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Date: Thu, 13 Oct 2011 14:02:20 -0400
Message-ID: <CAG_2cTmn8+ZQSyu2YAxW2vLJQ+MF-xuXw11sZen6otTCaKvyKw@mail.gmail.com>
Subject: Re: /proc/*/cmdline corrupted
From: Jon Clugston <jon DOT clugston AT gmail DOT com>
To: cygwin AT cygwin DOT com
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On Wed, Oct 12, 2011 at 11:07 AM, Jon Clugston <jon DOT clugston AT gmail DOT com> wrote:
> Greetings,
>
> When I run "procps -ef" I get corrupted command line parameters:
>
> jc807j@~>procps -ef
> UID        PID  PPID  C STIME TTY          TIME CMD
> jc807j    5852     1  0 08:59 tty0     00:00:03 X :0 -multiwindow
> jc807j    2668     1  0 08:59 tty0     00:00:00 xterm -e ssh server
> 80x72+285+0 -e ssh server
> jc807j    3004     1  0 08:59 tty0     00:00:00 xterm -e ssh server
> 80x72-8+0 -e ssh server
> jc807j    3392  3004  0 08:59 tty0     00:00:00 ssh server
> jc807j    5960  2668  0 08:59 tty1     00:00:00 ssh server
> jc807j    2928  5852  0 09:12 ?        00:00:00 xterm  20000 +tb
> jc807j    4608  2928  0 09:12 tty2     00:00:00 bash
> jc807j    5800  4608  1 10:57 tty2     00:00:00 procps -ef
>
> The actual command lines for the 3 xterm processes are:
>
> C:\cygwin\bin\xterm.exe -sl 20000 +tb -geometry 80x72+285+0 -e ssh server
> C:\cygwin\bin\xterm.exe -sl 20000 +tb -geometry 80x72-8+0 -e ssh server
> C:\cygwin\bin\xterm.exe -sl 20000 +tb
>
> as reported by the "listdlls" tool.
>
> I have verified that the "/proc/*/cmdline" is the source of the
> corrupted information.  "cmdline" from PID 2928 is:
>
> jc807j@~>od -c /proc/2928/cmdline
> 0000000   x   t   e   r   m  \0  \0   2   0   0   0   0  \0   +   t   b
> 0000020  \0
> 0000021
>

I am able to reproduce the problem by simply executing the following
command line:

xterm -sl 20000 +tb -geometry 80x72+285+0 -e ssh server

(obviously w/ X running).  I wrote a simple shell script which does
nothing except sleep and I called it with the same command line
parameters and it didn't have the problem.  So, it appears that the
problem is related to "xterm" or something that "xterm" does.

I also shortened/simplified the command line (to "xterm") and it was
still corrupted (the "-sl" was missing):

xterm -sl 20000 +tb -geometry 80x72+285+0

I tried to reproduce by creating long command lines to other commands
and none were corrupted.

Does "xterm" step on its command line?

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