ID: 44994
Updated by: garre...@php.net
Reported By: dbarrett at vistaprint dot com
Status: Assigned
Bug Type: Program Execution
Operating System: win32 only - 2003 Server, 64-bit
PHP Version: 5.2.6
Assigned To: garretts
New Comment:
I've seen this happen in other languages too.
This happens when the pipe between the parent and child fills up, and
cmd.exe ends up blocking and creates a race condition. (Windows script
host languages trip up on this quickly)
in popen_ex() ( in tsrm_win32.c) the pipe is creates with a 2k buffer:
if (!str_len || !CreatePipe(&in, &out, &security, 2048L)) {
this should probably be significantly larger. I'd certainly go with at
least 16k or 32k. (hey, it's only memory :D)
as well, the elimination of the unrequired cmd.exe as the immediate
child process would eliminate the possibility that *it's* buffer gets
overwhelmed too. (which solves bug #43327, and I've passed a patch to
Pierre for that.)
Previous Comments:
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[2009-06-08 16:40:15] alex at bartl dot net
Reproducable with PHP 5.2.9-1 on Windows2003 Server with Apache2.2
Workaround with calling session_write_close() before calling exec()
confirmed working
NOT reproducable with PHP 5.2.1 on Windows 2000 Server with IIS5
anyway, seems to be a duplicate of Bug#44942
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[2009-05-04 14:56:29] mk1992 at hotmail dot com
same problem here, php 5.2.9, w2k3, IIS: shell_exec hanging on
production server but not on development server. Can't do downgrade to
5.1.x.
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[2009-04-28 22:52:53] diackne at gmail dot com
I have the same issue in windows 2008 web server iis 7 !!!
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[2009-04-22 02:03:38] aliks0905 at gmail dot com
I have the same issue as well. I use the exec() function to
simultaneously upload files and sometimes cmd.exe freezes and all
following uploads fail.
I run on a Windows 2003 Server using Apache 2.2.11 and PHP 5.2.9
Looking forward to hearing a solution.
------------------------------------------------------------------------
[2009-02-27 18:58:20] alex at alexi dot ch
Hi all,
I can fully confirm the above behaviour on the Windows platform. We are
using Apache FOP to create PDF-Files out of PHP, so we are invoking
exec() to start the command line FOP processor.
With several versions of PHP 5.2.x (5.2.4, 5.2.6, 5.2.8), this problem
occurs soon as more than one user is invoking the exec().
Luckily we could not reproduce this behaviour using PHP 5.1.x, so
downgrading to a 5.1.x version might also be an option for you.
Regards
alex
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