Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.102' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   31.410059] kasan: CONFIG_KASAN_INLINE enabled
[   31.414709] kasan: GPF could be caused by NULL-ptr deref or user memory access
[   31.422931] general protection fault: 0000 [#1] PREEMPT SMP KASAN
[   31.429205] Modules linked in:
[   31.432379] CPU: 0 PID: 7981 Comm: syz-executor521 Not tainted 4.14.202-syzkaller #0
[   31.440299] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   31.449672] task: ffff888095aca640 task.stack: ffff8880b3028000
[   31.455711] RIP: 0010:vhost_chr_write_iter+0x863/0x10f0
[   31.461045] RSP: 0018:ffff8880b302fc00 EFLAGS: 00010246
[   31.466384] RAX: dffffc0000000000 RBX: ffff8880919a0140 RCX: 0000000000000000
[   31.473650] RDX: 0000000000000002 RSI: ffffffff8ba432d0 RDI: ffff8880919a0200
[   31.480909] RBP: ffffed1012334039 R08: 0000000000000000 R09: 0000000000000000
[   31.488153] R10: 0000000000000002 R11: ffff888095aca640 R12: 0000000000000002
[   31.495399] R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff11016605f87
[   31.502645] FS:  00000000019ea880(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
[   31.510951] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   31.516807] CR2: 0000000020000040 CR3: 0000000099042000 CR4: 00000000001406f0
[   31.524080] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   31.531328] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   31.538572] Call Trace:
[   31.541139]  ? log_write_hva+0x310/0x310
[   31.545196]  ? debug_check_no_obj_freed+0x2c0/0x674
[   31.550193]  ? lock_downgrade+0x740/0x740
[   31.554316]  ? iov_iter_init+0xa6/0x1c0
[   31.558267]  __vfs_write+0x44c/0x630
[   31.561973]  ? kernel_read+0x110/0x110
[   31.565851]  ? rw_verify_area+0xe1/0x2a0
[   31.569887]  vfs_write+0x17f/0x4d0
[   31.573402]  SyS_write+0xf2/0x210
[   31.576834]  ? SyS_read+0x210/0x210
[   31.580435]  ? __do_page_fault+0x159/0xad0
[   31.584648]  ? do_syscall_64+0x4c/0x640
[   31.588596]  ? SyS_read+0x210/0x210
[   31.592198]  do_syscall_64+0x1d5/0x640
[   31.596067]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[   31.601232] RIP: 0033:0x440279
[   31.604396] RSP: 002b:00007fff8a42b0b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   31.612097] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440279
[   31.619353] RDX: 0000000000000048 RSI: 0000000020000200 RDI: 0000000000000003
[   31.626704] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8
[   31.633947] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a80
[   31.641191] R13: 0000000000401b10 R14: 0000000000000000 R15: 0000000000000000
[   31.648457] Code: ff df 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 cd 06 00 00 4c 8b ab c0 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e9 48 c1 e9 03 <80> 3c 01 00 0f 85 96 06 00 00 49 8b 6d 00 48 85 ed 0f 84 e4 03 
[   31.667520] RIP: vhost_chr_write_iter+0x863/0x10f0 RSP: ffff8880b302fc00
[   31.674945] ---[ end trace e4daad2aa6af45b6 ]---
[   31.679710] Kernel panic - not syncing: Fatal exception
[   31.685807] Kernel Offset: disabled
[   31.689556] Rebooting in 86400 seconds..