Command-line char insertion segfault

[Carlo Milanesi]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu' 
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' 
-DSHELL -DHAVE_CONFIG_H   -I.  -I../. -I.././include -I.././lib 
-D_FORTIFY_SOURCE=2 -g -O2 -fstack-protector --param=ssp-buffer-size=4 
-Wformat -Werror=format-security -Wall
uname output: Linux SZ30 3.16.0-38-generic #52~14.04.1-Ubuntu SMP Fri 
May 8 09:43:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 4.3
Patch Level: 11
Release Status: release

Description:
        Every time I insert a character in a command-line in a position
        followed by some characters and some blanks, Bash crashes.

Repeat-By:
        In a new command line, if I type the following 4 keys:
        [a][SPACE][HOME][s]
        the Bash process terminates printing "Segmentation fault".
        This happens both in a Gnome terminal window, and in
        a text-mode screen.