[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 73.195940][ T27] audit: type=1800 audit(1584879453.475:25): pid=9297 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 73.216889][ T27] audit: type=1800 audit(1584879453.485:26): pid=9297 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 73.269106][ T27] audit: type=1800 audit(1584879453.485:27): pid=9297 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 '10.128.0.52' (ECDSA) to the list of known hosts. 2020/03/22 12:17:44 parsed 1 programs 2020/03/22 12:17:45 executed programs: 0 syzkaller login: [ 85.733385][ T9466] IPVS: ftp: loaded support on port[0] = 21 [ 85.795967][ T9466] chnl_net:caif_netlink_parms(): no params data found [ 85.838558][ T9466] bridge0: port 1(bridge_slave_0) entered blocking state [ 85.846236][ T9466] bridge0: port 1(bridge_slave_0) entered disabled state [ 85.854236][ T9466] device bridge_slave_0 entered promiscuous mode [ 85.862889][ T9466] bridge0: port 2(bridge_slave_1) entered blocking state [ 85.873769][ T9466] bridge0: port 2(bridge_slave_1) entered disabled state [ 85.881676][ T9466] device bridge_slave_1 entered promiscuous mode [ 85.900106][ T9466] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 85.911032][ T9466] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 85.931565][ T9466] team0: Port device team_slave_0 added [ 85.938951][ T9466] team0: Port device team_slave_1 added [ 85.954416][ T9466] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 85.961425][ T9466] 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. [ 85.987472][ T9466] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 86.000218][ T9466] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 86.007176][ T9466] 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. [ 86.033250][ T9466] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 86.091471][ T9466] device hsr_slave_0 entered promiscuous mode [ 86.140143][ T9466] device hsr_slave_1 entered promiscuous mode [ 86.268592][ T9466] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 86.312252][ T9466] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 86.382337][ T9466] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 86.442143][ T9466] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 86.525372][ T9466] bridge0: port 2(bridge_slave_1) entered blocking state [ 86.532639][ T9466] bridge0: port 2(bridge_slave_1) entered forwarding state [ 86.540540][ T9466] bridge0: port 1(bridge_slave_0) entered blocking state [ 86.547660][ T9466] bridge0: port 1(bridge_slave_0) entered forwarding state [ 86.594624][ T9466] 8021q: adding VLAN 0 to HW filter on device bond0 [ 86.607244][ T2831] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 86.617802][ T2831] bridge0: port 1(bridge_slave_0) entered disabled state [ 86.626309][ T2831] bridge0: port 2(bridge_slave_1) entered disabled state [ 86.634702][ T2831] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 86.648007][ T9466] 8021q: adding VLAN 0 to HW filter on device team0 [ 86.659750][ T2860] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 86.668232][ T2860] bridge0: port 1(bridge_slave_0) entered blocking state [ 86.675536][ T2860] bridge0: port 1(bridge_slave_0) entered forwarding state [ 86.686977][ T2831] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 86.696414][ T2831] bridge0: port 2(bridge_slave_1) entered blocking state [ 86.703522][ T2831] bridge0: port 2(bridge_slave_1) entered forwarding state [ 86.730305][ T2860] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 86.738893][ T2860] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 86.748318][ T2860] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 86.757493][ T2860] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 86.771062][ T9466] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 86.783611][ T9466] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 86.793412][ T2861] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 86.811691][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 86.819306][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 86.834057][ T9466] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 86.852272][ T2861] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 86.862016][ T2861] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 86.884794][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 86.893858][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 86.904406][ T9466] device veth0_vlan entered promiscuous mode [ 86.911583][ T2831] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 86.921390][ T2831] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 86.934698][ T9466] device veth1_vlan entered promiscuous mode [ 86.955925][ T2831] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 86.964632][ T2831] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 86.973593][ T2831] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 86.982763][ T2831] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 86.993451][ T9466] device veth0_macvtap entered promiscuous mode [ 87.004537][ T9466] device veth1_macvtap entered promiscuous mode [ 87.022198][ T9466] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 87.031055][ T2831] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 87.039717][ T2831] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 87.047858][ T2831] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 87.056984][ T2831] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 87.070331][ T9466] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 87.077879][ T2861] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 87.086832][ T2861] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 87.497165][ T9497] ================================================================== [ 87.505409][ T9497] BUG: KASAN: use-after-free in __list_add_valid+0x93/0xa0 [ 87.513314][ T9497] Read of size 8 at addr ffff8880a35971e0 by task syz-executor.0/9497 [ 87.521441][ T9497] [ 87.523792][ T9497] CPU: 0 PID: 9497 Comm: syz-executor.0 Not tainted 5.6.0-rc3-next-20200228-syzkaller #0 [ 87.533594][ T9497] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 87.544155][ T9497] Call Trace: [ 87.547443][ T9497] dump_stack+0x188/0x20d [ 87.551798][ T9497] ? __list_add_valid+0x93/0xa0 [ 87.556744][ T9497] ? __list_add_valid+0x93/0xa0 [ 87.561599][ T9497] print_address_description.constprop.0.cold+0xd3/0x315 [ 87.568622][ T9497] ? __list_add_valid+0x93/0xa0 [ 87.573467][ T9497] ? __list_add_valid+0x93/0xa0 [ 87.578410][ T9497] __kasan_report.cold+0x1a/0x32 [ 87.583337][ T9497] ? __list_add_valid+0x93/0xa0 [ 87.588194][ T9497] kasan_report+0xe/0x20 [ 87.592445][ T9497] __list_add_valid+0x93/0xa0 [ 87.597145][ T9497] rdma_listen+0x681/0x910 [ 87.601558][ T9497] ucma_listen+0x14d/0x1c0 [ 87.605971][ T9497] ? ucma_notify+0x190/0x190 [ 87.610549][ T9497] ? __might_fault+0x190/0x1d0 [ 87.615308][ T9497] ? _copy_from_user+0x123/0x190 [ 87.620228][ T9497] ? ucma_notify+0x190/0x190 [ 87.624817][ T9497] ucma_write+0x285/0x350 [ 87.629145][ T9497] ? ucma_open+0x270/0x270 [ 87.633549][ T9497] ? security_file_permission+0x8a/0x370 [ 87.639167][ T9497] ? ucma_open+0x270/0x270 [ 87.643563][ T9497] __vfs_write+0x76/0x100 [ 87.647878][ T9497] vfs_write+0x262/0x5c0 [ 87.652123][ T9497] ksys_write+0x1e8/0x250 [ 87.656439][ T9497] ? __ia32_sys_read+0xb0/0xb0 [ 87.661283][ T9497] ? __ia32_sys_clock_settime+0x260/0x260 [ 87.666983][ T9497] ? trace_hardirqs_off_caller+0x55/0x230 [ 87.672715][ T9497] do_syscall_64+0xf6/0x790 [ 87.677914][ T9497] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 87.683790][ T9497] RIP: 0033:0x45c849 [ 87.687665][ T9497] 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 [ 87.707566][ T9497] RSP: 002b:00007fa7d0652c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 87.720402][ T9497] RAX: ffffffffffffffda RBX: 00007fa7d06536d4 RCX: 000000000045c849 [ 87.728369][ T9497] RDX: 0000000000000010 RSI: 0000000020000040 RDI: 0000000000000003 [ 87.736330][ T9497] RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 [ 87.744284][ T9497] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 87.752239][ T9497] R13: 0000000000000cc0 R14: 00000000004cee66 R15: 000000000076bf0c [ 87.760206][ T9497] [ 87.762610][ T9497] Allocated by task 9494: [ 87.766930][ T9497] save_stack+0x1b/0x40 [ 87.773069][ T9497] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 87.778699][ T9497] kmem_cache_alloc_trace+0x153/0x7d0 [ 87.791270][ T9497] __rdma_create_id+0x5b/0x850 [ 87.796016][ T9497] ucma_create_id+0x1cb/0x580 [ 87.800674][ T9497] ucma_write+0x285/0x350 [ 87.806053][ T9497] __vfs_write+0x76/0x100 [ 87.810814][ T9497] vfs_write+0x262/0x5c0 [ 87.815047][ T9497] ksys_write+0x1e8/0x250 [ 87.819371][ T9497] do_syscall_64+0xf6/0x790 [ 87.823857][ T9497] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 87.829725][ T9497] [ 87.832046][ T9497] Freed by task 9491: [ 87.836032][ T9497] save_stack+0x1b/0x40 [ 87.840177][ T9497] __kasan_slab_free+0xf7/0x140 [ 87.845014][ T9497] kfree+0x109/0x2b0 [ 87.848900][ T9497] ucma_close+0x10b/0x300 [ 87.853221][ T9497] __fput+0x2da/0x850 [ 87.857185][ T9497] task_work_run+0x13f/0x1b0 [ 87.861773][ T9497] exit_to_usermode_loop+0x2fa/0x360 [ 87.867050][ T9497] do_syscall_64+0x672/0x790 [ 87.871631][ T9497] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 87.877498][ T9497] [ 87.879810][ T9497] The buggy address belongs to the object at ffff8880a3597000 [ 87.879810][ T9497] which belongs to the cache kmalloc-2k of size 2048 [ 87.894236][ T9497] The buggy address is located 480 bytes inside of [ 87.894236][ T9497] 2048-byte region [ffff8880a3597000, ffff8880a3597800) [ 87.908162][ T9497] The buggy address belongs to the page: [ 87.913849][ T9497] page:ffffea00028d65c0 refcount:1 mapcount:0 mapping:00000000856a6f40 index:0x0 [ 87.922965][ T9497] flags: 0xfffe0000000200(slab) [ 87.927810][ T9497] raw: 00fffe0000000200 ffffea00025bffc8 ffffea000291a688 ffff8880aa000e00 [ 87.936459][ T9497] raw: 0000000000000000 ffff8880a3597000 0000000100000001 0000000000000000 [ 87.945138][ T9497] page dumped because: kasan: bad access detected [ 87.951553][ T9497] [ 87.953867][ T9497] Memory state around the buggy address: [ 87.959485][ T9497] ffff8880a3597080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 87.967534][ T9497] ffff8880a3597100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 87.975667][ T9497] >ffff8880a3597180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 87.983711][ T9497] ^ [ 87.991104][ T9497] ffff8880a3597200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 87.999165][ T9497] ffff8880a3597280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 88.007414][ T9497] ================================================================== [ 88.015464][ T9497] Disabling lock debugging due to kernel taint [ 88.026707][ T9497] Kernel panic - not syncing: panic_on_warn set ... [ 88.033331][ T9497] CPU: 0 PID: 9497 Comm: syz-executor.0 Tainted: G B 5.6.0-rc3-next-20200228-syzkaller #0 [ 88.044541][ T9497] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 88.054589][ T9497] Call Trace: [ 88.057866][ T9497] dump_stack+0x188/0x20d [ 88.062224][ T9497] panic+0x2e3/0x75c [ 88.066314][ T9497] ? add_taint.cold+0x16/0x16 [ 88.070974][ T9497] ? preempt_schedule_common+0x5e/0xc0 [ 88.076409][ T9497] ? __list_add_valid+0x93/0xa0 [ 88.081239][ T9497] ? ___preempt_schedule+0x16/0x18 [ 88.086339][ T9497] ? trace_hardirqs_on+0x55/0x220 [ 88.091362][ T9497] ? __list_add_valid+0x93/0xa0 [ 88.096201][ T9497] end_report+0x43/0x49 [ 88.100342][ T9497] ? __list_add_valid+0x93/0xa0 [ 88.105188][ T9497] __kasan_report.cold+0xd/0x32 [ 88.110023][ T9497] ? __list_add_valid+0x93/0xa0 [ 88.114857][ T9497] kasan_report+0xe/0x20 [ 88.119079][ T9497] __list_add_valid+0x93/0xa0 [ 88.123741][ T9497] rdma_listen+0x681/0x910 [ 88.128137][ T9497] ucma_listen+0x14d/0x1c0 [ 88.132531][ T9497] ? ucma_notify+0x190/0x190 [ 88.137100][ T9497] ? __might_fault+0x190/0x1d0 [ 88.141854][ T9497] ? _copy_from_user+0x123/0x190 [ 88.146783][ T9497] ? ucma_notify+0x190/0x190 [ 88.151367][ T9497] ucma_write+0x285/0x350 [ 88.155676][ T9497] ? ucma_open+0x270/0x270 [ 88.160074][ T9497] ? security_file_permission+0x8a/0x370 [ 88.165685][ T9497] ? ucma_open+0x270/0x270 [ 88.170081][ T9497] __vfs_write+0x76/0x100 [ 88.174396][ T9497] vfs_write+0x262/0x5c0 [ 88.178631][ T9497] ksys_write+0x1e8/0x250 [ 88.182944][ T9497] ? __ia32_sys_read+0xb0/0xb0 [ 88.187700][ T9497] ? __ia32_sys_clock_settime+0x260/0x260 [ 88.193409][ T9497] ? trace_hardirqs_off_caller+0x55/0x230 [ 88.199112][ T9497] do_syscall_64+0xf6/0x790 [ 88.203600][ T9497] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 88.209467][ T9497] RIP: 0033:0x45c849 [ 88.213342][ T9497] 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 [ 88.232922][ T9497] RSP: 002b:00007fa7d0652c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 88.241313][ T9497] RAX: ffffffffffffffda RBX: 00007fa7d06536d4 RCX: 000000000045c849 [ 88.249311][ T9497] RDX: 0000000000000010 RSI: 0000000020000040 RDI: 0000000000000003 [ 88.257262][ T9497] RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 [ 88.265226][ T9497] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 88.273174][ T9497] R13: 0000000000000cc0 R14: 00000000004cee66 R15: 000000000076bf0c [ 88.282527][ T9497] Kernel Offset: disabled [ 88.286852][ T9497] Rebooting in 86400 seconds..