INIT: Entering runlevel: 2 [[36minfo[39;49m] Using makefile-style concurrent boot in runlevel 2. [....] 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[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added 'ci-android-49-kasan-gce-1,10.128.0.17' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 46.947472] ------------[ cut here ]------------ [ 46.948238] WARNING: CPU: 0 PID: 3287 at net/core/dev.c:2465 skb_warn_bad_offload+0x2af/0x390 [ 46.949437] lo: caps=(0x000000a2803b7c69, 0x0000000000000000) len=2105 data_len=2043 gso_size=1992 gso_type=2 ip_summed=0 [ 46.950897] Kernel panic - not syncing: panic_on_warn set ... [ 46.950897] [ 46.951861] CPU: 0 PID: 3287 Comm: syzkaller501540 Not tainted 4.9.67-gf26d3c7 #106 [ 46.952876] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.954134] ffff8801cbf96ed8 ffffffff81d906e9 ffffffff83a46d00 ffff8801cbf96fb0 [ 46.955276] ffffffff83ee0b00 ffffffff82f2c24f 0000000000000009 ffff8801cbf96fa0 [ 46.956444] ffffffff8142c411 0000000041b58ab3 ffffffff84186cc0 ffffffff8142c255 [ 46.957612] Call Trace: [ 46.957965] [] dump_stack+0xc1/0x128 [ 46.958673] [] ? skb_warn_bad_offload+0x2af/0x390 [ 46.959536] [] panic+0x1bc/0x3a8 [ 46.960210] [] ? percpu_up_read_preempt_enable.constprop.54+0xd7/0xd7 [ 46.961317] [] ? vprintk_emit+0x3ad/0x750 [ 46.962078] [] ? skb_warn_bad_offload+0x2af/0x390 [ 46.963040] [] __warn+0x1c4/0x1e0 [ 46.963733] [] warn_slowpath_fmt+0xc4/0x110 [ 46.964559] [] ? __warn+0x1e0/0x1e0 [ 46.965271] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 46.966179] [] ? ___ratelimit+0x53/0x460 [ 46.966931] [] skb_warn_bad_offload+0x2af/0x390 [ 46.968917] [] __skb_gso_segment+0x52b/0x670 [ 46.974939] [] validate_xmit_skb+0x44e/0x980 [ 46.980960] [] ? check_preemption_disabled+0x3b/0x200 [ 46.987761] [] ? check_preemption_disabled+0x3b/0x200 [ 46.994563] [] __dev_queue_xmit+0xa17/0x1e60 [ 47.000584] [] ? __dev_queue_xmit+0x1d4/0x1e60 [ 47.006778] [] ? netdev_pick_tx+0x300/0x300 [ 47.012714] [] ? memcpy+0x45/0x50 [ 47.017780] [] dev_queue_xmit+0x17/0x20 [ 47.023370] [] neigh_resolve_output+0x469/0x770 [ 47.029653] [] ? ip6_finish_output2+0x930/0x1d20 [ 47.036025] [] ? eth_mac_addr+0x1a0/0x1a0 [ 47.041787] [] ip6_finish_output2+0x930/0x1d20 [ 47.047982] [] ? ip6_finish_output2+0x175/0x1d20 [ 47.054350] [] ? ip6_sk_dst_lookup_flow+0x590/0x590 [ 47.060979] [] ? check_preemption_disabled+0x3b/0x200 [ 47.067797] [] ? ip6_mtu+0x209/0x340 [ 47.073128] [] ip6_finish_output+0x2e6/0x750 [ 47.079332] [] ip6_output+0x1f3/0x6a0 [ 47.084748] [] ? ip6_output+0x40c/0x6a0 [ 47.090332] [] ? ip6_finish_output+0x750/0x750 [ 47.096530] [] ? ip6_fragment+0x3390/0x3390 [ 47.102469] [] ip6_local_out+0x95/0x170 [ 47.108057] [] ? ip_reply_glue_bits+0xb0/0xb0 [ 47.114167] [] ip6_send_skb+0xa1/0x340 [ 47.119674] [] udp_v6_send_skb+0x301/0xeb0 [ 47.125523] [] udp_v6_push_pending_frames+0x22f/0x340 [ 47.132335] [] ? udpv6_destroy_sock+0xd0/0xd0 [ 47.138444] [] ? ip_reply_glue_bits+0xb0/0xb0 [ 47.144550] [] udpv6_sendmsg+0x1f38/0x2540 [ 47.150397] [] ? ip_reply_glue_bits+0xb0/0xb0 [ 47.156508] [] ? udp_v6_rehash+0xa0/0xa0 [ 47.162189] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 47.169165] [] ? sock_has_perm+0x1c2/0x3e0 [ 47.175011] [] ? sock_has_perm+0x292/0x3e0 [ 47.180855] [] ? sock_has_perm+0x9f/0x3e0 [ 47.186617] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 47.193680] [] ? check_preemption_disabled+0x3b/0x200 [ 47.200481] [] ? inet_sendmsg+0x201/0x4c0 [ 47.206240] [] inet_sendmsg+0x2bc/0x4c0 [ 47.211827] [] ? inet_sendmsg+0x73/0x4c0 [ 47.217500] [] ? inet_recvmsg+0x4c0/0x4c0 [ 47.223262] [] sock_sendmsg+0xca/0x110 [ 47.228763] [] ___sys_sendmsg+0x6d1/0x7e0 [ 47.234875] [] ? copy_msghdr_from_user+0x550/0x550 [ 47.241428] [] ? __lru_cache_add+0x187/0x250 [ 47.247461] [] ? lru_cache_add+0xd9/0x1e0 [ 47.253229] [] ? handle_mm_fault+0xb12/0x2530 [ 47.259342] [] ? __pmd_alloc+0x410/0x410 [ 47.265016] [] ? __fget_light+0x158/0x1e0 [ 47.270783] [] ? __fdget+0x18/0x20 [ 47.275957] [] __sys_sendmsg+0xd6/0x190 [ 47.281542] [] ? SyS_shutdown+0x1b0/0x1b0 [ 47.287305] [] ? __do_page_fault+0x5ec/0xd40 [ 47.293325] [] ? __do_page_fault+0x3bd/0xd40 [ 47.299345] [] ? SyS_setsockopt+0x17f/0x250 [ 47.305280] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 47.312079] [] SyS_sendmsg+0x2d/0x50 [ 47.317408] [] entry_SYSCALL_64_fastpath+0x23/0xc6 [ 47.324421] Dumping ftrace buffer: [ 47.327948] (ftrace buffer empty) [ 47.331622] Kernel Offset: disabled [ 47.335222] Rebooting in 86400 seconds..