[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 70.559885][ T27] audit: type=1800 audit(1583755898.762:25): pid=9265 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 70.593202][ T27] audit: type=1800 audit(1583755898.762:26): pid=9265 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 70.630857][ T27] audit: type=1800 audit(1583755898.762:27): pid=9265 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 '10.128.0.197' (ECDSA) to the list of known hosts. 2020/03/09 12:11:49 parsed 1 programs 2020/03/09 12:11:50 executed programs: 0 syzkaller login: [ 82.547420][ T9437] IPVS: ftp: loaded support on port[0] = 21 [ 82.610612][ T9437] chnl_net:caif_netlink_parms(): no params data found [ 82.663553][ T9437] bridge0: port 1(bridge_slave_0) entered blocking state [ 82.671817][ T9437] bridge0: port 1(bridge_slave_0) entered disabled state [ 82.680070][ T9437] device bridge_slave_0 entered promiscuous mode [ 82.688696][ T9437] bridge0: port 2(bridge_slave_1) entered blocking state [ 82.696225][ T9437] bridge0: port 2(bridge_slave_1) entered disabled state [ 82.704316][ T9437] device bridge_slave_1 entered promiscuous mode [ 82.722457][ T9437] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 82.733830][ T9437] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 82.754832][ T9437] team0: Port device team_slave_0 added [ 82.762944][ T9437] team0: Port device team_slave_1 added [ 82.778800][ T9437] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 82.786017][ T9437] 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. [ 82.812251][ T9437] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 82.825304][ T9437] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 82.832254][ T9437] 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. [ 82.858578][ T9437] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 82.915495][ T9437] device hsr_slave_0 entered promiscuous mode [ 82.953464][ T9437] device hsr_slave_1 entered promiscuous mode [ 83.074298][ T9437] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 83.126177][ T9437] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 83.185896][ T9437] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 83.225623][ T9437] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 83.289991][ T9437] bridge0: port 2(bridge_slave_1) entered blocking state [ 83.297393][ T9437] bridge0: port 2(bridge_slave_1) entered forwarding state [ 83.305288][ T9437] bridge0: port 1(bridge_slave_0) entered blocking state [ 83.312354][ T9437] bridge0: port 1(bridge_slave_0) entered forwarding state [ 83.358979][ T9437] 8021q: adding VLAN 0 to HW filter on device bond0 [ 83.372797][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 83.383177][ T12] bridge0: port 1(bridge_slave_0) entered disabled state [ 83.392538][ T12] bridge0: port 2(bridge_slave_1) entered disabled state [ 83.401451][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 83.415620][ T9437] 8021q: adding VLAN 0 to HW filter on device team0 [ 83.426888][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 83.436532][ T12] bridge0: port 1(bridge_slave_0) entered blocking state [ 83.443837][ T12] bridge0: port 1(bridge_slave_0) entered forwarding state [ 83.455171][ T2716] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 83.464855][ T2716] bridge0: port 2(bridge_slave_1) entered blocking state [ 83.471906][ T2716] bridge0: port 2(bridge_slave_1) entered forwarding state [ 83.495094][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 83.504655][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 83.516806][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 83.524856][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 83.536495][ T2684] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 83.548878][ T9437] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 83.569193][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 83.577253][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 83.590748][ T9437] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 83.610176][ T2684] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 83.619795][ T2684] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 83.642948][ T9437] device veth0_vlan entered promiscuous mode [ 83.650379][ T2684] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 83.659661][ T2684] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 83.668840][ T2684] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 83.677061][ T2684] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 83.691072][ T9437] device veth1_vlan entered promiscuous mode [ 83.711563][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 83.720365][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 83.728967][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 83.737570][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 83.748321][ T9437] device veth0_macvtap entered promiscuous mode [ 83.761828][ T9437] device veth1_macvtap entered promiscuous mode [ 83.779891][ T9437] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 83.788297][ T2684] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 83.796572][ T2684] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 83.804711][ T2684] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 83.813633][ T2684] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 83.825805][ T9437] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 83.833328][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 83.841801][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 84.149752][ T9453] ================================================================== [ 84.158232][ T9453] BUG: KASAN: use-after-free in __list_add_valid+0x93/0xa0 [ 84.165489][ T9453] Read of size 8 at addr ffff88809198a1e0 by task syz-executor.0/9453 [ 84.173632][ T9453] [ 84.175950][ T9453] CPU: 0 PID: 9453 Comm: syz-executor.0 Not tainted 5.6.0-rc3-next-20200228-syzkaller #0 [ 84.185728][ T9453] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 84.195817][ T9453] Call Trace: [ 84.199100][ T9453] dump_stack+0x188/0x20d [ 84.203589][ T9453] ? __list_add_valid+0x93/0xa0 [ 84.208422][ T9453] ? __list_add_valid+0x93/0xa0 [ 84.213257][ T9453] print_address_description.constprop.0.cold+0xd3/0x315 [ 84.220363][ T9453] ? __list_add_valid+0x93/0xa0 [ 84.225198][ T9453] ? __list_add_valid+0x93/0xa0 [ 84.230072][ T9453] __kasan_report.cold+0x1a/0x32 [ 84.234993][ T9453] ? __list_add_valid+0x93/0xa0 [ 84.239949][ T9453] kasan_report+0xe/0x20 [ 84.244182][ T9453] __list_add_valid+0x93/0xa0 [ 84.248844][ T9453] rdma_listen+0x681/0x910 [ 84.253388][ T9453] ucma_listen+0x14d/0x1c0 [ 84.258207][ T9453] ? ucma_notify+0x190/0x190 [ 84.262798][ T9453] ? __might_fault+0x190/0x1d0 [ 84.267547][ T9453] ? _copy_from_user+0x123/0x190 [ 84.272469][ T9453] ? ucma_notify+0x190/0x190 [ 84.277053][ T9453] ucma_write+0x285/0x350 [ 84.281416][ T9453] ? ucma_open+0x270/0x270 [ 84.285834][ T9453] ? security_file_permission+0x8a/0x370 [ 84.291460][ T9453] ? ucma_open+0x270/0x270 [ 84.295867][ T9453] __vfs_write+0x76/0x100 [ 84.300183][ T9453] vfs_write+0x262/0x5c0 [ 84.304417][ T9453] ksys_write+0x1e8/0x250 [ 84.308725][ T9453] ? __ia32_sys_read+0xb0/0xb0 [ 84.313478][ T9453] ? __ia32_sys_clock_settime+0x260/0x260 [ 84.319217][ T9453] ? trace_hardirqs_off_caller+0x55/0x230 [ 84.324954][ T9453] do_syscall_64+0xf6/0x790 [ 84.329449][ T9453] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 84.335325][ T9453] RIP: 0033:0x45c4a9 [ 84.339216][ T9453] 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 [ 84.358815][ T9453] RSP: 002b:00007f516b4e9c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 84.369726][ T9453] RAX: ffffffffffffffda RBX: 00007f516b4ea6d4 RCX: 000000000045c4a9 [ 84.377681][ T9453] RDX: 0000000000000010 RSI: 0000000020000140 RDI: 0000000000000003 [ 84.385634][ T9453] RBP: 000000000076bfc0 R08: 0000000000000000 R09: 0000000000000000 [ 84.393588][ T9453] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 84.401544][ T9453] R13: 0000000000000cbe R14: 00000000004cea80 R15: 000000000076bfcc [ 84.409513][ T9453] [ 84.411907][ T9453] Allocated by task 9447: [ 84.416238][ T9453] save_stack+0x1b/0x40 [ 84.420381][ T9453] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 84.426014][ T9453] kmem_cache_alloc_trace+0x153/0x7d0 [ 84.431385][ T9453] __rdma_create_id+0x5b/0x850 [ 84.436131][ T9453] ucma_create_id+0x1cb/0x580 [ 84.440787][ T9453] ucma_write+0x285/0x350 [ 84.445109][ T9453] __vfs_write+0x76/0x100 [ 84.449797][ T9453] vfs_write+0x262/0x5c0 [ 84.454161][ T9453] ksys_write+0x1e8/0x250 [ 84.459970][ T9453] do_syscall_64+0xf6/0x790 [ 84.464741][ T9453] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 84.470714][ T9453] [ 84.473025][ T9453] Freed by task 9444: [ 84.477024][ T9453] save_stack+0x1b/0x40 [ 84.481467][ T9453] __kasan_slab_free+0xf7/0x140 [ 84.486320][ T9453] kfree+0x109/0x2b0 [ 84.490298][ T9453] ucma_close+0x10b/0x300 [ 84.494739][ T9453] __fput+0x2da/0x850 [ 84.498711][ T9453] task_work_run+0x13f/0x1b0 [ 84.503293][ T9453] exit_to_usermode_loop+0x2fa/0x360 [ 84.508578][ T9453] do_syscall_64+0x672/0x790 [ 84.513597][ T9453] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 84.519472][ T9453] [ 84.521812][ T9453] The buggy address belongs to the object at ffff88809198a000 [ 84.521812][ T9453] which belongs to the cache kmalloc-2k of size 2048 [ 84.536184][ T9453] The buggy address is located 480 bytes inside of [ 84.536184][ T9453] 2048-byte region [ffff88809198a000, ffff88809198a800) [ 84.550488][ T9453] The buggy address belongs to the page: [ 84.556311][ T9453] page:ffffea0002466280 refcount:1 mapcount:0 mapping:000000005ad81a64 index:0x0 [ 84.565398][ T9453] flags: 0xfffe0000000200(slab) [ 84.570449][ T9453] raw: 00fffe0000000200 ffffea0002486508 ffffea00023d0fc8 ffff8880aa000e00 [ 84.579741][ T9453] raw: 0000000000000000 ffff88809198a000 0000000100000001 0000000000000000 [ 84.588327][ T9453] page dumped because: kasan: bad access detected [ 84.594714][ T9453] [ 84.597021][ T9453] Memory state around the buggy address: [ 84.602669][ T9453] ffff88809198a080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 84.610713][ T9453] ffff88809198a100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 84.618756][ T9453] >ffff88809198a180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 84.626796][ T9453] ^ [ 84.633979][ T9453] ffff88809198a200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 84.642195][ T9453] ffff88809198a280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 84.650450][ T9453] ================================================================== [ 84.658505][ T9453] Disabling lock debugging due to kernel taint [ 84.668611][ T9453] Kernel panic - not syncing: panic_on_warn set ... [ 84.675221][ T9453] CPU: 0 PID: 9453 Comm: syz-executor.0 Tainted: G B 5.6.0-rc3-next-20200228-syzkaller #0 [ 84.686419][ T9453] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 84.696468][ T9453] Call Trace: [ 84.699748][ T9453] dump_stack+0x188/0x20d [ 84.704130][ T9453] panic+0x2e3/0x75c [ 84.708026][ T9453] ? add_taint.cold+0x16/0x16 [ 84.712821][ T9453] ? preempt_schedule_common+0x5e/0xc0 [ 84.718435][ T9453] ? __list_add_valid+0x93/0xa0 [ 84.723279][ T9453] ? ___preempt_schedule+0x16/0x18 [ 84.728399][ T9453] ? trace_hardirqs_on+0x55/0x220 [ 84.733450][ T9453] ? __list_add_valid+0x93/0xa0 [ 84.738280][ T9453] end_report+0x43/0x49 [ 84.742417][ T9453] ? __list_add_valid+0x93/0xa0 [ 84.747407][ T9453] __kasan_report.cold+0xd/0x32 [ 84.752256][ T9453] ? __list_add_valid+0x93/0xa0 [ 84.757203][ T9453] kasan_report+0xe/0x20 [ 84.761446][ T9453] __list_add_valid+0x93/0xa0 [ 84.766118][ T9453] rdma_listen+0x681/0x910 [ 84.770518][ T9453] ucma_listen+0x14d/0x1c0 [ 84.774915][ T9453] ? ucma_notify+0x190/0x190 [ 84.779512][ T9453] ? __might_fault+0x190/0x1d0 [ 84.784690][ T9453] ? _copy_from_user+0x123/0x190 [ 84.789621][ T9453] ? ucma_notify+0x190/0x190 [ 84.794201][ T9453] ucma_write+0x285/0x350 [ 84.798537][ T9453] ? ucma_open+0x270/0x270 [ 84.803293][ T9453] ? security_file_permission+0x8a/0x370 [ 84.808992][ T9453] ? ucma_open+0x270/0x270 [ 84.813388][ T9453] __vfs_write+0x76/0x100 [ 84.817713][ T9453] vfs_write+0x262/0x5c0 [ 84.822098][ T9453] ksys_write+0x1e8/0x250 [ 84.826425][ T9453] ? __ia32_sys_read+0xb0/0xb0 [ 84.831190][ T9453] ? __ia32_sys_clock_settime+0x260/0x260 [ 84.836903][ T9453] ? trace_hardirqs_off_caller+0x55/0x230 [ 84.842708][ T9453] do_syscall_64+0xf6/0x790 [ 84.847212][ T9453] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 84.853098][ T9453] RIP: 0033:0x45c4a9 [ 84.857008][ T9453] 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 [ 84.876829][ T9453] RSP: 002b:00007f516b4e9c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 84.885242][ T9453] RAX: ffffffffffffffda RBX: 00007f516b4ea6d4 RCX: 000000000045c4a9 [ 84.893212][ T9453] RDX: 0000000000000010 RSI: 0000000020000140 RDI: 0000000000000003 [ 84.901166][ T9453] RBP: 000000000076bfc0 R08: 0000000000000000 R09: 0000000000000000 [ 84.909257][ T9453] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 84.917833][ T9453] R13: 0000000000000cbe R14: 00000000004cea80 R15: 000000000076bfcc [ 84.927125][ T9453] Kernel Offset: disabled [ 84.931568][ T9453] Rebooting in 86400 seconds..