random crashes when read interrupted by signal & clean up modifies terminal

[Mike Frysinger]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: x86_64-pc-linux-gnu-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./include -I. -I./include -I./lib  -DCPPFLAGS_TEST -
DDEFAULT_PATH_VALUE='/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin'
 
-DSTANDARD_UTILS_PATH='/bin:/usr/bin:/sbin:/usr/sbin' -
DSYS_BASHRC='/etc/bash/bashrc' -DSYS_BASH_LOGOUT='/etc/bash/bash_logout' -
DNON_INTERACTIVE_LOGIN_SHELLS -DSSH_SOURCE_BASHRC -O2 -march=amdfam10 -pipe -g 
-Wimplicit-function-declaration
uname output: Linux vapier 3.7.1 #1 SMP PREEMPT Mon Dec 17 23:01:27 EST 2012 
x86_64 AMD Phenom(tm) II X4 980 Processor AuthenticAMD GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 4.2
Patch Level: 42
Release Status: release

Description:

this simple testcase (distilled from [1]):
$ cat test.sh
#!/bin/bash
cleanup() {
        tput rmcup
        exit 0
}
trap cleanup SIGINT
while ! read -t0.01 -n1; do : ; done

run it in a loop like so:
$ while ./test.sh ; do :; done

then hold down ctrl+c.  eventually it'll crash.

[1] https://455990.bugs.gentoo.org/attachment.cgi?id=338214
-mike

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