[ 86.933686][ T27] audit: type=1800 audit(1584632001.163:30): pid=9625 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.15' (ECDSA) to the list of known hosts. 2020/03/19 15:33:29 parsed 1 programs 2020/03/19 15:33:31 executed programs: 0 syzkaller login: [ 97.121575][ T9793] IPVS: ftp: loaded support on port[0] = 21 [ 97.182654][ T9793] chnl_net:caif_netlink_parms(): no params data found [ 97.225059][ T9793] bridge0: port 1(bridge_slave_0) entered blocking state [ 97.232872][ T9793] bridge0: port 1(bridge_slave_0) entered disabled state [ 97.240969][ T9793] device bridge_slave_0 entered promiscuous mode [ 97.249975][ T9793] bridge0: port 2(bridge_slave_1) entered blocking state [ 97.257213][ T9793] bridge0: port 2(bridge_slave_1) entered disabled state [ 97.264990][ T9793] device bridge_slave_1 entered promiscuous mode [ 97.283480][ T9793] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 97.294573][ T9793] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 97.315936][ T9793] team0: Port device team_slave_0 added [ 97.323711][ T9793] team0: Port device team_slave_1 added [ 97.339798][ T9793] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 97.346759][ T9793] 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. [ 97.372734][ T9793] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 97.385392][ T9793] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 97.392459][ T9793] 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. [ 97.418460][ T9793] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 97.530135][ T9793] device hsr_slave_0 entered promiscuous mode [ 97.587435][ T9793] device hsr_slave_1 entered promiscuous mode [ 97.714234][ T9793] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 97.770276][ T9793] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 97.830660][ T9793] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 97.900351][ T9793] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 97.973912][ T9793] bridge0: port 2(bridge_slave_1) entered blocking state [ 97.981179][ T9793] bridge0: port 2(bridge_slave_1) entered forwarding state [ 97.989273][ T9793] bridge0: port 1(bridge_slave_0) entered blocking state [ 97.996329][ T9793] bridge0: port 1(bridge_slave_0) entered forwarding state [ 98.041353][ T9793] 8021q: adding VLAN 0 to HW filter on device bond0 [ 98.054821][ T2780] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 98.064865][ T2780] bridge0: port 1(bridge_slave_0) entered disabled state [ 98.073483][ T2780] bridge0: port 2(bridge_slave_1) entered disabled state [ 98.081767][ T2780] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 98.096133][ T9793] 8021q: adding VLAN 0 to HW filter on device team0 [ 98.107728][ T2964] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 98.116223][ T2964] bridge0: port 1(bridge_slave_0) entered blocking state [ 98.123420][ T2964] bridge0: port 1(bridge_slave_0) entered forwarding state [ 98.148658][ T2780] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 98.158713][ T2780] bridge0: port 2(bridge_slave_1) entered blocking state [ 98.165859][ T2780] bridge0: port 2(bridge_slave_1) entered forwarding state [ 98.174332][ T2780] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 98.183654][ T2780] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 98.193179][ T2780] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 98.208148][ T2964] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_hsr: link becomes ready [ 98.216644][ T2964] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 98.225649][ T2964] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready [ 98.234469][ T2964] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 98.245095][ T9793] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 98.265069][ T2759] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 98.273276][ T2759] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 98.286316][ T9793] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 98.309325][ T2964] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 98.319173][ T2964] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 98.338601][ T2780] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 98.347168][ T2780] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 98.356436][ T2780] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 98.365402][ T2780] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 98.375472][ T9793] device veth0_vlan entered promiscuous mode [ 98.387968][ T9793] device veth1_vlan entered promiscuous mode [ 98.409597][ T2964] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 98.419607][ T2964] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 98.427943][ T2964] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 98.436383][ T2964] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 98.446904][ T9793] device veth0_macvtap entered promiscuous mode [ 98.456775][ T9793] device veth1_macvtap entered promiscuous mode [ 98.475199][ T9793] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 98.483658][ T2780] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 98.492359][ T2780] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 98.500925][ T2780] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 98.510649][ T2780] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 98.524741][ T9793] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 98.532706][ T2964] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 98.542278][ T2964] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 99.001855][ T9824] ================================================================== [ 99.010159][ T9824] BUG: KASAN: use-after-free in __list_add_valid+0x93/0xa0 [ 99.017352][ T9824] Read of size 8 at addr ffff88808c8771e0 by task syz-executor.0/9824 [ 99.025491][ T9824] [ 99.027814][ T9824] CPU: 1 PID: 9824 Comm: syz-executor.0 Not tainted 5.6.0-rc6-syzkaller #0 [ 99.036397][ T9824] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 99.046449][ T9824] Call Trace: [ 99.049747][ T9824] dump_stack+0x188/0x20d [ 99.054069][ T9824] ? __list_add_valid+0x93/0xa0 [ 99.058909][ T9824] ? __list_add_valid+0x93/0xa0 [ 99.063747][ T9824] print_address_description.constprop.0.cold+0xd3/0x315 [ 99.070815][ T9824] ? __list_add_valid+0x93/0xa0 [ 99.075687][ T9824] ? __list_add_valid+0x93/0xa0 [ 99.080646][ T9824] __kasan_report.cold+0x1a/0x32 [ 99.085590][ T9824] ? __list_add_valid+0x93/0xa0 [ 99.090455][ T9824] kasan_report+0xe/0x20 [ 99.094691][ T9824] __list_add_valid+0x93/0xa0 [ 99.099366][ T9824] rdma_listen+0x681/0x910 [ 99.103775][ T9824] ucma_listen+0x14d/0x1c0 [ 99.108180][ T9824] ? ucma_notify+0x190/0x190 [ 99.112759][ T9824] ? __might_fault+0x190/0x1d0 [ 99.117516][ T9824] ? _copy_from_user+0x123/0x190 [ 99.122500][ T9824] ? ucma_notify+0x190/0x190 [ 99.127214][ T9824] ucma_write+0x285/0x350 [ 99.131555][ T9824] ? ucma_open+0x270/0x270 [ 99.136032][ T9824] ? security_file_permission+0x8a/0x370 [ 99.141668][ T9824] ? ucma_open+0x270/0x270 [ 99.146076][ T9824] __vfs_write+0x76/0x100 [ 99.150397][ T9824] vfs_write+0x262/0x5c0 [ 99.154633][ T9824] ksys_write+0x1e8/0x250 [ 99.158967][ T9824] ? __ia32_sys_read+0xb0/0xb0 [ 99.163734][ T9824] ? __x64_sys_clock_gettime32+0x240/0x240 [ 99.169680][ T9824] ? trace_hardirqs_off_caller+0x55/0x230 [ 99.175449][ T9824] do_fast_syscall_32+0x270/0xe8f [ 99.180474][ T9824] entry_SYSENTER_compat+0x70/0x7f [ 99.185580][ T9824] [ 99.187894][ T9824] Allocated by task 9818: [ 99.192217][ T9824] save_stack+0x1b/0x80 [ 99.196351][ T9824] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 99.201965][ T9824] kmem_cache_alloc_trace+0x153/0x7d0 [ 99.207320][ T9824] __rdma_create_id+0x5b/0x850 [ 99.212065][ T9824] ucma_create_id+0x1cb/0x580 [ 99.216722][ T9824] ucma_write+0x285/0x350 [ 99.221039][ T9824] __vfs_write+0x76/0x100 [ 99.225352][ T9824] vfs_write+0x262/0x5c0 [ 99.229625][ T9824] ksys_write+0x1e8/0x250 [ 99.233949][ T9824] do_fast_syscall_32+0x270/0xe8f [ 99.239010][ T9824] entry_SYSENTER_compat+0x70/0x7f [ 99.244105][ T9824] [ 99.246412][ T9824] Freed by task 9817: [ 99.250395][ T9824] save_stack+0x1b/0x80 [ 99.254576][ T9824] __kasan_slab_free+0xf7/0x140 [ 99.259424][ T9824] kfree+0x109/0x2b0 [ 99.263307][ T9824] ucma_close+0x10b/0x300 [ 99.267621][ T9824] __fput+0x2da/0x850 [ 99.271606][ T9824] task_work_run+0x13f/0x1b0 [ 99.276192][ T9824] exit_to_usermode_loop+0x2fa/0x360 [ 99.281472][ T9824] do_fast_syscall_32+0xbef/0xe8f [ 99.286478][ T9824] entry_SYSENTER_compat+0x70/0x7f [ 99.291560][ T9824] [ 99.293873][ T9824] The buggy address belongs to the object at ffff88808c877000 [ 99.293873][ T9824] which belongs to the cache kmalloc-2k of size 2048 [ 99.307923][ T9824] The buggy address is located 480 bytes inside of [ 99.307923][ T9824] 2048-byte region [ffff88808c877000, ffff88808c877800) [ 99.321283][ T9824] The buggy address belongs to the page: [ 99.327032][ T9824] page:ffffea0002321dc0 refcount:1 mapcount:0 mapping:ffff8880aa000e00 index:0x0 [ 99.336142][ T9824] flags: 0xfffe0000000200(slab) [ 99.340983][ T9824] raw: 00fffe0000000200 ffffea00021cdb48 ffffea0002602888 ffff8880aa000e00 [ 99.349552][ T9824] raw: 0000000000000000 ffff88808c877000 0000000100000001 0000000000000000 [ 99.358125][ T9824] page dumped because: kasan: bad access detected [ 99.364596][ T9824] [ 99.366909][ T9824] Memory state around the buggy address: [ 99.372527][ T9824] ffff88808c877080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 99.380639][ T9824] ffff88808c877100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 99.388805][ T9824] >ffff88808c877180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 99.396851][ T9824] ^ [ 99.404038][ T9824] ffff88808c877200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 99.412094][ T9824] ffff88808c877280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 99.420137][ T9824] ================================================================== [ 99.428180][ T9824] Disabling lock debugging due to kernel taint [ 99.439643][ T9824] Kernel panic - not syncing: panic_on_warn set ... [ 99.446258][ T9824] CPU: 1 PID: 9824 Comm: syz-executor.0 Tainted: G B 5.6.0-rc6-syzkaller #0 [ 99.456219][ T9824] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 99.466408][ T9824] Call Trace: [ 99.469707][ T9824] dump_stack+0x188/0x20d [ 99.474069][ T9824] panic+0x2e3/0x75c [ 99.477948][ T9824] ? add_taint.cold+0x16/0x16 [ 99.482610][ T9824] ? preempt_schedule_common+0x5e/0xc0 [ 99.488069][ T9824] ? __list_add_valid+0x93/0xa0 [ 99.492919][ T9824] ? ___preempt_schedule+0x16/0x18 [ 99.498022][ T9824] ? trace_hardirqs_on+0x55/0x220 [ 99.503022][ T9824] ? __list_add_valid+0x93/0xa0 [ 99.507852][ T9824] end_report+0x43/0x49 [ 99.511989][ T9824] ? __list_add_valid+0x93/0xa0 [ 99.516820][ T9824] __kasan_report.cold+0xd/0x32 [ 99.521657][ T9824] ? __list_add_valid+0x93/0xa0 [ 99.526491][ T9824] kasan_report+0xe/0x20 [ 99.530716][ T9824] __list_add_valid+0x93/0xa0 [ 99.535375][ T9824] rdma_listen+0x681/0x910 [ 99.539772][ T9824] ucma_listen+0x14d/0x1c0 [ 99.544168][ T9824] ? ucma_notify+0x190/0x190 [ 99.548737][ T9824] ? __might_fault+0x190/0x1d0 [ 99.553482][ T9824] ? _copy_from_user+0x123/0x190 [ 99.558400][ T9824] ? ucma_notify+0x190/0x190 [ 99.562972][ T9824] ucma_write+0x285/0x350 [ 99.567289][ T9824] ? ucma_open+0x270/0x270 [ 99.571717][ T9824] ? security_file_permission+0x8a/0x370 [ 99.577384][ T9824] ? ucma_open+0x270/0x270 [ 99.581807][ T9824] __vfs_write+0x76/0x100 [ 99.586206][ T9824] vfs_write+0x262/0x5c0 [ 99.590496][ T9824] ksys_write+0x1e8/0x250 [ 99.595248][ T9824] ? __ia32_sys_read+0xb0/0xb0 [ 99.600009][ T9824] ? __x64_sys_clock_gettime32+0x240/0x240 [ 99.605829][ T9824] ? trace_hardirqs_off_caller+0x55/0x230 [ 99.611544][ T9824] do_fast_syscall_32+0x270/0xe8f [ 99.616561][ T9824] entry_SYSENTER_compat+0x70/0x7f [ 99.622868][ T9824] Kernel Offset: disabled [ 99.627197][ T9824] Rebooting in 86400 seconds..