[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 71.894329][ T26] audit: type=1800 audit(1583759802.960:25): pid=9245 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 71.914273][ T26] audit: type=1800 audit(1583759802.970:26): pid=9245 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 71.945239][ T26] audit: type=1800 audit(1583759802.970:27): pid=9245 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 '10.128.0.230' (ECDSA) to the list of known hosts. 2020/03/09 13:16:53 parsed 1 programs 2020/03/09 13:16:54 executed programs: 0 syzkaller login: [ 83.591584][ T9415] IPVS: ftp: loaded support on port[0] = 21 [ 83.651385][ T9415] chnl_net:caif_netlink_parms(): no params data found [ 83.691002][ T9415] bridge0: port 1(bridge_slave_0) entered blocking state [ 83.698390][ T9415] bridge0: port 1(bridge_slave_0) entered disabled state [ 83.706038][ T9415] device bridge_slave_0 entered promiscuous mode [ 83.714594][ T9415] bridge0: port 2(bridge_slave_1) entered blocking state [ 83.721822][ T9415] bridge0: port 2(bridge_slave_1) entered disabled state [ 83.729426][ T9415] device bridge_slave_1 entered promiscuous mode [ 83.747561][ T9415] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 83.758388][ T9415] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 83.777252][ T9415] team0: Port device team_slave_0 added [ 83.784945][ T9415] team0: Port device team_slave_1 added [ 83.800415][ T9415] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 83.807358][ T9415] 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. [ 83.834036][ T9415] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 83.846012][ T9415] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 83.852990][ T9415] 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. [ 83.878955][ T9415] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 83.950386][ T9415] device hsr_slave_0 entered promiscuous mode [ 84.008655][ T9415] device hsr_slave_1 entered promiscuous mode [ 84.114405][ T9415] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 84.171729][ T9415] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 84.231250][ T9415] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 84.270945][ T9415] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 84.334126][ T9415] bridge0: port 2(bridge_slave_1) entered blocking state [ 84.341460][ T9415] bridge0: port 2(bridge_slave_1) entered forwarding state [ 84.349212][ T9415] bridge0: port 1(bridge_slave_0) entered blocking state [ 84.356266][ T9415] bridge0: port 1(bridge_slave_0) entered forwarding state [ 84.399838][ T9415] 8021q: adding VLAN 0 to HW filter on device bond0 [ 84.412766][ T2719] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 84.422899][ T2719] bridge0: port 1(bridge_slave_0) entered disabled state [ 84.431098][ T2719] bridge0: port 2(bridge_slave_1) entered disabled state [ 84.440024][ T2719] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 84.453110][ T9415] 8021q: adding VLAN 0 to HW filter on device team0 [ 84.464416][ T3051] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 84.472959][ T3051] bridge0: port 1(bridge_slave_0) entered blocking state [ 84.480024][ T3051] bridge0: port 1(bridge_slave_0) entered forwarding state [ 84.490638][ T2719] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 84.499782][ T2719] bridge0: port 2(bridge_slave_1) entered blocking state [ 84.506949][ T2719] bridge0: port 2(bridge_slave_1) entered forwarding state [ 84.529173][ T3051] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 84.537717][ T3051] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 84.552330][ T9415] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 84.563653][ T9415] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 84.576389][ T2732] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 84.584658][ T2732] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 84.593175][ T2732] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 84.603354][ T2732] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 84.619740][ T2719] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 84.627090][ T2719] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 84.641013][ T9415] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 84.659813][ T2719] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 84.669646][ T2719] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 84.690105][ T3025] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 84.700306][ T3025] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 84.708654][ T9415] device veth0_vlan entered promiscuous mode [ 84.718818][ T3025] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 84.726406][ T3025] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 84.735625][ T9415] device veth1_vlan entered promiscuous mode [ 84.755430][ T2732] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 84.763478][ T2732] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 84.771878][ T2732] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 84.781093][ T2732] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 84.793540][ T9415] device veth0_macvtap entered promiscuous mode [ 84.803602][ T9415] device veth1_macvtap entered promiscuous mode [ 84.819545][ T9415] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 84.826883][ T3025] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 84.836024][ T3025] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 84.844106][ T3025] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 84.852576][ T3025] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 84.863840][ T9415] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 84.871918][ T2719] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 84.881521][ T2719] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 85.164428][ T9427] ================================================================== [ 85.172739][ T9427] BUG: KASAN: use-after-free in __list_add_valid+0x93/0xa0 [ 85.179911][ T9427] Read of size 8 at addr ffff888093bbe1e0 by task syz-executor.0/9427 [ 85.188088][ T9427] [ 85.190406][ T9427] CPU: 0 PID: 9427 Comm: syz-executor.0 Not tainted 5.6.0-rc5-syzkaller #0 [ 85.199358][ T9427] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 85.209394][ T9427] Call Trace: [ 85.212668][ T9427] dump_stack+0x188/0x20d [ 85.216983][ T9427] ? __list_add_valid+0x93/0xa0 [ 85.221854][ T9427] ? __list_add_valid+0x93/0xa0 [ 85.226691][ T9427] print_address_description.constprop.0.cold+0xd3/0x315 [ 85.233693][ T9427] ? __list_add_valid+0x93/0xa0 [ 85.238523][ T9427] ? __list_add_valid+0x93/0xa0 [ 85.243352][ T9427] __kasan_report.cold+0x1a/0x32 [ 85.248275][ T9427] ? __list_add_valid+0x93/0xa0 [ 85.253107][ T9427] kasan_report+0xe/0x20 [ 85.257340][ T9427] __list_add_valid+0x93/0xa0 [ 85.262000][ T9427] rdma_listen+0x681/0x910 [ 85.266400][ T9427] ucma_listen+0x14d/0x1c0 [ 85.270888][ T9427] ? ucma_notify+0x190/0x190 [ 85.275469][ T9427] ? __might_fault+0x190/0x1d0 [ 85.280227][ T9427] ? _copy_from_user+0x123/0x190 [ 85.285146][ T9427] ? ucma_notify+0x190/0x190 [ 85.289732][ T9427] ucma_write+0x285/0x350 [ 85.294054][ T9427] ? ucma_open+0x270/0x270 [ 85.298456][ T9427] ? security_file_permission+0x8a/0x370 [ 85.304069][ T9427] ? ucma_open+0x270/0x270 [ 85.308464][ T9427] __vfs_write+0x76/0x100 [ 85.312774][ T9427] vfs_write+0x262/0x5c0 [ 85.316999][ T9427] ksys_write+0x1e8/0x250 [ 85.321325][ T9427] ? __ia32_sys_read+0xb0/0xb0 [ 85.326076][ T9427] ? __ia32_sys_clock_settime+0x260/0x260 [ 85.331774][ T9427] ? trace_hardirqs_off_caller+0x55/0x230 [ 85.337495][ T9427] do_syscall_64+0xf6/0x7d0 [ 85.342070][ T9427] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 85.347937][ T9427] RIP: 0033:0x45c4a9 [ 85.351819][ T9427] 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 [ 85.371400][ T9427] RSP: 002b:00007f859864ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 85.379800][ T9427] RAX: ffffffffffffffda RBX: 00007f859864b6d4 RCX: 000000000045c4a9 [ 85.387747][ T9427] RDX: 0000000000000010 RSI: 0000000020000040 RDI: 0000000000000003 [ 85.395783][ T9427] RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 [ 85.403742][ T9427] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 85.411816][ T9427] R13: 0000000000000cbe R14: 00000000004cea80 R15: 000000000076bf2c [ 85.419780][ T9427] [ 85.422086][ T9427] Allocated by task 9425: [ 85.426435][ T9427] save_stack+0x1b/0x80 [ 85.430569][ T9427] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 85.436178][ T9427] kmem_cache_alloc_trace+0x153/0x7d0 [ 85.441526][ T9427] __rdma_create_id+0x5b/0x850 [ 85.446265][ T9427] ucma_create_id+0x1cb/0x580 [ 85.450917][ T9427] ucma_write+0x285/0x350 [ 85.455220][ T9427] __vfs_write+0x76/0x100 [ 85.459524][ T9427] vfs_write+0x262/0x5c0 [ 85.463740][ T9427] ksys_write+0x1e8/0x250 [ 85.468047][ T9427] do_syscall_64+0xf6/0x7d0 [ 85.472543][ T9427] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 85.478409][ T9427] [ 85.480736][ T9427] Freed by task 9421: [ 85.484795][ T9427] save_stack+0x1b/0x80 [ 85.488935][ T9427] __kasan_slab_free+0xf7/0x140 [ 85.493954][ T9427] kfree+0x109/0x2b0 [ 85.498467][ T9427] ucma_close+0x10b/0x300 [ 85.502823][ T9427] __fput+0x2da/0x850 [ 85.506806][ T9427] task_work_run+0x13f/0x1b0 [ 85.511466][ T9427] exit_to_usermode_loop+0x2fa/0x360 [ 85.516728][ T9427] do_syscall_64+0x6b1/0x7d0 [ 85.521294][ T9427] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 85.527154][ T9427] [ 85.529460][ T9427] The buggy address belongs to the object at ffff888093bbe000 [ 85.529460][ T9427] which belongs to the cache kmalloc-2k of size 2048 [ 85.543501][ T9427] The buggy address is located 480 bytes inside of [ 85.543501][ T9427] 2048-byte region [ffff888093bbe000, ffff888093bbe800) [ 85.556836][ T9427] The buggy address belongs to the page: [ 85.562449][ T9427] page:ffffea00024eef80 refcount:1 mapcount:0 mapping:ffff8880aa000e00 index:0x0 [ 85.571544][ T9427] flags: 0xfffe0000000200(slab) [ 85.576374][ T9427] raw: 00fffe0000000200 ffffea00029db808 ffffea0002407488 ffff8880aa000e00 [ 85.584946][ T9427] raw: 0000000000000000 ffff888093bbe000 0000000100000001 0000000000000000 [ 85.593500][ T9427] page dumped because: kasan: bad access detected [ 85.600320][ T9427] [ 85.602626][ T9427] Memory state around the buggy address: [ 85.608233][ T9427] ffff888093bbe080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 85.616381][ T9427] ffff888093bbe100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 85.624418][ T9427] >ffff888093bbe180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 85.632455][ T9427] ^ [ 85.639645][ T9427] ffff888093bbe200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 85.647682][ T9427] ffff888093bbe280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 85.655715][ T9427] ================================================================== [ 85.663747][ T9427] Disabling lock debugging due to kernel taint [ 85.674305][ T9427] Kernel panic - not syncing: panic_on_warn set ... [ 85.680900][ T9427] CPU: 0 PID: 9427 Comm: syz-executor.0 Tainted: G B 5.6.0-rc5-syzkaller #0 [ 85.690883][ T9427] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 85.701342][ T9427] Call Trace: [ 85.704618][ T9427] dump_stack+0x188/0x20d [ 85.708927][ T9427] panic+0x2e3/0x75c [ 85.712813][ T9427] ? add_taint.cold+0x16/0x16 [ 85.717478][ T9427] ? preempt_schedule_common+0x5e/0xc0 [ 85.722911][ T9427] ? __list_add_valid+0x93/0xa0 [ 85.727742][ T9427] ? ___preempt_schedule+0x16/0x18 [ 85.732829][ T9427] ? trace_hardirqs_on+0x55/0x220 [ 85.737828][ T9427] ? __list_add_valid+0x93/0xa0 [ 85.742659][ T9427] end_report+0x43/0x49 [ 85.746793][ T9427] ? __list_add_valid+0x93/0xa0 [ 85.751621][ T9427] __kasan_report.cold+0xd/0x32 [ 85.756470][ T9427] ? __list_add_valid+0x93/0xa0 [ 85.761297][ T9427] kasan_report+0xe/0x20 [ 85.765521][ T9427] __list_add_valid+0x93/0xa0 [ 85.770173][ T9427] rdma_listen+0x681/0x910 [ 85.774566][ T9427] ucma_listen+0x14d/0x1c0 [ 85.778957][ T9427] ? ucma_notify+0x190/0x190 [ 85.783529][ T9427] ? __might_fault+0x190/0x1d0 [ 85.788283][ T9427] ? _copy_from_user+0x123/0x190 [ 85.793202][ T9427] ? ucma_notify+0x190/0x190 [ 85.797771][ T9427] ucma_write+0x285/0x350 [ 85.802082][ T9427] ? ucma_open+0x270/0x270 [ 85.806480][ T9427] ? security_file_permission+0x8a/0x370 [ 85.812091][ T9427] ? ucma_open+0x270/0x270 [ 85.816482][ T9427] __vfs_write+0x76/0x100 [ 85.820792][ T9427] vfs_write+0x262/0x5c0 [ 85.825037][ T9427] ksys_write+0x1e8/0x250 [ 85.829365][ T9427] ? __ia32_sys_read+0xb0/0xb0 [ 85.834206][ T9427] ? __ia32_sys_clock_settime+0x260/0x260 [ 85.839904][ T9427] ? trace_hardirqs_off_caller+0x55/0x230 [ 85.845603][ T9427] do_syscall_64+0xf6/0x7d0 [ 85.850104][ T9427] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 85.855993][ T9427] RIP: 0033:0x45c4a9 [ 85.859916][ T9427] 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 [ 85.879507][ T9427] RSP: 002b:00007f859864ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 85.887895][ T9427] RAX: ffffffffffffffda RBX: 00007f859864b6d4 RCX: 000000000045c4a9 [ 85.895849][ T9427] RDX: 0000000000000010 RSI: 0000000020000040 RDI: 0000000000000003 [ 85.903848][ T9427] RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 [ 85.911803][ T9427] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 85.919754][ T9427] R13: 0000000000000cbe R14: 00000000004cea80 R15: 000000000076bf2c [ 85.929105][ T9427] Kernel Offset: disabled [ 85.933428][ T9427] Rebooting in 86400 seconds..