INIT: Entering runlevel: 2

[info] Using makefile-style concurrent boot in runlevel 2.
[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[....] 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 '10.128.0.17' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   39.761147] WARNING: CPU: 1 PID: 4478 at net/ipv4/tcp_input.c:2191 tcp_mark_head_lost+0x8ee/0xa70
[   39.770236] Kernel panic - not syncing: panic_on_warn set ...
[   39.770236] 
[   39.777581] CPU: 1 PID: 4478 Comm: syzkaller690997 Not tainted 4.17.0-rc1+ #13
[   39.784919] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   39.794249] Call Trace:
[   39.796824]  dump_stack+0x1b9/0x294
[   39.800431]  ? dump_stack_print_info.cold.2+0x52/0x52
[   39.805615]  ? tcp_mark_head_lost+0x7f0/0xa70
[   39.810090]  panic+0x22f/0x4de
[   39.813261]  ? add_taint.cold.5+0x16/0x16
[   39.817389]  ? __warn.cold.8+0x148/0x1b3
[   39.821429]  ? __warn.cold.8+0x117/0x1b3
[   39.825469]  ? tcp_mark_head_lost+0x8ee/0xa70
[   39.829941]  __warn.cold.8+0x163/0x1b3
[   39.833807]  ? tcp_mark_head_lost+0x8ee/0xa70
[   39.838280]  report_bug+0x252/0x2d0
[   39.841888]  do_error_trap+0x1de/0x490
[   39.845756]  ? math_error+0x420/0x420
[   39.849539]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
[   39.855053]  ? tcp_rate_skb_delivered+0x2d0/0x3a0
[   39.859878]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
[   39.865394]  ? tcp_skb_mark_lost_uncond_verify+0x1f2/0x290
[   39.871002]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
[   39.876526]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   39.881349]  do_invalid_op+0x1b/0x20
[   39.885041]  invalid_op+0x14/0x20
[   39.888470] RIP: 0010:tcp_mark_head_lost+0x8ee/0xa70
[   39.893550] RSP: 0018:ffff8801aff6f4d8 EFLAGS: 00010293
[   39.898892] RAX: ffff8801af978640 RBX: 0000000000000004 RCX: ffffffff864a3dfc
[   39.906139] RDX: 0000000000000000 RSI: ffffffff864a3efe RDI: 0000000000000004
[   39.913388] RBP: ffff8801aff6f560 R08: ffff8801af978640 R09: ffff8801aff6f910
[   39.920638] R10: 00000000025eb3c7 R11: ffff88021fff8057 R12: 0000000000000003
[   39.927893] R13: ffff8801aff4b500 R14: dffffc0000000000 R15: 0000000000000001
[   39.935148]  ? tcp_mark_head_lost+0x7ec/0xa70
[   39.939620]  ? tcp_mark_head_lost+0x8ee/0xa70
[   39.944094]  ? tcp_mark_head_lost+0x8ee/0xa70
[   39.948577]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
[   39.954106]  tcp_fastretrans_alert+0x163c/0x2850
[   39.958852]  tcp_ack+0x2c48/0x5510
[   39.962380]  ? tcp_fastretrans_alert+0x2850/0x2850
[   39.967290]  ? skb_scrub_packet+0x580/0x580
[   39.971596]  ? debug_check_no_locks_freed+0x310/0x310
[   39.976770]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   39.982295]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   39.987813]  ? tcp_parse_options+0x1c1/0xe30
[   39.992207]  ? sched_clock_cpu+0x1b/0x180
[   39.996335]  ? __sanitizer_cov_trace_const_cmp1+0x10/0x20
[   40.001851]  tcp_rcv_state_process+0xc60/0x5002
[   40.006506]  ? tcp_finish_connect+0x400/0x400
[   40.010980]  ? print_usage_bug+0xc0/0xc0
[   40.015019]  ? find_held_lock+0x36/0x1c0
[   40.019063]  ? lock_downgrade+0x8e0/0x8e0
[   40.023190]  ? __lock_is_held+0xb5/0x140
[   40.027230]  ? mark_held_locks+0xc9/0x160
[   40.031358]  ? kasan_check_read+0x11/0x20
[   40.035484]  ? __local_bh_enable_ip+0x161/0x230
[   40.040130]  tcp_v4_do_rcv+0x365/0x8c0
[   40.043993]  ? tcp_v4_do_rcv+0x365/0x8c0
[   40.048041]  __release_sock+0x12f/0x3a0
[   40.052000]  release_sock+0xa4/0x2b0
[   40.055695]  ? __release_sock+0x3a0/0x3a0
[   40.059827]  ? __local_bh_enable_ip+0x161/0x230
[   40.064479]  ? tcp_set_state+0x9b0/0x9b0
[   40.068522]  ? tcp_set_state+0x9b0/0x9b0
[   40.072565]  inet_shutdown+0x1f7/0x3d0
[   40.076434]  __sys_shutdown+0x154/0x2b0
[   40.080392]  ? __ia32_sys_getsockopt+0x150/0x150
[   40.085133]  ? __ia32_sys_fallocate+0xf0/0xf0
[   40.089613]  ? do_syscall_64+0x92/0x800
[   40.093566]  __x64_sys_shutdown+0x54/0x80
[   40.097693]  do_syscall_64+0x1b1/0x800
[   40.101563]  ? syscall_return_slowpath+0x5c0/0x5c0
[   40.106481]  ? syscall_return_slowpath+0x30f/0x5c0
[   40.111407]  ? entry_SYSCALL_64_after_hwframe+0x59/0xbe
[   40.116750]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   40.121577]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   40.126743] RIP: 0033:0x440039
[   40.129911] RSP: 002b:00007ffe004b2d98 EFLAGS: 00000217 ORIG_RAX: 0000000000000030
[   40.137603] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440039
[   40.144848] RDX: 0000000000440039 RSI: 0000000000000001 RDI: 0000000000000003
[   40.152102] RBP: 00000000006ca018 R08: 0000000000000010 R09: 0000000000000010
[   40.159349] R10: 0000000000000009 R11: 0000000000000217 R12: 0000000000401960
[   40.166595] R13: 00000000004019f0 R14: 0000000000000000 R15: 0000000000000000
[   40.174381] Dumping ftrace buffer:
[   40.178006]    (ftrace buffer empty)
[   40.181696] Kernel Offset: disabled
[   40.185303] Rebooting in 86400 seconds..