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Disable opcache if no SHM backend is available

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Currently, configure fails when no SHM backend is available. Additionally,
even after bypassing the configure check, opcache emits a fatal error if no
SHM backend is available.

Make the configure check non-fatal (a warning is printed). At runtime, disable
opcache if no backend is available, in the same way we disable opcache by
default on CLI.

Closes GH-19350
This commit is contained in:
Arnaud Le Blanc 2025-08-02 10:49:05 +02:00
parent fe88711b14
commit e4078a6a70
No known key found for this signature in database
4 changed files with 12 additions and 2 deletions
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6
ext/opcache/ZendAccelerator.c
View file

@ -3241,6 +3241,12 @@ static zend_result accel_post_startup(void)
accel_startup_ok = false;
zend_accel_error_noreturn(ACCEL_LOG_FATAL, "Failure to initialize shared memory structures - probably not enough shared memory.");
return SUCCESS;
case NO_SHM_BACKEND:
zend_accel_error(ACCEL_LOG_INFO, "Opcode Caching is disabled: No available SHM backend. Set opcache.enable=0 to hide this message.");
zps_startup_failure("No available SHM backend", NULL, accelerator_remove_cb);
/* Do not abort PHP startup */
return SUCCESS;
case SUCCESSFULLY_REATTACHED:
#ifdef HAVE_JIT
reattached = true;

4
ext/opcache/config.m4
View file

@ -346,9 +346,9 @@ PHP_ADD_EXTENSION_DEP(opcache, date)
PHP_ADD_EXTENSION_DEP(opcache, pcre)
if test "$php_cv_shm_ipc" != "yes" && test "$php_cv_shm_mmap_posix" != "yes" && test "$php_cv_shm_mmap_anon" != "yes"; then
AC_MSG_FAILURE(m4_text_wrap([
AC_MSG_WARN(m4_text_wrap([
No supported shared memory caching support was found when configuring
opcache.
opcache. Opcache will be disabled.
]))
fi

3
ext/opcache/zend_shared_alloc.c
View file

@ -229,6 +229,9 @@ int zend_shared_alloc_startup(size_t requested_size, size_t reserved_size)
if (!g_shared_alloc_handler) {
/* try memory handlers in order */
if (handler_table->name == NULL) {
return NO_SHM_BACKEND;
}
for (he = handler_table; he->name; he++) {
res = zend_shared_alloc_try(he, requested_size, &ZSMMG(shared_segments), &ZSMMG(shared_segments_count), &error_in);
if (res) {

1
ext/opcache/zend_shared_alloc.h
View file

@ -72,6 +72,7 @@
#define SUCCESSFULLY_REATTACHED 4
#define ALLOC_FAIL_MAPPING 8
#define ALLOC_FALLBACK 9
#define NO_SHM_BACKEND 10
typedef struct _zend_shared_segment {
size_t size;