[BUG] "memory violation" error after installing ddtrace

[antivanity]

Bug description

When enabling the ddtrace extension, i receive a "service unavailable" page when loadig any page/domain.

PHP-FPM Error: [06-Jun-2022 18:40:07] WARNING: [pool www] child 6091 exited on signal 11 (SIGSEGV) after 200.826506 seconds from start [06-Jun-2022 18:40:07] NOTICE: [pool www] child 8886 started

HTTP Error: [Mon Jun 06 18:41:48.401921 2022] [proxy_fcgi:error] [pid 28336:tid 140221001717504] [client 47.205.148.157:51167] AH01067: Failed to read FastCGI header [Mon Jun 06 18:41:48.401949 2022] [proxy_fcgi:error] [pid 28336:tid 140221001717504] (104)Connection reset by peer: [client 47.205.148.157:51167] AH01075: Error dispatching request to :

Kernal Error: Jun 6 18:42:36 ip-10-0-2-247 kernel: php-fpm[6500]: segfault at 0 ip 00007f0acc8358c1 sp 00007ffcc79b3c18 error 4 in libc-2.17.so[7f0acc6c6000+1c4000] Jun 6 18:42:36 ip-10-0-2-247 kernel: type=1701 audit(1654555356.052:35670406): auid=4294967295 uid=48 gid=48 ses=4294967295 pid=6500 comm="php-fpm" reason="memory violation" sig=11

PHP version

PHP 5.6.40 (cli) (built: Nov 15 2021 11:30:01) Copyright (c) 1997-2016 The PHP Group Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies with Xdebug v2.5.5, Copyright (c) 2002-2017, by Derick Rethans with ddtrace v0.74.0, Copyright Datadog, by Datadog

Tracer version

0.74.0

Installed extensions

apc apcu bcmath bz2 calendar Core ctype curl date dba ddtrace dom enchant ereg exif fileinfo filter ftp gd gettext hash iconv igbinary imagick imap intl json ldap libxml mbstring mcrypt memcached mhash msgpack mysql mysqli mysqlnd odbc openssl pcntl pcre PDFlib PDO pdo_mysql PDO_ODBC pdo_pgsql pdo_sqlite pgsql Phar posix pspell readline recode Reflection session shmop SimpleXML snmp soap sockets SPL sqlite3 standard sysvmsg sysvsem sysvshm tidy tokenizer wddx xdebug xml xmlreader xmlrpc xmlwriter xsl Zend OPcache zip zlib

OS info

NAME="CentOS Linux" VERSION="7 (Core)" VERSION_ID="7" PRETTY_NAME="CentOS Linux 7 (Core)" CPE_NAME="cpe:/o:centos:centos:7" CENTOS_MANTISBT_PROJECT_VERSION="7" REDHAT_SUPPORT_PRODUCT_VERSION="7"

Diagnostics and configuration

Output of phpinfo() (ddtrace >= 0.47.0)

Unable to get web based version of this as i cant enable ddtrace and load the site, showing CLI info ddtrace

Datadog PHP tracer extension For help, check out the documentation at https://docs.datadoghq.com/tracing/languages/php/ (c) Datadog 2020

Datadog tracing support => disabled Version => 0.74.0 DATADOG TRACER CONFIGURATION => {"date":"2022-06-06T22:44:55Z","os_name":"Linux ip-10-0-2-247.ec2.internal 3.10.0-1127.19.1.el7.x86_64 #1 SMP Tue Aug 25 17:23:54 UTC 2020 x86_64","os_version":"3.10.0-1127.19.1.el7.x86_64","version":"0.74.0","lang":"php","lang_version":"5.6.40","env":null,"enabled":true,"service":null,"enabled_cli":false,"agent_url":"http:\/\/localhost:8126","debug":false,"analytics_enabled":false,"sample_rate":1,"sampling_rules":[],"tags":[],"service_mapping":[],"distributed_tracing_enabled":true,"priority_sampling_enabled":true,"dd_version":null,"architecture":"x86_64","sapi":"cli","datadog.trace.request_init_hook":"\/opt\/datadog-php\/dd-trace-sources\/bridge\/dd_wrap_autoloader.php","open_basedir_configured":false,"uri_fragment_regex":null,"uri_mapping_incoming":null,"uri_mapping_outgoing":null,"auto_flush_enabled":false,"generate_root_span":true,"http_client_split_by_domain":false,"measure_compile_time":true,"report_hostname_on_root_span":false,"traced_internal_functions":null,"auto_prepend_file_configured":false,"integrations_disabled":"default","enabled_from_env":false,"opcache.file_cache":null}

Directive => Local Value => Master Value ddtrace.disable => Off => Off ddtrace.cgroup_file => /proc/self/cgroup => /proc/self/cgroup datadog.trace.request_init_hook => /opt/datadog-php/dd-trace-sources/bridge/dd_wrap_autoloader.php => /opt/datadog-php/dd-trace-sources/bridge/dd_wrap_autoloader.php ddtrace.request_init_hook => /opt/datadog-php/dd-trace-sources/bridge/dd_wrap_autoloader.php => /opt/datadog-php/dd-trace-sources/bridge/dd_wrap_autoloader.php datadog.trace.agent_url => no value => no value datadog.agent_host => localhost => localhost datadog.distributed_tracing => On => On datadog.dogstatsd_port => 8125 => 8125 datadog.env => no value => no value datadog.autofinish_spans => Off => Off datadog.trace.url_as_resource_names_enabled => On => On datadog.integrations_disabled => default => default datadog.priority_sampling => On => On datadog.service => no value => no value datadog.service_name => no value => no value datadog.service_mapping => no value => no value datadog.tags => no value => no value datadog.trace.global_tags => no value => no value datadog.trace.agent_port => 8126 => 8126 datadog.trace.analytics_enabled => Off => Off datadog.trace.auto_flush_enabled => Off => Off datadog.trace.cli_enabled => Off => Off datadog.trace.measure_compile_time => On => On datadog.trace.debug => Off => Off datadog.trace.enabled => Off => On datadog.trace.health_metrics_enabled => Off => Off datadog.trace.health_metrics_heartbeat_sample_rate => 0.001 => 0.001 datadog.trace.db_client_split_by_instance => Off => Off datadog.trace.http_client_split_by_domain => Off => Off datadog.trace.redis_client_split_by_host => Off => Off datadog.trace.memory_limit => no value => no value datadog.trace.report_hostname => Off => Off datadog.trace.resource_uri_fragment_regex => no value => no value datadog.trace.resource_uri_mapping_incoming => no value => no value datadog.trace.resource_uri_mapping_outgoing => no value => no value datadog.trace.resource_uri_query_param_allowed => no value => no value datadog.trace.http_url_query_param_allowed => no value => no value datadog.trace.sample_rate => 1 => 1 datadog.sampling_rate => 1 => 1 datadog.trace.sampling_rules => [] => [] datadog.trace.header_tags => no value => no value datadog.trace.tags_propagation_max_length => 512 => 512 datadog.trace.traced_internal_functions => no value => no value datadog.trace.agent_timeout => 500 => 500 datadog.trace.agent_connect_timeout => 100 => 100 datadog.trace.debug_prng_seed => -1 => -1 datadog.log_backtrace => Off => Off datadog.trace.generate_root_span => On => On datadog.trace.spans_limit => 1000 => 1000 datadog.trace.agent_max_consecutive_failures => 3 => 3 datadog.trace.agent_attempt_retry_time_msec => 5000 => 5000 datadog.trace.bgs_connect_timeout => 2000 => 2000 datadog.trace.bgs_timeout => 5000 => 5000 datadog.trace.agent_flush_interval => 5000 => 5000 datadog.trace.agent_flush_after_n_requests => 10 => 10 datadog.trace.shutdown_timeout => 5000 => 5000 datadog.trace.startup_logs => On => On datadog.trace.agent_debug_verbose_curl => Off => Off datadog.trace.debug_curl_output => Off => Off datadog.trace.beta_high_memory_pressure_percent => 80 => 80 datadog.trace.warn_legacy_dd_trace => On => On datadog.trace.retain_thread_capabilities => Off => Off datadog.version => no value => no value datadog.trace.warn_call_stack_depth => On => On datadog.trace.cakephp_enabled => On => On datadog.trace.cakephp_analytics_enabled => Off => Off datadog.cakephp_analytics_enabled => Off => Off datadog.trace.cakephp_analytics_sample_rate => 1 => 1 datadog.cakephp_analytics_sample_rate => 1 => 1 datadog.trace.codeigniter_enabled => On => On datadog.trace.codeigniter_analytics_enabled => Off => Off datadog.codeigniter_analytics_enabled => Off => Off datadog.trace.codeigniter_analytics_sample_rate => 1 => 1 datadog.codeigniter_analytics_sample_rate => 1 => 1 datadog.trace.curl_enabled => On => On datadog.trace.curl_analytics_enabled => Off => Off datadog.curl_analytics_enabled => Off => Off datadog.trace.curl_analytics_sample_rate => 1 => 1 datadog.curl_analytics_sample_rate => 1 => 1 datadog.trace.elasticsearch_enabled => On => On datadog.trace.elasticsearch_analytics_enabled => Off => Off datadog.elasticsearch_analytics_enabled => Off => Off datadog.trace.elasticsearch_analytics_sample_rate => 1 => 1 datadog.elasticsearch_analytics_sample_rate => 1 => 1 datadog.trace.eloquent_enabled => On => On datadog.trace.eloquent_analytics_enabled => Off => Off datadog.eloquent_analytics_enabled => Off => Off datadog.trace.eloquent_analytics_sample_rate => 1 => 1 datadog.eloquent_analytics_sample_rate => 1 => 1 datadog.trace.guzzle_enabled => On => On datadog.trace.guzzle_analytics_enabled => Off => Off datadog.guzzle_analytics_enabled => Off => Off datadog.trace.guzzle_analytics_sample_rate => 1 => 1 datadog.guzzle_analytics_sample_rate => 1 => 1 datadog.trace.laravel_enabled => On => On datadog.trace.laravel_analytics_enabled => Off => Off datadog.laravel_analytics_enabled => Off => Off datadog.trace.laravel_analytics_sample_rate => 1 => 1 datadog.laravel_analytics_sample_rate => 1 => 1 datadog.trace.lumen_enabled => On => On datadog.trace.lumen_analytics_enabled => Off => Off datadog.lumen_analytics_enabled => Off => Off datadog.trace.lumen_analytics_sample_rate => 1 => 1 datadog.lumen_analytics_sample_rate => 1 => 1 datadog.trace.memcached_enabled => On => On datadog.trace.memcached_analytics_enabled => Off => Off datadog.memcached_analytics_enabled => Off => Off datadog.trace.memcached_analytics_sample_rate => 1 => 1 datadog.memcached_analytics_sample_rate => 1 => 1 datadog.trace.mongo_enabled => On => On datadog.trace.mongo_analytics_enabled => Off => Off datadog.mongo_analytics_enabled => Off => Off datadog.trace.mongo_analytics_sample_rate => 1 => 1 datadog.mongo_analytics_sample_rate => 1 => 1 datadog.trace.mongodb_enabled => On => On datadog.trace.mongodb_analytics_enabled => Off => Off datadog.mongodb_analytics_enabled => Off => Off datadog.trace.mongodb_analytics_sample_rate => 1 => 1 datadog.mongodb_analytics_sample_rate => 1 => 1 datadog.trace.mysqli_enabled => On => On datadog.trace.mysqli_analytics_enabled => Off => Off datadog.mysqli_analytics_enabled => Off => Off datadog.trace.mysqli_analytics_sample_rate => 1 => 1 datadog.mysqli_analytics_sample_rate => 1 => 1 datadog.trace.nette_enabled => On => On datadog.trace.nette_analytics_enabled => Off => Off datadog.nette_analytics_enabled => Off => Off datadog.trace.nette_analytics_sample_rate => 1 => 1 datadog.nette_analytics_sample_rate => 1 => 1 datadog.trace.pdo_enabled => On => On datadog.trace.pdo_analytics_enabled => Off => Off datadog.pdo_analytics_enabled => Off => Off datadog.trace.pdo_analytics_sample_rate => 1 => 1 datadog.pdo_analytics_sample_rate => 1 => 1 datadog.trace.phpredis_enabled => On => On datadog.trace.phpredis_analytics_enabled => Off => Off datadog.phpredis_analytics_enabled => Off => Off datadog.trace.phpredis_analytics_sample_rate => 1 => 1 datadog.phpredis_analytics_sample_rate => 1 => 1 datadog.trace.predis_enabled => On => On datadog.trace.predis_analytics_enabled => Off => Off datadog.predis_analytics_enabled => Off => Off datadog.trace.predis_analytics_sample_rate => 1 => 1 datadog.predis_analytics_sample_rate => 1 => 1 datadog.trace.slim_enabled => On => On datadog.trace.slim_analytics_enabled => Off => Off datadog.slim_analytics_enabled => Off => Off datadog.trace.slim_analytics_sample_rate => 1 => 1 datadog.slim_analytics_sample_rate => 1 => 1 datadog.trace.symfony_enabled => On => On datadog.trace.symfony_analytics_enabled => Off => Off datadog.symfony_analytics_enabled => Off => Off datadog.trace.symfony_analytics_sample_rate => 1 => 1 datadog.symfony_analytics_sample_rate => 1 => 1 datadog.trace.web_enabled => On => On datadog.trace.web_analytics_enabled => Off => Off datadog.web_analytics_enabled => Off => Off datadog.trace.web_analytics_sample_rate => 1 => 1 datadog.web_analytics_sample_rate => 1 => 1 datadog.trace.wordpress_enabled => On => On datadog.trace.wordpress_analytics_enabled => Off => Off datadog.wordpress_analytics_enabled => Off => Off datadog.trace.wordpress_analytics_sample_rate => 1 => 1 datadog.wordpress_analytics_sample_rate => 1 => 1 datadog.trace.yii_enabled => On => On datadog.trace.yii_analytics_enabled => Off => Off datadog.yii_analytics_enabled => Off => Off datadog.trace.yii_analytics_sample_rate => 1 => 1 datadog.yii_analytics_sample_rate => 1 => 1 datadog.trace.zendframework_enabled => On => On datadog.trace.zendframework_analytics_enabled => Off => Off datadog.zendframework_analytics_enabled => Off => Off datadog.trace.zendframework_analytics_sample_rate => 1 => 1 datadog.zendframework_analytics_sample_rate => 1 => 1

[morrisonlevi]

Thanks for the report, and sorry you are having issues. As a quick check, if you disable xdebug, does the crash still happen?

[antivanity]

ok xdebug caused the problem is there a way i can run both?

[labbati]

@morrisonlevi do you remember if this applies to php 5 as well? I think so, we should just enforce the check on PHP 5 also? What do you think?

[antivanity]

Any updates on this?

[labbati]

If you can provide a core dump which includes debug symbols we can look into it. Hystorically, we had issues with older versions of xdebug.

[krakjoe]

We haven't had any feedback here for over a month. It looks as if the original issue was caused or induced by an old version of xdebug, and the advice to disable or upgrade having been given it doesn't look like there is anything to do.

I'm going to close the issue, if I'm wrong to do that, please open a new issue (with debugging symbols as requested).