[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 67.929754][ T25] audit: type=1800 audit(1583849634.426:25): pid=9614 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 67.972022][ T25] audit: type=1800 audit(1583849634.436:26): pid=9614 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 68.002268][ T25] audit: type=1800 audit(1583849634.436:27): pid=9614 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. 2020/03/10 14:29:50 parsed 1 programs 2020/03/10 14:29:51 executed programs: 0 syzkaller login: [ 1025.558427][ T9786] IPVS: ftp: loaded support on port[0] = 21 [ 1025.624120][ T9786] chnl_net:caif_netlink_parms(): no params data found [ 1025.664502][ T9786] bridge0: port 1(bridge_slave_0) entered blocking state [ 1025.672143][ T9786] bridge0: port 1(bridge_slave_0) entered disabled state [ 1025.680631][ T9786] device bridge_slave_0 entered promiscuous mode [ 1025.692805][ T9786] bridge0: port 2(bridge_slave_1) entered blocking state [ 1025.700035][ T9786] bridge0: port 2(bridge_slave_1) entered disabled state [ 1025.708777][ T9786] device bridge_slave_1 entered promiscuous mode [ 1025.733809][ T9786] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 1025.747950][ T9786] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 1025.780272][ T9786] team0: Port device team_slave_0 added [ 1025.789932][ T9786] team0: Port device team_slave_1 added [ 1025.815078][ T9786] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 1025.822479][ T9786] 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. [ 1025.848982][ T9786] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 1025.864185][ T9786] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 1025.871218][ T9786] 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. [ 1025.898152][ T9786] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 1025.984520][ T9786] device hsr_slave_0 entered promiscuous mode [ 1026.062206][ T9786] device hsr_slave_1 entered promiscuous mode [ 1026.211464][ T9786] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 1026.264881][ T9786] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 1026.315592][ T9786] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 1026.374687][ T9786] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 1026.428612][ T9786] bridge0: port 2(bridge_slave_1) entered blocking state [ 1026.435820][ T9786] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1026.443698][ T9786] bridge0: port 1(bridge_slave_0) entered blocking state [ 1026.450760][ T9786] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1026.498224][ T9786] 8021q: adding VLAN 0 to HW filter on device bond0 [ 1026.514216][ T2789] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 1026.525146][ T2789] bridge0: port 1(bridge_slave_0) entered disabled state [ 1026.533627][ T2789] bridge0: port 2(bridge_slave_1) entered disabled state [ 1026.541567][ T2789] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 1026.555080][ T9786] 8021q: adding VLAN 0 to HW filter on device team0 [ 1026.577833][ T3615] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 1026.586623][ T3615] bridge0: port 1(bridge_slave_0) entered blocking state [ 1026.593906][ T3615] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1026.614235][ T2789] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 1026.623204][ T2789] bridge0: port 2(bridge_slave_1) entered blocking state [ 1026.630288][ T2789] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1026.652820][ T3615] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_team: link becomes ready [ 1026.664135][ T3615] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 1026.672997][ T3615] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_team: link becomes ready [ 1026.681497][ T3615] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 1026.690541][ T3615] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_hsr: link becomes ready [ 1026.699241][ T3615] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 1026.707634][ T3615] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready [ 1026.716386][ T3615] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 1026.728293][ T9786] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 1026.737041][ T9797] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 1026.756107][ T2789] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 1026.764330][ T2789] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 1026.779600][ T9786] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 1026.799142][ T9797] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 1026.808059][ T9797] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 1026.828623][ T2789] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 1026.839578][ T2789] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 1026.851111][ T9786] device veth0_vlan entered promiscuous mode [ 1026.858381][ T9794] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 1026.866830][ T9794] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 1026.881425][ T9786] device veth1_vlan entered promiscuous mode [ 1026.906624][ T9797] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 1026.915807][ T9797] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 1026.924276][ T9797] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 1026.933380][ T9797] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 1026.944900][ T9786] device veth0_macvtap entered promiscuous mode [ 1026.956758][ T9786] device veth1_macvtap entered promiscuous mode [ 1026.974732][ T9786] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 1026.984123][ T9797] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 1026.993698][ T9797] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 1027.001787][ T9797] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 1027.011012][ T9797] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 1027.024108][ T9786] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 1027.032663][ T9797] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 1027.041455][ T9797] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 1027.920982][ T9880] ================================================================== [ 1027.929307][ T9880] BUG: KASAN: use-after-free in __list_add_valid+0x93/0xa0 [ 1027.936506][ T9880] Read of size 8 at addr ffff88808d1981e0 by task syz-executor.0/9880 [ 1027.944638][ T9880] [ 1027.946963][ T9880] CPU: 1 PID: 9880 Comm: syz-executor.0 Not tainted 5.6.0-rc3-next-20200228-syzkaller #0 [ 1027.956832][ T9880] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1027.966888][ T9880] Call Trace: [ 1027.970257][ T9880] dump_stack+0x188/0x20d [ 1027.974592][ T9880] ? __list_add_valid+0x93/0xa0 [ 1027.979556][ T9880] ? __list_add_valid+0x93/0xa0 [ 1027.984470][ T9880] print_address_description.constprop.0.cold+0xd3/0x315 [ 1027.991502][ T9880] ? __list_add_valid+0x93/0xa0 [ 1027.996357][ T9880] ? __list_add_valid+0x93/0xa0 [ 1028.001217][ T9880] __kasan_report.cold+0x1a/0x32 [ 1028.006157][ T9880] ? __list_add_valid+0x93/0xa0 [ 1028.011061][ T9880] kasan_report+0xe/0x20 [ 1028.015304][ T9880] __list_add_valid+0x93/0xa0 [ 1028.020063][ T9880] rdma_listen+0x681/0x910 [ 1028.024780][ T9880] ucma_listen+0x14d/0x1c0 [ 1028.029471][ T9880] ? ucma_notify+0x190/0x190 [ 1028.034589][ T9880] ? __might_fault+0x190/0x1d0 [ 1028.039652][ T9880] ? _copy_from_user+0x123/0x190 [ 1028.044888][ T9880] ? ucma_notify+0x190/0x190 [ 1028.050586][ T9880] ucma_write+0x285/0x350 [ 1028.055380][ T9880] ? ucma_open+0x270/0x270 [ 1028.060526][ T9880] ? security_file_permission+0x8a/0x370 [ 1028.066939][ T9880] ? ucma_open+0x270/0x270 [ 1028.071930][ T9880] __vfs_write+0x76/0x100 [ 1028.077104][ T9880] vfs_write+0x262/0x5c0 [ 1028.081622][ T9880] ksys_write+0x1e8/0x250 [ 1028.087106][ T9880] ? __ia32_sys_read+0xb0/0xb0 [ 1028.092358][ T9880] ? __ia32_sys_clock_settime+0x260/0x260 [ 1028.098549][ T9880] ? trace_hardirqs_off_caller+0x55/0x230 [ 1028.106274][ T9880] do_syscall_64+0xf6/0x790 [ 1028.111572][ T9880] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1028.118137][ T9880] RIP: 0033:0x45c4a9 [ 1028.122476][ T9880] 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 [ 1028.143243][ T9880] RSP: 002b:00007f027d1b2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 1028.152936][ T9880] RAX: ffffffffffffffda RBX: 00007f027d1b36d4 RCX: 000000000045c4a9 [ 1028.161439][ T9880] RDX: 0000000000000010 RSI: 0000000020000140 RDI: 0000000000000003 [ 1028.170531][ T9880] RBP: 000000000076bfc0 R08: 0000000000000000 R09: 0000000000000000 [ 1028.178632][ T9880] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 1028.186673][ T9880] R13: 0000000000000cbe R14: 00000000004cea80 R15: 000000000076bfcc [ 1028.194658][ T9880] [ 1028.196976][ T9880] Allocated by task 9821: [ 1028.201302][ T9880] save_stack+0x1b/0x40 [ 1028.205502][ T9880] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 1028.211143][ T9880] kmem_cache_alloc_trace+0x153/0x7d0 [ 1028.216540][ T9880] __rdma_create_id+0x5b/0x850 [ 1028.221302][ T9880] ucma_create_id+0x1cb/0x580 [ 1028.225969][ T9880] ucma_write+0x285/0x350 [ 1028.230293][ T9880] __vfs_write+0x76/0x100 [ 1028.234617][ T9880] vfs_write+0x262/0x5c0 [ 1028.238853][ T9880] ksys_write+0x1e8/0x250 [ 1028.243192][ T9880] do_syscall_64+0xf6/0x790 [ 1028.247690][ T9880] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1028.253570][ T9880] [ 1028.255899][ T9880] Freed by task 9821: [ 1028.259999][ T9880] save_stack+0x1b/0x40 [ 1028.264154][ T9880] __kasan_slab_free+0xf7/0x140 [ 1028.269012][ T9880] kfree+0x109/0x2b0 [ 1028.272899][ T9880] ucma_close+0x10b/0x300 [ 1028.277231][ T9880] __fput+0x2da/0x850 [ 1028.281283][ T9880] task_work_run+0x13f/0x1b0 [ 1028.285902][ T9880] exit_to_usermode_loop+0x2fa/0x360 [ 1028.291194][ T9880] do_syscall_64+0x672/0x790 [ 1028.295791][ T9880] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1028.301673][ T9880] [ 1028.304026][ T9880] The buggy address belongs to the object at ffff88808d198000 [ 1028.304026][ T9880] which belongs to the cache kmalloc-2k of size 2048 [ 1028.318080][ T9880] The buggy address is located 480 bytes inside of [ 1028.318080][ T9880] 2048-byte region [ffff88808d198000, ffff88808d198800) [ 1028.331430][ T9880] The buggy address belongs to the page: [ 1028.337131][ T9880] page:ffffea0002346600 refcount:1 mapcount:0 mapping:00000000abbe39c0 index:0x0 [ 1028.346388][ T9880] flags: 0xfffe0000000200(slab) [ 1028.351233][ T9880] raw: 00fffe0000000200 ffffea0002832448 ffffea0002a4f948 ffff8880aa000e00 [ 1028.359960][ T9880] raw: 0000000000000000 ffff88808d198000 0000000100000001 0000000000000000 [ 1028.368639][ T9880] page dumped because: kasan: bad access detected [ 1028.375157][ T9880] [ 1028.377471][ T9880] Memory state around the buggy address: [ 1028.383138][ T9880] ffff88808d198080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1028.391309][ T9880] ffff88808d198100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1028.399382][ T9880] >ffff88808d198180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1028.407445][ T9880] ^ [ 1028.414692][ T9880] ffff88808d198200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1028.423113][ T9880] ffff88808d198280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1028.431379][ T9880] ================================================================== [ 1028.439424][ T9880] Disabling lock debugging due to kernel taint [ 1028.453379][ T9880] Kernel panic - not syncing: panic_on_warn set ... [ 1028.460086][ T9880] CPU: 1 PID: 9880 Comm: syz-executor.0 Tainted: G B 5.6.0-rc3-next-20200228-syzkaller #0 [ 1028.471269][ T9880] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1028.481317][ T9880] Call Trace: [ 1028.484615][ T9880] dump_stack+0x188/0x20d [ 1028.489021][ T9880] panic+0x2e3/0x75c [ 1028.492928][ T9880] ? add_taint.cold+0x16/0x16 [ 1028.497754][ T9880] ? preempt_schedule_common+0x5e/0xc0 [ 1028.503259][ T9880] ? __list_add_valid+0x93/0xa0 [ 1028.508104][ T9880] ? ___preempt_schedule+0x16/0x18 [ 1028.513308][ T9880] ? trace_hardirqs_on+0x55/0x220 [ 1028.518326][ T9880] ? __list_add_valid+0x93/0xa0 [ 1028.523167][ T9880] end_report+0x43/0x49 [ 1028.527309][ T9880] ? __list_add_valid+0x93/0xa0 [ 1028.532151][ T9880] __kasan_report.cold+0xd/0x32 [ 1028.537124][ T9880] ? __list_add_valid+0x93/0xa0 [ 1028.541987][ T9880] kasan_report+0xe/0x20 [ 1028.546234][ T9880] __list_add_valid+0x93/0xa0 [ 1028.550910][ T9880] rdma_listen+0x681/0x910 [ 1028.555318][ T9880] ucma_listen+0x14d/0x1c0 [ 1028.559727][ T9880] ? ucma_notify+0x190/0x190 [ 1028.564313][ T9880] ? __might_fault+0x190/0x1d0 [ 1028.569073][ T9880] ? _copy_from_user+0x123/0x190 [ 1028.574049][ T9880] ? ucma_notify+0x190/0x190 [ 1028.578646][ T9880] ucma_write+0x285/0x350 [ 1028.582968][ T9880] ? ucma_open+0x270/0x270 [ 1028.587370][ T9880] ? security_file_permission+0x8a/0x370 [ 1028.593085][ T9880] ? ucma_open+0x270/0x270 [ 1028.597486][ T9880] __vfs_write+0x76/0x100 [ 1028.601803][ T9880] vfs_write+0x262/0x5c0 [ 1028.606033][ T9880] ksys_write+0x1e8/0x250 [ 1028.610356][ T9880] ? __ia32_sys_read+0xb0/0xb0 [ 1028.615227][ T9880] ? __ia32_sys_clock_settime+0x260/0x260 [ 1028.620936][ T9880] ? trace_hardirqs_off_caller+0x55/0x230 [ 1028.626647][ T9880] do_syscall_64+0xf6/0x790 [ 1028.631143][ T9880] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1028.637049][ T9880] RIP: 0033:0x45c4a9 [ 1028.640954][ T9880] 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 [ 1028.660561][ T9880] RSP: 002b:00007f027d1b2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 1028.668959][ T9880] RAX: ffffffffffffffda RBX: 00007f027d1b36d4 RCX: 000000000045c4a9 [ 1028.676916][ T9880] RDX: 0000000000000010 RSI: 0000000020000140 RDI: 0000000000000003 [ 1028.684896][ T9880] RBP: 000000000076bfc0 R08: 0000000000000000 R09: 0000000000000000 [ 1028.692856][ T9880] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 1028.700847][ T9880] R13: 0000000000000cbe R14: 00000000004cea80 R15: 000000000076bfcc [ 1028.710016][ T9880] Kernel Offset: disabled [ 1028.714346][ T9880] Rebooting in 86400 seconds..