The following reply was made to PR kern/30143; it has been noted by GNATS.

From: Chuck Silvers <chuq@chuq.com>
To: "Nathan J. Williams" <nathanw@wasabisystems.com>
Cc: gnats-bugs@netbsd.org
Subject: Re: bin/30143: gdb does not work with threaded programs
Date: Fri, 6 May 2005 09:08:23 -0700

 On Thu, May 05, 2005 at 09:41:05PM -0400, Nathan J. Williams wrote:
 > 
 > This is a problem in the core-dumping code. Specifically, a region
 > without read permission but otherwise dumpable will generate EFAULT
 > when coredump_writesegs() tries to write it out. The following program
 > will demonstrate this, without libpthread linked in:
 ...
 > The following patch to uvm_glue.c seems to fix this by adding read
 > permission if it's not there already. There might be a better way to
 > do this, or it might be better to mark unreadable regions as
 > undumpable.
 
 I'd rather skip the unreadable regions.  if a chunk of address space
 isn't readable by the process it shouldn't be readable by the
 coredump code either.
 
 -Chuck