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crash when using backquoted commands in $PS4

From: Matias Atria
Subject: crash when using backquoted commands in $PS4
Date: Sun, 6 Jan 2002 18:04:58 -0500 (EST)

Configuration Information [Automatically generated, do not change]:
Machine: i686
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i686' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i686-pc-linux-gnu' 
-I./lib -I/usr/local/include -O2
uname output: Linux silvio 2.4.14 #2 Thu Dec 20 12:14:39 EST 2001 i686 unknown
Machine Type: i686-pc-linux-gnu

Bash Version: 2.03
Patch Level: 0
Release Status: release

When setting PS4 to a backquoted command, bash keeps forking subshells
until it crashes.

$ PS4='`ls`' sh -x -c echo
Segmentation violation
$ PS4='`ls`' sh -x -c echo
[suspended after a couple of seconds with ^Z]
$ ps aux | grep 'sh -x -c echo' | wc -l

PS4='`ls`' sh -x -c echo

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