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Bug #28676 Segmentation fault/crash while destroying large arrays at end of execution
Submitted: 2004-06-07 18:38 UTC Modified: 2004-06-08 09:57 UTC
Avg. Score:4.0 ± 1.0
Reproduced:2 of 2 (100.0%)
Same Version:1 (50.0%)
Same OS:1 (50.0%)
From: mikeb at tracersinfo dot com Assigned:
Status: Wont fix Package: Reproducible crash
PHP Version: 4.3.7 OS: WinXP; Mandrake Linux 2.4.22-26
Private report: No CVE-ID: None
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Bug Type:
From: mikeb at tracersinfo dot com
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 [2004-06-07 18:38 UTC] mikeb at tracersinfo dot com
In WinXP, crash occurs at $howmany >= 65537; in Mandrake Linux, crash (specifying Segmentation fault) occurs at $howmany >= 131073.  Note that crash only occurs *after* all statements are performed.

I have been able to reproduce this everywhere, with any 4.3.2+ version of PHP on all platforms, regardless of configuration or state of php.ini.

Reproduce code:
$string = "X";
$howmany = 65537;
$b4guts = mktime();
$guts = array();
for ( $x = 0; $x < $howmany; $x++ ) {
  $guts[$x] = $string;
$afterguts = mktime();
$gutstime = $afterguts - $b4guts;
echo "\nGuts built.  Time $gutstime seconds.  ", count($guts), " elements\n";

Expected result:
Normal program termination.

Actual result:
Windows generates a GPF requiring close of the process.  Mandrake Linux generates a "Segmentation fault".


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 [2004-06-08 09:57 UTC]
This is a limitation in PHP 4 (elements can only have 2^16 references too them), and is addressed in PHP 5. We will not fix this for PHP 4.
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