#! /bin/sh -e

if [ $# -eq 3 -a "$2" = '-d' ]; then
    pdir="-d $3"
elif [ $# -ne 1 ]; then
    echo >&2 "`basename $0`: script expects -patch|-unpatch as argument"
    exit 1
fi
case "$1" in
    -patch) patch $pdir -f --no-backup-if-mismatch -p1 < $0;;
    -unpatch) patch $pdir -f --no-backup-if-mismatch -R -p1 < $0;;
    *)
	echo >&2 "`basename $0`: script expects -patch|-unpatch as argument"
	exit 1
esac
exit 0

# DP: <your description>
Andreas Schwab <schwab@linux-m68k.org> writes:

> $ declare -A a=b; unset a
> *** glibc detected *** /bin/bash: free(): invalid pointer: 0x10091644 ***

And the obvious patch:

--- bash-4.1/builtins/declare.def.~1~	2009-11-26 01:42:00.000000000 +0100
+++ bash-4.1/builtins/declare.def	2010-04-09 19:20:51.000000000 +0200
@@ -512,7 +512,7 @@ declare_internal (list, local_var)
 	    {
 	      /* let bind_{array,assoc}_variable take care of this. */
 	      if (assoc_p (var))
-		bind_assoc_variable (var, name, "0", value, aflags);
+		bind_assoc_variable (var, name, savestring ("0"), value, aflags);
 	      else
 		bind_array_variable (name, 0, value, aflags);
 	    }