[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 40.406256] audit: type=1800 audit(1545803546.828:25): pid=7847 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 40.441913] audit: type=1800 audit(1545803546.828:26): pid=7847 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 40.479029] audit: type=1800 audit(1545803546.838:27): pid=7847 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 syzkaller login: [ 45.215072] sshd (7984) used greatest stack depth: 15720 bytes left Warning: Permanently added '10.128.0.5' (ECDSA) to the list of known hosts. RTNETLINK answers: No buffer space available RTNETLINK answers: No buffer space available [ 51.975841] IPVS: ftp: loaded support on port[0] = 21 net.ipv6.conf.syz_tun.accept_dad = 0 net.ipv6.conf.syz_tun.router_solicitations = 0 [ 52.243726] bridge0: port 1(bridge_slave_0) entered blocking state [ 52.250584] bridge0: port 1(bridge_slave_0) entered disabled state [ 52.258453] device bridge_slave_0 entered promiscuous mode [ 52.277863] bridge0: port 2(bridge_slave_1) entered blocking state [ 52.284463] bridge0: port 2(bridge_slave_1) entered disabled state [ 52.291441] device bridge_slave_1 entered promiscuous mode [ 52.310170] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 52.329399] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 52.381724] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 52.404267] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 52.484000] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 52.491345] team0: Port device team_slave_0 added [ 52.510049] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 52.517528] team0: Port device team_slave_1 added [ 52.536122] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 52.559207] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 52.578724] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 52.599848] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported [ 52.752384] bridge0: port 2(bridge_slave_1) entered blocking state [ 52.758905] bridge0: port 2(bridge_slave_1) entered forwarding state [ 52.765981] bridge0: port 1(bridge_slave_0) entered blocking state [ 52.772313] bridge0: port 1(bridge_slave_0) entered forwarding state RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument [ 53.320272] 8021q: adding VLAN 0 to HW filter on device bond0 [ 53.373971] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 53.427719] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 53.434170] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 53.441711] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 53.499208] 8021q: adding VLAN 0 to HW filter on device team0 executing program [ 53.820366] kasan: CONFIG_KASAN_INLINE enabled [ 53.825218] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 53.832593] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 53.838819] CPU: 0 PID: 7999 Comm: syz-executor142 Not tainted 4.20.0-rc7-next-20181224 #188 [ 53.847374] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.856745] RIP: 0010:fdb_find_rcu+0x194/0xc90 [ 53.861336] Code: 40 84 c6 0f 85 23 09 00 00 84 c9 0f 95 c2 0f 9e c0 84 c2 0f 85 13 09 00 00 48 b9 00 00 00 00 00 fc ff df 4c 89 e0 48 c1 e8 03 <0f> b6 14 08 49 8d 44 24 05 48 89 c6 48 c1 ee 03 0f b6 0c 0e 4c 89 [ 53.880252] RSP: 0018:ffff8881b527f0b8 EFLAGS: 00010246 [ 53.885611] RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000 [ 53.892863] RDX: 0000000000000000 RSI: 1ffff11036a4fe01 RDI: ffff8881b527f1a8 [ 53.900135] RBP: ffff8881b527f310 R08: ffff8881b6e6e680 R09: ffffed103b585b8f [ 53.907407] R10: ffffed103b585b8f R11: ffff8881dac2dc7b R12: 0000000000000000 [ 53.914660] R13: 0000000000000001 R14: ffff8881baed6940 R15: ffff8881b527f2e8 [ 53.921929] FS: 0000000000a3b880(0000) GS:ffff8881dac00000(0000) knlGS:0000000000000000 [ 53.930154] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 53.936017] CR2: 0000000020000180 CR3: 00000001b1977000 CR4: 00000000001406f0 [ 53.943277] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 53.950545] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 53.957801] Call Trace: [ 53.960387] ? __kmalloc_node_track_caller+0x3c/0x70 [ 53.965476] ? rcu_read_lock_sched_held+0x108/0x120 [ 53.970477] ? kasan_kmalloc+0xcb/0xd0 [ 53.974349] ? br_fdb_clear_offload+0x370/0x370 [ 53.978997] ? __kmalloc_node_track_caller+0x4d/0x70 [ 53.984092] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 53.989814] ? lock_acquire+0x1ed/0x520 [ 53.993774] ? br_fdb_dump+0x710/0x710 [ 53.997643] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.003164] ? check_preemption_disabled+0x48/0x280 [ 54.008166] ? kasan_check_read+0x11/0x20 [ 54.012308] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 54.017564] ? rcu_softirq_qs+0x20/0x20 [ 54.021526] ? netdev_master_upper_dev_get+0x173/0x250 [ 54.026786] br_fdb_get+0xac/0x230 [ 54.030313] ? br_fdb_dump+0x710/0x710 [ 54.034183] rtnl_fdb_get+0x8a0/0x13b0 [ 54.038055] ? rtnetlink_bind+0x90/0x90 [ 54.042009] ? graph_lock+0x270/0x270 [ 54.045790] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.051308] ? check_preemption_disabled+0x48/0x280 [ 54.056306] ? __lock_is_held+0xb5/0x140 [ 54.060357] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 54.065894] ? rtnl_get_link+0x170/0x370 [ 54.069963] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 54.075225] ? rtnetlink_bind+0x90/0x90 [ 54.079181] rtnetlink_rcv_msg+0x46a/0xc20 [ 54.083399] ? rtnetlink_put_metrics+0x690/0x690 [ 54.088144] netlink_rcv_skb+0x16c/0x430 [ 54.092185] ? rtnetlink_put_metrics+0x690/0x690 [ 54.096925] ? netlink_ack+0xb70/0xb70 [ 54.100798] ? rcu_read_unlock_special+0x370/0x370 [ 54.105712] rtnetlink_rcv+0x1c/0x20 [ 54.109408] netlink_unicast+0x59f/0x750 [ 54.113470] ? netlink_attachskb+0x9a0/0x9a0 [ 54.117862] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.123537] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 54.128580] netlink_sendmsg+0xa18/0xfc0 [ 54.132636] ? netlink_unicast+0x750/0x750 [ 54.136855] ? aa_sock_msg_perm.isra.14+0xba/0x160 [ 54.141768] ? apparmor_socket_sendmsg+0x29/0x30 [ 54.146504] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.152021] ? security_socket_sendmsg+0x94/0xc0 [ 54.156762] ? netlink_unicast+0x750/0x750 [ 54.160979] sock_sendmsg+0xd5/0x120 [ 54.164677] ___sys_sendmsg+0x7fd/0x930 [ 54.168644] ? copy_msghdr_from_user+0x580/0x580 [ 54.173383] ? graph_lock+0x270/0x270 [ 54.177163] ? print_usage_bug+0xc0/0xc0 [ 54.181200] ? lock_downgrade+0x900/0x900 [ 54.185334] ? check_preemption_disabled+0x48/0x280 [ 54.190331] ? graph_lock+0x270/0x270 [ 54.194164] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.199699] ? __fget_light+0x2e9/0x430 [ 54.203657] ? fget_raw+0x20/0x20 [ 54.207090] ? find_held_lock+0x36/0x1c0 [ 54.211141] ? __do_page_fault+0x62e/0xd70 [ 54.215359] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 54.220879] ? sockfd_lookup_light+0xc5/0x160 [ 54.225357] __sys_sendmsg+0x11d/0x280 [ 54.229226] ? __ia32_sys_shutdown+0x80/0x80 [ 54.233616] ? kasan_check_write+0x14/0x20 [ 54.237835] ? up_read+0x225/0x2c0 [ 54.241354] ? up_read_non_owner+0x100/0x100 [ 54.245749] ? do_syscall_64+0x9a/0x820 [ 54.249706] ? do_syscall_64+0x9a/0x820 [ 54.253666] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 54.259109] __x64_sys_sendmsg+0x78/0xb0 [ 54.263153] do_syscall_64+0x1b9/0x820 [ 54.267031] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 54.272377] ? syscall_return_slowpath+0x5e0/0x5e0 [ 54.277286] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 54.282116] ? trace_hardirqs_on_caller+0x310/0x310 [ 54.287128] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 54.292125] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.297645] ? prepare_exit_to_usermode+0x291/0x3b0 [ 54.302707] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 54.307540] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 54.312710] RIP: 0033:0x441679 [ 54.315895] 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 2b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 54.334784] RSP: 002b:00007ffdcc679018 EFLAGS: 00000213 ORIG_RAX: 000000000000002e [ 54.342476] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441679 [ 54.349726] RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000003 [ 54.356976] RBP: 00000000006cd018 R08: 0000000000000100 R09: 0000000000000100 [ 54.364235] R10: 0000000000000020 R11: 0000000000000213 R12: 0000000000402430 [ 54.371486] R13: 00000000004024c0 R14: 0000000000000000 R15: 0000000000000000 [ 54.378914] Modules linked in: [ 54.385958] ---[ end trace 0a8a8a0aabd7977e ]--- [ 54.390718] RIP: 0010:fdb_find_rcu+0x194/0xc90 [ 54.395327] Code: 40 84 c6 0f 85 23 09 00 00 84 c9 0f 95 c2 0f 9e c0 84 c2 0f 85 13 09 00 00 48 b9 00 00 00 00 00 fc ff df 4c 89 e0 48 c1 e8 03 <0f> b6 14 08 49 8d 44 24 05 48 89 c6 48 c1 ee 03 0f b6 0c 0e 4c 89 [ 54.414282] RSP: 0018:ffff8881b527f0b8 EFLAGS: 00010246 [ 54.419632] RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000 [ 54.426928] RDX: 0000000000000000 RSI: 1ffff11036a4fe01 RDI: ffff8881b527f1a8 [ 54.434222] RBP: ffff8881b527f310 R08: ffff8881b6e6e680 R09: ffffed103b585b8f [ 54.441500] R10: ffffed103b585b8f R11: ffff8881dac2dc7b R12: 0000000000000000 [ 54.448837] R13: 0000000000000001 R14: ffff8881baed6940 R15: ffff8881b527f2e8 [ 54.456143] FS: 0000000000a3b880(0000) GS:ffff8881dac00000(0000) knlGS:0000000000000000 [ 54.464401] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 54.470299] CR2: 0000000020000180 CR3: 00000001b1977000 CR4: 00000000001406f0 [ 54.477603] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 54.484988] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 54.492243] Kernel panic - not syncing: Fatal exception [ 54.498531] Kernel Offset: disabled [ 54.502155] Rebooting in 86400 seconds..