ID: 28396
User updated by: operator at infomaniak dot ch
Reported By: operator at infomaniak dot ch
Status: Open
Bug Type: Reproducible crash
Operating System: linux glibc 2.2
PHP Version: 4.3.6
New Comment:
Finaly, this won't segfault, you were right.
Then, it appears that in some rare conditions, just after
memory_limit reached, segfault comes.
But, this may be because of any other extension.
For this, could you tell how to compile seperate
extensions
(ala phpize etc...) with debug enabled ?
with a core compiled with --enable-debug, extensions still
get build without debug...
Previous Comments:
------------------------------------------------------------------------
[2004-05-14 16:41:46] operator at infomaniak dot ch
Have you really tried to put this script and run it
with a php_admin_value memory_limit 512000
?
------------------------------------------------------------------------
[2004-05-14 15:33:46] [EMAIL PROTECTED]
No crashes here and memory analysis tools show no
suspicious operations.
------------------------------------------------------------------------
[2004-05-14 14:05:59] operator at infomaniak dot ch
Alright. This is not true.
Memory allocation failing due to external bad behaviour
must cause segfault, not because of memory_limit reached.
Then, I get exactly the same result without
--enable-debug .
For info, crash occurs exactly when memory_limit is
reached.
(output just before crash:
509528
510552
511576
with a memory limit at 512000
output got without --enable-debug)
)
------------------------------------------------------------------------
[2004-05-14 13:46:19] [EMAIL PROTECTED]
This is expected behaviour; in a debug build, when memory allocation
fails, we force a segfault.
Don't run debug builds in production.
------------------------------------------------------------------------
[2004-05-14 13:23:01] operator at infomaniak dot ch
Description:
------------
When memory limit is reached, this irremdiably cause a
segfault.
--
php with no extensions at all compiled with:
--disable-all \
--with-apxs=/usr/sbin/apxs \
--enable-sigchild \
--disable-ipv6 \
--enable-memory-limit \
--with-config-file-path=/etc/httpd \
--disable-static \
--enable-shared \
--enable-debug
reproductible with any memory_limit value (tried from 512
bytes to 8M)
Reproduce code:
---------------
<?
$i=1;
while($i++) {
$a .= ".";
if (($i % 1024) == 0) {
echo memory_get_usage() . "<br/>\n";
flush();
}
}
?>
Expected result:
----------------
some kind of "memory exhausted" message
Actual result:
--------------
apache thread segfault
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=28396&edit=1
