Re: kern/53311: boot netbsd -d panics

[Valery Ushakov <uwe%stderr.spb.ru@localhost>]

The following reply was made to PR kern/53311; it has been noted by GNATS.

From: Valery Ushakov <uwe%stderr.spb.ru@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: kern/53311: boot netbsd -d panics
Date: Fri, 25 May 2018 17:37:44 +0300

 On Thu, May 24, 2018 at 13:00:00 +0000, prlw1%cam.ac.uk@localhost wrote:
 
 > boot netbsd -d
 
 I think this is caused by the automatic bt that is now performed when
 entering ddb.  I have a current'ish VM with a kernel from late January
 that is before that change.  I can boot -d and get to the ddb prompt
 and continue to the normal boot.  But if at that ddb prompt I do bt, i
 get triple fault.
 
 Under VirtualBox with --debug - when the machine is sitting at that
 ddb prompt the EBP is c1516be4, when it triple faults esp=c1512fc0
 ebp=c15130dc, so it looks like bt runs out of kernel stack in an
 unbound recursion.
 
 -uwe