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Bug #33909 fread of a pipe hang after opening a pipe with a < entry
Submitted: 2005-07-28 18:55 UTC Modified: 2008-07-21 01:00 UTC
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: phil at adigital dot com dot mx Assigned:
Status: No Feedback Package: Program Execution
PHP Version: 5CVS-2005-07-29 OS: *
Private report: No CVE-ID: None
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From: phil at adigital dot com dot mx
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 [2005-07-28 18:55 UTC] phil at adigital dot com dot mx
Opening a pipe for read , for example for a cgi (in this example) will block on the fread AFTER a call to a call with an entry file

I got the error on Windows, Linux, from PHP 5.0.2, PHP 5.0.4, PHP5.1 on CVS (did not try on other versions either)

For example:
Call 1: popen("/usr/bin/php5"); with SCRIPT_FILENAME=info.php    WORKS perfectly, and is repeatible X times

Call 2: popen("/usr/bin/php5"); with SCRIPT_FILENAME=info.php<tempfile    WORKS perfectly... BUT

Call 3: after the call 2
popen("/usr/bin/php5"); with SCRIPT_FILENAME=info.php    WILL HANG AND TOTALLY BLOCK but without using CPU time.

compile: compiled downloaded version on windows, 
natural php.ini without modifications
On linux: compiled as CLI, CGI, no more options than mysql

The bug do not depends on what is compiled with php


Reproduce code:
For linux code example :
For windows code example :

Expected result:
i expect the code does not hang...

Actual result:
 no backtrace, the running code hang


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 [2008-07-21 01:00 UTC] php-bugs at lists dot php dot net
No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".
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