Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.2' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   28.770351] kasan: CONFIG_KASAN_INLINE enabled
[   28.775022] kasan: GPF could be caused by NULL-ptr deref or user memory access
[   28.783516] general protection fault: 0000 [#1] PREEMPT SMP KASAN
[   28.789746] Modules linked in:
[   28.792922] CPU: 0 PID: 7988 Comm: syz-executor414 Not tainted 4.14.209-syzkaller #0
[   28.800948] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   28.810283] task: ffff8880b3f1e240 task.stack: ffff8880b32f0000
[   28.816326] RIP: 0010:vhost_chr_write_iter+0x863/0x10f0
[   28.821656] RSP: 0018:ffff8880b32f7c00 EFLAGS: 00010246
[   28.826989] RAX: dffffc0000000000 RBX: ffff8880a0580140 RCX: 0000000000000000
[   28.834230] RDX: 0000000000000002 RSI: ffffffff8ba42ee0 RDI: ffff8880a0580200
[   28.841470] RBP: ffffed10140b0039 R08: 0000000000000000 R09: 0000000000000000
[   28.848726] R10: 0000000000000002 R11: ffff8880b3f1e240 R12: 0000000000000002
[   28.855970] R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff1101665ef87
[   28.863211] FS:  0000000001236880(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
[   28.871409] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   28.877273] CR2: 00007fa8f74d2000 CR3: 00000000a9261000 CR4: 00000000001406f0
[   28.884529] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   28.891772] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   28.899013] Call Trace:
[   28.901579]  ? log_write_hva+0x310/0x310
[   28.905627]  ? debug_check_no_obj_freed+0x2c0/0x674
[   28.910629]  ? lock_downgrade+0x740/0x740
[   28.914752]  ? iov_iter_init+0xa6/0x1c0
[   28.918701]  __vfs_write+0x44c/0x630
[   28.922400]  ? kernel_read+0x110/0x110
[   28.926262]  ? rw_verify_area+0xe1/0x2a0
[   28.930295]  vfs_write+0x17f/0x4d0
[   28.933809]  SyS_write+0xf2/0x210
[   28.937258]  ? SyS_read+0x210/0x210
[   28.940872]  ? __do_page_fault+0x159/0xad0
[   28.945080]  ? do_syscall_64+0x4c/0x640
[   28.949026]  ? SyS_read+0x210/0x210
[   28.952636]  do_syscall_64+0x1d5/0x640
[   28.956512]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[   28.961674] RIP: 0033:0x440279
[   28.964836] RSP: 002b:00007ffdad057988 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   28.972527] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440279
[   28.979769] RDX: 0000000000000048 RSI: 0000000020000140 RDI: 0000000000000003
[   28.988496] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8
[   28.995758] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a80
[   29.003018] R13: 0000000000401b10 R14: 0000000000000000 R15: 0000000000000000
[   29.010279] 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 
[   29.029607] RIP: vhost_chr_write_iter+0x863/0x10f0 RSP: ffff8880b32f7c00
[   29.044088] ---[ end trace 0d00bee2f3bed517 ]---
[   29.049129] Kernel panic - not syncing: Fatal exception
[   29.054992] Kernel Offset: disabled
[   29.058617] Rebooting in 86400 seconds..