[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 76.213016][ T27] audit: type=1800 audit(1583333419.115:25): pid=9677 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 76.232998][ T27] audit: type=1800 audit(1583333419.115:26): pid=9677 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 76.260512][ T27] audit: type=1800 audit(1583333419.115:27): pid=9677 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 '10.128.0.161' (ECDSA) to the list of known hosts. 2020/03/04 14:50:31 parsed 1 programs 2020/03/04 14:50:33 executed programs: 0 syzkaller login: [ 90.463910][ T9847] IPVS: ftp: loaded support on port[0] = 21 [ 90.518992][ T9847] chnl_net:caif_netlink_parms(): no params data found [ 90.554659][ T9847] bridge0: port 1(bridge_slave_0) entered blocking state [ 90.562204][ T9847] bridge0: port 1(bridge_slave_0) entered disabled state [ 90.569900][ T9847] device bridge_slave_0 entered promiscuous mode [ 90.578340][ T9847] bridge0: port 2(bridge_slave_1) entered blocking state [ 90.585570][ T9847] bridge0: port 2(bridge_slave_1) entered disabled state [ 90.593243][ T9847] device bridge_slave_1 entered promiscuous mode [ 90.611272][ T9847] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 90.622980][ T9847] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 90.641854][ T9847] team0: Port device team_slave_0 added [ 90.649172][ T9847] team0: Port device team_slave_1 added [ 90.664405][ T9847] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 90.671453][ T9847] 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. [ 90.697488][ T9847] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 90.709773][ T9847] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 90.716836][ T9847] 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. [ 90.743387][ T9847] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 90.803031][ T9847] device hsr_slave_0 entered promiscuous mode [ 90.871425][ T9847] device hsr_slave_1 entered promiscuous mode [ 91.000405][ T9847] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 91.053278][ T9847] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 91.103108][ T9847] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 91.172605][ T9847] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 91.266009][ T9847] bridge0: port 2(bridge_slave_1) entered blocking state [ 91.273241][ T9847] bridge0: port 2(bridge_slave_1) entered forwarding state [ 91.281130][ T9847] bridge0: port 1(bridge_slave_0) entered blocking state [ 91.288239][ T9847] bridge0: port 1(bridge_slave_0) entered forwarding state [ 91.332818][ T9847] 8021q: adding VLAN 0 to HW filter on device bond0 [ 91.345841][ T2797] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 91.356447][ T2797] bridge0: port 1(bridge_slave_0) entered disabled state [ 91.364618][ T2797] bridge0: port 2(bridge_slave_1) entered disabled state [ 91.373224][ T2797] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 91.386238][ T9847] 8021q: adding VLAN 0 to HW filter on device team0 [ 91.396869][ T2930] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 91.406002][ T2930] bridge0: port 1(bridge_slave_0) entered blocking state [ 91.413113][ T2930] bridge0: port 1(bridge_slave_0) entered forwarding state [ 91.424833][ T2797] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 91.433736][ T2797] bridge0: port 2(bridge_slave_1) entered blocking state [ 91.440808][ T2797] bridge0: port 2(bridge_slave_1) entered forwarding state [ 91.464922][ T2782] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 91.474112][ T2782] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 91.482790][ T2782] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 91.493007][ T2782] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 91.504440][ T2931] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 91.515260][ T9847] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 91.533918][ T2930] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 91.543235][ T2930] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 91.556100][ T9847] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 91.574003][ T2930] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 91.582611][ T2930] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 91.600380][ T2782] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 91.609422][ T2782] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 91.620201][ T9847] device veth0_vlan entered promiscuous mode [ 91.626900][ T2785] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 91.634763][ T2785] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 91.647390][ T9847] device veth1_vlan entered promiscuous mode [ 91.666459][ T2930] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 91.675304][ T2930] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 91.683647][ T2930] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 91.692582][ T2930] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 91.703837][ T9847] device veth0_macvtap entered promiscuous mode [ 91.715356][ T9847] device veth1_macvtap entered promiscuous mode [ 91.731998][ T9847] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 91.739423][ T2930] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 91.749164][ T2930] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 91.757487][ T2930] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 91.766579][ T2930] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 91.779280][ T9847] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 91.787657][ T2785] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 91.796980][ T2785] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 92.081226][ T9859] ================================================================== [ 92.089561][ T9859] BUG: KASAN: use-after-free in __list_add_valid+0x9a/0xa0 [ 92.096759][ T9859] Read of size 8 at addr ffff8880972991e0 by task syz-executor.0/9859 [ 92.104976][ T9859] [ 92.107332][ T9859] CPU: 0 PID: 9859 Comm: syz-executor.0 Not tainted 5.6.0-rc3-syzkaller #0 [ 92.115907][ T9859] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 92.125950][ T9859] Call Trace: [ 92.129311][ T9859] dump_stack+0x197/0x210 [ 92.133691][ T9859] ? __list_add_valid+0x9a/0xa0 [ 92.138575][ T9859] print_address_description.constprop.0.cold+0xd4/0x30b [ 92.145848][ T9859] ? __list_add_valid+0x9a/0xa0 [ 92.150687][ T9859] ? __list_add_valid+0x9a/0xa0 [ 92.155524][ T9859] __kasan_report.cold+0x1b/0x32 [ 92.160459][ T9859] ? __list_add_valid+0x9a/0xa0 [ 92.165321][ T9859] kasan_report+0x12/0x20 [ 92.169655][ T9859] __asan_report_load8_noabort+0x14/0x20 [ 92.175291][ T9859] __list_add_valid+0x9a/0xa0 [ 92.179966][ T9859] rdma_listen+0x6b7/0x970 [ 92.184379][ T9859] ? _raw_spin_unlock+0x28/0x40 [ 92.189224][ T9859] ucma_listen+0x14d/0x1c0 [ 92.193630][ T9859] ? ucma_notify+0x190/0x190 [ 92.198233][ T9859] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 92.204459][ T9859] ? _copy_from_user+0x12c/0x1a0 [ 92.209469][ T9859] ucma_write+0x2d7/0x3c0 [ 92.213781][ T9859] ? ucma_notify+0x190/0x190 [ 92.218356][ T9859] ? ucma_open+0x290/0x290 [ 92.222758][ T9859] ? apparmor_file_permission+0x27/0x30 [ 92.228318][ T9859] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 92.234578][ T9859] ? security_file_permission+0x8f/0x380 [ 92.240233][ T9859] __vfs_write+0x8a/0x110 [ 92.244625][ T9859] ? ucma_open+0x290/0x290 [ 92.249036][ T9859] vfs_write+0x268/0x5d0 [ 92.253272][ T9859] ksys_write+0x220/0x290 [ 92.257630][ T9859] ? __ia32_sys_read+0xb0/0xb0 [ 92.262397][ T9859] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 92.267858][ T9859] ? do_fast_syscall_32+0xd1/0xe16 [ 92.273047][ T9859] ? entry_SYSENTER_compat+0x70/0x7f [ 92.278328][ T9859] ? do_fast_syscall_32+0xd1/0xe16 [ 92.283458][ T9859] __ia32_sys_write+0x71/0xb0 [ 92.288130][ T9859] do_fast_syscall_32+0x27b/0xe16 [ 92.293176][ T9859] entry_SYSENTER_compat+0x70/0x7f [ 92.298278][ T9859] RIP: 0023:0xf7f9de39 [ 92.302358][ T9859] Code: 1d 00 00 00 89 d3 5b 5e 5d c3 8b 04 24 c3 8b 1c 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 92.322010][ T9859] RSP: 002b:00000000f7f980cc EFLAGS: 00000296 ORIG_RAX: 0000000000000004 [ 92.330428][ T9859] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000040 [ 92.338447][ T9859] RDX: 0000000000000010 RSI: 0000000000000000 RDI: 0000000000000000 [ 92.346412][ T9859] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 92.354370][ T9859] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 92.362326][ T9859] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 92.370314][ T9859] [ 92.372627][ T9859] Allocated by task 9857: [ 92.376945][ T9859] save_stack+0x23/0x90 [ 92.381095][ T9859] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 92.387844][ T9859] kasan_kmalloc+0x9/0x10 [ 92.392163][ T9859] kmem_cache_alloc_trace+0x158/0x790 [ 92.397527][ T9859] __rdma_create_id+0x5e/0x870 [ 92.402276][ T9859] ucma_create_id+0x1de/0x620 [ 92.406946][ T9859] ucma_write+0x2d7/0x3c0 [ 92.411265][ T9859] __vfs_write+0x8a/0x110 [ 92.415578][ T9859] vfs_write+0x268/0x5d0 [ 92.419804][ T9859] ksys_write+0x220/0x290 [ 92.424123][ T9859] __ia32_sys_write+0x71/0xb0 [ 92.428796][ T9859] do_fast_syscall_32+0x27b/0xe16 [ 92.433871][ T9859] entry_SYSENTER_compat+0x70/0x7f [ 92.438956][ T9859] [ 92.441273][ T9859] Freed by task 9854: [ 92.445253][ T9859] save_stack+0x23/0x90 [ 92.449418][ T9859] __kasan_slab_free+0x102/0x150 [ 92.454373][ T9859] kasan_slab_free+0xe/0x10 [ 92.458862][ T9859] kfree+0x10a/0x2c0 [ 92.462737][ T9859] rdma_destroy_id+0x7c6/0xdd0 [ 92.467479][ T9859] ucma_close+0x115/0x310 [ 92.471786][ T9859] __fput+0x2ff/0x890 [ 92.475749][ T9859] ____fput+0x16/0x20 [ 92.479716][ T9859] task_work_run+0x145/0x1c0 [ 92.484289][ T9859] exit_to_usermode_loop+0x316/0x380 [ 92.489552][ T9859] do_fast_syscall_32+0xbbd/0xe16 [ 92.494557][ T9859] entry_SYSENTER_compat+0x70/0x7f [ 92.499642][ T9859] [ 92.501964][ T9859] The buggy address belongs to the object at ffff888097299000 [ 92.501964][ T9859] which belongs to the cache kmalloc-2k of size 2048 [ 92.516011][ T9859] The buggy address is located 480 bytes inside of [ 92.516011][ T9859] 2048-byte region [ffff888097299000, ffff888097299800) [ 92.529435][ T9859] The buggy address belongs to the page: [ 92.535058][ T9859] page:ffffea00025ca640 refcount:1 mapcount:0 mapping:ffff8880aa400e00 index:0x0 [ 92.544168][ T9859] flags: 0xfffe0000000200(slab) [ 92.549005][ T9859] raw: 00fffe0000000200 ffffea000269b048 ffffea00029b1608 ffff8880aa400e00 [ 92.557575][ T9859] raw: 0000000000000000 ffff888097299000 0000000100000001 0000000000000000 [ 92.566143][ T9859] page dumped because: kasan: bad access detected [ 92.572536][ T9859] [ 92.574848][ T9859] Memory state around the buggy address: [ 92.580487][ T9859] ffff888097299080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 92.588576][ T9859] ffff888097299100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 92.596649][ T9859] >ffff888097299180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 92.604692][ T9859] ^ [ 92.611870][ T9859] ffff888097299200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 92.619911][ T9859] ffff888097299280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 92.627962][ T9859] ================================================================== [ 92.636017][ T9859] Disabling lock debugging due to kernel taint [ 92.646540][ T9859] Kernel panic - not syncing: panic_on_warn set ... [ 92.653148][ T9859] CPU: 0 PID: 9859 Comm: syz-executor.0 Tainted: G B 5.6.0-rc3-syzkaller #0 [ 92.663116][ T9859] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 92.673173][ T9859] Call Trace: [ 92.676450][ T9859] dump_stack+0x197/0x210 [ 92.680764][ T9859] panic+0x2e3/0x75c [ 92.684637][ T9859] ? add_taint.cold+0x16/0x16 [ 92.689294][ T9859] ? __list_add_valid+0x9a/0xa0 [ 92.694126][ T9859] ? preempt_schedule+0x4b/0x60 [ 92.698974][ T9859] ? ___preempt_schedule+0x16/0x18 [ 92.704106][ T9859] ? trace_hardirqs_on+0x5e/0x240 [ 92.709113][ T9859] ? __list_add_valid+0x9a/0xa0 [ 92.713943][ T9859] end_report+0x47/0x4f [ 92.718093][ T9859] ? __list_add_valid+0x9a/0xa0 [ 92.722929][ T9859] __kasan_report.cold+0xe/0x32 [ 92.727761][ T9859] ? __list_add_valid+0x9a/0xa0 [ 92.732592][ T9859] kasan_report+0x12/0x20 [ 92.736902][ T9859] __asan_report_load8_noabort+0x14/0x20 [ 92.742527][ T9859] __list_add_valid+0x9a/0xa0 [ 92.747196][ T9859] rdma_listen+0x6b7/0x970 [ 92.751594][ T9859] ? _raw_spin_unlock+0x28/0x40 [ 92.756425][ T9859] ucma_listen+0x14d/0x1c0 [ 92.760823][ T9859] ? ucma_notify+0x190/0x190 [ 92.765414][ T9859] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 92.771642][ T9859] ? _copy_from_user+0x12c/0x1a0 [ 92.776614][ T9859] ucma_write+0x2d7/0x3c0 [ 92.780949][ T9859] ? ucma_notify+0x190/0x190 [ 92.785529][ T9859] ? ucma_open+0x290/0x290 [ 92.789971][ T9859] ? apparmor_file_permission+0x27/0x30 [ 92.795586][ T9859] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 92.801825][ T9859] ? security_file_permission+0x8f/0x380 [ 92.807878][ T9859] __vfs_write+0x8a/0x110 [ 92.812190][ T9859] ? ucma_open+0x290/0x290 [ 92.816596][ T9859] vfs_write+0x268/0x5d0 [ 92.820838][ T9859] ksys_write+0x220/0x290 [ 92.825167][ T9859] ? __ia32_sys_read+0xb0/0xb0 [ 92.829911][ T9859] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 92.835349][ T9859] ? do_fast_syscall_32+0xd1/0xe16 [ 92.840448][ T9859] ? entry_SYSENTER_compat+0x70/0x7f [ 92.845726][ T9859] ? do_fast_syscall_32+0xd1/0xe16 [ 92.850847][ T9859] __ia32_sys_write+0x71/0xb0 [ 92.855527][ T9859] do_fast_syscall_32+0x27b/0xe16 [ 92.860904][ T9859] entry_SYSENTER_compat+0x70/0x7f [ 92.865996][ T9859] RIP: 0023:0xf7f9de39 [ 92.870046][ T9859] Code: 1d 00 00 00 89 d3 5b 5e 5d c3 8b 04 24 c3 8b 1c 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 92.889633][ T9859] RSP: 002b:00000000f7f980cc EFLAGS: 00000296 ORIG_RAX: 0000000000000004 [ 92.898030][ T9859] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000040 [ 92.906040][ T9859] RDX: 0000000000000010 RSI: 0000000000000000 RDI: 0000000000000000 [ 92.914010][ T9859] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 92.921961][ T9859] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 92.929911][ T9859] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 92.939133][ T9859] Kernel Offset: disabled [ 92.943477][ T9859] Rebooting in 86400 seconds..