ T2695] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 1040.324340][ T2695] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 1040.335122][ T9459] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 1040.354017][ T9464] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 1040.361948][ T9464] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 1040.374789][ T9459] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 1040.393832][ T2695] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 1040.415103][ T9459] device veth0_vlan entered promiscuous mode [ 1040.422220][ T2695] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 1040.431523][ T2695] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 1040.448402][ T9459] device veth1_vlan entered promiscuous mode [ 1040.455313][ T2695] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 1040.462925][ T2695] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 1040.470882][ T2695] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 1040.491872][ T9464] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 1040.500136][ T9464] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 1040.508902][ T9464] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 1040.520850][ T9459] device veth0_macvtap entered promiscuous mode [ 1040.530690][ T9459] device veth1_macvtap entered promiscuous mode [ 1040.546653][ T9459] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 1040.554015][ T2695] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 1040.562068][ T2695] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 1040.570004][ T2695] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 1040.579551][ T2695] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 1040.591809][ T9459] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 1040.599528][ T9464] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 1040.608576][ T9464] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 1040.917893][ T9482] ================================================================== [ 1040.926150][ T9482] BUG: KASAN: use-after-free in __list_add_valid+0x93/0xa0 [ 1040.933323][ T9482] Read of size 8 at addr ffff88809690f1e0 by task syz-executor.0/9482 [ 1040.941485][ T9482] [ 1040.943797][ T9482] CPU: 1 PID: 9482 Comm: syz-executor.0 Not tainted 5.6.0-rc3-next-20200228-syzkaller #0 [ 1040.953568][ T9482] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1040.963596][ T9482] Call Trace: [ 1040.966928][ T9482] dump_stack+0x188/0x20d [ 1040.971246][ T9482] ? __list_add_valid+0x93/0xa0 [ 1040.976079][ T9482] ? __list_add_valid+0x93/0xa0 [ 1040.980952][ T9482] print_address_description.constprop.0.cold+0xd3/0x315 [ 1040.987959][ T9482] ? __list_add_valid+0x93/0xa0 [ 1040.992787][ T9482] ? __list_add_valid+0x93/0xa0 [ 1040.997612][ T9482] __kasan_report.cold+0x1a/0x32 [ 1041.002529][ T9482] ? __list_add_valid+0x93/0xa0 [ 1041.007383][ T9482] kasan_report+0xe/0x20 [ 1041.011611][ T9482] __list_add_valid+0x93/0xa0 [ 1041.016357][ T9482] rdma_listen+0x681/0x910 [ 1041.020782][ T9482] ucma_listen+0x14d/0x1c0 [ 1041.025181][ T9482] ? ucma_notify+0x190/0x190 [ 1041.029779][ T9482] ? __might_fault+0x190/0x1d0 [ 1041.034521][ T9482] ? _copy_from_user+0x123/0x190 [ 1041.039451][ T9482] ? ucma_notify+0x190/0x190 [ 1041.044030][ T9482] ucma_write+0x285/0x350 [ 1041.048335][ T9482] ? ucma_open+0x270/0x270 [ 1041.052775][ T9482] ? security_file_permission+0x8a/0x370 [ 1041.058387][ T9482] ? ucma_open+0x270/0x270 [ 1041.062814][ T9482] __vfs_write+0x76/0x100 [ 1041.067140][ T9482] vfs_write+0x262/0x5c0 [ 1041.071362][ T9482] ksys_write+0x1e8/0x250 [ 1041.075667][ T9482] ? __ia32_sys_read+0xb0/0xb0 [ 1041.080428][ T9482] ? __ia32_sys_clock_settime+0x260/0x260 [ 1041.086142][ T9482] ? trace_hardirqs_off_caller+0x55/0x230 [ 1041.091849][ T9482] do_syscall_64+0xf6/0x790 [ 1041.096370][ T9482] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1041.102337][ T9482] RIP: 0033:0x45c679 [ 1041.106208][ T9482] 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 [ 1041.125793][ T9482] RSP: 002b:00007fd58980ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 1041.134178][ T9482] RAX: ffffffffffffffda RBX: 00007fd58980b6d4 RCX: 000000000045c679 [ 1041.142124][ T9482] RDX: 0000000000000010 RSI: 0000000020000140 RDI: 0000000000000003 [ 1041.150067][ T9482] RBP: 000000000076bfa0 R08: 0000000000000000 R09: 0000000000000000 [ 1041.158012][ T9482] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 1041.165961][ T9482] R13: 0000000000000cbe R14: 00000000004cec51 R15: 000000000076bfac [ 1041.173918][ T9482] [ 1041.176225][ T9482] Allocated by task 9472: [ 1041.180529][ T9482] save_stack+0x1b/0x40 [ 1041.184665][ T9482] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 1041.190271][ T9482] kmem_cache_alloc_trace+0x153/0x7d0 [ 1041.195621][ T9482] __rdma_create_id+0x5b/0x850 [ 1041.200364][ T9482] ucma_create_id+0x1cb/0x580 [ 1041.205028][ T9482] ucma_write+0x285/0x350 [ 1041.209335][ T9482] __vfs_write+0x76/0x100 [ 1041.213639][ T9482] vfs_write+0x262/0x5c0 [ 1041.217860][ T9482] ksys_write+0x1e8/0x250 [ 1041.222183][ T9482] do_syscall_64+0xf6/0x790 [ 1041.226704][ T9482] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1041.232576][ T9482] [ 1041.234885][ T9482] Freed by task 9471: [ 1041.238853][ T9482] save_stack+0x1b/0x40 [ 1041.242988][ T9482] __kasan_slab_free+0xf7/0x140 [ 1041.247813][ T9482] kfree+0x109/0x2b0 [ 1041.251685][ T9482] ucma_close+0x10b/0x300 [ 1041.255990][ T9482] __fput+0x2da/0x850 [ 1041.260010][ T9482] task_work_run+0x13f/0x1b0 [ 1041.264576][ T9482] exit_to_usermode_loop+0x2fa/0x360 [ 1041.269834][ T9482] do_syscall_64+0x672/0x790 [ 1041.274401][ T9482] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1041.280262][ T9482] [ 1041.282567][ T9482] The buggy address belongs to the object at ffff88809690f000 [ 1041.282567][ T9482] which belongs to the cache kmalloc-2k of size 2048 [ 1041.296593][ T9482] The buggy address is located 480 bytes inside of [ 1041.296593][ T9482] 2048-byte region [ffff88809690f000, ffff88809690f800) [ 1041.310009][ T9482] The buggy address belongs to the page: [ 1041.315626][ T9482] page:ffffea00025a43c0 refcount:1 mapcount:0 mapping:000000007ad11555 index:0x0 [ 1041.324709][ T9482] flags: 0xfffe0000000200(slab) [ 1041.329663][ T9482] raw: 00fffe0000000200 ffffea0002717e48 ffffea0002666248 ffff8880aa000e00 [ 1041.338225][ T9482] raw: 0000000000000000 ffff88809690f000 0000000100000001 0000000000000000 [ 1041.346823][ T9482] page dumped because: kasan: bad access detected [ 1041.353206][ T9482] [ 1041.355511][ T9482] Memory state around the buggy address: [ 1041.361170][ T9482] ffff88809690f080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1041.369207][ T9482] ffff88809690f100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1041.377254][ T9482] >ffff88809690f180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1041.385387][ T9482] ^ [ 1041.392558][ T9482] ffff88809690f200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1041.400598][ T9482] ffff88809690f280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1041.408763][ T9482] ================================================================== [ 1041.416798][ T9482] Disabling lock debugging due to kernel taint [ 1041.426924][ T9482] Kernel panic - not syncing: panic_on_warn set ... [ 1041.433517][ T9482] CPU: 1 PID: 9482 Comm: syz-executor.0 Tainted: G B 5.6.0-rc3-next-20200228-syzkaller #0 [ 1041.444716][ T9482] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1041.454744][ T9482] Call Trace: [ 1041.458061][ T9482] dump_stack+0x188/0x20d [ 1041.462425][ T9482] panic+0x2e3/0x75c [ 1041.466296][ T9482] ? add_taint.cold+0x16/0x16 [ 1041.470971][ T9482] ? preempt_schedule_common+0x5e/0xc0 [ 1041.476424][ T9482] ? __list_add_valid+0x93/0xa0 [ 1041.481293][ T9482] ? ___preempt_schedule+0x16/0x18 [ 1041.486378][ T9482] ? trace_hardirqs_on+0x55/0x220 [ 1041.491391][ T9482] ? __list_add_valid+0x93/0xa0 [ 1041.496217][ T9482] end_report+0x43/0x49 [ 1041.500349][ T9482] ? __list_add_valid+0x93/0xa0 [ 1041.505171][ T9482] __kasan_report.cold+0xd/0x32 [ 1041.510002][ T9482] ? __list_add_valid+0x93/0xa0 [ 1041.514874][ T9482] kasan_report+0xe/0x20 [ 1041.519138][ T9482] __list_add_valid+0x93/0xa0 [ 1041.523792][ T9482] rdma_listen+0x681/0x910 [ 1041.528185][ T9482] ucma_listen+0x14d/0x1c0 [ 1041.532575][ T9482] ? ucma_notify+0x190/0x190 [ 1041.537141][ T9482] ? __might_fault+0x190/0x1d0 [ 1041.541881][ T9482] ? _copy_from_user+0x123/0x190 [ 1041.546795][ T9482] ? ucma_notify+0x190/0x190 [ 1041.551363][ T9482] ucma_write+0x285/0x350 [ 1041.555711][ T9482] ? ucma_open+0x270/0x270 [ 1041.560114][ T9482] ? security_file_permission+0x8a/0x370 [ 1041.565734][ T9482] ? ucma_open+0x270/0x270 [ 1041.570124][ T9482] __vfs_write+0x76/0x100 [ 1041.574428][ T9482] vfs_write+0x262/0x5c0 [ 1041.578662][ T9482] ksys_write+0x1e8/0x250 [ 1041.582977][ T9482] ? __ia32_sys_read+0xb0/0xb0 [ 1041.587719][ T9482] ? __ia32_sys_clock_settime+0x260/0x260 [ 1041.593424][ T9482] ? trace_hardirqs_off_caller+0x55/0x230 [ 1041.599124][ T9482] do_syscall_64+0xf6/0x790 [ 1041.603603][ T9482] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1041.609469][ T9482] RIP: 0033:0x45c679 [ 1041.613337][ T9482] 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 [ 1041.632953][ T9482] RSP: 002b:00007fd58980ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 1041.641338][ T9482] RAX: ffffffffffffffda RBX: 00007fd58980b6d4 RCX: 000000000045c679 [ 1041.649284][ T9482] RDX: 0000000000000010 RSI: 0000000020000140 RDI: 0000000000000003 [ 1041.657372][ T9482] RBP: 000000000076bfa0 R08: 0000000000000000 R09: 0000000000000000 [ 1041.665321][ T9482] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 1041.673268][ T9482] R13: 0000000000000cbe R14: 00000000004cec51 R15: 000000000076bfac [ 1041.682683][ T9482] Kernel Offset: disabled [ 1041.687004][ T9482] Rebooting in 86400 seconds..