php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login
Bug #80321 Segfault with standard Symfony demo app
Submitted: 2020-11-05 11:58 UTC Modified: 2020-11-05 13:12 UTC
From: phil at phil-taylor dot com Assigned:
Status: Closed Package: opcache
PHP Version: 8.0.0RC3 OS: Alpine in docker
Private report: No CVE-ID: None
Welcome back! If you're the original bug submitter, here's where you can edit the bug or add additional notes.
If you forgot your password, you can retrieve your password here.
Password:
Status:
Package:
Bug Type:
Summary:
From: phil at phil-taylor dot com
New email:
PHP Version: OS:

 

 [2020-11-05 11:58 UTC] phil at phil-taylor dot com
Description:
------------
forked from https://github.com/symfony/symfony/issues/38997

When PHP8RC3 is enabled in FPM mode, with preload enabled using Symfony 5.1.7 (or Symfony 5), when a page loads, and PHP accesses the Cache Pool randomly named folders, PHP Segfaults and crashes. 

Reproducible with a bare, new, Symfony demo app.

Test script:
---------------
Install PHP 8.0.0 RC 3 (However you wish, mine was a docker container)
Install Symfony CLI binary

symfony new --demo my_project
edit .env set ENV=prod
php bin/console cache:clear

Edit php.ini and set (note your path & user might be different)

[opcache]
opcache.enable=1
opcache.preload='/application/var/cache/prod/App_KernelProdContainer.preload.php';
opcache.preload_user=www-data

cd my_project/public
php -S 0.0.0.0:8000
Try to load a webpage

Expected result:
----------------
No Segfault - page loads.

Actual result:
--------------
see screenshot: https://user-images.githubusercontent.com/400092/98182889-c4f74d00-1efe-11eb-8d3e-930d67df7d88.png

"Segmentation Fault"

see screenshot: https://user-images.githubusercontent.com/400092/98183196-93cb4c80-1eff-11eb-8a00-4d03e02551be.png


When tracing the process I get to:

SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x10}

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2020-11-05 12:03 UTC] cmb@php.net
That might have the same cause as bug #80307.  Could you try with
a current Git snapshot?
 [2020-11-05 13:11 UTC] phil at phil-taylor dot com
Im pleased to report, after compiling PHP from git sources, in Alpine Docker containers, and running PHP 8.1.0-dev with my massive Symfony 4.4.16 application, with PHP Preloading enabled, and JIT Enabled, this bug seems resolved and PHP doesn't segfault.

It seems this has been fixed since PHP8.0RC3 :-) 

You can also take this as a vote of confidence that bug #80307 fix has been tested and works. 

Thanks.
 [2020-11-05 13:12 UTC] phil at phil-taylor dot com
-Status: Open +Status: Closed
 [2020-11-05 13:12 UTC] phil at phil-taylor dot com
Closing... Thank you...
 
PHP Copyright © 2001-2024 The PHP Group
All rights reserved.
Last updated: Sun Dec 22 01:01:30 2024 UTC