Re: bin/49979: gdb does not work properly on NetBSD-6.1.1/i386

[Darren Reed <darrenr%netbsd.org@localhost>]

On 17/06/2015 4:40 PM, David Holland wrote:
> The following reply was made to PR bin/49979; it has been noted by GNATS.
> 
> From: David Holland <dholland-bugs%netbsd.org@localhost>
> To: gnats-bugs%NetBSD.org@localhost
> Cc: 
> Subject: Re: bin/49979: gdb does not work properly on NetBSD-6.1.1/i386
> Date: Wed, 17 Jun 2015 06:38:01 +0000
> 
>  On Tue, Jun 16, 2015 at 12:00:01PM +0000, darrenr%netbsd.org@localhost wrote:
>   > >Synopsis:       gdb does not work properly on NetBSD-6.1.1/i386
>                                                                 ^^^^
>   > Architecture: x86_64
>   > Machine: amd64
>              ^^^^^^^^^^^
>  
>  to confirm, you do mean 32-bit i386 and the amd64 is just because you
>  filed the PR from another machine?

Correct.

>   > Whilst using gdb to step through a problem and debug an application,
>   > it randomly stops working. e.g.:
>   > (gdb) run -O -d -r test.cap ip
>   > Starting program: /home/darrenr/tcpdump-4.7.4/tcpdump -O -d -r test.cap ip
>   > reading from file test.cap, link-type EN10MB (Ethernet)
>   > 
>   > Breakpoint 1, flatten_bpfprog (start=0xbfbfebe4) at ./optimize.c:2276
>   > 2276            flen = start->bf_len;
>   > (gdb) n
>   > 2277            for (slen = 0, fp = start->bf_insns; flen > 0; flen--, fp++)
>   > (gdb)
>   > 2278                    slen += BPFX_WORDS(fp->code);
>   > (gdb)
>   > 0x081d17f3 in ?? ()
>   > netbsd: {790} file tcpdump
>   > tcpdump: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), statically linked, for NetBSD 6.1.1, not stripped
>   > >How-To-Repeat:
>   > Use gdb to debug program.
>  
>  I take it it's not repeatable in the ordinary sense? How often does it
>  happen? Are the symptoms more or less the same each time? Is it
>  correlated with anything that you've observed?

100% repeatable.