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Bug #5025 Segmentation fault when using deeply nested scripts
Submitted: 2000-06-14 11:29 UTC Modified: 2000-07-23 15:14 UTC
From: mlemos at acm dot org Assigned:
Status: Closed Package: Reproducible Crash
PHP Version: 4.0 Latest CVS (14/06/2000) OS: Linux
Private report: No CVE-ID: None
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From: mlemos at acm dot org
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 [2000-06-14 11:29 UTC] mlemos at acm dot org 
When running a large multi-file script using PHP standalone CGI executable
from the shell, it crashes with segmentation fault after running a long and
deeply nested (but not recursive) script. This also happens with PHP 3.

Running gdb with the latest PHP 4 version, there were 376 stack frames when
the program crashed somewhere in Zend code. I thought it was a stack limit
problem, but then I run ulimit -s unlimit and it still crashed in the same
code. I also set the memory limit to a very high value but with no change.

I have a 800KB strace output file if that helps, but all it is seen before
the crash is a long sequence of brk() calls. If strace or gdb output helps
just mail me back and I'll send the output to an address you want.

Since I am stuck without being able to do anything to work around this
crash, I am willing to open a telnet port so you can login in my machine
when I am online, as my Internet link is not permanent. Just mail me
or better, page me to ICQ UIN 15699174.

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 [2000-06-15 06:23 UTC] mlemos at acm dot org 
Phew, it turned out to be infinite recursion problem.  I was in sympathy
error with my code and I could not figure that it was going through a large
infinite recursion loop.

I don't think there is nothing to fix in PHP except for some mechanisms to
prevent programmers to go crazy with sympathy error due to infinite
recursion like I was.  Infinite recursion problems is programmers fault,
but it would be nice if there was an option that would enforce a an
effective limit to how many time a function may call itself whether
directly or indirectly.

The way it is now, these simple lines make PHP crash with segmentation fault:

<?

Function myfunction()
{
    return(myfunction());
}

echo myfunction();

?>
 [2000-07-23 15:14 UTC] jalal at cvs dot php dot net 
User solved problem by not using infinite recursion.
Recommended practise.
 
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