Linux 对话框在中断会话中消耗 100% CPU

Question

例如，当我通过 ssh（Windows 中的 PuTTY）使用 /usr/bin/dialog 时：

dialog --ok-label Select --cancel-label Cancel --stdout --backtitle BACKTITLE --menu TITLE 0 50 0 '1' 'alfa' '2' 'beta'

当显示对话框时，我通过 Alt-F4（或鼠标单击 X）关闭我的 putty 对话框进程不退出但存在并获得 100% CPU：

PID  USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
9928 user      20   0  113m 2308 1092 R 100.0  0.0   0:30.99 dialog

下面是我的 gdb 会话：

$ gdb -p 9928
GNU gdb (GDB) Red Hat Enterprise Linux (7.2-56.el6)
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Attaching to process 9928
Reading symbols from /usr/bin/dialog...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libdialog.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib64/libdialog.so.6
Reading symbols from /lib64/libncursesw.so.5...(no debugging symbols found)...done.
Loaded symbols for /lib64/libncursesw.so.5
Reading symbols from /lib64/libm.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib64/libm.so.6
Reading symbols from /lib64/libc.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib64/libc.so.6
Reading symbols from /lib64/libtinfo.so.5...(no debugging symbols found)...done.
Loaded symbols for /lib64/libtinfo.so.5
Reading symbols from /lib64/libdl.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/libdl.so.2
Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
Reading symbols from /usr/lib64/gconv/ISO8859-2.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib64/gconv/ISO8859-2.so
0x00007f902081e315 in fcntl () from /lib64/libc.so.6
Missing separate debuginfos, use: debuginfo-install dialog-1.1-9.20080819.1.el6.x86_64
(gdb) bt
#0  0x00007f902081e315 in fcntl () from /lib64/libc.so.6
#1  0x00007f9020fa3b5d in ?? () from /usr/lib64/libdialog.so.6
#2  0x00007f9020fa4230 in dlg_getc () from /usr/lib64/libdialog.so.6
#3  0x00007f9020fa15a3 in ?? () from /usr/lib64/libdialog.so.6
#4  0x00007f9020fa0668 in dlg_menu () from /usr/lib64/libdialog.so.6
#5  0x00007f9020fa131c in dialog_menu () from /usr/lib64/libdialog.so.6
#6  0x0000000000403916 in ?? ()
#7  0x000000000040415c in ?? ()
#8  0x00007f9020761cdd in __libc_start_main () from /lib64/libc.so.6
(gdb) continue
Continuing.
^C
Program received signal SIGINT, Interrupt.
0x00007f902081de00 in __read_nocancel () from /lib64/libc.so.6
(gdb) bt
#0  0x00007f902081de00 in __read_nocancel () from /lib64/libc.so.6
#1  0x00007f9020d6a277 in _nc_wgetch () from /lib64/libncursesw.so.5
#2  0x00007f9020d7f430 in wget_wch () from /lib64/libncursesw.so.5
#3  0x00007f9020fa401f in dlg_getc () from /usr/lib64/libdialog.so.6
#4  0x00007f9020fa15a3 in ?? () from /usr/lib64/libdialog.so.6
#5  0x00007f9020fa0668 in dlg_menu () from /usr/lib64/libdialog.so.6
#6  0x00007f9020fa131c in dialog_menu () from /usr/lib64/libdialog.so.6
#7  0x0000000000403916 in ?? ()
#8  0x000000000040415c in ?? ()
#9  0x00007f9020761cdd in __libc_start_main () from /lib64/libc.so.6

任何想法我应该怎么做？现在我在 cron 中有一个任务，它可以找到旧对话框并杀死它们。

Answer 1

给定的版本1.1-20080819 是旧版本。例如在2009/02/22 中修复了一个相关问题：

修改 dlg_result_key() 以将 curses ERR 映射到对话框的错误退出 （改编自 Domagoj Pensa 的补丁）。

这反过来又是对 2007/07/04 中所做更改的改进：

当从 wgetch() 返回 ERR 时添加一个检查，以确保 输入/输出流仍然有效。如果发生这种情况，强制 返回 ESC，退出对话框（Reiner Huober 报告）。

目前，当前版本为1.2-20150225。

Answer 2

编译最新的dialog 解决了我的问题。 我有 1.1-20080819 对话框版本，而现在我有 1.2-20140911 问题已解决。
@ThomasDickey 感谢您的建议。