Re: bin/55907: dhcpcd dumps core

[David Holland <dholland-bugs%netbsd.org@localhost>]

The following reply was made to PR bin/55907; it has been noted by GNATS.

From: David Holland <dholland-bugs%netbsd.org@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: bin/55907: dhcpcd dumps core
Date: Sun, 25 Jul 2021 03:21:43 +0000

 On Mon, Jan 04, 2021 at 05:00:01PM +0000, martin%NetBSD.org@localhost wrote:
  > Running "dhcpcd -6" on my ERLITE3 (mips64 with 32bit userland) crashes.
  > Unfortunately gdb is not very helpfull:
  > 
  > (gdb) run -6
  > Starting program: /sbin/dhcpcd -6
  > 
  > Program received signal SIGSEGV, Segmentation fault.
  > 0x785f9f20 in ?? (warning: GDB can't find the start of the function at 0x785f9f20.
 
 It's highly unlikely there's anything there in any mips binary, so
 it's most likely jumped through an uninitialized pointer.
 
 probably the best approach is to binary-search where it crashes :-/
 
 0x785f9f20 becomes a valid instruction if byte-swapped but that
 doesn't seem like a likely source of the bad value...
 
 -- 
 David A. Holland
 dholland%netbsd.org@localhost