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Bug #46830 unexpected termination
Submitted: 2008-12-11 02:57 UTC Modified: 2008-12-11 08:21 UTC
Votes:9
Avg. Score:4.4 ± 0.8
Reproduced:7 of 7 (100.0%)
Same Version:6 (85.7%)
Same OS:6 (85.7%)
From: ncross42 at cyworld dot com Assigned:
Status: Not a bug Package: Apache2 related
PHP Version: 5.2.8 OS: Ubuntu-8.04.1-server
Private report: No CVE-ID: None
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From: ncross42 at cyworld dot com
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 [2008-12-11 02:57 UTC] ncross42 at cyworld dot com 
Description:
------------
This bug is a apache-thread related php excution bug.

This bug is repeatable and clear.

1. System setting.
 a. apache-2.2.10 : mpm=worker and using shared modules.
-=-=-= httpd.conf =-=-=-
for simple test, values are low.
<IfModule worker.c>
StartServers        1
MinSpareThreads     2
MaxSpareThreads     4
ThreadsPerChild     2   # <- this is important.
MaxRequestsPerChild 5   # <- this is important.
</IfModule>

 b. PHP-5.2.8 : using apxs2 and enable-maintainer-zts for threadsafe
(no external cache like APC or XCache)


Reproduce code:
---------------
-=-= code of 1.php =-=-
<?php
 echo '1<br>';

 echo date("H:i:s").'<br>';
sleep(10);
 echo date("H:i:s").'<br>';
?>

-=-= code of 2.php =-=-
<?php
 echo '2<br>';

 echo date("H:i:s").'<br>';
 echo date("H:i:s").'<br>';
?>


Expected result:
----------------
<bug scenario>

 (a) browse 1.php and 2.php <concurrently ONCE>. result are not problem.
-=-= result page of 1.php =-=-
1
11:04:29
11:04:39
-=-= result page of 2.php =-=-
2
11:04:30
11:04:30

 (b) I expected ...
  - browse 1.php and 2.php
  - refresh 2.php over 10 times very fast within 10 sec. (yes, using F5)
  - I expected below normal resuluts.
-=-= result page of 1.php =-=-
1
11:12:47
11:12:49
-=-= result page of 2.php =-=-
2
11:12:49
11:12:49

Actual result:
--------------
<ANALYSIS>

 (a) initial apache process is here
Shell> ps ax | grep httpd
 5697 ?        Ss     0:00 /skcomms/apache/bin/httpd -k restart
 5964 ?        Sl     0:00 /skcomms/apache/bin/httpd -k restart
  - becuase below apache setting
<IfModule worker.c>
StartServers        1
MinSpareThreads     2
ThreadsPerChild     2
...
</IfModule>

 (b) suppose
  - in (a) action, two connection is established with process 5964
  - in (b) action, new 1.php is sleeping in 5964 and 2.php is excuted in other new process because below reason.
<IfModule worker.c>
...
ThreadsPerChild     2
MaxRequestsPerChild 5
</IfModule>

 (c) expected in 1.php excution time (within 10 sec)
 5697 ?        Ss     0:00 /skcomms/apache/bin/httpd -k restart
 5964 ?        Sl     0:00 /skcomms/apache/bin/httpd -k restart (1.php is sleeping here)
 597x ?        Sl     0:00 /skcomms/apache/bin/httpd -k restart (2.php is browsed here)

 (d) but actually 5964 is terminated early in 2 seconds.
 5697 ?        Ss     0:00 /skcomms/apache/bin/httpd -k restart
 5991 ?        Sl     0:00 /skcomms/apache/bin/httpd -k restart

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 [2008-12-11 03:06 UTC] ncross42 at cyworld dot com 
sorry, i don't submitted Actual results.
here is Actual results.
-=-= result page of 1.php =-=-
1
11:49:00
11:49:02
-=-= result page of 2.php =-=-
2
11:49:02
11:49:02
 [2008-12-11 04:24 UTC] ncross42 at cyworld dot com 
sorry again.
There is wrong expected results.
-=-= result page of 1.php =-=-
1
11:12:47
11:12:49  <- this is bug results.
-=-= result page of 2.php =-=-
2
11:12:49
11:12:49


-=-= result page of 1.php =-=-
1
11:12:47
11:12:57  <- I expected like this!! (sleeping 10 sec)
-=-= result page of 2.php =-=-
2
11:12:57  <- this value is meaningless
11:12:57  <- but for fast refresh.
 [2008-12-11 08:21 UTC] ncross42 at cyworld dot com 
I have a reply from Apach maintainer.

"The php manual has comments saying sleep() wakes up when you receive any signal
(like the traditional C library call documents, man 3 sleep)

Termination due to MaxRequestsPerchild is implemented via a signal."

So, this is not a bug. :)
 
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