[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 72.036594][ T27] audit: type=1800 audit(1585103121.711:25): pid=9386 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 72.060830][ T27] audit: type=1800 audit(1585103121.721:26): pid=9386 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 72.109694][ T27] audit: type=1800 audit(1585103121.721:27): pid=9386 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 '10.128.0.104' (ECDSA) to the list of known hosts. 2020/03/25 02:25:32 parsed 1 programs 2020/03/25 02:25:33 executed programs: 0 syzkaller login: [ 84.264724][ T9557] IPVS: ftp: loaded support on port[0] = 21 [ 84.327438][ T9557] chnl_net:caif_netlink_parms(): no params data found [ 84.367733][ T9557] bridge0: port 1(bridge_slave_0) entered blocking state [ 84.375448][ T9557] bridge0: port 1(bridge_slave_0) entered disabled state [ 84.383386][ T9557] device bridge_slave_0 entered promiscuous mode [ 84.392351][ T9557] bridge0: port 2(bridge_slave_1) entered blocking state [ 84.399842][ T9557] bridge0: port 2(bridge_slave_1) entered disabled state [ 84.407751][ T9557] device bridge_slave_1 entered promiscuous mode [ 84.426162][ T9557] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 84.437229][ T9557] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 84.457572][ T9557] team0: Port device team_slave_0 added [ 84.464960][ T9557] team0: Port device team_slave_1 added [ 84.480367][ T9557] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 84.487383][ T9557] 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. [ 84.513485][ T9557] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 84.525813][ T9557] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 84.532965][ T9557] 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. [ 84.559294][ T9557] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 84.623094][ T9557] device hsr_slave_0 entered promiscuous mode [ 84.650887][ T9557] device hsr_slave_1 entered promiscuous mode [ 84.767672][ T9557] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 84.823345][ T9557] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 84.864167][ T9557] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 84.923645][ T9557] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 84.996367][ T9557] bridge0: port 2(bridge_slave_1) entered blocking state [ 85.003542][ T9557] bridge0: port 2(bridge_slave_1) entered forwarding state [ 85.011414][ T9557] bridge0: port 1(bridge_slave_0) entered blocking state [ 85.018896][ T9557] bridge0: port 1(bridge_slave_0) entered forwarding state [ 85.064194][ T9557] 8021q: adding VLAN 0 to HW filter on device bond0 [ 85.078019][ T3128] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 85.088506][ T3128] bridge0: port 1(bridge_slave_0) entered disabled state [ 85.096524][ T3128] bridge0: port 2(bridge_slave_1) entered disabled state [ 85.104664][ T3128] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 85.118246][ T9557] 8021q: adding VLAN 0 to HW filter on device team0 [ 85.128815][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 85.138324][ T5] bridge0: port 1(bridge_slave_0) entered blocking state [ 85.145995][ T5] bridge0: port 1(bridge_slave_0) entered forwarding state [ 85.160961][ T3126] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 85.169413][ T3126] bridge0: port 2(bridge_slave_1) entered blocking state [ 85.176557][ T3126] bridge0: port 2(bridge_slave_1) entered forwarding state [ 85.201521][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 85.209997][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 85.218873][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 85.227357][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 85.238200][ T9557] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 85.248202][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 85.265603][ T3126] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 85.273188][ T3126] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 85.286914][ T9557] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 85.306340][ T3126] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 85.326224][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 85.335516][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 85.345049][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 85.353002][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 85.362883][ T9557] device veth0_vlan entered promiscuous mode [ 85.374718][ T9557] device veth1_vlan entered promiscuous mode [ 85.396159][ T3126] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 85.404830][ T3126] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 85.413445][ T3126] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 85.422593][ T3126] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 85.433669][ T9557] device veth0_macvtap entered promiscuous mode [ 85.445257][ T9557] device veth1_macvtap entered promiscuous mode [ 85.462381][ T9557] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 85.470109][ T3126] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 85.480695][ T3126] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 85.488635][ T3126] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 85.497728][ T3126] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 85.509383][ T9557] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 85.517870][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 85.526428][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 86.216386][ T9625] ================================================================== [ 86.224719][ T9625] BUG: KASAN: use-after-free in __list_add_valid+0x93/0xa0 [ 86.232009][ T9625] Read of size 8 at addr ffff88809f8341e0 by task syz-executor.0/9625 [ 86.240395][ T9625] [ 86.242714][ T9625] CPU: 1 PID: 9625 Comm: syz-executor.0 Not tainted 5.6.0-rc7-syzkaller #0 [ 86.251639][ T9625] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 86.261714][ T9625] Call Trace: [ 86.265523][ T9625] dump_stack+0x188/0x20d [ 86.270109][ T9625] ? __list_add_valid+0x93/0xa0 [ 86.274961][ T9625] ? __list_add_valid+0x93/0xa0 [ 86.279813][ T9625] print_address_description.constprop.0.cold+0xd3/0x315 [ 86.286831][ T9625] ? __list_add_valid+0x93/0xa0 [ 86.291680][ T9625] ? __list_add_valid+0x93/0xa0 [ 86.296518][ T9625] __kasan_report.cold+0x1a/0x32 [ 86.301613][ T9625] ? __list_add_valid+0x93/0xa0 [ 86.306459][ T9625] kasan_report+0xe/0x20 [ 86.310685][ T9625] __list_add_valid+0x93/0xa0 [ 86.315405][ T9625] rdma_listen+0x681/0x910 [ 86.319815][ T9625] ucma_listen+0x14d/0x1c0 [ 86.324216][ T9625] ? ucma_notify+0x190/0x190 [ 86.328793][ T9625] ? __might_fault+0x190/0x1d0 [ 86.333537][ T9625] ? _copy_from_user+0x123/0x190 [ 86.338463][ T9625] ? ucma_notify+0x190/0x190 [ 86.343034][ T9625] ucma_write+0x285/0x350 [ 86.347428][ T9625] ? ucma_open+0x270/0x270 [ 86.352012][ T9625] ? security_file_permission+0x8a/0x370 [ 86.357626][ T9625] ? ucma_open+0x270/0x270 [ 86.362019][ T9625] __vfs_write+0x76/0x100 [ 86.366330][ T9625] vfs_write+0x262/0x5c0 [ 86.370559][ T9625] ksys_write+0x1e8/0x250 [ 86.374878][ T9625] ? __ia32_sys_read+0xb0/0xb0 [ 86.379630][ T9625] ? __ia32_sys_clock_settime+0x260/0x260 [ 86.385357][ T9625] ? trace_hardirqs_off_caller+0x55/0x230 [ 86.391753][ T9625] do_syscall_64+0xf6/0x7d0 [ 86.397216][ T9625] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 86.403091][ T9625] RIP: 0033:0x45c849 [ 86.406964][ T9625] 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 [ 86.426560][ T9625] RSP: 002b:00007f9f41947c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 86.434948][ T9625] RAX: ffffffffffffffda RBX: 00007f9f419486d4 RCX: 000000000045c849 [ 86.442917][ T9625] RDX: 0000000000000010 RSI: 0000000020000040 RDI: 0000000000000003 [ 86.450931][ T9625] RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 [ 86.458905][ T9625] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 86.466860][ T9625] R13: 0000000000000cc0 R14: 00000000004cee4e R15: 000000000076bf0c [ 86.474828][ T9625] [ 86.477137][ T9625] Allocated by task 9620: [ 86.481449][ T9625] save_stack+0x1b/0x80 [ 86.485595][ T9625] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 86.491289][ T9625] kmem_cache_alloc_trace+0x153/0x7d0 [ 86.496645][ T9625] __rdma_create_id+0x5b/0x850 [ 86.501402][ T9625] ucma_create_id+0x1cb/0x580 [ 86.506062][ T9625] ucma_write+0x285/0x350 [ 86.510366][ T9625] __vfs_write+0x76/0x100 [ 86.514678][ T9625] vfs_write+0x262/0x5c0 [ 86.518894][ T9625] ksys_write+0x1e8/0x250 [ 86.523214][ T9625] do_syscall_64+0xf6/0x7d0 [ 86.528003][ T9625] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 86.533887][ T9625] [ 86.536197][ T9625] Freed by task 9620: [ 86.540174][ T9625] save_stack+0x1b/0x80 [ 86.544340][ T9625] __kasan_slab_free+0xf7/0x140 [ 86.549185][ T9625] kfree+0x109/0x2b0 [ 86.553074][ T9625] ucma_close+0x10b/0x300 [ 86.557482][ T9625] __fput+0x2da/0x850 [ 86.561565][ T9625] task_work_run+0x13f/0x1b0 [ 86.566149][ T9625] exit_to_usermode_loop+0x2fa/0x360 [ 86.571422][ T9625] do_syscall_64+0x6b1/0x7d0 [ 86.575994][ T9625] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 86.581862][ T9625] [ 86.584191][ T9625] The buggy address belongs to the object at ffff88809f834000 [ 86.584191][ T9625] which belongs to the cache kmalloc-2k of size 2048 [ 86.598228][ T9625] The buggy address is located 480 bytes inside of [ 86.598228][ T9625] 2048-byte region [ffff88809f834000, ffff88809f834800) [ 86.611575][ T9625] The buggy address belongs to the page: [ 86.617193][ T9625] page:ffffea00027e0d00 refcount:1 mapcount:0 mapping:ffff8880aa000e00 index:0x0 [ 86.626272][ T9625] flags: 0xfffe0000000200(slab) [ 86.631102][ T9625] raw: 00fffe0000000200 ffffea00027d4708 ffffea00027b1f08 ffff8880aa000e00 [ 86.639660][ T9625] raw: 0000000000000000 ffff88809f834000 0000000100000001 0000000000000000 [ 86.648226][ T9625] page dumped because: kasan: bad access detected [ 86.654724][ T9625] [ 86.657037][ T9625] Memory state around the buggy address: [ 86.662644][ T9625] ffff88809f834080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 86.670691][ T9625] ffff88809f834100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 86.678729][ T9625] >ffff88809f834180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 86.686762][ T9625] ^ [ 86.693930][ T9625] ffff88809f834200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 86.701988][ T9625] ffff88809f834280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 86.710037][ T9625] ================================================================== [ 86.718075][ T9625] Disabling lock debugging due to kernel taint [ 86.729699][ T9625] Kernel panic - not syncing: panic_on_warn set ... [ 86.736323][ T9625] CPU: 1 PID: 9625 Comm: syz-executor.0 Tainted: G B 5.6.0-rc7-syzkaller #0 [ 86.746292][ T9625] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 86.756330][ T9625] Call Trace: [ 86.759613][ T9625] dump_stack+0x188/0x20d [ 86.763934][ T9625] panic+0x2e3/0x75c [ 86.767812][ T9625] ? add_taint.cold+0x16/0x16 [ 86.772472][ T9625] ? preempt_schedule_common+0x5e/0xc0 [ 86.777916][ T9625] ? __list_add_valid+0x93/0xa0 [ 86.782745][ T9625] ? ___preempt_schedule+0x16/0x18 [ 86.787833][ T9625] ? trace_hardirqs_on+0x55/0x220 [ 86.792836][ T9625] ? __list_add_valid+0x93/0xa0 [ 86.797668][ T9625] end_report+0x43/0x49 [ 86.801800][ T9625] ? __list_add_valid+0x93/0xa0 [ 86.806639][ T9625] __kasan_report.cold+0xd/0x32 [ 86.811470][ T9625] ? __list_add_valid+0x93/0xa0 [ 86.816296][ T9625] kasan_report+0xe/0x20 [ 86.820522][ T9625] __list_add_valid+0x93/0xa0 [ 86.825208][ T9625] rdma_listen+0x681/0x910 [ 86.829617][ T9625] ucma_listen+0x14d/0x1c0 [ 86.834072][ T9625] ? ucma_notify+0x190/0x190 [ 86.839261][ T9625] ? __might_fault+0x190/0x1d0 [ 86.844015][ T9625] ? _copy_from_user+0x123/0x190 [ 86.848931][ T9625] ? ucma_notify+0x190/0x190 [ 86.856060][ T9625] ucma_write+0x285/0x350 [ 86.860387][ T9625] ? ucma_open+0x270/0x270 [ 86.864795][ T9625] ? security_file_permission+0x8a/0x370 [ 86.870571][ T9625] ? ucma_open+0x270/0x270 [ 86.874970][ T9625] __vfs_write+0x76/0x100 [ 86.879289][ T9625] vfs_write+0x262/0x5c0 [ 86.883515][ T9625] ksys_write+0x1e8/0x250 [ 86.887837][ T9625] ? __ia32_sys_read+0xb0/0xb0 [ 86.892585][ T9625] ? __ia32_sys_clock_settime+0x260/0x260 [ 86.898285][ T9625] ? trace_hardirqs_off_caller+0x55/0x230 [ 86.903985][ T9625] do_syscall_64+0xf6/0x7d0 [ 86.908474][ T9625] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 86.915563][ T9625] RIP: 0033:0x45c849 [ 86.919434][ T9625] 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 [ 86.939102][ T9625] RSP: 002b:00007f9f41947c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 86.947502][ T9625] RAX: ffffffffffffffda RBX: 00007f9f419486d4 RCX: 000000000045c849 [ 86.955473][ T9625] RDX: 0000000000000010 RSI: 0000000020000040 RDI: 0000000000000003 [ 86.963433][ T9625] RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 [ 86.971394][ T9625] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 86.980240][ T9625] R13: 0000000000000cc0 R14: 00000000004cee4e R15: 000000000076bf0c [ 86.989782][ T9625] Kernel Offset: disabled [ 86.994102][ T9625] Rebooting in 86400 seconds..