Edit report at https://bugs.php.net/bug.php?id=77194&edit=1
ID: 77194
Updated by: ab@php.net
Reported by: svbussww at 126 dot com
Summary: php7ts.dll crashing when running embed
Status: Open
Type: Bug
Package: Reproducible crash
Operating System: Windows 7
PHP Version: 7.2.12
Block user comment: N
Private report: N
New Comment:
@jr at concept-br dot de, please post a backtrace.
Thanks.
Previous Comments:
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[2018-12-07 11:01:55] jr at concept-br dot de
Same Problem here also in 7.2.13 on Windows Server 2012 R2. We restart the apache service every hour
to "workaround" until a bugfix is released
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[2018-11-29 16:49:12] svbussww at 126 dot com
I have uploaded a fix.
Use _aligned_malloc and _aligned_free instead of unreliable VirtualAlloc and VirtualFree
------------------------------------------------------------------------
[2018-11-27 13:41:27] svbussww at 126 dot com
Fix the temporary plan
static void *zend_mm_chunk_alloc_int(size_t size, size_t alignment)
{
void *ptr = zend_mm_mmap(size);
if (ptr == NULL) {
return NULL;
} else if (ZEND_MM_ALIGNED_OFFSET(ptr, alignment) == 0) {
#ifdef MADV_HUGEPAGE
madvise(ptr, size, MADV_HUGEPAGE);
#endif
return ptr;
} else {
size_t offset;
/* chunk has to be aligned */
zend_mm_munmap(ptr, size);
LOOP:;
ptr = zend_mm_mmap(size + alignment - REAL_PAGE_SIZE);
if (ptr == NULL) return NULL;
#ifdef _WIN32
offset = ZEND_MM_ALIGNED_OFFSET(ptr, alignment);
zend_mm_munmap(ptr, size + alignment - REAL_PAGE_SIZE);
ptr = zend_mm_mmap_fixed((void*)((char*)ptr + (alignment - offset)), size);
if(ptr == NULL) goto LOOP;
offset = ZEND_MM_ALIGNED_OFFSET(ptr, alignment);
if (offset != 0) {
zend_mm_munmap(ptr, size);
return NULL;
}
return ptr;
#else
offset = ZEND_MM_ALIGNED_OFFSET(ptr, alignment);
if (offset != 0) {
offset = alignment - offset;
zend_mm_munmap(ptr, offset);
ptr = (char*)ptr + offset;
alignment -= offset;
}
if (alignment > REAL_PAGE_SIZE) {
zend_mm_munmap((char*)ptr + size, alignment - REAL_PAGE_SIZE);
}
# ifdef MADV_HUGEPAGE
madvise(ptr, size, MADV_HUGEPAGE);
# endif
#endif
return ptr;
}
}
------------------------------------------------------------------------
[2018-11-27 12:46:17] svbussww at 126 dot com
The bug has been found
file Zend/zend_alloc.c
function zend_mm_chunk_alloc_int
zend_mm_mmap After not aligned
zend_mm_mmap_fixed Call failed is return 0
The cause of the bug
zend_mm_mmap The allocated memory address is released. In the case of multithreading, it may be
preempted by other threads.
This causes the subsequent zend_mm_mmap_fixed function to allocate memory and cause the program to
crash.
Temporary solution
static void *zend_mm_chunk_alloc_int(size_t size, size_t alignment)
{
LOOP:;
void *ptr = zend_mm_mmap(size);
if (ptr == NULL) {
return NULL;
} else if (ZEND_MM_ALIGNED_OFFSET(ptr, alignment) == 0) {
#ifdef MADV_HUGEPAGE
madvise(ptr, size, MADV_HUGEPAGE);
#endif
return ptr;
} else {
size_t offset;
/* chunk has to be aligned */
zend_mm_munmap(ptr, size);
ptr = zend_mm_mmap(size + alignment - REAL_PAGE_SIZE);
#ifdef _WIN32
offset = ZEND_MM_ALIGNED_OFFSET(ptr, alignment);
zend_mm_munmap(ptr, size + alignment - REAL_PAGE_SIZE);
ptr = zend_mm_mmap_fixed((void*)((char*)ptr + (alignment - offset)), size);
if(ptr == NULL) goto LOOP;
offset = ZEND_MM_ALIGNED_OFFSET(ptr, alignment);
if (offset != 0) {
zend_mm_munmap(ptr, size);
return NULL;
}
return ptr;
#else
offset = ZEND_MM_ALIGNED_OFFSET(ptr, alignment);
if (offset != 0) {
offset = alignment - offset;
zend_mm_munmap(ptr, offset);
ptr = (char*)ptr + offset;
alignment -= offset;
}
if (alignment > REAL_PAGE_SIZE) {
zend_mm_munmap((char*)ptr + size, alignment - REAL_PAGE_SIZE);
}
# ifdef MADV_HUGEPAGE
madvise(ptr, size, MADV_HUGEPAGE);
# endif
#endif
return ptr;
}
}
I hope the development team can solve this bug as soon as possible.
------------------------------------------------------------------------
[2018-11-27 12:03:08] svbussww at 126 dot com
Can't initialize heap: [0x000001e7] Attempt to access invalid address.
Tracking source code is generated from zend_alloc.c
in zend_mm_mmap_fixed
VirtualAlloc Error return NULL
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