[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.186' (ECDSA) to the list of known hosts. 2020/03/30 07:15:49 parsed 1 programs 2020/03/30 07:15:51 executed programs: 0 syzkaller login: [ 57.673187][ T7203] IPVS: ftp: loaded support on port[0] = 21 [ 57.759736][ T7203] chnl_net:caif_netlink_parms(): no params data found [ 57.807618][ T7203] bridge0: port 1(bridge_slave_0) entered blocking state [ 57.816019][ T7203] bridge0: port 1(bridge_slave_0) entered disabled state [ 57.824835][ T7203] device bridge_slave_0 entered promiscuous mode [ 57.835326][ T7203] bridge0: port 2(bridge_slave_1) entered blocking state [ 57.842941][ T7203] bridge0: port 2(bridge_slave_1) entered disabled state [ 57.851640][ T7203] device bridge_slave_1 entered promiscuous mode [ 57.870669][ T7203] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 57.881977][ T7203] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 57.902173][ T7203] team0: Port device team_slave_0 added [ 57.909276][ T7203] team0: Port device team_slave_1 added [ 57.925923][ T7203] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 57.932996][ T7203] 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. [ 57.959799][ T7203] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 57.972690][ T7203] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 57.981891][ T7203] 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. [ 58.008474][ T7203] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 58.072836][ T7203] device hsr_slave_0 entered promiscuous mode [ 58.130126][ T7203] device hsr_slave_1 entered promiscuous mode [ 58.249942][ T7203] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 58.303067][ T7203] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 58.362325][ T7203] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 58.402599][ T7203] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 58.474000][ T7203] bridge0: port 2(bridge_slave_1) entered blocking state [ 58.481241][ T7203] bridge0: port 2(bridge_slave_1) entered forwarding state [ 58.489034][ T7203] bridge0: port 1(bridge_slave_0) entered blocking state [ 58.496189][ T7203] bridge0: port 1(bridge_slave_0) entered forwarding state [ 58.539335][ T7203] 8021q: adding VLAN 0 to HW filter on device bond0 [ 58.553393][ T2686] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 58.565151][ T2686] bridge0: port 1(bridge_slave_0) entered disabled state [ 58.573982][ T2686] bridge0: port 2(bridge_slave_1) entered disabled state [ 58.583516][ T2686] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 58.596975][ T7203] 8021q: adding VLAN 0 to HW filter on device team0 [ 58.607988][ T3218] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 58.617335][ T3218] bridge0: port 1(bridge_slave_0) entered blocking state [ 58.624467][ T3218] bridge0: port 1(bridge_slave_0) entered forwarding state [ 58.639960][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 58.648547][ T5] bridge0: port 2(bridge_slave_1) entered blocking state [ 58.655916][ T5] bridge0: port 2(bridge_slave_1) entered forwarding state [ 58.678648][ T7203] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 58.689630][ T7203] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 58.704101][ T2696] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 58.714034][ T2696] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 58.722781][ T2696] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 58.734350][ T2696] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 58.743344][ T2696] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 58.751725][ T2696] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 58.770658][ T3218] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 58.778200][ T3218] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 58.791964][ T7203] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 58.811744][ T2696] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 58.821267][ T2696] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 58.844364][ T2686] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 58.853001][ T2686] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 58.863017][ T2696] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 58.872233][ T2696] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 58.882206][ T7203] device veth0_vlan entered promiscuous mode [ 58.894233][ T7203] device veth1_vlan entered promiscuous mode [ 58.915098][ T3218] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 58.923627][ T3218] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 58.933304][ T3218] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 58.942592][ T3218] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 58.954678][ T7203] device veth0_macvtap entered promiscuous mode [ 58.964441][ T7203] device veth1_macvtap entered promiscuous mode [ 58.981800][ T7203] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 58.989278][ T2696] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 58.999309][ T2696] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 59.007738][ T2696] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 59.018027][ T2696] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 59.030304][ T7203] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 59.083656][ T2686] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 59.092885][ T2686] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 59.292014][ T7419] ================================================================== [ 59.300342][ T7419] BUG: KASAN: use-after-free in __list_add_valid+0x93/0xa0 [ 59.307718][ T7419] Read of size 8 at addr ffff8880916a61e0 by task syz-executor.0/7419 [ 59.315866][ T7419] [ 59.318210][ T7419] CPU: 1 PID: 7419 Comm: syz-executor.0 Not tainted 5.6.0-rc7-syzkaller #0 [ 59.326795][ T7419] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.336864][ T7419] Call Trace: [ 59.340167][ T7419] dump_stack+0x188/0x20d [ 59.344507][ T7419] ? __list_add_valid+0x93/0xa0 [ 59.349510][ T7419] ? __list_add_valid+0x93/0xa0 [ 59.354381][ T7419] print_address_description.constprop.0.cold+0xd3/0x315 [ 59.361536][ T7419] ? __list_add_valid+0x93/0xa0 [ 59.366387][ T7419] ? __list_add_valid+0x93/0xa0 [ 59.371286][ T7419] __kasan_report.cold+0x1a/0x32 [ 59.376319][ T7419] ? __list_add_valid+0x93/0xa0 [ 59.381176][ T7419] kasan_report+0xe/0x20 [ 59.385407][ T7419] __list_add_valid+0x93/0xa0 [ 59.390110][ T7419] rdma_listen+0x681/0x910 [ 59.394537][ T7419] ucma_listen+0x14d/0x1c0 [ 59.398956][ T7419] ? ucma_notify+0x190/0x190 [ 59.403535][ T7419] ? __might_fault+0x190/0x1d0 [ 59.408475][ T7419] ? _copy_from_user+0x123/0x190 [ 59.413404][ T7419] ? ucma_notify+0x190/0x190 [ 59.418098][ T7419] ucma_write+0x285/0x350 [ 59.422428][ T7419] ? ucma_open+0x270/0x270 [ 59.426837][ T7419] ? security_file_permission+0x8a/0x370 [ 59.432474][ T7419] ? ucma_open+0x270/0x270 [ 59.436895][ T7419] __vfs_write+0x76/0x100 [ 59.441300][ T7419] vfs_write+0x262/0x5c0 [ 59.445532][ T7419] ksys_write+0x1e8/0x250 [ 59.449968][ T7419] ? __ia32_sys_read+0xb0/0xb0 [ 59.454777][ T7419] ? __x64_sys_clock_gettime32+0x240/0x240 [ 59.460606][ T7419] ? trace_hardirqs_off_caller+0x55/0x230 [ 59.466338][ T7419] do_fast_syscall_32+0x270/0xe8f [ 59.471386][ T7419] entry_SYSENTER_compat+0x70/0x7f [ 59.476516][ T7419] [ 59.478846][ T7419] Allocated by task 7412: [ 59.483172][ T7419] save_stack+0x1b/0x80 [ 59.487311][ T7419] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 59.493090][ T7419] kmem_cache_alloc_trace+0x153/0x7d0 [ 59.498468][ T7419] __rdma_create_id+0x5b/0x850 [ 59.503222][ T7419] ucma_create_id+0x1cb/0x580 [ 59.507892][ T7419] ucma_write+0x285/0x350 [ 59.512216][ T7419] __vfs_write+0x76/0x100 [ 59.516528][ T7419] vfs_write+0x262/0x5c0 [ 59.520804][ T7419] ksys_write+0x1e8/0x250 [ 59.525120][ T7419] do_fast_syscall_32+0x270/0xe8f [ 59.530135][ T7419] entry_SYSENTER_compat+0x70/0x7f [ 59.535223][ T7419] [ 59.537531][ T7419] Freed by task 7412: [ 59.541498][ T7419] save_stack+0x1b/0x80 [ 59.545650][ T7419] __kasan_slab_free+0xf7/0x140 [ 59.550495][ T7419] kfree+0x109/0x2b0 [ 59.554386][ T7419] ucma_close+0x10b/0x300 [ 59.558708][ T7419] __fput+0x2da/0x850 [ 59.562671][ T7419] task_work_run+0x13f/0x1b0 [ 59.567253][ T7419] exit_to_usermode_loop+0x2fa/0x360 [ 59.572519][ T7419] do_fast_syscall_32+0xbef/0xe8f [ 59.577542][ T7419] entry_SYSENTER_compat+0x70/0x7f [ 59.582641][ T7419] [ 59.584986][ T7419] The buggy address belongs to the object at ffff8880916a6000 [ 59.584986][ T7419] which belongs to the cache kmalloc-2k of size 2048 [ 59.599037][ T7419] The buggy address is located 480 bytes inside of [ 59.599037][ T7419] 2048-byte region [ffff8880916a6000, ffff8880916a6800) [ 59.612378][ T7419] The buggy address belongs to the page: [ 59.618001][ T7419] page:ffffea000245a980 refcount:1 mapcount:0 mapping:ffff8880aa000e00 index:0x0 [ 59.627085][ T7419] flags: 0xfffe0000000200(slab) [ 59.631958][ T7419] raw: 00fffe0000000200 ffffea0002596648 ffffea000245a9c8 ffff8880aa000e00 [ 59.640549][ T7419] raw: 0000000000000000 ffff8880916a6000 0000000100000001 0000000000000000 [ 59.649113][ T7419] page dumped because: kasan: bad access detected [ 59.655529][ T7419] [ 59.657880][ T7419] Memory state around the buggy address: [ 59.663493][ T7419] ffff8880916a6080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 59.671537][ T7419] ffff8880916a6100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 59.679578][ T7419] >ffff8880916a6180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 59.687615][ T7419] ^ [ 59.694787][ T7419] ffff8880916a6200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 59.702840][ T7419] ffff8880916a6280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 59.710998][ T7419] ================================================================== [ 59.719049][ T7419] Disabling lock debugging due to kernel taint [ 59.728156][ T7419] Kernel panic - not syncing: panic_on_warn set ... [ 59.734799][ T7419] CPU: 1 PID: 7419 Comm: syz-executor.0 Tainted: G B 5.6.0-rc7-syzkaller #0 [ 59.744767][ T7419] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.754994][ T7419] Call Trace: [ 59.758308][ T7419] dump_stack+0x188/0x20d [ 59.762634][ T7419] panic+0x2e3/0x75c [ 59.766511][ T7419] ? add_taint.cold+0x16/0x16 [ 59.771285][ T7419] ? preempt_schedule_common+0x5e/0xc0 [ 59.776737][ T7419] ? __list_add_valid+0x93/0xa0 [ 59.781616][ T7419] ? ___preempt_schedule+0x16/0x18 [ 59.786723][ T7419] ? trace_hardirqs_on+0x55/0x220 [ 59.791750][ T7419] ? __list_add_valid+0x93/0xa0 [ 59.796584][ T7419] end_report+0x43/0x49 [ 59.800723][ T7419] ? __list_add_valid+0x93/0xa0 [ 59.805568][ T7419] __kasan_report.cold+0xd/0x32 [ 59.810474][ T7419] ? __list_add_valid+0x93/0xa0 [ 59.815443][ T7419] kasan_report+0xe/0x20 [ 59.819722][ T7419] __list_add_valid+0x93/0xa0 [ 59.824419][ T7419] rdma_listen+0x681/0x910 [ 59.828822][ T7419] ucma_listen+0x14d/0x1c0 [ 59.833240][ T7419] ? ucma_notify+0x190/0x190 [ 59.837812][ T7419] ? __might_fault+0x190/0x1d0 [ 59.842554][ T7419] ? _copy_from_user+0x123/0x190 [ 59.847487][ T7419] ? ucma_notify+0x190/0x190 [ 59.852077][ T7419] ucma_write+0x285/0x350 [ 59.856390][ T7419] ? ucma_open+0x270/0x270 [ 59.860858][ T7419] ? security_file_permission+0x8a/0x370 [ 59.866508][ T7419] ? ucma_open+0x270/0x270 [ 59.870926][ T7419] __vfs_write+0x76/0x100 [ 59.875260][ T7419] vfs_write+0x262/0x5c0 [ 59.879484][ T7419] ksys_write+0x1e8/0x250 [ 59.883795][ T7419] ? __ia32_sys_read+0xb0/0xb0 [ 59.888537][ T7419] ? __x64_sys_clock_gettime32+0x240/0x240 [ 59.896148][ T7419] ? trace_hardirqs_off_caller+0x55/0x230 [ 59.901868][ T7419] do_fast_syscall_32+0x270/0xe8f [ 59.906883][ T7419] entry_SYSENTER_compat+0x70/0x7f [ 59.913385][ T7419] Kernel Offset: disabled [ 59.917726][ T7419] Rebooting in 86400 seconds..