Re: kern/53311: boot netbsd -d panics

[christos%zoulas.com@localhost (Christos Zoulas)]

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

From: christos%zoulas.com@localhost (Christos Zoulas)
To: gnats-bugs%NetBSD.org@localhost, kern-bug-people%netbsd.org@localhost, 
	gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost, prlw1%cam.ac.uk@localhost
Cc: 
Subject: Re: kern/53311: boot netbsd -d panics
Date: Sun, 27 May 2018 10:21:05 -0400

 On May 27, 12:10pm, uwe%stderr.spb.ru@localhost (Valery Ushakov) wrote:
 -- Subject: Re: kern/53311: boot netbsd -d panics
 
 | 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: Andreas Gustafsson <gson%gson.org@localhost>
 | Subject: Re: kern/53311: boot netbsd -d panics
 | Date: Sun, 27 May 2018 15:07:16 +0300
 | 
 |  On Sun, May 27, 2018 at 10:40:00 +0000, Andreas Gustafsson wrote:
 |  
 |  >  By bisection, I found that the problem started with the following
 |  >  commit:
 |  >  
 |  >    2018.03.16.04.48.19 ozaki-r src/sys/arch/x86/x86/db_memrw.c 1.6
 |  >  
 |  >  I suggest reverting it (and its pullup).
 |  
 |  This is from March 2018.  The boot -d + bt triple fault that I
 |  reported above is on i386 with 8.99.12 from late January 2018.  So
 |  that's probably not the whole story.
 
 Indeed, but perhaps a simple way to avoid it right now is:
 
 
 Index: db_memrw.c
 ===================================================================
 RCS file: /cvsroot/src/sys/arch/x86/x86/db_memrw.c,v
 retrieving revision 1.6
 diff -u -p -u -r1.6 db_memrw.c
 --- db_memrw.c  16 Mar 2018 04:48:19 -0000      1.6
 +++ db_memrw.c  27 May 2018 14:20:00 -0000
 @@ -70,6 +70,9 @@ db_validate_address(vaddr_t addr)
         struct proc *p = curproc;
         struct pmap *pmap;
  
 +       if (cold)
 +               return true;
 +
         if (!p || !p->p_vmspace || !p->p_vmspace->vm_map.pmap ||
             addr >= VM_MIN_KERNEL_ADDRESS
            )