Bug #78335 [NEW]: Segfault in zend_mm_find_leaks_small

From: Date: Thu, 25 Jul 2019 16:27:23 +0000
Subject: Bug #78335 [NEW]: Segfault in zend_mm_find_leaks_small
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-221940@lists.php.net to get a copy of this message 
From:             kelunik
Operating system: Ubuntu 19.04
PHP version:      7.3.7
Package:          Reproducible crash
Bug Type:         Bug
Bug description:Segfault in zend_mm_find_leaks_small

Description:
------------
PHP segfaults in debug builds inside the memory leak detection code.

Test script:
---------------
<?php

// https://github.com/amphp/hpack/issues/2
// Commit: 0c16dfb577458dd3527167c0cb4807f5ccf76b59

require __DIR__ . '/vendor/autoload.php';

(function () {
    var_dump(count(static::$huffmanLookup));
})->bindTo(new Amp\Http\HPack, Amp\Http\HPack::class)();



Expected result:
----------------
No segfault.

Actual result:
--------------
Program received signal SIGSEGV, Segmentation fault.

#0  0x0000555555dfa121 in zend_mm_find_leaks_small (p=0x7ffff3600000,
i=509, j=38, leak=0x7fffffffbb80) at
/home/kelunik/.php-build/release/Zend/zend_alloc.c:2056
#1  0x0000555555dfa285 in zend_mm_find_leaks (heap=0x7ffff4000040,
p=0x7ffff3600000, i=509, leak=0x7fffffffbb80) at
/home/kelunik/.php-build/release/Zend/zend_alloc.c:2084
#2  0x0000555555dfa768 in zend_mm_check_leaks (heap=0x7ffff4000040) at
/home/kelunik/.php-build/release/Zend/zend_alloc.c:2188
#3  0x0000555555dfaa49 in zend_mm_shutdown (heap=0x7ffff4000040, full=0,
silent=0) at /home/kelunik/.php-build/release/Zend/zend_alloc.c:2253
#4  0x0000555555dfb852 in shutdown_memory_manager (silent=0,
full_shutdown=0) at
/home/kelunik/.php-build/release/Zend/zend_alloc.c:2668
#5  0x0000555555d98468 in php_request_shutdown (dummy=0x0) at
/home/kelunik/.php-build/release/main/main.c:1949
#6  0x0000555555f128c7 in do_cli (argc=2, argv=0x55555697cde0) at
/home/kelunik/.php-build/release/sapi/cli/php_cli.c:1164
#7  0x0000555555f13141 in main (argc=2, argv=0x55555697cde0) at
/home/kelunik/.php-build/release/sapi/cli/php_cli.c:1389

-- 
Edit bug report at https://bugs.php.net/bug.php?id=78335&edit=1
-- 
Try a snapshot (PHP 5.4):   https://bugs.php.net/fix.php?id=78335&r=trysnapshot54
Try a snapshot (PHP 5.5):   https://bugs.php.net/fix.php?id=78335&r=trysnapshot55
Try a snapshot (trunk):     https://bugs.php.net/fix.php?id=78335&r=trysnapshottrunk
Fixed in SVN:               https://bugs.php.net/fix.php?id=78335&r=fixed
Fixed in release:           https://bugs.php.net/fix.php?id=78335&r=alreadyfixed
Need backtrace:             https://bugs.php.net/fix.php?id=78335&r=needtrace
Need Reproduce Script:      https://bugs.php.net/fix.php?id=78335&r=needscript
Try newer version:          https://bugs.php.net/fix.php?id=78335&r=oldversion
Not developer issue:        https://bugs.php.net/fix.php?id=78335&r=support
Expected behavior:          https://bugs.php.net/fix.php?id=78335&r=notwrong
Not enough info:            https://bugs.php.net/fix.php?id=78335&r=notenoughinfo
Submitted twice:            https://bugs.php.net/fix.php?id=78335&r=submittedtwice
register_globals:           https://bugs.php.net/fix.php?id=78335&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=78335&r=php4
Daylight Savings:           https://bugs.php.net/fix.php?id=78335&r=dst
IIS Stability:              https://bugs.php.net/fix.php?id=78335&r=isapi
Install GNU Sed:            https://bugs.php.net/fix.php?id=78335&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=78335&r=float
No Zend Extensions:         https://bugs.php.net/fix.php?id=78335&r=nozend
MySQL Configuration Error:  https://bugs.php.net/fix.php?id=78335&r=mysqlcfg

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