Malloc error during auto-completion

[rss]

Configuration Information [Automatically generated, do not change]:
Machine: sparc
OS: solaris2.8
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='sparc' 
-DCONF_OSTYPE='solaris2.8' -DCONF_MACHTYPE='sparc-sun-solaris2.8' 
-DCONF_VENDOR='sun' -DSHELL -DHAVE_CONFIG_H -DSunOS5   -I.  -I. -I./include 
-I./lib -I/usr/local/include -g -O2
uname output: SunOS akira 5.8 Generic_108528-12 sun4u sparc SUNW,Ultra-60
Machine Type: sparc-sun-solaris2.5.1

Bash Version: 2.05a
Patch Level: 0
Release Status: release

Description:
        During auto-completion I see this:

        malloc: variables.c:1886: assertion botched
        free: underflow detected; mh_nbytes out of range
        last command: exec /usr/bin/bash
        Stopping myself...


Repeat-By:
        It appears that merely running the compgen command
        is sufficient to make this happen.  I see the bash
        process grow it's RSS size at an alarming rate until
        I kill it.

        If I re-compile with GNU malloc, the error text isn't
        as verbose but the behavior is the same.