From: julien at palard dot fr
Operating system: Debian 6.0.7
PHP version: 5.4.13
Package: *General Issues
Bug Type: Bug
Bug description:Segfault (For the moment, can't reproduce it)
Description:
------------
I got a chance of 0.018% of segfaulting in my current setup, can't
reproduce it for the moment.
But I got a stacktrace ! :-)
gdb /usr/local/php-current/sbin/php-fpm ./core.php-fpm.9958
list
2105 mm_block = ZEND_MM_PREV_BLOCK(mm_block);
2106 zend_mm_remove_from_free_list(heap,
(zend_mm_free_block *) mm_block);
2107 size += ZEND_MM_FREE_BLOCK_SIZE(mm_block);
2108 }
2109 if (ZEND_MM_IS_FIRST_BLOCK(mm_block) &&
2110 ZEND_MM_IS_GUARD_BLOCK(ZEND_MM_BLOCK_AT(mm_block,
size))) {
2111 zend_mm_del_segment(heap, (zend_mm_segment *)
((char *)mm_block - ZEND_MM_ALIGNED_SEGMENT_SIZE));
2112 } else {
2113 ZEND_MM_BLOCK(mm_block, ZEND_MM_FREE_BLOCK, size);
2114 zend_mm_add_to_free_list(heap, (zend_mm_free_block
*) mm_block);
(gdb) bt
#0 _zend_mm_free_int (heap=0x143a330, p=0x1b15518) at
/usr/src/php-5.4.13/Zend/zend_alloc.c:2100
#1 0x000000000068ef1b in zend_hash_destroy (ht=0x1700318) at
/usr/src/php-5.4.13/Zend/zend_hash.c:560
#2 0x00000000006a2ffc in zend_object_std_dtor (object=0x168a238) at
/usr/src/php-5.4.13/Zend/zend_objects.c:44
#3 0x00000000006a3089 in zend_objects_free_object_storage
(object=0x143a330) at /usr/src/php-5.4.13/Zend/zend_objects.c:137
#4 0x00000000006a87ca in zend_objects_store_free_object_storage
(objects=0xe2d3c0) at /usr/src/php-5.4.13/Zend/zend_objects_API.c:92
#5 0x0000000000677f9a in shutdown_executor () at
/usr/src/php-5.4.13/Zend/zend_execute_API.c:297
#6 0x0000000000682c93 in zend_deactivate () at
/usr/src/php-5.4.13/Zend/zend.c:938
#7 0x0000000000627e0f in php_request_shutdown (dummy=<value optimized
out>) at /usr/src/php-5.4.13/main/main.c:1800
#8 0x0000000000730c63 in main (argc=<value optimized out>, argv=<value
optimized out>) at /usr/src/php-5.4.13/sapi/fpm/fpm/fpm_main.c:1952
(gdb) p *next_block
Cannot access memory at address 0x656d616e7624c470
(gdb) print next_block
$7 = (zend_mm_block *) 0x656d616e7624c470
Pointer strangely look like ASCII / UTF8 data, but .. don't know, dropping
it here, if it can help :
$ echo $'\x65\x6d\x61\x6e\x76\x24\xc4\x70'
emanv$�p
Expected result:
----------------
No Segfault :)
Actual result:
--------------
Segfault ):
--
Edit bug report at https://bugs.php.net/bug.php?id=64463&edit=1
--
Try a snapshot (PHP 5.4):
https://bugs.php.net/fix.php?id=64463&r=trysnapshot54
Try a snapshot (PHP 5.3):
https://bugs.php.net/fix.php?id=64463&r=trysnapshot53
Try a snapshot (trunk):
https://bugs.php.net/fix.php?id=64463&r=trysnapshottrunk
Fixed in SVN: https://bugs.php.net/fix.php?id=64463&r=fixed
Fixed in release: https://bugs.php.net/fix.php?id=64463&r=alreadyfixed
Need backtrace: https://bugs.php.net/fix.php?id=64463&r=needtrace
Need Reproduce Script: https://bugs.php.net/fix.php?id=64463&r=needscript
Try newer version: https://bugs.php.net/fix.php?id=64463&r=oldversion
Not developer issue: https://bugs.php.net/fix.php?id=64463&r=support
Expected behavior: https://bugs.php.net/fix.php?id=64463&r=notwrong
Not enough info:
https://bugs.php.net/fix.php?id=64463&r=notenoughinfo
Submitted twice:
https://bugs.php.net/fix.php?id=64463&r=submittedtwice
register_globals: https://bugs.php.net/fix.php?id=64463&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=64463&r=php4
Daylight Savings: https://bugs.php.net/fix.php?id=64463&r=dst
IIS Stability: https://bugs.php.net/fix.php?id=64463&r=isapi
Install GNU Sed: https://bugs.php.net/fix.php?id=64463&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=64463&r=float
No Zend Extensions: https://bugs.php.net/fix.php?id=64463&r=nozend
MySQL Configuration Error: https://bugs.php.net/fix.php?id=64463&r=mysqlcfg
