From: robert at rw-it dot net
Operating system: Win32
PHP version: 4.4.0
PHP Bug Type: Reproducible crash
Bug description: memory_limit doesn't prevent exit
Description:
------------
If memory_limit is turned on, memory will be marked as allocated although
it isn't, because the _CHECK_MEMORY_LIMIT macro (zend_alloc.c) starts like
this:
#define _CHECK_MEMORY_LIMIT(s, rs, file, lineno) { AG(allocated_memory) +=
rs;\
Thus, allocated_memory is increased by the block size, even though
zend_error might be called.
This seems to apply to PHP-5.0.4, too, but not tested (only looked at the
code).
Reproduce code:
---------------
Write some script that consumes all available memory:
for ($i = 0, $b = 'x'; ; $i++, $b .= $b)
echo "$i, ";
Reload a few times.
Expected result:
----------------
Same output everytime, no exit(1).
Output for memory_limit = 8M on my machine:
Allowed memory size of 8388608 bytes exhausted (tried to allocate 4194305
bytes)
Actual result:
--------------
Available memory decreases with each reload, until finally
AG(memory_limit)+1048576 < AG(allocated_memory) - rs and PHP exits.
Output for memory_limit = 8M:
Allowed memory size of 8388608 bytes exhausted (tried to allocate 4194305
bytes)
Allowed memory size of 8388608 bytes exhausted (tried to allocate 2097153
bytes)
...
Allowed memory size of 8388608 bytes exhausted (tried to allocate 2049
bytes)
(Server process exits on next reload)
--
Edit bug report at http://bugs.php.net/?id=34156&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=34156&r=trysnapshot4
Try a CVS snapshot (php5.0):
http://bugs.php.net/fix.php?id=34156&r=trysnapshot50
Try a CVS snapshot (php5.1):
http://bugs.php.net/fix.php?id=34156&r=trysnapshot51
Fixed in CVS: http://bugs.php.net/fix.php?id=34156&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=34156&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=34156&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=34156&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=34156&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=34156&r=support
Expected behavior: http://bugs.php.net/fix.php?id=34156&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=34156&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=34156&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=34156&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=34156&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=34156&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=34156&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=34156&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=34156&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=34156&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=34156&r=mysqlcfg
