[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 71.781068][ T26] audit: type=1800 audit(1584538541.140:25): pid=9296 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 71.802325][ T26] audit: type=1800 audit(1584538541.140:26): pid=9296 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 71.859312][ T26] audit: type=1800 audit(1584538541.140:27): pid=9296 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 '10.128.1.26' (ECDSA) to the list of known hosts. 2020/03/18 13:35:51 parsed 1 programs 2020/03/18 13:35:53 executed programs: 0 syzkaller login: [ 84.015268][ T9467] IPVS: ftp: loaded support on port[0] = 21 [ 84.076190][ T9467] chnl_net:caif_netlink_parms(): no params data found [ 84.116546][ T9467] bridge0: port 1(bridge_slave_0) entered blocking state [ 84.124031][ T9467] bridge0: port 1(bridge_slave_0) entered disabled state [ 84.132064][ T9467] device bridge_slave_0 entered promiscuous mode [ 84.140239][ T9467] bridge0: port 2(bridge_slave_1) entered blocking state [ 84.148091][ T9467] bridge0: port 2(bridge_slave_1) entered disabled state [ 84.155901][ T9467] device bridge_slave_1 entered promiscuous mode [ 84.173681][ T9467] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 84.184448][ T9467] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 84.204100][ T9467] team0: Port device team_slave_0 added [ 84.211303][ T9467] team0: Port device team_slave_1 added [ 84.226293][ T9467] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 84.234139][ T9467] 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. [ 84.260045][ T9467] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 84.274070][ T9467] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 84.281123][ T9467] 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. [ 84.307154][ T9467] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 84.353787][ T9467] device hsr_slave_0 entered promiscuous mode [ 84.391697][ T9467] device hsr_slave_1 entered promiscuous mode [ 84.540531][ T9467] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 84.595008][ T9467] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 84.643645][ T9467] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 84.683598][ T9467] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 84.746865][ T9467] bridge0: port 2(bridge_slave_1) entered blocking state [ 84.754055][ T9467] bridge0: port 2(bridge_slave_1) entered forwarding state [ 84.761775][ T9467] bridge0: port 1(bridge_slave_0) entered blocking state [ 84.768830][ T9467] bridge0: port 1(bridge_slave_0) entered forwarding state [ 84.814718][ T9467] 8021q: adding VLAN 0 to HW filter on device bond0 [ 84.827158][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 84.837508][ T5] bridge0: port 1(bridge_slave_0) entered disabled state [ 84.845625][ T5] bridge0: port 2(bridge_slave_1) entered disabled state [ 84.853801][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 84.866154][ T9467] 8021q: adding VLAN 0 to HW filter on device team0 [ 84.877804][ T2825] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 84.886764][ T2825] bridge0: port 1(bridge_slave_0) entered blocking state [ 84.893840][ T2825] bridge0: port 1(bridge_slave_0) entered forwarding state [ 84.912515][ T2825] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 84.921089][ T2825] bridge0: port 2(bridge_slave_1) entered blocking state [ 84.928186][ T2825] bridge0: port 2(bridge_slave_1) entered forwarding state [ 84.940886][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 84.950210][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 84.963649][ T2825] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 84.975770][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 84.989490][ T9467] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 85.001260][ T9467] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 85.010538][ T2844] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 85.031626][ T2844] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 85.039054][ T2844] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 85.049137][ T9467] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 85.068530][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 85.087122][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 85.096882][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 85.108182][ T9467] device veth0_vlan entered promiscuous mode [ 85.115198][ T2718] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 85.123247][ T2718] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 85.136852][ T9467] device veth1_vlan entered promiscuous mode [ 85.157140][ T2844] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 85.165437][ T2844] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 85.173490][ T2844] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 85.181956][ T2844] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 85.194133][ T9467] device veth0_macvtap entered promiscuous mode [ 85.204768][ T9467] device veth1_macvtap entered promiscuous mode [ 85.221314][ T9467] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 85.228730][ T2718] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 85.236816][ T2718] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 85.244745][ T2718] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 85.253509][ T2718] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 85.265914][ T9467] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 85.273379][ T2844] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 85.282439][ T2844] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 85.929055][ T9533] ================================================================== [ 85.937309][ T9533] BUG: KASAN: use-after-free in __list_add_valid+0x93/0xa0 [ 85.944486][ T9533] Read of size 8 at addr ffff8880a72b11e0 by task syz-executor.0/9533 [ 85.952610][ T9533] [ 85.954922][ T9533] CPU: 1 PID: 9533 Comm: syz-executor.0 Not tainted 5.6.0-rc6-syzkaller #0 [ 85.963489][ T9533] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 85.973538][ T9533] Call Trace: [ 85.976824][ T9533] dump_stack+0x188/0x20d [ 85.981139][ T9533] ? __list_add_valid+0x93/0xa0 [ 85.985966][ T9533] ? __list_add_valid+0x93/0xa0 [ 85.990797][ T9533] print_address_description.constprop.0.cold+0xd3/0x315 [ 85.997796][ T9533] ? __list_add_valid+0x93/0xa0 [ 86.002633][ T9533] ? __list_add_valid+0x93/0xa0 [ 86.007461][ T9533] __kasan_report.cold+0x1a/0x32 [ 86.012380][ T9533] ? __list_add_valid+0x93/0xa0 [ 86.017212][ T9533] kasan_report+0xe/0x20 [ 86.021439][ T9533] __list_add_valid+0x93/0xa0 [ 86.026145][ T9533] rdma_listen+0x681/0x910 [ 86.030541][ T9533] ucma_listen+0x14d/0x1c0 [ 86.034985][ T9533] ? ucma_notify+0x190/0x190 [ 86.039565][ T9533] ? __might_fault+0x190/0x1d0 [ 86.044326][ T9533] ? _copy_from_user+0x123/0x190 [ 86.049287][ T9533] ? ucma_notify+0x190/0x190 [ 86.053858][ T9533] ucma_write+0x285/0x350 [ 86.058174][ T9533] ? ucma_open+0x270/0x270 [ 86.062600][ T9533] ? security_file_permission+0x8a/0x370 [ 86.068264][ T9533] ? ucma_open+0x270/0x270 [ 86.072662][ T9533] __vfs_write+0x76/0x100 [ 86.076975][ T9533] vfs_write+0x262/0x5c0 [ 86.081200][ T9533] ksys_write+0x1e8/0x250 [ 86.085945][ T9533] ? __ia32_sys_read+0xb0/0xb0 [ 86.090686][ T9533] ? __ia32_sys_clock_settime+0x260/0x260 [ 86.096387][ T9533] ? trace_hardirqs_off_caller+0x55/0x230 [ 86.102113][ T9533] do_syscall_64+0xf6/0x7d0 [ 86.106617][ T9533] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 86.112486][ T9533] RIP: 0033:0x45c849 [ 86.116391][ T9533] 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 [ 86.135982][ T9533] RSP: 002b:00007fcc87135c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 86.144382][ T9533] RAX: ffffffffffffffda RBX: 00007fcc871366d4 RCX: 000000000045c849 [ 86.152331][ T9533] RDX: 0000000000000010 RSI: 00000000200001c0 RDI: 0000000000000003 [ 86.160332][ T9533] RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 [ 86.168283][ T9533] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 86.176233][ T9533] R13: 0000000000000cc0 R14: 00000000004cee66 R15: 000000000076bf0c [ 86.184199][ T9533] [ 86.186507][ T9533] Allocated by task 9530: [ 86.190824][ T9533] save_stack+0x1b/0x80 [ 86.194979][ T9533] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 86.200600][ T9533] kmem_cache_alloc_trace+0x153/0x7d0 [ 86.205963][ T9533] __rdma_create_id+0x5b/0x850 [ 86.210758][ T9533] ucma_create_id+0x1cb/0x580 [ 86.215413][ T9533] ucma_write+0x285/0x350 [ 86.219747][ T9533] __vfs_write+0x76/0x100 [ 86.224054][ T9533] vfs_write+0x262/0x5c0 [ 86.228309][ T9533] ksys_write+0x1e8/0x250 [ 86.232637][ T9533] do_syscall_64+0xf6/0x7d0 [ 86.237384][ T9533] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 86.243249][ T9533] [ 86.245556][ T9533] Freed by task 9528: [ 86.249522][ T9533] save_stack+0x1b/0x80 [ 86.253690][ T9533] __kasan_slab_free+0xf7/0x140 [ 86.258514][ T9533] kfree+0x109/0x2b0 [ 86.262387][ T9533] ucma_close+0x10b/0x300 [ 86.266697][ T9533] __fput+0x2da/0x850 [ 86.270668][ T9533] task_work_run+0x13f/0x1b0 [ 86.275239][ T9533] exit_to_usermode_loop+0x2fa/0x360 [ 86.280502][ T9533] do_syscall_64+0x6b1/0x7d0 [ 86.285087][ T9533] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 86.290959][ T9533] [ 86.293266][ T9533] The buggy address belongs to the object at ffff8880a72b1000 [ 86.293266][ T9533] which belongs to the cache kmalloc-2k of size 2048 [ 86.307294][ T9533] The buggy address is located 480 bytes inside of [ 86.307294][ T9533] 2048-byte region [ffff8880a72b1000, ffff8880a72b1800) [ 86.321413][ T9533] The buggy address belongs to the page: [ 86.327052][ T9533] page:ffffea00029cac40 refcount:1 mapcount:0 mapping:ffff8880aa000e00 index:0x0 [ 86.336134][ T9533] flags: 0xfffe0000000200(slab) [ 86.340972][ T9533] raw: 00fffe0000000200 ffffea00024c5888 ffffea000268ac48 ffff8880aa000e00 [ 86.349545][ T9533] raw: 0000000000000000 ffff8880a72b1000 0000000100000001 0000000000000000 [ 86.358102][ T9533] page dumped because: kasan: bad access detected [ 86.364496][ T9533] [ 86.366812][ T9533] Memory state around the buggy address: [ 86.372439][ T9533] ffff8880a72b1080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 86.380475][ T9533] ffff8880a72b1100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 86.388513][ T9533] >ffff8880a72b1180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 86.396590][ T9533] ^ [ 86.403772][ T9533] ffff8880a72b1200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 86.411864][ T9533] ffff8880a72b1280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 86.419904][ T9533] ================================================================== [ 86.427939][ T9533] Disabling lock debugging due to kernel taint [ 86.439911][ T9533] Kernel panic - not syncing: panic_on_warn set ... [ 86.446497][ T9533] CPU: 1 PID: 9533 Comm: syz-executor.0 Tainted: G B 5.6.0-rc6-syzkaller #0 [ 86.456617][ T9533] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 86.466648][ T9533] Call Trace: [ 86.469921][ T9533] dump_stack+0x188/0x20d [ 86.474231][ T9533] panic+0x2e3/0x75c [ 86.478111][ T9533] ? add_taint.cold+0x16/0x16 [ 86.482774][ T9533] ? preempt_schedule_common+0x5e/0xc0 [ 86.488220][ T9533] ? __list_add_valid+0x93/0xa0 [ 86.493053][ T9533] ? ___preempt_schedule+0x16/0x18 [ 86.498141][ T9533] ? trace_hardirqs_on+0x55/0x220 [ 86.503141][ T9533] ? __list_add_valid+0x93/0xa0 [ 86.507970][ T9533] end_report+0x43/0x49 [ 86.512102][ T9533] ? __list_add_valid+0x93/0xa0 [ 86.516927][ T9533] __kasan_report.cold+0xd/0x32 [ 86.521866][ T9533] ? __list_add_valid+0x93/0xa0 [ 86.526712][ T9533] kasan_report+0xe/0x20 [ 86.530934][ T9533] __list_add_valid+0x93/0xa0 [ 86.535600][ T9533] rdma_listen+0x681/0x910 [ 86.540008][ T9533] ucma_listen+0x14d/0x1c0 [ 86.544411][ T9533] ? ucma_notify+0x190/0x190 [ 86.548984][ T9533] ? __might_fault+0x190/0x1d0 [ 86.553730][ T9533] ? _copy_from_user+0x123/0x190 [ 86.558647][ T9533] ? ucma_notify+0x190/0x190 [ 86.563215][ T9533] ucma_write+0x285/0x350 [ 86.567522][ T9533] ? ucma_open+0x270/0x270 [ 86.571918][ T9533] ? security_file_permission+0x8a/0x370 [ 86.577529][ T9533] ? ucma_open+0x270/0x270 [ 86.581923][ T9533] __vfs_write+0x76/0x100 [ 86.586231][ T9533] vfs_write+0x262/0x5c0 [ 86.590452][ T9533] ksys_write+0x1e8/0x250 [ 86.594762][ T9533] ? __ia32_sys_read+0xb0/0xb0 [ 86.599502][ T9533] ? __ia32_sys_clock_settime+0x260/0x260 [ 86.605206][ T9533] ? trace_hardirqs_off_caller+0x55/0x230 [ 86.610911][ T9533] do_syscall_64+0xf6/0x7d0 [ 86.615402][ T9533] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 86.621277][ T9533] RIP: 0033:0x45c849 [ 86.625164][ T9533] 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 [ 86.645440][ T9533] RSP: 002b:00007fcc87135c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 86.653825][ T9533] RAX: ffffffffffffffda RBX: 00007fcc871366d4 RCX: 000000000045c849 [ 86.661777][ T9533] RDX: 0000000000000010 RSI: 00000000200001c0 RDI: 0000000000000003 [ 86.669730][ T9533] RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 [ 86.677688][ T9533] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 86.685640][ T9533] R13: 0000000000000cc0 R14: 00000000004cee66 R15: 000000000076bf0c [ 86.694718][ T9533] Kernel Offset: disabled [ 86.699040][ T9533] Rebooting in 86400 seconds..