Bug #77647 [NEW]: preload: Access violation in zend_mm_shutdown

From: mberchtold at gmail dot com Operating system: Windows 10 x64 PHP version: master-Git-2019-02-21 (snap) Package: opcache Bug Type: Bug Bug description:preload: Access violation in zend_mm_shutdown Description: ------------ With preloading (preloading of zend framework 3, others) enabled, visiting certain urls of the website crashes php-cgi.exe When preloading is disabled, or when no classes are preloaded it does not crash. php master: r82d6759 > php8.dll!zend_mm_shutdown(_zend_mm_heap * heap, int full, int silent) Line 2269 C [Inline Frame] php8.dll!shutdown_memory_manager(int) C php8.dll!php_module_startup(_sapi_module_struct * sf, _zend_module_entry * additional_modules, unsigned int num_additional_modules) Line 2405 C php-cgi.exe!php_cgi_startup(_sapi_module_struct * sapi_module) Line 973 C php-cgi.exe!main(int argc, char * * argv) Line 1921 C [Inline Frame] php-cgi.exe!invoke_main() Line 78 C++ php-cgi.exe!__scrt_common_main_seh() Line 288 C++ kernel32.dll!00007ff81f3b81f4() Unknown ntdll.dll!00007ff82174a251() Unknown zend_mm_shutdown ... Code: /* move all chunks except of the first one into the cache */ p = heap->main_chunk->next; while (p != heap->main_chunk) { ---> zend_mm_chunk *q = p->next; // p is null p->next = heap->cached_chunks; heap->cached_chunks = p; p = q; heap->chunks_count--; heap->cached_chunks_count++; } Locals: + heap 0x0000026899200040 {use_custom_heap=0x00000000 storage=0x0000000000000000 <NULL> size=0x0000000000000000 ...} _zend_mm_heap * + heap->main_chunk 0x0000026899200000 {heap=0x0000026899200040 {use_custom_heap=0x00000000 storage=0x0000000000000000 <NULL> ...} ...} _zend_mm_chunk * + heap->main_chunk->next 0x0000000000000000 <NULL> _zend_mm_chunk * + p 0x0000000000000000 <NULL> _zend_mm_chunk * For some reason, heap->main_chunk->next is NULL which looks unexpected (heap corruption?). Test script: --------------- I don't have a reproducible case other than that it always crashes when accessing a certain url on an internal website. Expected result: ---------------- no crash Actual result: -------------- Unhandled exception thrown: read access violation. -- Edit bug report at https://bugs.php.net/bug.php?id=77647&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=77647&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=77647&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=77647&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=77647&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=77647&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=77647&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=77647&r=needscript Try newer version: https://bugs.php.net/fix.php?id=77647&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=77647&r=support Expected behavior: https://bugs.php.net/fix.php?id=77647&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=77647&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=77647&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=77647&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=77647&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=77647&r=dst IIS Stability: https://bugs.php.net/fix.php?id=77647&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=77647&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=77647&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=77647&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=77647&r=mysqlcfg