Bug #73746 [Opn]: Method that returns string returns UNKNOWN:0 instead

Edit report at https://bugs.php.net/bug.php?id=73746&edit=1 ID: 73746 Updated by: yohgaki@php.net Reported by: info at mhlavac dot net Summary: Method that returns string returns UNKNOWN:0 instead Status: Open Type: Bug -Package: *General Issues +Package: opcache Operating System: Ubuntu 16.04 PHP Version: 7.1.0 Block user comment: N Private report: N New Comment: It seems this is an opcache issue. Works without opcache https://3v4l.org/Ju5dp PHP crashes with supplied INI on assertion [yohgaki@dev PHP-7.1]$ cat test.ini opcache.blacklist_filename= opcache.consistency_checks=0 opcache.dups_fix=Off opcache.enable=On opcache.enable_cli=On opcache.enable_file_override=Off opcache.error_log= opcache.fast_shutdown=1 opcache.file_cache= opcache.file_cache_consistency_checks=1 opcache.file_cache_only=0 opcache.file_update_protection=2 opcache.force_restart_timeout=180 opcache.huge_code_pages=Off opcache.inherited_hack=On opcache.interned_strings_buffer=16 opcache.lockfile_path=/tmp opcache.log_verbosity_level=1 opcache.max_accelerated_files=65407 opcache.max_file_size=0 opcache.max_wasted_percentage=5 opcache.memory_consumption=192 opcache.opt_debug_level=0 opcache.optimization_level=0x7FFFBFFF opcache.preferred_memory_model= opcache.protect_memory=0 opcache.restrict_api= opcache.revalidate_freq=0 opcache.revalidate_path=Off opcache.save_comments=1 opcache.use_cwd=On opcache.validate_permission=Off opcache.validate_root=Off opcache.validate_timestamps=On (gdb) bt #0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:58 #1 0x00007ffff19b752a in __GI_abort () at abort.c:89 #2 0x00007ffff19ade37 in __assert_fail_base (fmt=<optimized out>, assertion=assertion@entry=0x7fffe671da38 "(opline + 1)->opcode == 62 || (opline + 1)->opcode == 111", file=file@entry=0x7fffe671d460 "/home/yohgaki/git/oss/php.net/PHP-7.1/ext/opcache/Optimizer/zend_optimizer.c", line=line@entry=509, function=function@entry=0x7fffe671de40 <__PRETTY_FUNCTION__.13834> "zend_optimizer_replace_by_const") at assert.c:92 #3 0x00007ffff19adee2 in __GI___assert_fail (assertion=0x7fffe671da38 "(opline + 1)->opcode == 62 || (opline + 1)->opcode == 111", file=0x7fffe671d460 "/home/yohgaki/git/oss/php.net/PHP-7.1/ext/opcache/Optimizer/zend_optimizer.c", line=509, function=0x7fffe671de40 <__PRETTY_FUNCTION__.13834> "zend_optimizer_replace_by_const") at assert.c:101 #4 0x00007fffe66cf0b8 in zend_optimizer_replace_by_const (op_array=0x7fffed402250, opline=0x7fffed48b140, type=2 '\002', var=128, val=0x7fffffff9cd0) at /home/yohgaki/git/oss/php.net/PHP-7.1/ext/opcache/Optimizer/zend_optimizer.c:509 #5 0x00007fffe66d217e in zend_optimizer_pass1 (op_array=0x7fffed402250, ctx=0x7fffffff9ec0) at /home/yohgaki/git/oss/php.net/PHP-7.1/ext/opcache/Optimizer/pass1_5.c:353 #6 0x00007fffe66cfbe9 in zend_optimize (op_array=0x7fffed402250, ctx=0x7fffffff9ec0) at /home/yohgaki/git/oss/php.net/PHP-7.1/ext/opcache/Optimizer/zend_optimizer.c:697 #7 0x00007fffe66d01e5 in zend_optimize_op_array (op_array=0x7fffed402250, ctx=0x7fffffff9ec0) at /home/yohgaki/git/oss/php.net/PHP-7.1/ext/opcache/Optimizer/zend_optimizer.c:864 #8 0x00007fffe66d0549 in zend_optimize_script (script=0x7fffed477200, optimization_level=2147467263, debug_level=0) at /home/yohgaki/git/oss/php.net/PHP-7.1/ext/opcache/Optimizer/zend_optimizer.c:935 #9 0x00007fffe66aeb6c in cache_script_in_shared_memory (new_persistent_script=0x7fffed477200, key=0x7fffe6933cac <accel_globals+556> "t.p:169112:169192", key_length=17, from_shared_memory=0x7fffffffa0e0) at /home/yohgaki/git/oss/php.net/PHP-7.1/ext/opcache/ZendAccelerator.c:1271 #10 0x00007fffe66b0564 in persistent_compile_file (file_handle=0x7fffffffd720, type=8) at /home/yohgaki/git/oss/php.net/PHP-7.1/ext/opcache/ZendAccelerator.c:1863 #11 0x0000000000abc440 in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /home/yohgaki/git/oss/php.net/PHP-7.1/Zend/zend.c:1468 #12 0x0000000000a2a8fd in php_execute_script (primary_file=0x7fffffffd720) at /home/yohgaki/git/oss/php.net/PHP-7.1/main/main.c:2539 #13 0x0000000000b9c3e1 in do_cli (argc=6, argv=0x154c600) at /home/yohgaki/git/oss/php.net/PHP-7.1/sapi/cli/php_cli.c:990 #14 0x0000000000b9d3ab in main (argc=6, argv=0x154c600) at /home/yohgaki/git/oss/php.net/PHP-7.1/sapi/cli/php_cli.c:1378 Previous Comments: ------------------------------------------------------------------------ [2016-12-15 08:52:18] info at mhlavac dot net Description: ------------ We upgraded to php 7.1 and noticed some tests are failing. This method call returns UNKNOWN:0 since the upgrade. If we remove method return type, then we get expected string that is really returned by the method. I noticed that this "sometimes" doesn't happen for the first run, so it might be opcache related. I noticed, removing self::CZ and changing it to CountryMapping::CZ fixes the issue. Also removing return type fixes it as well. Opcache is enabled. Settings: opcache.blacklist_filename => no value => no value opcache.consistency_checks => 0 => 0 opcache.dups_fix => Off => Off opcache.enable => On => On opcache.enable_cli => On => On opcache.enable_file_override => Off => Off opcache.error_log => no value => no value opcache.fast_shutdown => 1 => 1 opcache.file_cache => no value => no value opcache.file_cache_consistency_checks => 1 => 1 opcache.file_cache_only => 0 => 0 opcache.file_update_protection => 2 => 2 opcache.force_restart_timeout => 180 => 180 opcache.huge_code_pages => Off => Off opcache.inherited_hack => On => On opcache.interned_strings_buffer => 16 => 16 opcache.lockfile_path => /tmp => /tmp opcache.log_verbosity_level => 1 => 1 opcache.max_accelerated_files => 65407 => 65407 opcache.max_file_size => 0 => 0 opcache.max_wasted_percentage => 5 => 5 opcache.memory_consumption => 192 => 192 opcache.opt_debug_level => 0 => 0 opcache.optimization_level => 0x7FFFBFFF => 0x7FFFBFFF opcache.preferred_memory_model => no value => no value opcache.protect_memory => 0 => 0 opcache.restrict_api => no value => no value opcache.revalidate_freq => 0 => 0 opcache.revalidate_path => Off => Off opcache.save_comments => 1 => 1 opcache.use_cwd => On => On opcache.validate_permission => Off => Off opcache.validate_root => Off => Off opcache.validate_timestamps => On => On Test script: --------------- <?php namespace Core\Bundle\Service\Property\Room\Rooms; class CountryMapping { const CZ = 'CZ'; const EN = 'EN'; public function get(string $countryIsoCode = null) : string // Works correctly if return type is removed { switch (strtoupper($countryIsoCode)) { case 'CZ': case 'SK': return self::CZ; // Works correctly if changed to CountryMapping::CZ default: return self::EN; // Works correctly if changed to CountryMapping::EN } } } $mapping = new CountryMapping(); var_dump($mapping->get('CZ')); Expected result: ---------------- string(2) "CZ" Actual result: -------------- UNKNOWN:0 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=73746&edit=1