[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 68.825006][ T27] audit: type=1800 audit(1578382108.905:25): pid=9174 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 68.845611][ T27] audit: type=1800 audit(1578382108.915:26): pid=9174 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 68.896905][ T27] audit: type=1800 audit(1578382108.915:27): pid=9174 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 '10.128.0.88' (ECDSA) to the list of known hosts. syzkaller login: [ 76.983415][ T9328] IPVS: ftp: loaded support on port[0] = 21 [ 77.042940][ T9328] chnl_net:caif_netlink_parms(): no params data found [ 77.073328][ T9328] bridge0: port 1(bridge_slave_0) entered blocking state [ 77.080916][ T9328] bridge0: port 1(bridge_slave_0) entered disabled state [ 77.089323][ T9328] device bridge_slave_0 entered promiscuous mode [ 77.098201][ T9328] bridge0: port 2(bridge_slave_1) entered blocking state [ 77.105270][ T9328] bridge0: port 2(bridge_slave_1) entered disabled state [ 77.113775][ T9328] device bridge_slave_1 entered promiscuous mode [ 77.132248][ T9328] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 77.143550][ T9328] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 77.163486][ T9328] team0: Port device team_slave_0 added [ 77.171542][ T9328] team0: Port device team_slave_1 added [ 77.229980][ T9328] device hsr_slave_0 entered promiscuous mode [ 77.297099][ T9328] device hsr_slave_1 entered promiscuous mode [ 77.429385][ T9328] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 77.490202][ T9328] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 77.539817][ T9328] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 77.579591][ T9328] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 77.638096][ T9328] bridge0: port 2(bridge_slave_1) entered blocking state [ 77.645219][ T9328] bridge0: port 2(bridge_slave_1) entered forwarding state [ 77.652998][ T9328] bridge0: port 1(bridge_slave_0) entered blocking state [ 77.660086][ T9328] bridge0: port 1(bridge_slave_0) entered forwarding state [ 77.701249][ T9328] 8021q: adding VLAN 0 to HW filter on device bond0 [ 77.714283][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 77.735145][ T17] bridge0: port 1(bridge_slave_0) entered disabled state [ 77.754122][ T17] bridge0: port 2(bridge_slave_1) entered disabled state [ 77.762111][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 77.774339][ T9328] 8021q: adding VLAN 0 to HW filter on device team0 [ 77.784438][ T3443] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 77.793508][ T3443] bridge0: port 1(bridge_slave_0) entered blocking state [ 77.800668][ T3443] bridge0: port 1(bridge_slave_0) entered forwarding state [ 77.811972][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 77.820799][ T17] bridge0: port 2(bridge_slave_1) entered blocking state [ 77.827892][ T17] bridge0: port 2(bridge_slave_1) entered forwarding state [ 77.849380][ T2673] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 77.858776][ T2673] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 77.867413][ T2673] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 77.879272][ T3443] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 77.892709][ T9328] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 77.904662][ T9328] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 77.913438][ T2673] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 77.931740][ T3443] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 77.939569][ T3443] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 77.952017][ T9328] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 77.970678][ T2673] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 77.988871][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 77.997309][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready executing program [ 78.005472][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 78.015429][ T9328] device veth0_vlan entered promiscuous mode [ 78.027735][ T9328] device veth1_vlan entered promiscuous mode [ 78.038041][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 78.045980][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 78.077588][ T9328] ================================================================== [ 78.085792][ T9328] BUG: KASAN: use-after-free in macvlan_broadcast+0x547/0x620 [ 78.093278][ T9328] Read of size 4 at addr ffff88809ec73001 by task syz-executor731/9328 [ 78.101495][ T9328] [ 78.103859][ T9328] CPU: 0 PID: 9328 Comm: syz-executor731 Not tainted 5.5.0-rc5-syzkaller #0 [ 78.112564][ T9328] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 78.122647][ T9328] Call Trace: [ 78.125924][ T9328] dump_stack+0x197/0x210 [ 78.130260][ T9328] ? macvlan_broadcast+0x547/0x620 [ 78.135370][ T9328] print_address_description.constprop.0.cold+0xd4/0x30b [ 78.142392][ T9328] ? macvlan_broadcast+0x547/0x620 [ 78.147482][ T9328] ? macvlan_broadcast+0x547/0x620 [ 78.152571][ T9328] __kasan_report.cold+0x1b/0x41 [ 78.157487][ T9328] ? validate_xmit_xfrm+0x3d0/0xf10 [ 78.162665][ T9328] ? macvlan_broadcast+0x547/0x620 [ 78.167762][ T9328] kasan_report+0x12/0x20 [ 78.172131][ T9328] __asan_report_load_n_noabort+0xf/0x20 [ 78.177744][ T9328] macvlan_broadcast+0x547/0x620 [ 78.182705][ T9328] ? validate_xmit_skb+0x81f/0xe50 [ 78.187806][ T9328] macvlan_start_xmit+0x402/0x77f [ 78.192817][ T9328] dev_direct_xmit+0x419/0x630 [ 78.197561][ T9328] ? __check_heap_object+0x51/0xb3 [ 78.202649][ T9328] ? validate_xmit_skb_list+0x150/0x150 [ 78.208175][ T9328] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 78.214391][ T9328] ? netdev_pick_tx+0x14e/0xb00 [ 78.219314][ T9328] packet_direct_xmit+0x1a9/0x250 [ 78.224319][ T9328] packet_sendmsg+0x260d/0x6220 [ 78.229155][ T9328] ? ___might_sleep+0x163/0x2c0 [ 78.233986][ T9328] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 78.240207][ T9328] ? aa_label_sk_perm+0x91/0xf0 [ 78.245055][ T9328] ? packet_notifier+0x880/0x880 [ 78.249982][ T9328] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 78.255522][ T9328] ? apparmor_socket_sendmsg+0x2a/0x30 [ 78.261018][ T9328] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 78.267251][ T9328] ? security_socket_sendmsg+0x8d/0xc0 [ 78.272690][ T9328] ? packet_notifier+0x880/0x880 [ 78.277609][ T9328] sock_sendmsg+0xd7/0x130 [ 78.282044][ T9328] __sys_sendto+0x262/0x380 [ 78.286531][ T9328] ? __ia32_sys_getpeername+0xb0/0xb0 [ 78.292028][ T9328] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 78.298168][ T9328] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 78.303899][ T9328] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 78.309873][ T9328] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 78.315324][ T9328] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 78.320774][ T9328] ? do_syscall_64+0x26/0x790 [ 78.325432][ T9328] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 78.331490][ T9328] __x64_sys_sendto+0xe1/0x1a0 [ 78.336239][ T9328] do_syscall_64+0xfa/0x790 [ 78.340737][ T9328] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 78.346607][ T9328] RIP: 0033:0x442529 [ 78.350481][ T9328] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 5b 10 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 78.370063][ T9328] RSP: 002b:00007fff5a33a9e8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c [ 78.378467][ T9328] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000442529 [ 78.386414][ T9328] RDX: 000000000000000e RSI: 0000000020000080 RDI: 0000000000000003 [ 78.394364][ T9328] RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 [ 78.402312][ T9328] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 78.410708][ T9328] R13: 0000000000403aa0 R14: 0000000000000000 R15: 0000000000000000 [ 78.418674][ T9328] [ 78.420980][ T9328] Allocated by task 9325: [ 78.425289][ T9328] save_stack+0x23/0x90 [ 78.429431][ T9328] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 78.435037][ T9328] kasan_slab_alloc+0xf/0x20 [ 78.439796][ T9328] kmem_cache_alloc+0x121/0x710 [ 78.444639][ T9328] getname_flags+0xd6/0x5b0 [ 78.449137][ T9328] getname+0x1a/0x20 [ 78.453064][ T9328] do_sys_open+0x2c9/0x5d0 [ 78.457461][ T9328] __x64_sys_open+0x7e/0xc0 [ 78.461943][ T9328] do_syscall_64+0xfa/0x790 [ 78.466427][ T9328] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 78.472304][ T9328] [ 78.474611][ T9328] Freed by task 9325: [ 78.478572][ T9328] save_stack+0x23/0x90 [ 78.482703][ T9328] __kasan_slab_free+0x102/0x150 [ 78.487619][ T9328] kasan_slab_free+0xe/0x10 [ 78.492099][ T9328] kmem_cache_free+0x86/0x320 [ 78.496768][ T9328] putname+0xef/0x130 [ 78.500739][ T9328] do_sys_open+0x318/0x5d0 [ 78.505131][ T9328] __x64_sys_open+0x7e/0xc0 [ 78.509635][ T9328] do_syscall_64+0xfa/0x790 [ 78.514119][ T9328] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 78.519983][ T9328] [ 78.522293][ T9328] The buggy address belongs to the object at ffff88809ec72300 [ 78.522293][ T9328] which belongs to the cache names_cache of size 4096 [ 78.536425][ T9328] The buggy address is located 3329 bytes inside of [ 78.536425][ T9328] 4096-byte region [ffff88809ec72300, ffff88809ec73300) [ 78.549856][ T9328] The buggy address belongs to the page: [ 78.555468][ T9328] page:ffffea00027b1c80 refcount:1 mapcount:0 mapping:ffff8880aa5fda80 index:0x0 compound_mapcount: 0 [ 78.566377][ T9328] raw: 00fffe0000010200 ffffea00027c6308 ffffea00027fe988 ffff8880aa5fda80 [ 78.574951][ T9328] raw: 0000000000000000 ffff88809ec72300 0000000100000001 0000000000000000 [ 78.583512][ T9328] page dumped because: kasan: bad access detected [ 78.589902][ T9328] [ 78.592209][ T9328] Memory state around the buggy address: [ 78.597820][ T9328] ffff88809ec72f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 78.605858][ T9328] ffff88809ec72f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 78.613896][ T9328] >ffff88809ec73000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 78.621933][ T9328] ^ [ 78.625977][ T9328] ffff88809ec73080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 78.634027][ T9328] ffff88809ec73100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 78.642064][ T9328] ================================================================== [ 78.650098][ T9328] Disabling lock debugging due to kernel taint [ 78.656294][ T9328] Kernel panic - not syncing: panic_on_warn set ... [ 78.662876][ T9328] CPU: 0 PID: 9328 Comm: syz-executor731 Tainted: G B 5.5.0-rc5-syzkaller #0 [ 78.672911][ T9328] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 78.682942][ T9328] Call Trace: [ 78.686216][ T9328] dump_stack+0x197/0x210 [ 78.690526][ T9328] panic+0x2e3/0x75c [ 78.694396][ T9328] ? add_taint.cold+0x16/0x16 [ 78.699153][ T9328] ? trace_hardirqs_on+0x5e/0x240 [ 78.704156][ T9328] ? trace_hardirqs_on+0x5e/0x240 [ 78.709157][ T9328] ? macvlan_broadcast+0x547/0x620 [ 78.714332][ T9328] end_report+0x47/0x4f [ 78.718463][ T9328] ? macvlan_broadcast+0x547/0x620 [ 78.723547][ T9328] __kasan_report.cold+0xe/0x41 [ 78.728375][ T9328] ? validate_xmit_xfrm+0x3d0/0xf10 [ 78.733549][ T9328] ? macvlan_broadcast+0x547/0x620 [ 78.738636][ T9328] kasan_report+0x12/0x20 [ 78.742946][ T9328] __asan_report_load_n_noabort+0xf/0x20 [ 78.748561][ T9328] macvlan_broadcast+0x547/0x620 [ 78.753490][ T9328] ? validate_xmit_skb+0x81f/0xe50 [ 78.758588][ T9328] macvlan_start_xmit+0x402/0x77f [ 78.763606][ T9328] dev_direct_xmit+0x419/0x630 [ 78.768360][ T9328] ? __check_heap_object+0x51/0xb3 [ 78.773454][ T9328] ? validate_xmit_skb_list+0x150/0x150 [ 78.778982][ T9328] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 78.785206][ T9328] ? netdev_pick_tx+0x14e/0xb00 [ 78.790041][ T9328] packet_direct_xmit+0x1a9/0x250 [ 78.795096][ T9328] packet_sendmsg+0x260d/0x6220 [ 78.799931][ T9328] ? ___might_sleep+0x163/0x2c0 [ 78.804777][ T9328] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 78.811006][ T9328] ? aa_label_sk_perm+0x91/0xf0 [ 78.815863][ T9328] ? packet_notifier+0x880/0x880 [ 78.820781][ T9328] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 78.826304][ T9328] ? apparmor_socket_sendmsg+0x2a/0x30 [ 78.831748][ T9328] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 78.837968][ T9328] ? security_socket_sendmsg+0x8d/0xc0 [ 78.843410][ T9328] ? packet_notifier+0x880/0x880 [ 78.848340][ T9328] sock_sendmsg+0xd7/0x130 [ 78.852733][ T9328] __sys_sendto+0x262/0x380 [ 78.857226][ T9328] ? __ia32_sys_getpeername+0xb0/0xb0 [ 78.862588][ T9328] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 78.868722][ T9328] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 78.874243][ T9328] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 78.880203][ T9328] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 78.885642][ T9328] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 78.891687][ T9328] ? do_syscall_64+0x26/0x790 [ 78.896340][ T9328] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 78.902386][ T9328] __x64_sys_sendto+0xe1/0x1a0 [ 78.907141][ T9328] do_syscall_64+0xfa/0x790 [ 78.911640][ T9328] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 78.917508][ T9328] RIP: 0033:0x442529 [ 78.921376][ T9328] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 5b 10 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 78.940955][ T9328] RSP: 002b:00007fff5a33a9e8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c [ 78.949339][ T9328] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000442529 [ 78.957284][ T9328] RDX: 000000000000000e RSI: 0000000020000080 RDI: 0000000000000003 [ 78.965228][ T9328] RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 [ 78.973177][ T9328] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 78.981131][ T9328] R13: 0000000000403aa0 R14: 0000000000000000 R15: 0000000000000000 [ 78.990550][ T9328] Kernel Offset: disabled [ 78.994871][ T9328] Rebooting in 86400 seconds..