[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.050819] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[ 22.157144] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25h[?0c. [ 22.361765] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.328022] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.3' (ECDSA) to the list of known hosts. 2018/06/12 21:07:56 parsed 1 programs 2018/06/12 21:07:58 executed programs: 0 [ 32.367488] IPVS: Creating netns size=2552 id=1 [ 32.632409] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 32.648197] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 32.733722] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 32.749517] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 32.835395] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 32.850993] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 32.867562] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 32.885109] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 33.694211] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 33.736737] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 34.061721] syz-executor0 (4199) used greatest stack depth: 23824 bytes left [ 35.692855] ------------[ cut here ]------------ [ 35.697722] WARNING: CPU: 1 PID: 4369 at net/core/dev.c:2456 skb_warn_bad_offload+0x2af/0x380() [ 35.706714] sit0: caps=(0x00000000001b7869, 0x0000000000000000) len=65081 data_len=65033 gso_size=1432 gso_type=2 ip_summed=0 [ 35.718377] Kernel panic - not syncing: panic_on_warn set ... [ 35.718377] [ 35.725776] CPU: 1 PID: 4369 Comm: syz-executor0 Not tainted 4.4.136-ge4798d7 #58 [ 35.733382] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.742730] 0000000000000000 032d6d129f7f4302 ffff8801d36270b0 ffffffff81e0edad [ 35.750763] ffffffff83a43ec0 ffff8800b66c1800 ffffffff83ec6600 0000000000000009 [ 35.758783] 0000000000000998 ffff8801d3627170 ffffffff8140a184 0000000041b58ab3 [ 35.766810] Call Trace: [ 35.769389] [] dump_stack+0xc1/0x124 [ 35.774739] [] panic+0x19e/0x38d [ 35.779735] [] ? add_taint.cold.4+0x16/0x16 [ 35.785698] [] ? warn_slowpath_common.cold.6+0x5/0x20 [ 35.792524] [] warn_slowpath_common.cold.6+0x20/0x20 [ 35.799266] [] ? skb_warn_bad_offload+0x2af/0x380 [ 35.805753] [] warn_slowpath_fmt+0xbf/0x100 [ 35.811705] [] ? warn_slowpath_common+0x120/0x120 [ 35.818183] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 35.825095] [] ? ___ratelimit+0x53/0x3d2 [ 35.830790] [] skb_warn_bad_offload+0x2af/0x380 [ 35.837086] [] __skb_gso_segment+0x3ce/0x490 [ 35.843133] [] validate_xmit_skb.isra.103.part.104+0x48b/0xaa0 [ 35.850826] [] ? check_preemption_disabled+0x3b/0x170 [ 35.857654] [] __dev_queue_xmit+0x1687/0x1c80 [ 35.863875] [] ? __dev_queue_xmit+0x1d7/0x1c80 [ 35.870098] [] ? debug_check_no_locks_freed+0x210/0x210 [ 35.877094] [] ? nf_ct_deliver_cached_events+0x30e/0x560 [ 35.884182] [] ? netdev_pick_tx+0x2c0/0x2c0 [ 35.890193] [] ? __lock_acquire+0xa86/0x5270 [ 35.896241] [] ? ecache_work+0x250/0x250 [ 35.901942] [] ? check_preemption_disabled+0x3b/0x170 [ 35.908784] [] dev_queue_xmit+0x17/0x20 [ 35.914398] [] neigh_direct_output+0x15/0x20 [ 35.921136] [] ip6_finish_output2+0x929/0x1ca0 [ 35.927359] [] ? ip6_finish_output2+0x1d5/0x1ca0 [ 35.933767] [] ? ip6_sk_dst_lookup_flow+0x580/0x580 [ 35.940436] [] ? ip6_mtu+0x217/0x340 [ 35.945795] [] ip6_finish_output+0x3b8/0x760 [ 35.951851] [] ip6_output+0x1b8/0x520 [ 35.957294] [] ? ip6_finish_output+0x760/0x760 [ 35.963522] [] ? schedtune_can_attach+0x49a/0x6b0 [ 35.970008] [] ? ip6_fragment+0x3510/0x3510 [ 35.975982] [] ? xfrm_lookup_route+0x54/0x1b0 [ 35.982118] [] ip6_local_out+0x9b/0x180 [ 35.987738] [] ip6_send_skb+0xa1/0x340 [ 35.993266] [] udp_v6_send_skb+0x5ba/0xe70 [ 35.999138] [] udpv6_sendmsg+0x1f2e/0x24c0 [ 36.005005] [] ? ip_reply_glue_bits+0xc0/0xc0 [ 36.011242] [] ? udp6_lib_lookup2+0x990/0x990 [ 36.017380] [] ? ndisc_cleanup+0x40/0x40 [ 36.023081] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 36.029407] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 36.036239] [] ? release_sock+0x3b6/0x500 [ 36.042034] [] ? trace_hardirqs_on+0xd/0x10 [ 36.047991] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 36.054471] [] ? udp_v6_get_port+0xa7/0xd0 [ 36.060343] [] inet_sendmsg+0x203/0x4d0 [ 36.065953] [] ? inet_sendmsg+0x73/0x4d0 [ 36.071655] [] ? inet_recvmsg+0x4c0/0x4c0 [ 36.077436] [] sock_sendmsg+0xcc/0x110 [ 36.082950] [] SYSC_sendto+0x21c/0x370 [ 36.088469] [] ? SYSC_connect+0x300/0x300 [ 36.094250] [] ? __fd_install+0x21a/0x600 [ 36.100036] [] ? compat_SyS_futex+0x1e1/0x2f0 [ 36.106171] [] ? fd_install+0x4d/0x60 [ 36.111611] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 36.118639] [] ? SyS_socket+0x121/0x1b0 [ 36.124251] [] ? move_addr_to_kernel+0x50/0x50 [ 36.130648] [] SyS_sendto+0x40/0x50 [ 36.135914] [] ? SyS_getpeername+0x30/0x30 [ 36.141798] [] do_fast_syscall_32+0x326/0x8b0 [ 36.147928] [] sysenter_flags_fixed+0xd/0x17 [ 36.154662] Dumping ftrace buffer: [ 36.158255] (ftrace buffer empty) [ 36.161943] Kernel Offset: disabled [ 36.165567] Rebooting in 86400 seconds..