[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).