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Bug #9827 Floating point exception when starting apache
Submitted: 2001-03-18 21:43 UTC Modified: 2001-10-20 23:06 UTC
From: matti at weiersmueller dot com Assigned:
Status: Closed Package: Apache related
PHP Version: 4.0.6 OS: Linux-mips
Private report: No CVE-ID: None
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 [2001-03-18 21:43 UTC] matti at weiersmueller dot com 
- HW: Cobalt Raq2 (MIPS R3000)
- OS: Linux
- Apache: 1.3.19
- PHP built with these arguments:
  --with-apxs
  --enable-trans-sid
- PHP release: 4.0.4pl1 and the latest CVS snapshot (date 18/03/2001)

when starting apache with "./httpd", a core is dumped. The message is: Floating point exception (core dumped)

I played around with gdb, the exception occurs in:

ext/standard/crypt.c:105
------------------------
php_srand(time(0) * getpid() * php_combined_lcg() * 10000.0 );

I played around with this line. When I replace the value 10000.0 with 1.0 and recompile the stuff, it works. I'm no C programmer, but I think this is due to an overflow problem.

If you need more informations, tell me!

Best regards

Matti Weiersmueller

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 [2001-03-18 21:51 UTC] matti at weiersmueller dot com 
The calculation itself does not lead to the overflow. I inserted this line right before the error happens:

fprintf (stdout, "Value: %f", ..calculation comes here ...);

So I guess the function accepts only numbers to a certain size. (values over approx. 2^34 or under 2^-34 makes apache hurl)
 [2001-05-07 04:45 UTC] zeev@php.net 
Can you please see if this still happens in PHP 4.0.5?  It's supposed to be fixed.
 [2001-05-10 14:42 UTC] matti at weiersmueller dot com 
no, it still behaves the same when using 4.0.5.
 [2001-08-21 16:14 UTC] matti at weiersmueller dot com 
still not fixed in 4.0.6
 [2001-10-20 23:06 UTC] sniper@php.net 
Fixed in CVS.

--Jani
 
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