We have a webserver where besides normal requests large files are being uploaded.
Some requests (such as 1/10) are dropped. We than see following errors in the error log.
==> /var/log/apache2/web_error_ssl.log <==
[Fri Dec 07 15:38:24.154218 2018] [php7:error] [pid 8333] [client ****:****:****:****:216:3eff:fe0b:bb4f:55760] PHP Fatal error: Cannot redeclare composerRequire2f3df4313599c81c8cd86cade0406e0b() (previously declared in /var/www/releases/test/vendor/composer/autoload_real.php:54) in /var/www/releases/test/vendor/composer/autoload_real.php on line 61
==> /var/log/apache2/error.log <==
[Fri Dec 07 15:38:24.385423 2018] [core:notice] [pid 18418] AH00052: child pid 8333 exit signal Segmentation fault (11)
==> /var/log/apache2/web_error_ssl.log <==
[Fri Dec 07 15:38:27.243422 2018] [php7:error] [pid 8318] [client ****:****:****:****:216:3eff:fe0b:bb4f:56308] PHP Fatal error: Cannot redeclare composerRequire2f3df4313599c81c8cd86cade0406e0b() (previously declared in /var/www/releases/test/vendor/composer/autoload_real.php:54) in /var/www/releases/test/vendor/composer/autoload_real.php on line 61
==> /var/log/apache2/error.log <==
zend_mm_heap corrupted
Environment:
Updated debian stretch
Apache version: 2.4.25-3+deb9u6 with prefork mpm.
PHP Version: 7.1.24-1+0~20181112093455.10+stretch~1.gbp09a4fd (from sury repository)
PHP loaded as apache2 module.
What we have tested so far:
- opcache.enable = 0 / 1
- opcache.enable_cli = 0 / 1
- output_buffering = Off / 4096 / 16777216
- realpath_cache_size = 0 / 4096k
- Replace several versions of PHP7.0 and PHP7.1 (from debian repo and from sury repo)
- index.php: define('HHVM_VERSION', ?); ? = true/false
- /etc/apache2/envvars: export USE_ZEND_ALLOC = 0 / 1
- switch over to backport kernel
What helps us is webserver reload - it fixes the problem for several minutes, then it starts again.
When we catch strace of failing process, we get:
open("/var/www/releases/test/vendor/composer/autoload_real.php", O_RDONLY) = 17
fstat(17, {st_mode=S_IFREG|0644, st_size=2103, ...}) = 0
fstat(17, {st_mode=S_IFREG|0644, st_size=2103, ...}) = 0
fstat(17, {st_mode=S_IFREG|0644, st_size=2103, ...}) = 0
fstat(17, {st_mode=S_IFREG|0644, st_size=2103, ...}) = 0
mmap(NULL, 2103, PROT_READ, MAP_SHARED, 17, 0) = 0x7f61c3186000
getpid() = 21075
getpid() = 21075
getpid() = 21075
write(12, "[Thu Dec 06 23:58:59.246179 2018] [php7:error] [pid 21075] [client ****:****:****:****::aaaa:1:31248] PHP Fatal error: Cannot redeclare composerRequire2f3df4313599c81c8cd86cade0406e0b() (previously declared in /var/www/releases/test/vendor/composer/autoload_real.php:54) in /var/www/releases/test/vendor/composer/autoload_real.php on line 61\n", 348) = 348
chdir("/") = 0
munmap(0x7f61ab800000, 16781312) = 0
setitimer(ITIMER_PROF, {it_interval={tv_sec=0, tv_usec=0}, it_value={tv_sec=0, tv_usec=0}}, NULL) = 0
--- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x7f61adfbae68} ---
autoload_real.php contains is a file generated by
composer install --no-progress --prefer-dist --no-dev --classmap-authoritative
and on lines 54 - 61 is following:
function composerRequire2f3df4313599c81c8cd86cade0406e0b($fileIdentifier, $file)
{
if (empty($GLOBALS['__composer_autoload_files'][$fileIdentifier])) {
require $file;
$GLOBALS['__composer_autoload_files'][$fileIdentifier] = true;
}
}
List of PHP modules:
root@server:~# dpkg -l | grep php7.1
ii libapache2-mod-php7.1 7.1.24-1+0~20181112093455.10+stretch~1.gbp09a4fd amd64 server-side, HTML-embedded scripting language (Apache 2 module)
ii php7.1-bcmath 7.1.24-1+0~20181112093455.10+stretch~1.gbp09a4fd amd64 Bcmath module for PHP
ii php7.1-cli 7.1.24-1+0~20181112093455.10+stretch~1.gbp09a4fd amd64 command-line interpreter for the PHP scripting language
ii php7.1-common 7.1.24-1+0~20181112093455.10+stretch~1.gbp09a4fd amd64 documentation, examples and common module for PHP
ii php7.1-curl 7.1.24-1+0~20181112093455.10+stretch~1.gbp09a4fd amd64 CURL module for PHP
ii php7.1-gd 7.1.24-1+0~20181112093455.10+stretch~1.gbp09a4fd amd64 GD module for PHP
ii php7.1-json 7.1.24-1+0~20181112093455.10+stretch~1.gbp09a4fd amd64 JSON module for PHP
ii php7.1-mbstring 7.1.24-1+0~20181112093455.10+stretch~1.gbp09a4fd amd64 MBSTRING module for PHP
ii php7.1-mysql 7.1.24-1+0~20181112093455.10+stretch~1.gbp09a4fd amd64 MySQL module for PHP
ii php7.1-opcache 7.1.24-1+0~20181112093455.10+stretch~1.gbp09a4fd amd64 Zend OpCache module for PHP
ii php7.1-readline 7.1.24-1+0~20181112093455.10+stretch~1.gbp09a4fd amd64 readline module for PHP
ii php7.1-sqlite3 7.1.24-1+0~20181112093455.10+stretch~1.gbp09a4fd amd64 SQLite3 module for PHP
ii php7.1-xml 7.1.24-1+0~20181112093455.10+stretch~1.gbp09a4fd amd64 DOM, SimpleXML, WDDX, XML, and XSL module for PHP
