[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 93.228417][ T27] audit: type=1800 audit(1583338317.514:25): pid=9535 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 93.264510][ T27] audit: type=1800 audit(1583338317.514:26): pid=9535 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 93.291877][ T27] audit: type=1800 audit(1583338317.514:27): pid=9535 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 '10.128.1.58' (ECDSA) to the list of known hosts. 2020/03/04 16:12:05 parsed 1 programs 2020/03/04 16:12:07 executed programs: 0 syzkaller login: [ 103.168229][ T9705] IPVS: ftp: loaded support on port[0] = 21 [ 103.227528][ T9705] chnl_net:caif_netlink_parms(): no params data found [ 103.264878][ T9705] bridge0: port 1(bridge_slave_0) entered blocking state [ 103.272499][ T9705] bridge0: port 1(bridge_slave_0) entered disabled state [ 103.280446][ T9705] device bridge_slave_0 entered promiscuous mode [ 103.289025][ T9705] bridge0: port 2(bridge_slave_1) entered blocking state [ 103.296477][ T9705] bridge0: port 2(bridge_slave_1) entered disabled state [ 103.304292][ T9705] device bridge_slave_1 entered promiscuous mode [ 103.321817][ T9705] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 103.332789][ T9705] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 103.352130][ T9705] team0: Port device team_slave_0 added [ 103.359594][ T9705] team0: Port device team_slave_1 added [ 103.373520][ T9705] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 103.380648][ T9705] 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. [ 103.406851][ T9705] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 103.419228][ T9705] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 103.426352][ T9705] 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. [ 103.452502][ T9705] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 103.516841][ T9705] device hsr_slave_0 entered promiscuous mode [ 103.564697][ T9705] device hsr_slave_1 entered promiscuous mode [ 103.695755][ T9705] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 103.767014][ T9705] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 103.806547][ T9705] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 103.857264][ T9705] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 103.909333][ T9705] bridge0: port 2(bridge_slave_1) entered blocking state [ 103.916520][ T9705] bridge0: port 2(bridge_slave_1) entered forwarding state [ 103.924283][ T9705] bridge0: port 1(bridge_slave_0) entered blocking state [ 103.931411][ T9705] bridge0: port 1(bridge_slave_0) entered forwarding state [ 103.971857][ T9705] 8021q: adding VLAN 0 to HW filter on device bond0 [ 103.986472][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 103.998536][ T5] bridge0: port 1(bridge_slave_0) entered disabled state [ 104.006533][ T5] bridge0: port 2(bridge_slave_1) entered disabled state [ 104.014980][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 104.028450][ T9705] 8021q: adding VLAN 0 to HW filter on device team0 [ 104.039538][ T2722] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 104.048786][ T2722] bridge0: port 1(bridge_slave_0) entered blocking state [ 104.055928][ T2722] bridge0: port 1(bridge_slave_0) entered forwarding state [ 104.067793][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 104.077433][ T5] bridge0: port 2(bridge_slave_1) entered blocking state [ 104.084820][ T5] bridge0: port 2(bridge_slave_1) entered forwarding state [ 104.106292][ T2722] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 104.116006][ T2722] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 104.126615][ T2722] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 104.141942][ T9705] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 104.152668][ T9705] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 104.166240][ T2703] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 104.175827][ T2703] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 104.194529][ T2703] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 104.201977][ T2703] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 104.209955][ T2703] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 104.221225][ T9705] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 104.240038][ T2722] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 104.249128][ T2722] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 104.271151][ T2703] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 104.279944][ T2703] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 104.292539][ T2703] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 104.300790][ T2703] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 104.309949][ T9705] device veth0_vlan entered promiscuous mode [ 104.328323][ T9705] device veth1_vlan entered promiscuous mode [ 104.349135][ T2722] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 104.357446][ T2722] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 104.365626][ T2722] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 104.374025][ T2722] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 104.386300][ T9705] device veth0_macvtap entered promiscuous mode [ 104.396152][ T9705] device veth1_macvtap entered promiscuous mode [ 104.412898][ T9705] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 104.420391][ T2703] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 104.428644][ T2703] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 104.436780][ T2703] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 104.445883][ T2703] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 104.458205][ T9705] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 104.465959][ T2722] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 104.476272][ T2722] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 104.770202][ T9717] ================================================================== [ 104.778579][ T9717] BUG: KASAN: use-after-free in __list_add_valid+0x9a/0xa0 [ 104.785786][ T9717] Read of size 8 at addr ffff88808d35e1e0 by task syz-executor.0/9717 [ 104.794076][ T9717] [ 104.796445][ T9717] CPU: 0 PID: 9717 Comm: syz-executor.0 Not tainted 5.6.0-rc3-syzkaller #0 [ 104.805020][ T9717] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 104.815078][ T9717] Call Trace: [ 104.818396][ T9717] dump_stack+0x197/0x210 [ 104.822715][ T9717] ? __list_add_valid+0x9a/0xa0 [ 104.827561][ T9717] print_address_description.constprop.0.cold+0xd4/0x30b [ 104.834580][ T9717] ? __list_add_valid+0x9a/0xa0 [ 104.839486][ T9717] ? __list_add_valid+0x9a/0xa0 [ 104.844327][ T9717] __kasan_report.cold+0x1b/0x32 [ 104.849275][ T9717] ? __list_add_valid+0x9a/0xa0 [ 104.854709][ T9717] kasan_report+0x12/0x20 [ 104.859674][ T9717] __asan_report_load8_noabort+0x14/0x20 [ 104.865315][ T9717] __list_add_valid+0x9a/0xa0 [ 104.870011][ T9717] rdma_listen+0x6b7/0x970 [ 104.874439][ T9717] ? _raw_spin_unlock+0x28/0x40 [ 104.879343][ T9717] ucma_listen+0x14d/0x1c0 [ 104.883805][ T9717] ? ucma_notify+0x190/0x190 [ 104.888538][ T9717] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 104.894769][ T9717] ? _copy_from_user+0x12c/0x1a0 [ 104.899730][ T9717] ucma_write+0x2d7/0x3c0 [ 104.904066][ T9717] ? ucma_notify+0x190/0x190 [ 104.908780][ T9717] ? ucma_open+0x290/0x290 [ 104.913208][ T9717] ? apparmor_file_permission+0x27/0x30 [ 104.918789][ T9717] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 104.925121][ T9717] ? security_file_permission+0x8f/0x380 [ 104.930761][ T9717] __vfs_write+0x8a/0x110 [ 104.935085][ T9717] ? ucma_open+0x290/0x290 [ 104.939500][ T9717] vfs_write+0x268/0x5d0 [ 104.943761][ T9717] ksys_write+0x220/0x290 [ 104.948105][ T9717] ? __ia32_sys_read+0xb0/0xb0 [ 104.952855][ T9717] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 104.958332][ T9717] ? do_syscall_64+0x26/0x790 [ 104.963002][ T9717] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 104.969062][ T9717] ? do_syscall_64+0x26/0x790 [ 104.973748][ T9717] __x64_sys_write+0x73/0xb0 [ 104.978341][ T9717] do_syscall_64+0xfa/0x790 [ 104.982850][ T9717] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 104.988746][ T9717] RIP: 0033:0x45c479 [ 104.992702][ T9717] 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 [ 105.012683][ T9717] RSP: 002b:00007f3232e70c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 105.021081][ T9717] RAX: ffffffffffffffda RBX: 00007f3232e716d4 RCX: 000000000045c479 [ 105.029088][ T9717] RDX: 0000000000000010 RSI: 0000000020000040 RDI: 0000000000000003 [ 105.037057][ T9717] RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 [ 105.045061][ T9717] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 105.053142][ T9717] R13: 0000000000000cbe R14: 00000000004cea34 R15: 000000000076bf2c [ 105.061116][ T9717] [ 105.063429][ T9717] Allocated by task 9715: [ 105.067756][ T9717] save_stack+0x23/0x90 [ 105.071900][ T9717] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 105.077539][ T9717] kasan_kmalloc+0x9/0x10 [ 105.081870][ T9717] kmem_cache_alloc_trace+0x158/0x790 [ 105.087233][ T9717] __rdma_create_id+0x5e/0x870 [ 105.092143][ T9717] ucma_create_id+0x1de/0x620 [ 105.096812][ T9717] ucma_write+0x2d7/0x3c0 [ 105.101247][ T9717] __vfs_write+0x8a/0x110 [ 105.105711][ T9717] vfs_write+0x268/0x5d0 [ 105.109955][ T9717] ksys_write+0x220/0x290 [ 105.114285][ T9717] __x64_sys_write+0x73/0xb0 [ 105.118940][ T9717] do_syscall_64+0xfa/0x790 [ 105.123444][ T9717] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 105.129343][ T9717] [ 105.131676][ T9717] Freed by task 9712: [ 105.135647][ T9717] save_stack+0x23/0x90 [ 105.139784][ T9717] __kasan_slab_free+0x102/0x150 [ 105.144733][ T9717] kasan_slab_free+0xe/0x10 [ 105.149259][ T9717] kfree+0x10a/0x2c0 [ 105.153151][ T9717] rdma_destroy_id+0x7c6/0xdd0 [ 105.157913][ T9717] ucma_close+0x115/0x310 [ 105.162225][ T9717] __fput+0x2ff/0x890 [ 105.166199][ T9717] ____fput+0x16/0x20 [ 105.170166][ T9717] task_work_run+0x145/0x1c0 [ 105.174748][ T9717] exit_to_usermode_loop+0x316/0x380 [ 105.180017][ T9717] do_syscall_64+0x676/0x790 [ 105.184616][ T9717] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 105.190510][ T9717] [ 105.192847][ T9717] The buggy address belongs to the object at ffff88808d35e000 [ 105.192847][ T9717] which belongs to the cache kmalloc-2k of size 2048 [ 105.207008][ T9717] The buggy address is located 480 bytes inside of [ 105.207008][ T9717] 2048-byte region [ffff88808d35e000, ffff88808d35e800) [ 105.220346][ T9717] The buggy address belongs to the page: [ 105.225963][ T9717] page:ffffea000234d780 refcount:1 mapcount:0 mapping:ffff8880aa400e00 index:0x0 [ 105.235136][ T9717] flags: 0xfffe0000000200(slab) [ 105.239982][ T9717] raw: 00fffe0000000200 ffffea00023a8488 ffffea00025cdf88 ffff8880aa400e00 [ 105.248565][ T9717] raw: 0000000000000000 ffff88808d35e000 0000000100000001 0000000000000000 [ 105.257147][ T9717] page dumped because: kasan: bad access detected [ 105.263788][ T9717] [ 105.266110][ T9717] Memory state around the buggy address: [ 105.271726][ T9717] ffff88808d35e080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 105.279786][ T9717] ffff88808d35e100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 105.288276][ T9717] >ffff88808d35e180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 105.296448][ T9717] ^ [ 105.307548][ T9717] ffff88808d35e200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 105.315664][ T9717] ffff88808d35e280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 105.323706][ T9717] ================================================================== [ 105.331746][ T9717] Disabling lock debugging due to kernel taint [ 105.346032][ T9717] Kernel panic - not syncing: panic_on_warn set ... [ 105.352810][ T9717] CPU: 0 PID: 9717 Comm: syz-executor.0 Tainted: G B 5.6.0-rc3-syzkaller #0 [ 105.363055][ T9717] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 105.373122][ T9717] Call Trace: [ 105.376403][ T9717] dump_stack+0x197/0x210 [ 105.381089][ T9717] panic+0x2e3/0x75c [ 105.384972][ T9717] ? add_taint.cold+0x16/0x16 [ 105.389825][ T9717] ? __list_add_valid+0x9a/0xa0 [ 105.395568][ T9717] ? preempt_schedule+0x4b/0x60 [ 105.400680][ T9717] ? ___preempt_schedule+0x16/0x18 [ 105.406623][ T9717] ? trace_hardirqs_on+0x5e/0x240 [ 105.412083][ T9717] ? __list_add_valid+0x9a/0xa0 [ 105.417124][ T9717] end_report+0x47/0x4f [ 105.421649][ T9717] ? __list_add_valid+0x9a/0xa0 [ 105.426508][ T9717] __kasan_report.cold+0xe/0x32 [ 105.431678][ T9717] ? __list_add_valid+0x9a/0xa0 [ 105.436894][ T9717] kasan_report+0x12/0x20 [ 105.441404][ T9717] __asan_report_load8_noabort+0x14/0x20 [ 105.447229][ T9717] __list_add_valid+0x9a/0xa0 [ 105.453029][ T9717] rdma_listen+0x6b7/0x970 [ 105.457444][ T9717] ? _raw_spin_unlock+0x28/0x40 [ 105.462772][ T9717] ucma_listen+0x14d/0x1c0 [ 105.467619][ T9717] ? ucma_notify+0x190/0x190 [ 105.472574][ T9717] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 105.478987][ T9717] ? _copy_from_user+0x12c/0x1a0 [ 105.483955][ T9717] ucma_write+0x2d7/0x3c0 [ 105.488795][ T9717] ? ucma_notify+0x190/0x190 [ 105.494689][ T9717] ? ucma_open+0x290/0x290 [ 105.499094][ T9717] ? apparmor_file_permission+0x27/0x30 [ 105.504905][ T9717] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 105.511211][ T9717] ? security_file_permission+0x8f/0x380 [ 105.516843][ T9717] __vfs_write+0x8a/0x110 [ 105.521186][ T9717] ? ucma_open+0x290/0x290 [ 105.525621][ T9717] vfs_write+0x268/0x5d0 [ 105.529855][ T9717] ksys_write+0x220/0x290 [ 105.534193][ T9717] ? __ia32_sys_read+0xb0/0xb0 [ 105.538967][ T9717] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 105.544435][ T9717] ? do_syscall_64+0x26/0x790 [ 105.549208][ T9717] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 105.555278][ T9717] ? do_syscall_64+0x26/0x790 [ 105.560074][ T9717] __x64_sys_write+0x73/0xb0 [ 105.564679][ T9717] do_syscall_64+0xfa/0x790 [ 105.569751][ T9717] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 105.576337][ T9717] RIP: 0033:0x45c479 [ 105.580253][ T9717] 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 [ 105.601507][ T9717] RSP: 002b:00007f3232e70c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 105.609925][ T9717] RAX: ffffffffffffffda RBX: 00007f3232e716d4 RCX: 000000000045c479 [ 105.618526][ T9717] RDX: 0000000000000010 RSI: 0000000020000040 RDI: 0000000000000003 [ 105.626587][ T9717] RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 [ 105.634639][ T9717] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 105.643079][ T9717] R13: 0000000000000cbe R14: 00000000004cea34 R15: 000000000076bf2c [ 105.652819][ T9717] Kernel Offset: disabled [ 105.658974][ T9717] Rebooting in 86400 seconds..