Re: kern/52676: Kernel assert "pmap->pm_obj[i].uo_npages == 0" on 8.99.3 [syzkaller]

To: gnats-bugs%netbsd.org@localhost
Subject: Re: kern/52676: Kernel assert "pmap->pm_obj[i].uo_npages == 0" on 8.99.3 [syzkaller]
From: Utkarsh Anand <uanand009%gmail.com@localhost>
Date: Tue, 31 Oct 2017 08:15:06 +0530

I reproduced the result on Virtualbox using the same image that Dmitry is using.
You can access some important information from:
http://ftp.netbsd.org/pub/NetBSD/misc/utkarsh009/syzkaller/NetBSD_crash.tar.gz
After crashing 2-3 times, it completely crippled the VM and it
couldn't even boot.

Interestingly, it doesn't crash this VM:
utkarsh# uname -a
NetBSD utkarsh.localhost 7.99.71 NetBSD 7.99.71 (XEN3_DOM0) #1: Sat
Jun 10 13:41:43 IST 2017
root@utkarsh-GP62-6QE:/extra/obj/sys/arch/amd64/compile/XEN3_DOM0
amd64
Regards,
Utkarsh Anand

References:
- kern/52676: Kernel assert "pmap->pm_obj[i].uo_npages == 0" on 8.99.3 [syzkaller]
  - From: n54

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