Edit report at http://bugs.php.net/bug.php?id=51182&edit=1
ID: 51182
User updated by: torsten dot landmann at bauermedia dot com
Reported by: torsten dot landmann at bauermedia dot com
Summary: PHP crashes: "zend_mm_heap corrupted" after array
operation
-Status: Feedback
+Status: Open
Type: Bug
Package: Reproducible crash
Operating System: Ubuntu
PHP Version: 5.2.13
New Comment:
We'd love to but we're sorry, as already mentioned above, we're unable
provide this script. We've really, really tried to create something
simple for you but we didn't succeed. At the moment we can only
reproduce the problem with running our complete project.
Rewriting the mentioned line of code helps but that's all we can tell
you.
If the above information doesn't help you with identifying why all this
is happening, we'll probably have to watch this issue further and maybe
get back to you at a later time. Thanks.
Previous Comments:
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[2010-03-02 18:16:24] j...@php.net
-Status: Open
+Status: Feedback
------------------------------------------------------------------------
[2010-03-02 18:16:24] j...@php.net
Thank you for this bug report. To properly diagnose the problem, we
need a short but complete example script to be able to reproduce
this bug ourselves.
A proper reproducing script starts with <?php and ends with ?>,
is max. 10-20 lines long and does not require any external
resources such as databases, etc. If the script requires a
database to demonstrate the issue, please make sure it creates
all necessary tables, stored procedures etc.
Please avoid embedding huge scripts into the report.
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[2010-03-02 12:31:00] torsten dot landmann at bauermedia dot com
Description:
------------
We have a reproducible crash scenario but there are two problems with
that:
1. PHP doesn't crash EVERY time.
2. We didn't manage to reproduce the problem with a simple script yet.
It only happens in our Drupal-driven website with about 3000 files and a
complex database.
However we managed to isolate the problem to a single line in code,
which, if it gets rewritten, fixes the problem.
Because this line actually is a little weird and not good programming
style anyways, it seems plausible to us that you will be able to
comprehend the problem in PHP sourcecode if you look into it directly.
This is what happens if PHP crashes in our scenario:
1. The page gets completely rendered and output is written to the output
stream.
2. Shutdown functions are executed.
3. After executing the last statement of the last shutdown function PHP
suddenly crashes. The output buffer is discarded. The visitor sees blank
page. The Apache error log receives a line that reads "zend_mm_heap
corrupted"
The following is the line of code that seems to cause the problem. This
line of code is executed long before any output data is written and long
before shutdown functions get executed. It doesn't crash directly but
only seems to trigger a future crash:
$tax = current(taxonomy_node_get_terms($node));
($node is an instance of stdClass, taxonomy_node_get_terms() returns an
array.)
It seems that PHP may choke on its memory management later on when this
line has been executed before. Maybe there's a problem because the
return value is used for writing although not being saved in a
variable.
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Edit this bug report at http://bugs.php.net/bug.php?id=51182&edit=1
