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From: Mel <fbsd.questions@rachie.is-a-geek.net>
To: freebsd-questions@freebsd.org
Date: Tue, 18 Nov 2008 05:18:37 +0100
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Cc: Tsu-Fan Cheng <tfcheng@gmail.com>
Subject: Re: pkg_delete core dump
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On Monday 17 November 2008 22:15:32 Tsu-Fan Cheng wrote:
> Hi Mel,
>    thank you for your help, now I recompile pkg_install and run
> pkg_delete again, under print/acroread8 it still coredump. here is the
> result:
>
> # gdb pkg_delete pkg_delete.core
> GNU gdb 6.1.1 [FreeBSD]
> Copyright 2004 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you
> are welcome to change it and/or distribute copies of it under certain
> conditions. Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for details.
> This GDB was configured as "i386-marcel-freebsd"...
> Core was generated by `pkg_delete'.
> Program terminated with signal 11, Segmentation fault.
> Reading symbols from /lib/libmd.so.4...done.
> Loaded symbols for /lib/libmd.so.4
> Reading symbols from /lib/libc.so.7...done.
> Loaded symbols for /lib/libc.so.7
> Reading symbols from /libexec/ld-elf.so.1...done.
> Loaded symbols for /libexec/ld-elf.so.1
> #0  0x2815dae6 in strcmp () from /lib/libc.so.7
> (gdb) bt
> #0  0x2815dae6 in strcmp () from /lib/libc.so.7
> #1  0x0804b50c in isinstalledpkg (name=0x0)
>     at /usr/src/usr.sbin/pkg_install/lib/match.c:374

There's the culprit. strcmp called on a null pointer. The reason is that the 
+CONTENTS file contains corrupted data. Most likely a @pkgdep line without a 
package name. Could you show the output of:
grep @pkgdep /var/db/pkg/acroread8-8.1.2_2/+CONTENTS

-- 
Mel

Problem with today's modular software: they start with the modules
    and never get to the software part.