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Maniphest T10987

/config/issue/ causes coredump in PHP-FPM
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Description

I followed the instructions to install Phabricator with Nginx and PHP-FPM. I can view most pages on the site. However, navigating to /config/issue/ or /config/cache/ returns a 502 error and produces a core dump from PHP-FPM. Refreshing occasionally loads the cache page successfully, but I haven't been able to get to the issue page at all.

This is the output from coredumpctl info, the full dump is attached.

          PID: 9411 (php-fpm)
          UID: 1002 (phabricator)
          GID: 1003 (phabricator)
       Signal: 11 (SEGV)
    Timestamp: Wed 2016-05-18 18:57:57 PDT (13min ago)
 Command Line: php-fpm: pool phabricator                                        
   Executable: /usr/bin/php-fpm
Control Group: /system.slice/php-fpm.service
         Unit: php-fpm.service
        Slice: system.slice
      Boot ID: efc2e9db85fd4d23ae417e6bd8918baa
   Machine ID: 642ffdf69cf74d339e1a52e4b19aa577
     Hostname: highwind
     Coredump: /var/lib/systemd/coredump/core.php-fpm.1002.efc2e9db85fd4d23ae417e6bd8918baa.9411.1463623077000000000000.lz4
      Message: Process 9411 (php-fpm) of user 1002 dumped core.
               
               Stack trace of thread 9411:
               #0  0x000000000066758a _efree (php-fpm)
               #1  0x000000000047554a n/a (php-fpm)
               #2  0x00000000004758f2 n/a (php-fpm)
               #3  0x00000000004765dc n/a (php-fpm)
               #4  0x00000000006dacfd n/a (php-fpm)
               #5  0x00000000006cc01b execute_ex (php-fpm)
               #6  0x000000000071f877 zend_execute (php-fpm)
               #7  0x000000000068a2d3 zend_execute_scripts (php-fpm)
               #8  0x000000000062acb0 php_execute_script (php-fpm)
               #9  0x0000000000433a7b n/a (php-fpm)
               #10 0x00007f0b587ae741 __libc_start_main (libc.so.6)
               #11 0x0000000000434899 _start (php-fpm)
Arch Linux

nginx
    1.10.0-2
php
    7.0.6-3
php-fpm
    7.0.6-3
php-apcu
    5.1.4-1
php-apcu-bc
    1.0.3-1
php-gd
    7.0.6-3

phabricator
    90c06115e520cd94f13a1a85a4aa63c3dc9cfee0 (Fri, May 13) 
arcanist
    6d175516f54818d02b5fa7d4bc2b290123c3d27f (Sat, Apr 30) 
phutil
    a51a8b98305e08b220972483698ae6f50e77768f (Fri, May 13)
  • core.php-fpm.1002.efc2e9db85fd4d23ae417e6bd8918baa.9411.1463623077000000000000.lz46 MBDownload
  • nginx.conf1 KBDownload
  • php-fpm-phabricator.conf323 BDownload

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Event Timeline

davidism renamed this task from /config/issue/ causes core in PHP-FPM to /config/issue/ causes coredump in PHP-FPM.May 19 2016, 2:27 AM
davidism created this task.
chad added a subscriber: chad.May 19 2016, 2:39 AM

Can you reproduce this on another machine?

davidism added a comment.May 19 2016, 2:41 AM

Yes, I tried it on my work computer (same versions and configuration), and then on my home computer.

chad added a comment.May 19 2016, 2:46 AM

PHP7 is currently unsupported, I would start there and move to 5.6 or whatever you prefer.

chad added a comment.May 19 2016, 2:48 AM

D14566 might fix this? See also T9640.

chad added a subtask: T9640: Make Phabricator compatible with PHP7.May 19 2016, 4:49 PM
hach-que added a subscriber: hach-que.May 21 2016, 6:17 AM

Try disabling php-apcu and other performance related extensions. Some of them (like APC) are known to cause segfaults or other issues, so unless you actually need to have them installed, I'd suggest disabling them and see if the issue still occurs.

davidism added a comment.May 21 2016, 4:16 PM

I disabled the APC extension but still had the same issue. I'll try deploying on CentOS 7 when I have some time.

chad closed this task as a duplicate of T9640: Make Phabricator compatible with PHP7.Jun 8 2016, 4:38 PM
storrgie added a subscriber: storrgie.EditedJun 8 2016, 4:48 PM

Can confirm this on another instance with the same package versions as what is reported in original post (Arch).

storrgie added a comment.Jun 8 2016, 4:51 PM

@hach-que can you disable php-apcu from the phabricator install, or do you mean to comment it out in the php/php-fpm config?

asherkin added a subscriber: asherkin.Jun 8 2016, 7:27 PM

@davidism You probably don't want to be posting full memory core dumps publicly.

Just from a quick scan, I have:

  • Phabricator hostname / port (lucky it's all local!)
  • MySQL credentials
  • Your PHP session key (if your install was public this could compromise your account)
  • Phabricator account username
  • bcrypt-hashed Phabricator account password
  • Parts of your Phabricator config
• luca.looz92 mentioned this in T9640: Make Phabricator compatible with PHP7.Jun 9 2016, 3:05 PM
chad merged a task: T11202: 502 while access /config/issue.Jun 23 2016, 3:40 AM
chad added a subscriber: netroby.
epriestley closed subtask T9640: Make Phabricator compatible with PHP7 as Resolved.Jan 13 2017, 12:16 AM
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