"exit" doesn't work from inside of PIPED read block

[Blaine Simpson]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc -I/usr/src/packages/BUILD/bash-3.2 
-L/usr/src/packages/BUILD/bash-3.2/../readline-5.2
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-suse-linux-gnu' 
-DCONF_VENDOR='suse' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL 
-DHAVE_CONFIG_H   -I.  -I. -I./include -I./lib   -O2 -fmessage-length=0 -Wall 
-D_FORTIFY_SOURCE=2 -fstack-protector -g -D_GNU_SOURCE -DRECYCLES_PIDS -Wall 
-pipe -g -fPIE -fprofile-use
uname output: Linux beyla 2.6.22.12-0.1-default #1 SMP 2007/11/06 23:05:18 UTC 
x86_64 x86_64 x86_64 GNU/Linux
Machine Type: x86_64-suse-linux-gnu

Bash Version: 3.2
Patch Level: 25
Release Status: release

Description:
        "exit" doesn't exit the current shell when inside of PIPED read blocks,
    yet everything works find if the input comes from "redirection".

Repeat-By:
    cat /tmp/atf | while read; do exit 3; done  # for any text file /tmp/atf
    Yet the following works
    cat /tmp/atf | while read; do exit 3; done