#32254 [NEW]: Nested try-catch blocks may cause segfault
From: shulmanb at il dot ibm dot com
Operating system: Linux
PHP version: 5CVS-2005-03-09 (dev)
PHP Bug Type: Zend Engine 2 problem
Bug description: Nested try-catch blocks may cause segfault
Description:
------------
When compiled with --enable-maintainer-zts, having nested try-catch blocks
may cause segfaults in some cases.
In the following code fragment, commenting out the outer try-catch block
solves the segfault.
This DOES NOT HAPPEN when compiled with debug symbols.
This may be related to bug #32252 (for instance, if the index to $list is
positive, crash does not occur).
Reproduce code:
---------------
class a implements ArrayAccess {
function offsetExists ($offset) { return false; }
function offsetGet ($offset) { return null; }
function offsetSet ($offset, $value) { throw new Exception ("Oops");
}
function offsetUnset ($offset) { }
}
function test () {
try {
$list = new a();
$caught = 0;
try {
$list[-1] = 123;
} catch (Exception $e) {
$caught = 1;
}
if (!$caught)
return false;
return true;
}
catch (Exception $e) {
return false;
}
}
print test();
Expected result:
----------------
The output should be "1"
Actual result:
--------------
Segmentation fault.
PHP was compiled without debug symbols. The stack trace provided by gdb
was:
#0 0x08184ecd in zend_hash_destroy (ht=0x8c579c08)
at /root/php-5.0.3/Zend/zend_hash.c:524
--
Edit bug report at http://bugs.php.net/?id=32254&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=32254&r=trysnapshot4
Try a CVS snapshot (php5.0): http://bugs.php.net/fix.php?id=32254&r=trysnapshot50
Try a CVS snapshot (php5.1): http://bugs.php.net/fix.php?id=32254&r=trysnapshot51
Fixed in CVS: http://bugs.php.net/fix.php?id=32254&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=32254&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=32254&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=32254&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=32254&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=32254&r=support
Expected behavior: http://bugs.php.net/fix.php?id=32254&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=32254&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=32254&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=32254&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=32254&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=32254&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=32254&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=32254&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=32254&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=32254&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=32254&r=mysqlcfg
Thread (4 messages)
- shulmanb at il dot ibm dot com