PHP :: Bug #71821 :: php-fpm7 crashes due to unknown entry 'log

Bug #71821	php-fpm7 crashes due to unknown entry 'log_level' in config
Submitted:	2016-03-14 12:01 UTC	Modified:	2016-03-18 20:42 UTC
From:	contact at sshilko dot com	Assigned:
Status:	Closed	Package:	mongodb (PECL)
PHP Version:	7.0.4	OS:	Ubuntu 14.04.3
Private report:	No	CVE-ID:	None

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[2016-03-14 12:01 UTC] contact at sshilko dot com

Description:
------------
$ /usr/lib/php/php7.0-fpm-checkconf
Segmentation fault (core dumped)

# gdb /usr/sbin/php-fpm7.0
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Reading symbols from /usr/sbin/php-fpm7.0...(no debugging symbols found)...done.
(gdb) run
Starting program: /usr/sbin/php-fpm7.0
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[14-Mar-2016 11:56:02] ERROR: [/etc/php/7.0/fpm/php-fpm.conf:420] unknown entry 'log_level'
[14-Mar-2016 11:56:02] ERROR: failed to load configuration file '/etc/php/7.0/fpm/php-fpm.conf'
[14-Mar-2016 11:56:02] ERROR: FPM initialization failed
zend_mm_heap corrupted
[Inferior 1 (process 3842) exited with code 01]


PHP 7.0.4-5+deb.sury.org~trusty+1 (cli) ( NTS )
Copyright (c) 1997-2016 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2016 Zend Technologies
    with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies

Test script:
---------------
echo 'log_level=warning' >> /etc/php/7.0/fpm/php-fpm.conf

$ /usr/lib/php/php7.0-fpm-checkconf
Segmentation fault (core dumped)

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[2016-03-14 12:13 UTC] ondrej@php.net

And that said script is just a simple wrapper around `php-fpm -t`:

$ cat debian/php-fpm-checkconf 
#!/bin/sh
set -e
CONFFILE=${1:-/etc/php/@PHP_VERSION@/fpm/php-fpm.conf}
errors=$(/usr/sbin/php-fpm@PHP_VERSION@ --fpm-config "$CONFFILE" -t 2>&1 | grep "\[ERROR\]" || true);
if [ -n "$errors" ]; then
    echo "Please fix your configuration file..."
    echo $errors
    exit 1
fi
exit 0

[2016-03-14 12:28 UTC] ondrej@php.net

Sergei,

what other modules do you have installed?  Could you perhaps attach output of:

php -r 'phpinfo();'

I can't reproduce it with just php-fpm and neither with basic set of modules installed nor with full php7.0-* set of external modules as provided in the PPA.  Re-running under valgrind also doesn't reveal anything suspicious.

Correctly ends with:
```
[14-Mar-2016 12:26:22] ERROR: [/etc/php/7.0/fpm/php-fpm.conf:415] unknown entry 'log_level'
[14-Mar-2016 12:26:22] ERROR: failed to load configuration file '/etc/php/7.0/fpm/php-fpm.conf'
[14-Mar-2016 12:26:22] ERROR: FPM initialization failed
[Inferior 1 (process 74801) exited with code 0116]
```

Any PECL modules (php-* packages)?

Or anything under /usr/local?  What does `ldd /usr/sbin/php-fpm7.0` output?

Can you reproduce this on clean system?  (And if not, what's the difference between the two systems?)

[2016-03-14 12:41 UTC] contact at sshilko dot com

This is a clean system i'm installing via puppet/vagrant script.
Only change i have is PHP version, i updated from 5.5 to 5.6 to 7.0.1-5+deb.sury.org~trusty+1 to 7.0.2-2+deb.sury.org~trusty+1 and now tried

7.0.4-5+deb.sury.org~trusty+1

but it failed immediattely due to log_level, after uncommenting it works.

modules & info
https://gist.github.com/sshilko/5dce14eccd90f43dea33

[2016-03-14 12:51 UTC] contact at sshilko dot com

It's Amazon AWS EC2 instance ami-b82176d2 as a base (Ubuntu 14.04.03 LTS)
ubuntu/images/ebs/ubuntu-trusty-14.04-amd64-server-20151218 - ami-b82176d2

[2016-03-15 09:23 UTC] laruence@php.net

-Status: Open +Status: Feedback

[2016-03-15 09:23 UTC] laruence@php.net

Thank you for this bug report. To properly diagnose the problem, we
need a backtrace to see what is happening behind the scenes. To
find out how to generate a backtrace, please read
http://bugs.php.net/bugs-generating-backtrace.php for *NIX and
http://bugs.php.net/bugs-generating-backtrace-win32.php for Win32

Once you have generated a backtrace, please submit it to this bug
report and change the status back to "Open". Thank you for helping
us make PHP better.

I can not reproduce this.

[2016-03-15 11:03 UTC] ondrej@php.net

I was able to reproduce it and it's a mongodb extension loaded that's causing the segfault.

root@lettie:~# echo 'log_level=warning' >> /etc/php/7.0/fpm/php-fpm.conf
root@lettie:~# php-fpm7.0 -t
[15-Mar-2016 11:01:34] ERROR: [/etc/php/7.0/fpm/php-fpm.conf:415] unknown entry 'log_level'
[15-Mar-2016 11:01:34] ERROR: failed to load configuration file '/etc/php/7.0/fpm/php-fpm.conf'
[15-Mar-2016 11:01:34] ERROR: FPM initialization failed
zend_mm_heap corrupted
root@lettie:~# phpdismod mongodb
root@lettie:~# php-fpm7.0 -t
[15-Mar-2016 11:01:41] ERROR: [/etc/php/7.0/fpm/php-fpm.conf:415] unknown entry 'log_level'
[15-Mar-2016 11:01:41] ERROR: failed to load configuration file '/etc/php/7.0/fpm/php-fpm.conf'
[15-Mar-2016 11:01:41] ERROR: FPM initialization failed
root@lettie:~# phpenmod mongodb
root@lettie:~# php-fpm7.0 -t
[15-Mar-2016 11:01:47] ERROR: [/etc/php/7.0/fpm/php-fpm.conf:415] unknown entry 'log_level'
[15-Mar-2016 11:01:47] ERROR: failed to load configuration file '/etc/php/7.0/fpm/php-fpm.conf'
[15-Mar-2016 11:01:47] ERROR: FPM initialization failed
Segmentation fault (core dumped)

I'll try to reproduce on Ubuntu Xenial, where I have dbgsym packages with debug symbols available.

[2016-03-15 11:06 UTC] ondrej@php.net

JFTR It's not caused by log_level=warning.  That just makes PHP FPM to stop early.

I can reproduce the error with mongodb loaded on every php-fpm7.0 -t run.

root@lettie:~# php-fpm7.0 -t
[15-Mar-2016 11:04:16] NOTICE: configuration file /etc/php/7.0/fpm/php-fpm.conf test is successful

Segmentation fault (core dumped)
root@lettie:~# php-fpm7.0 -t
[15-Mar-2016 11:04:17] NOTICE: configuration file /etc/php/7.0/fpm/php-fpm.conf test is successful

zend_mm_heap corrupted
root@lettie:~#

[2016-03-15 11:20 UTC] contact at sshilko dot com

-Status: Feedback +Status: Open

[2016-03-15 11:20 UTC] contact at sshilko dot com

Seems so, thanks Ondrej, i tested again

PHP 7.0.4-5+deb.sury.org~trusty+1

[11:15 AM]-[ubuntu]-[~]
$ sudo /usr/sbin/php-fpm7.0 -t; php -m |grep mongo
[15-Mar-2016 11:15:53] NOTICE: configuration file /etc/php/7.0/fpm/php-fpm.conf test is successful

zend_mm_heap corrupted
22:mongodb

[11:15 AM]-[ubuntu]-[~]
$ sudo /usr/sbin/php-fpm7.0 -t; php -m |grep mongo
[15-Mar-2016 11:15:54] NOTICE: configuration file /etc/php/7.0/fpm/php-fpm.conf test is successful

22:mongodb


its crashes every now and then with configtest,

$ sudo /usr/sbin/php-fpm7.0 -t
[15-Mar-2016 11:18:29] ERROR: [/etc/php/7.0/fpm/php-fpm.conf:421] unknown entry 'log_level'
[15-Mar-2016 11:18:29] ERROR: failed to load configuration file '/etc/php/7.0/fpm/php-fpm.conf'
[15-Mar-2016 11:18:29] ERROR: FPM initialization failed

$ grep 'log_level' /etc/php/7.0/fpm/php-fpm.conf
42:;log_level = notice
127:log_level=notice


The issue that php-fpm doesnt like "log_level" is a separate issue by itself and randomly crashes are caused by mongodb extension in 
/usr/sbin/php-fpm7.0 -t

alho the main php-fpm process works fine with mongodb extension (i dont see segfaults in syslog for past few days or so)

[2016-03-15 11:31 UTC] contact at sshilko dot com

I filed a dummy bugreport to mongodb extension jira bugtracker
https://jira.mongodb.org/browse/PHPC-632

[2016-03-15 11:35 UTC] ondrej@php.net

Ok, so this is a definitely mongodb fault. Running under valgrind reveals:

==26905== Invalid read of size 8
==26905==    at 0x3370BA: _efree (in /usr/sbin/php-fpm7.0)
==26905==    by 0xD68FB8A: digestmd5_common_mech_free (in /usr/lib/x86_64-linux-gnu/sasl2/libdigestmd5.so.2.0.25)
==26905==    by 0xC230468: client_done (in /usr/lib/x86_64-linux-gnu/libsasl2.so.2.0.25)
==26905==    by 0xC2305A9: sasl_client_done (in /usr/lib/x86_64-linux-gnu/libsasl2.so.2.0.25)
==26905==    by 0xBFE26DD: _mongoc_do_cleanup (in /usr/lib/php/20151012/mongodb.so)
==26905==    by 0x6E304E8: __pthread_once_slow (pthread_once.c:116)
==26905==    by 0x400F8C6: _dl_fini (in /lib/x86_64-linux-gnu/ld-2.22.so)
==26905==    by 0x6AB3E07: __run_exit_handlers (in /lib/x86_64-linux-gnu/libc-2.22.so)
==26905==    by 0x6AB3E54: exit (in /lib/x86_64-linux-gnu/libc-2.22.so)
==26905==    by 0x3F00B1: fpm_init (in /usr/sbin/php-fpm7.0)
==26905==    by 0x1E1D2F: main (in /usr/sbin/php-fpm7.0)
==26905==  Address 0xa200000 is 288 bytes inside a block of size 552 free'd
==26905==    at 0x4C2AE6B: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==26905==    by 0x6AE6662: fclose@@GLIBC_2.2.5 (in /lib/x86_64-linux-gnu/libc-2.22.so)
==26905==    by 0x376D15: zend_file_handle_dtor (in /usr/sbin/php-fpm7.0)
==26905==    by 0x32E9C6: zend_parse_ini_file (in /usr/sbin/php-fpm7.0)
==26905==    by 0x301D71: php_init_config (in /usr/sbin/php-fpm7.0)
==26905==    by 0x2F9FA7: php_module_startup (in /usr/sbin/php-fpm7.0)
==26905==    by 0x3F7984: ??? (in /usr/sbin/php-fpm7.0)
==26905==    by 0x1E1CD6: main (in /usr/sbin/php-fpm7.0)
==26905==  Block was alloc'd at
==26905==    at 0x4C29C0F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==26905==    by 0x6AE6F1C: __fopen_internal (in /lib/x86_64-linux-gnu/libc-2.22.so)
==26905==    by 0x301D2E: php_init_config (in /usr/sbin/php-fpm7.0)
==26905==    by 0x2F9FA7: php_module_startup (in /usr/sbin/php-fpm7.0)
==26905==    by 0x3F7984: ??? (in /usr/sbin/php-fpm7.0)
==26905==    by 0x1E1CD6: main (in /usr/sbin/php-fpm7.0)
==26905== 
==26905== Invalid read of size 4
==26905==    at 0x3370BD: _efree (in /usr/sbin/php-fpm7.0)
==26905==    by 0xD68FB8A: digestmd5_common_mech_free (in /usr/lib/x86_64-linux-gnu/sasl2/libdigestmd5.so.2.0.25)
==26905==    by 0xC230468: client_done (in /usr/lib/x86_64-linux-gnu/libsasl2.so.2.0.25)
==26905==    by 0xC2305A9: sasl_client_done (in /usr/lib/x86_64-linux-gnu/libsasl2.so.2.0.25)
==26905==    by 0xBFE26DD: _mongoc_do_cleanup (in /usr/lib/php/20151012/mongodb.so)
==26905==    by 0x6E304E8: __pthread_once_slow (pthread_once.c:116)
==26905==    by 0x400F8C6: _dl_fini (in /lib/x86_64-linux-gnu/ld-2.22.so)
==26905==    by 0x6AB3E07: __run_exit_handlers (in /lib/x86_64-linux-gnu/libc-2.22.so)
==26905==    by 0x6AB3E54: exit (in /lib/x86_64-linux-gnu/libc-2.22.so)
==26905==    by 0x3F00B1: fpm_init (in /usr/sbin/php-fpm7.0)
==26905==    by 0x1E1D2F: main (in /usr/sbin/php-fpm7.0)
==26905==  Address 0xa20065c is 4 bytes after a block of size 40 free'd
==26905==    at 0x4C2AE6B: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==26905==    by 0x32E657: ini_parse (in /usr/sbin/php-fpm7.0)
==26905==    by 0x32E9BC: zend_parse_ini_file (in /usr/sbin/php-fpm7.0)
==26905==    by 0x301D71: php_init_config (in /usr/sbin/php-fpm7.0)
==26905==    by 0x2F9FA7: php_module_startup (in /usr/sbin/php-fpm7.0)
==26905==    by 0x3F7984: ??? (in /usr/sbin/php-fpm7.0)
==26905==    by 0x1E1CD6: main (in /usr/sbin/php-fpm7.0)
==26905==  Block was alloc'd at
==26905==    at 0x4C29C0F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==26905==    by 0x3377F8: __zend_malloc (in /usr/sbin/php-fpm7.0)
==26905==    by 0x32F0BC: ini_lex (in /usr/sbin/php-fpm7.0)
==26905==    by 0x32DECE: ini_parse (in /usr/sbin/php-fpm7.0)
==26905==    by 0x32E9BC: zend_parse_ini_file (in /usr/sbin/php-fpm7.0)
==26905==    by 0x301D71: php_init_config (in /usr/sbin/php-fpm7.0)
==26905==    by 0x2F9FA7: php_module_startup (in /usr/sbin/php-fpm7.0)
==26905==    by 0x3F7984: ??? (in /usr/sbin/php-fpm7.0)
==26905==    by 0x1E1CD6: main (in /usr/sbin/php-fpm7.0)

You'll have to report this directly to mongodb folks (they have some JIRA setup).

[2016-03-15 18:36 UTC] contact at sshilko dot com

Cross linking with
https://github.com/mongodb/mongo-php-driver/issues/209

[2016-03-16 09:51 UTC] laruence@php.net

-Package: FPM related +Package: mongo

[2016-03-18 15:47 UTC] derick@php.net

-Package: mongo +Package: mongodb

[2016-03-18 20:42 UTC] contact at sshilko dot com

-Status: Open +Status: Closed

[2016-03-18 20:42 UTC] contact at sshilko dot com

mongodb 1.1.5 released with a fix

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