php still tries to unlock the shared memory ZendSem with opcache.file_cache_only=1 but it was never locked

[tifeit]

Description

This is not a big deal, as the error happens in this case on PHP exit, the PHP code works, but maybe there are some other corner cases where this might be an issue.

mkdir /tmp/phpopcache

sudo chmod 777 /tmp/phpopcache

echo "<?php echo 'hi';" > test.php

sudo strace -s 256 -o strace.txt -u www-data /usr/bin/php -dopcache.enable=1 -dopcache.enable_cli=1 -dopcache.file_cache_only=1 -dopcache.file_cache="/tmp/phpopcache" -dopcache.log_verbosity_level=4 -dopcache.error_log=/tmp/opcache.error -f test.php

will produce

cat /tmp/opcache.error
Mon May 29 09:07:24 2023 (25731): Debug UnlockAll:  Bad file descriptor (9)

grep EBADF strace.txt
fcntl(0, F_SETLK, {l_type=F_UNLCK, l_whence=SEEK_SET, l_start=0, l_len=0}) = -1 EBADF (Bad file descriptor)

It seems like the lock file is created here
https://github.com/php/php-src/blob/master/ext/opcache/zend_shared_alloc.c#L103

but this code is executed only when the file_cache_only=0

php-src/ext/opcache/ZendAccelerator.c

Line 3200 in 2d883a6

if (!file_cache_only) {

i.e. the lock file is not created with file_cache_only=1

but regardless of the file_cache_only directive, the code tries to unlock it and generates the error here
https://github.com/php/php-src/blob/master/ext/opcache/ZendAccelerator.c#L401

PHP Version

8.1.17

Operating System

Ubuntu 18.04