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[Bug-readline] readline spins up at 100% CPU when put into background fr
From: |
Cook, Rich |
Subject: |
[Bug-readline] readline spins up at 100% CPU when put into background from shell script |
Date: |
Wed, 12 Sep 2012 00:18:12 +0000 |
Hello,
I have a problem which I believe is in readline. The problem shows up in the
readline library, and is in two different programs each of which use readline.
I'm not sure what version of readline we have. I see:
/lib64/libreadline.so.6
and in /usr/include/readline/readline.h:
/* Hex-encoded Readline version number. */
#define RL_READLINE_VERSION 0x0600 /* Readline 6.0 */
#define RL_VERSION_MAJOR 6
#define RL_VERSION_MINOR 0
What happens is the following. I write a wrapper script for, say, gnuplot,
let's make it real simple for analysis' sake. The actual script does more than
this, but this script exhibits the problem I'm having and is very simple:
#!/usr/bin/env bash
/usr/local/tools/gnuplot-4.4.3/bin/gnuplot.real "$@"
Easy peasy! When this script is run, then put into the background with
Control-Z, readline goes "berserk" taking up 100% of a CPU trying to read a
keystroke. A trace trap shows this:
Stack Trace
tcsetattr, FP=7fffffffd060
rl_tty_unset_default_bindings, FP=7fffffffd080
rl_deprep_terminal, FP=7fffffffd090
rl_cleanup_after_signal, FP=7fffffffd0a0
rl_reset_after_signal, FP=7fffffffd140
rl_read_key, FP=7fffffffd160
readline_internal_char, FP=7fffffffd180
readline, FP=7fffffffd190
C read_line, FP=7fffffffd1e0
C com_line, FP=7fffffffd1f0
C main, FP=7fffffffd3e0
__libc_start_main, FP=7fffffffd4a0
_start, FP=7fffffffd4b0
This only happens when gnuplot is backgrounded from a script. If I run gnuplot
binary from the command line directly it does not exhibit this problem.
Can someone on this list comment or suggest steps I could take to solve this?
For now I have a workaround to call
exec /usr/local/tools/gnuplot-4.4.3/bin/gnuplot.real "$@"
But I am using "trap" in my script to get signals and calling exec defeats all
my signal handling traps.
--
✐Richard Cook
✇ Lawrence Livermore National Laboratory
Bldg-453 Rm-4024, Mail Stop L-557
7000 East Avenue, Livermore, CA, 94550, USA
☎ (office) (925) 423-9605
☎ (fax) (925) 423-6961
---
Information Management & Graphics Grp., Services & Development Div., Integrated
Computing & Communications Dept.
(opinions expressed herein are mine and not those of LLNL)
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