[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 19.070867] audit: type=1400 audit(1521071769.623:6): avc: denied { map } for pid=4223 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.45' (ECDSA) to the list of known hosts. syzkaller login: [ 172.789060] audit: type=1400 audit(1521071923.341:7): avc: denied { map } for pid=4240 comm="syzkaller887270" path="/root/syzkaller887270196" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 172.799621] IPVS: ftp: loaded support on port[0] = 21 net.ipv6.conf.syz_tun.accept_dad = 0 net.ipv6.conf.syz_tun.router_solicitations = 0 [ 172.842125] IPVS: ftp: loaded support on port[0] = 21 net.ipv6.conf.syz_tun.accept_dad = 0 net.ipv6.conf.syz_tun.router_solicitations = 0 [ 172.867412] IPVS: ftp: loaded support on port[0] = 21 net.ipv6.conf.syz_tun.accept_dad = 0 net.ipv6.conf.syz_tun.router_solicitations = 0 [ 172.896123] IPVS: ftp: loaded support on port[0] = 21 net.ipv6.conf.syz_tun.accept_dad = 0 net.ipv6.conf.syz_tun.router_solicitations = 0 [ 172.934207] IPVS: ftp: loaded support on port[0] = 21 net.ipv6.conf.syz_tun.accept_dad = 0 [ 172.978629] IPVS: ftp: loaded support on port[0] = 21 net.ipv6.conf.syz_tun.router_solicitations = 0 net.ipv6.conf.syz_tun.accept_dad = 0 [ 173.032599] IPVS: ftp: loaded support on port[0] = 21 net.ipv6.conf.syz_tun.router_solicitations = 0 net.ipv6.conf.syz_tun.accept_dad = 0 [ 173.087462] IPVS: ftp: loaded support on port[0] = 21 net.ipv6.conf.syz_tun.router_solicitations = 0 net.ipv6.conf.syz_tun.accept_dad = 0 RTNETLINK answers: File exists net.ipv6.conf.syz_tun.router_solicitations = 0 RTNETLINK answers: File exists RTNETLINK answers: File exists RTNETLINK answers: File exists RTNETLINK answers: File exists RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: File exists RTNETLINK answers: File exists RTNETLINK answers: File exists RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported [ 173.651502] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported [ 173.710247] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported [ 173.802656] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 173.830781] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported [ 173.911510] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported [ 173.987790] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available [ 174.036452] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 174.052313] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument [ 175.483786] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 175.489997] 8021q: adding VLAN 0 to HW filter on device bond0 [ 175.523412] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 175.529659] 8021q: adding VLAN 0 to HW filter on device bond0 [ 175.655922] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 175.662118] 8021q: adding VLAN 0 to HW filter on device bond0 [ 175.739069] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 175.812613] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 175.818892] 8021q: adding VLAN 0 to HW filter on device bond0 [ 175.832507] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 175.848562] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 175.854681] 8021q: adding VLAN 0 to HW filter on device bond0 [ 175.891595] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 175.897717] 8021q: adding VLAN 0 to HW filter on device bond0 [ 175.927880] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready executing program [ 176.000150] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 176.006403] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 176.020574] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 176.036196] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 176.042421] 8021q: adding VLAN 0 to HW filter on device bond0 [ 176.095696] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 176.102055] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 176.110930] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 176.126549] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 176.134768] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready executing program executing program [ 176.140863] 8021q: adding VLAN 0 to HW filter on device bond0 [ 176.155544] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 176.163697] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready executing program executing program executing program [ 176.233358] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 176.239654] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 176.254162] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready executing program [ 176.336519] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 176.345533] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready executing program executing program [ 176.407242] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 176.413468] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 176.432589] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready executing program executing program executing program executing program [ 176.455139] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 176.463164] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 176.490960] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready executing program executing program executing program [ 176.518337] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 176.524554] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 176.542869] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready executing program executing program executing program executing program executing program executing program executing program executing program [ 176.777061] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 176.783360] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 176.794439] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready executing program executing program executing program executing program [ 176.838125] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 176.844348] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 176.859689] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 213.646069] ================================================================== [ 213.653578] BUG: KASAN: use-after-free in pfifo_fast_enqueue+0x4bc/0x5e0 [ 213.660411] Read of size 4 at addr ffff8801cc554728 by task syzkaller887270/9305 [ 213.667926] [ 213.669548] CPU: 1 PID: 9305 Comm: syzkaller887270 Not tainted 4.16.0-rc5+ #353 [ 213.676980] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 213.686318] Call Trace: [ 213.688897] dump_stack+0x194/0x24d [ 213.692521] ? arch_local_irq_restore+0x53/0x53 [ 213.697180] ? show_regs_print_info+0x18/0x18 [ 213.701670] ? retint_kernel+0x10/0x10 [ 213.705549] ? pfifo_fast_enqueue+0x4bc/0x5e0 [ 213.710037] print_address_description+0x73/0x250 [ 213.714871] ? pfifo_fast_enqueue+0x4bc/0x5e0 [ 213.719359] kasan_report+0x23c/0x360 [ 213.723158] __asan_report_load4_noabort+0x14/0x20 [ 213.728077] pfifo_fast_enqueue+0x4bc/0x5e0 [ 213.732398] ? pfifo_fast_dequeue+0xb00/0xb00 [ 213.736901] __dev_queue_xmit+0xd50/0x2f30 [ 213.741127] ? __lock_acquire+0x664/0x3e00 [ 213.745369] ? netdev_pick_tx+0x2c0/0x2c0 [ 213.749516] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 213.754699] ? __lock_is_held+0xb6/0x140 [ 213.758770] ? netif_rx_internal+0x14f/0x940 [ 213.763174] ? print_irqtrace_events+0x270/0x270 [ 213.767929] ? trace_hardirqs_off+0x10/0x10 [ 213.772249] ? selinux_ip_postroute+0x541/0xee0 [ 213.776918] ? selinux_ip_postroute_compat+0x6b0/0x6b0 [ 213.782197] ? trace_hardirqs_off+0x10/0x10 [ 213.786508] ? mark_held_locks+0xaf/0x100 [ 213.790649] ? do_softirq.part.19+0xd1/0x190 [ 213.795053] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 213.800061] ? trace_hardirqs_on+0xd/0x10 [ 213.804212] ? print_irqtrace_events+0x270/0x270 [ 213.808971] ? ip6_finish_output+0x69b/0xaf0 [ 213.813369] ? lock_downgrade+0x980/0x980 [ 213.817503] ? lock_downgrade+0x980/0x980 [ 213.821650] ? lock_release+0xa40/0xa40 [ 213.825612] ? dev_loopback_xmit+0x263/0x670 [ 213.830019] ? mark_held_locks+0xaf/0x100 [ 213.834167] dev_queue_xmit+0x17/0x20 [ 213.837960] ? dev_queue_xmit+0x17/0x20 [ 213.841923] ip6_finish_output2+0x1492/0x23a0 [ 213.846431] ? ip6_copy_metadata+0xad0/0xad0 [ 213.850835] ? ip6_mtu+0x369/0x4d0 [ 213.854364] ? lock_downgrade+0x980/0x980 [ 213.858518] ? __lock_is_held+0xb6/0x140 [ 213.862597] ? netif_rx_ni+0x3c0/0x3c0 [ 213.866474] ? nf_nat_ipv6_out+0x262/0x570 [ 213.870715] ip6_finish_output+0x69b/0xaf0 [ 213.874944] ? ip6_finish_output+0x69b/0xaf0 [ 213.879354] ip6_output+0x1eb/0x840 [ 213.883001] ? ip6_finish_output+0xaf0/0xaf0 [ 213.887405] ? lock_acquire+0x1d5/0x580 [ 213.891371] ? rawv6_sendmsg+0x1d86/0x40c0 [ 213.895608] ? ip6_fragment+0x3470/0x3470 [ 213.899764] ip6_local_out+0x95/0x160 [ 213.903561] ip6_send_skb+0xa1/0x330 [ 213.907271] ip6_push_pending_frames+0xb3/0xe0 [ 213.911843] rawv6_sendmsg+0x2f96/0x40c0 [ 213.915891] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 213.921069] ? mutex_remove_waiter+0x5b1/0x770 [ 213.925662] ? rawv6_getsockopt+0xf0/0xf0 [ 213.929816] ? avc_has_perm+0x35e/0x680 [ 213.933785] ? lock_downgrade+0x980/0x980 [ 213.937932] ? lock_release+0xa40/0xa40 [ 213.941935] ? avc_has_perm+0x43e/0x680 executing program [ 213.945908] ? avc_has_perm_noaudit+0x520/0x520 [ 213.950579] ? find_held_lock+0x35/0x1d0 [ 213.954649] ? lock_downgrade+0x980/0x980 [ 213.958793] ? rw_copy_check_uvector+0x1be/0x280 [ 213.963584] inet_sendmsg+0x11f/0x5e0 [ 213.967373] ? inet_sendmsg+0x11f/0x5e0 [ 213.971335] ? copy_msghdr_from_user+0x3a6/0x590 [ 213.976080] ? rcu_pm_notify+0xc0/0xc0 [ 213.979960] ? inet_create+0xf50/0xf50 [ 213.983843] ? selinux_socket_sendmsg+0x36/0x40 [ 213.988503] ? security_socket_sendmsg+0x89/0xb0 [ 213.993252] ? inet_create+0xf50/0xf50 [ 213.997137] sock_sendmsg+0xca/0x110 [ 214.000848] ___sys_sendmsg+0x320/0x8b0 [ 214.004827] ? copy_msghdr_from_user+0x590/0x590 [ 214.009588] ? __schedule+0x903/0x1ec0 [ 214.013483] ? find_held_lock+0x35/0x1d0 [ 214.017552] ? __might_fault+0x110/0x1d0 [ 214.021605] ? lock_downgrade+0x980/0x980 [ 214.025772] ? rcu_note_context_switch+0x710/0x710 [ 214.030694] ? check_same_owner+0x320/0x320 [ 214.035003] ? __might_sleep+0x95/0x190 [ 214.038979] __sys_sendmmsg+0x1ee/0x620 [ 214.042949] ? __sys_sendmmsg+0x1ee/0x620 executing program [ 214.047100] ? SyS_sendmsg+0x50/0x50 [ 214.050816] ? SYSC_connect+0x2e0/0x4a0 [ 214.054785] ? __schedule+0x1ec0/0x1ec0 [ 214.058748] ? SYSC_bind+0x410/0x410 [ 214.062482] ? SyS_futex+0x269/0x390 [ 214.066199] ? do_futex+0x22a0/0x22a0 [ 214.069995] ? exit_to_usermode_loop+0x198/0x2f0 [ 214.074739] ? vfs_writev+0x340/0x340 [ 214.078534] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 214.084072] SyS_sendmmsg+0x35/0x60 [ 214.087687] ? __sys_sendmmsg+0x620/0x620 [ 214.091830] do_syscall_64+0x281/0x940 executing program [ 214.095710] ? __do_page_fault+0xc90/0xc90 [ 214.099944] ? finish_task_switch+0x1c1/0x7e0 [ 214.104435] ? syscall_return_slowpath+0x550/0x550 [ 214.109361] ? syscall_return_slowpath+0x2ac/0x550 [ 214.114285] ? prepare_exit_to_usermode+0x350/0x350 [ 214.119293] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 214.124655] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 214.129503] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 214.134676] RIP: 0033:0x447bb9 [ 214.138116] RSP: 002b:00007fab24d5ad58 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 214.145815] RAX: ffffffffffffffda RBX: 00000000006e3a1c RCX: 0000000000447bb9 [ 214.153073] RDX: 0000000000000249 RSI: 0000000020001300 RDI: 0000000000000007 [ 214.160334] RBP: 0000000000000000 R08: 0000000020000000 R09: 0000000020000000 [ 214.167589] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006e3a18 [ 214.174850] R13: 00007ffc3eda88df R14: 00007fab24d5b9c0 R15: 0000000000000009 [ 214.182131] [ 214.183742] Allocated by task 9305: [ 214.187360] save_stack+0x43/0xd0 [ 214.190799] kasan_kmalloc+0xad/0xe0 [ 214.194521] kasan_slab_alloc+0x12/0x20 [ 214.198487] kmem_cache_alloc_node+0x144/0x760 [ 214.203058] __alloc_skb+0xf1/0x780 [ 214.206676] sock_wmalloc+0x140/0x1d0 [ 214.210467] __ip6_append_data.isra.43+0x26b9/0x3390 [ 214.215559] ip6_append_data+0x189/0x290 [ 214.219608] rawv6_sendmsg+0x1e09/0x40c0 [ 214.223657] inet_sendmsg+0x11f/0x5e0 [ 214.227445] sock_sendmsg+0xca/0x110 [ 214.231149] ___sys_sendmsg+0x320/0x8b0 [ 214.235109] __sys_sendmmsg+0x1ee/0x620 [ 214.239071] SyS_sendmmsg+0x35/0x60 [ 214.242688] do_syscall_64+0x281/0x940 [ 214.246562] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 214.251731] [ 214.253342] Freed by task 9336: [ 214.256611] save_stack+0x43/0xd0 [ 214.260051] __kasan_slab_free+0x11a/0x170 [ 214.264274] kasan_slab_free+0xe/0x10 [ 214.268061] kmem_cache_free+0x83/0x2a0 [ 214.272026] kfree_skbmem+0x1a1/0x1d0 [ 214.275819] kfree_skb+0x165/0x4c0 [ 214.279348] ip_tunnel_xmit+0x710/0x3550 [ 214.283396] __gre_xmit+0x546/0x8b0 [ 214.287009] erspan_xmit+0x779/0x22a0 [ 214.290794] dev_hard_start_xmit+0x24e/0xac0 [ 214.295193] sch_direct_xmit+0x40d/0x1140 [ 214.299329] __qdisc_run+0x57d/0x19c0 [ 214.303117] __dev_queue_xmit+0xd5e/0x2f30 [ 214.307337] dev_queue_xmit+0x17/0x20 [ 214.311130] ip6_finish_output2+0x1492/0x23a0 [ 214.315614] ip6_finish_output+0x69b/0xaf0 [ 214.319836] ip6_output+0x1eb/0x840 [ 214.323451] ip6_local_out+0x95/0x160 [ 214.327243] ip6_send_skb+0xa1/0x330 [ 214.330947] ip6_push_pending_frames+0xb3/0xe0 [ 214.335518] rawv6_sendmsg+0x2f96/0x40c0 [ 214.339570] inet_sendmsg+0x11f/0x5e0 [ 214.343358] sock_sendmsg+0xca/0x110 [ 214.347061] ___sys_sendmsg+0x320/0x8b0 [ 214.351024] __sys_sendmmsg+0x1ee/0x620 [ 214.354984] SyS_sendmmsg+0x35/0x60 [ 214.358598] do_syscall_64+0x281/0x940 [ 214.362478] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 214.367647] [ 214.369262] The buggy address belongs to the object at ffff8801cc554700 [ 214.369262] which belongs to the cache skbuff_head_cache of size 232 [ 214.382425] The buggy address is located 40 bytes inside of [ 214.382425] 232-byte region [ffff8801cc554700, ffff8801cc5547e8) [ 214.394193] The buggy address belongs to the page: [ 214.399109] page:ffffea0007315500 count:1 mapcount:0 mapping:ffff8801cc5540c0 index:0x0 [ 214.407242] flags: 0x2fffc0000000100(slab) [ 214.411469] raw: 02fffc0000000100 ffff8801cc5540c0 0000000000000000 000000010000000c [ 214.419342] raw: ffffea0006cf5ca0 ffffea0006c74f60 ffff8801d9bec680 0000000000000000 [ 214.427207] page dumped because: kasan: bad access detected [ 214.432905] [ 214.434515] Memory state around the buggy address: [ 214.439445] ffff8801cc554600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 214.446794] ffff8801cc554680: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc [ 214.454140] >ffff8801cc554700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 214.461484] ^ [ 214.466140] ffff8801cc554780: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc [ 214.473487] ffff8801cc554800: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 214.480827] ================================================================== [ 214.488171] Disabling lock debugging due to kernel taint [ 214.493674] Kernel panic - not syncing: panic_on_warn set ... [ 214.493674] [ 214.501024] CPU: 1 PID: 9305 Comm: syzkaller887270 Tainted: G B 4.16.0-rc5+ #353 [ 214.509754] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 214.519090] Call Trace: [ 214.521667] dump_stack+0x194/0x24d [ 214.525285] ? arch_local_irq_restore+0x53/0x53 [ 214.529939] ? kasan_end_report+0x32/0x50 [ 214.534073] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 214.538814] ? vsnprintf+0x1ed/0x1900 [ 214.542605] ? pfifo_fast_enqueue+0x470/0x5e0 [ 214.547103] panic+0x1e4/0x41c [ 214.550277] ? refcount_error_report+0x214/0x214 [ 214.555019] ? add_taint+0x1c/0x50 [ 214.558546] ? add_taint+0x1c/0x50 [ 214.562073] ? pfifo_fast_enqueue+0x4bc/0x5e0 [ 214.566557] kasan_end_report+0x50/0x50 [ 214.570519] kasan_report+0x149/0x360 [ 214.574309] __asan_report_load4_noabort+0x14/0x20 [ 214.579222] pfifo_fast_enqueue+0x4bc/0x5e0 [ 214.583534] ? pfifo_fast_dequeue+0xb00/0xb00 [ 214.588028] __dev_queue_xmit+0xd50/0x2f30 [ 214.592256] ? __lock_acquire+0x664/0x3e00 [ 214.596487] ? netdev_pick_tx+0x2c0/0x2c0 [ 214.600627] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 214.605802] ? __lock_is_held+0xb6/0x140 [ 214.609859] ? netif_rx_internal+0x14f/0x940 [ 214.614263] ? print_irqtrace_events+0x270/0x270 [ 214.619011] ? trace_hardirqs_off+0x10/0x10 [ 214.623323] ? selinux_ip_postroute+0x541/0xee0 [ 214.627987] ? selinux_ip_postroute_compat+0x6b0/0x6b0 [ 214.633257] ? trace_hardirqs_off+0x10/0x10 [ 214.637565] ? mark_held_locks+0xaf/0x100 [ 214.641705] ? do_softirq.part.19+0xd1/0x190 [ 214.646100] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 214.651102] ? trace_hardirqs_on+0xd/0x10 [ 214.655253] ? print_irqtrace_events+0x270/0x270 [ 214.660017] ? ip6_finish_output+0x69b/0xaf0 [ 214.664415] ? lock_downgrade+0x980/0x980 [ 214.668551] ? lock_downgrade+0x980/0x980 [ 214.672689] ? lock_release+0xa40/0xa40 [ 214.676652] ? dev_loopback_xmit+0x263/0x670 [ 214.681049] ? mark_held_locks+0xaf/0x100 [ 214.685197] dev_queue_xmit+0x17/0x20 [ 214.688989] ? dev_queue_xmit+0x17/0x20 [ 214.692954] ip6_finish_output2+0x1492/0x23a0 [ 214.697441] ? ip6_copy_metadata+0xad0/0xad0 [ 214.701837] ? ip6_mtu+0x369/0x4d0 [ 214.705372] ? lock_downgrade+0x980/0x980 [ 214.709514] ? __lock_is_held+0xb6/0x140 [ 214.713573] ? netif_rx_ni+0x3c0/0x3c0 [ 214.717446] ? nf_nat_ipv6_out+0x262/0x570 [ 214.721670] ip6_finish_output+0x69b/0xaf0 [ 214.725888] ? ip6_finish_output+0x69b/0xaf0 [ 214.730286] ip6_output+0x1eb/0x840 [ 214.733904] ? ip6_finish_output+0xaf0/0xaf0 [ 214.738299] ? lock_acquire+0x1d5/0x580 [ 214.742258] ? rawv6_sendmsg+0x1d86/0x40c0 [ 214.746484] ? ip6_fragment+0x3470/0x3470 [ 214.750624] ip6_local_out+0x95/0x160 [ 214.754416] ip6_send_skb+0xa1/0x330 [ 214.758122] ip6_push_pending_frames+0xb3/0xe0 [ 214.762695] rawv6_sendmsg+0x2f96/0x40c0 [ 214.766741] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 214.771917] ? mutex_remove_waiter+0x5b1/0x770 [ 214.776496] ? rawv6_getsockopt+0xf0/0xf0 [ 214.780631] ? avc_has_perm+0x35e/0x680 [ 214.784593] ? lock_downgrade+0x980/0x980 [ 214.788732] ? lock_release+0xa40/0xa40 [ 214.792711] ? avc_has_perm+0x43e/0x680 [ 214.796673] ? avc_has_perm_noaudit+0x520/0x520 [ 214.801330] ? find_held_lock+0x35/0x1d0 [ 214.805386] ? lock_downgrade+0x980/0x980 [ 214.809525] ? rw_copy_check_uvector+0x1be/0x280 [ 214.814287] inet_sendmsg+0x11f/0x5e0 [ 214.818076] ? inet_sendmsg+0x11f/0x5e0 [ 214.822038] ? copy_msghdr_from_user+0x3a6/0x590 [ 214.826780] ? rcu_pm_notify+0xc0/0xc0 [ 214.830653] ? inet_create+0xf50/0xf50 [ 214.834525] ? selinux_socket_sendmsg+0x36/0x40 [ 214.839183] ? security_socket_sendmsg+0x89/0xb0 [ 214.843927] ? inet_create+0xf50/0xf50 [ 214.847801] sock_sendmsg+0xca/0x110 [ 214.851501] ___sys_sendmsg+0x320/0x8b0 [ 214.855466] ? copy_msghdr_from_user+0x590/0x590 [ 214.860210] ? __schedule+0x903/0x1ec0 [ 214.864093] ? find_held_lock+0x35/0x1d0 [ 214.868147] ? __might_fault+0x110/0x1d0 [ 214.872194] ? lock_downgrade+0x980/0x980 [ 214.876337] ? rcu_note_context_switch+0x710/0x710 [ 214.881250] ? check_same_owner+0x320/0x320 [ 214.885557] ? __might_sleep+0x95/0x190 [ 214.889522] __sys_sendmmsg+0x1ee/0x620 [ 214.893482] ? __sys_sendmmsg+0x1ee/0x620 [ 214.897623] ? SyS_sendmsg+0x50/0x50 [ 214.901331] ? SYSC_connect+0x2e0/0x4a0 [ 214.905290] ? __schedule+0x1ec0/0x1ec0 [ 214.909253] ? SYSC_bind+0x410/0x410 [ 214.912962] ? SyS_futex+0x269/0x390 [ 214.916670] ? do_futex+0x22a0/0x22a0 [ 214.920462] ? exit_to_usermode_loop+0x198/0x2f0 [ 214.925202] ? vfs_writev+0x340/0x340 [ 214.928993] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 214.934525] SyS_sendmmsg+0x35/0x60 [ 214.938137] ? __sys_sendmmsg+0x620/0x620 [ 214.942274] do_syscall_64+0x281/0x940 [ 214.946147] ? __do_page_fault+0xc90/0xc90 [ 214.950378] ? finish_task_switch+0x1c1/0x7e0 [ 214.954862] ? syscall_return_slowpath+0x550/0x550 [ 214.959778] ? syscall_return_slowpath+0x2ac/0x550 [ 214.964698] ? prepare_exit_to_usermode+0x350/0x350 [ 214.969706] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 214.975069] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 214.979902] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 214.985074] RIP: 0033:0x447bb9 [ 214.988246] RSP: 002b:00007fab24d5ad58 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 214.995938] RAX: ffffffffffffffda RBX: 00000000006e3a1c RCX: 0000000000447bb9 [ 215.003190] RDX: 0000000000000249 RSI: 0000000020001300 RDI: 0000000000000007 [ 215.010450] RBP: 0000000000000000 R08: 0000000020000000 R09: 0000000020000000 [ 215.017703] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006e3a18 [ 215.024955] R13: 00007ffc3eda88df R14: 00007fab24d5b9c0 R15: 0000000000000009 [ 215.032623] Dumping ftrace buffer: [ 215.036139] (ftrace buffer empty) [ 215.039817] Kernel Offset: disabled [ 215.043413] Rebooting in 86400 seconds..