Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.169' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   28.634731] kasan: CONFIG_KASAN_INLINE enabled
[   28.639507] kasan: GPF could be caused by NULL-ptr deref or user memory access
[   28.647912] general protection fault: 0000 [#1] PREEMPT SMP KASAN
[   28.654259] Modules linked in:
[   28.657542] CPU: 0 PID: 7986 Comm: syz-executor786 Not tainted 4.14.209-syzkaller #0
[   28.665397] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   28.674741] task: ffff8880b187a5c0 task.stack: ffff888095440000
[   28.680781] RIP: 0010:vhost_chr_write_iter+0x863/0x10f0
[   28.686116] RSP: 0018:ffff888095447c00 EFLAGS: 00010246
[   28.691452] RAX: dffffc0000000000 RBX: ffff888091fe0140 RCX: 0000000000000000
[   28.698695] RDX: 0000000000000002 RSI: ffffffff8ba42570 RDI: ffff888091fe0200
[   28.705939] RBP: ffffed10123fc039 R08: 0000000000000000 R09: 0000000000000000
[   28.713182] R10: 0000000000000002 R11: ffff8880b187a5c0 R12: 0000000000000002
[   28.720423] R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff11012a88f87
[   28.727668] FS:  0000000001d1e880(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
[   28.735867] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   28.741737] CR2: 0000000020000080 CR3: 000000009a824000 CR4: 00000000001406f0
[   28.748993] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   28.756239] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   28.763482] Call Trace:
[   28.766051]  ? log_write_hva+0x310/0x310
[   28.770083]  ? debug_check_no_obj_freed+0x2c0/0x674
[   28.775074]  ? lock_downgrade+0x740/0x740
[   28.779207]  ? iov_iter_init+0xa6/0x1c0
[   28.783169]  __vfs_write+0x44c/0x630
[   28.786857]  ? kernel_read+0x110/0x110
[   28.790721]  ? rw_verify_area+0xe1/0x2a0
[   28.794773]  vfs_write+0x17f/0x4d0
[   28.798286]  SyS_write+0xf2/0x210
[   28.801712]  ? SyS_read+0x210/0x210
[   28.806266]  ? __do_page_fault+0x159/0xad0
[   28.810472]  ? do_syscall_64+0x4c/0x640
[   28.814418]  ? SyS_read+0x210/0x210
[   28.818016]  do_syscall_64+0x1d5/0x640
[   28.821884]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[   28.827047] RIP: 0033:0x440279
[   28.830208] RSP: 002b:00007ffe4c56cc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   28.837899] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440279
[   28.845141] RDX: 0000000000000048 RSI: 0000000020000140 RDI: 0000000000000003
[   28.852384] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8
[   28.859625] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a80
[   28.866888] R13: 0000000000401b10 R14: 0000000000000000 R15: 0000000000000000
[   28.874136] 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 
[   28.893198] RIP: vhost_chr_write_iter+0x863/0x10f0 RSP: ffff888095447c00
[   28.900726] ---[ end trace 85fd8fa2b7199851 ]---
[   28.905487] Kernel panic - not syncing: Fatal exception
[   28.911373] Kernel Offset: disabled
[   28.915064] Rebooting in 86400 seconds..