Segmentation fault when building Symfony cache on Alpine

[dunglas]

Description

When building the Symfony cache using FrankenPHP and PHP ZTS provided by the official Alpine PHP image, a segmentation fault occurs on this line: https://github.com/symfony/symfony/blob/517128f8795d28990134010259585c6d623d087f/src/Symfony/Component/ErrorHandler/DebugClassLoader.php#L296

Symfony basically includes a lot of files to build the Dependency Injection Container cache, but this always fails on the same class/file:

<?php

include '/app/vendor/composer/../symfony/framework-bundle/DependencyInjection/Configuration.php';

The issue occurs with Alpine but not with the Debian image. It happens even if opcache is disabled or not installed.

Quick reproducer:

composer create-project symfony/skeleton reproducer
cd reproducer
docker run -p 80:80 -p 443:443 -v $PWD:/app dunglas/frankenphp:latest-alpine

PHP Version

PHP 8.2.10 ZTS

Operating System

Alpine Linux 3.18

[ndossche]

I'm not getting a segfault. Are you able to provide a backtrace?
Also, do you have a reproducer that does not depend on FrankenPHP?

[dunglas]

@nielsdos what system are you using? We reproduced on hosts running on Mac (Apple Silicon) as well as Linux (amd64).
Also, can you try to edit the config or create a file in src/ to ensure that Symfony triggers a cache rebuild?

Usually, you wont see the segfault directly, the server will just be "blocked", but using GDB you can see the segfault occurring in libphp.so.

Unfortunately, I don't know how to reproduce without FrankenPHP. To have similar conditions, we need to be in a multi-threaded web context. It may be possible to create a similar setup with Apache or NGINX Unit but I'm not. It's also possible that the problem is caused by bad interactions with the Go runtime, but as it works on Debian that's not sure.

[dunglas]

Here is a GDB backtrace (unfortunately it isn't very readable because there are no official images containing debug symbols). I'll try to compile on Alpine with debug symbols ASAP.

This looks like an infinite loop in compile_file():

Back trace

[New LWP 42] [New LWP 43] [New LWP 44] [New LWP 45] [New LWP 46] [New LWP 47]

Thread 13 "thpool-0" received signal SIGSEGV, Segmentation fault.
[Switching to LWP 42]
0x0000fffff7466430 in ?? () from /usr/local/lib/libphp.so
(gdb) bt
#0 0x0000fffff7466430 in ?? () from /usr/local/lib/libphp.so
#1 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#2 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#3 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#4 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#5 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#6 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#7 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#8 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#9 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#10 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#11 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#12 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#13 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#14 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#15 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#16 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#17 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#18 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#19 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#20 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#21 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#22 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#23 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#24 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#25 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#26 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#27 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#28 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#29 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#30 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#31 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#32 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#33 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#34 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#35 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#36 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#37 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#38 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#39 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#40 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#41 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#42 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#43 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#44 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#45 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#46 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#47 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#48 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#49 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#50 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#51 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#52 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#53 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#54 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#55 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#56 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#57 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#58 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#59 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#60 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#61 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#62 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#63 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#64 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#65 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#66 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#67 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#68 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#69 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#70 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#71 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#72 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#73 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#74 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#75 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#76 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#77 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#78 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#79 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#80 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#81 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#82 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#83 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#84 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#85 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#86 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#87 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#88 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#89 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#90 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#91 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#92 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#93 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#94 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#95 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#96 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#97 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#98 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#99 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#100 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#101 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#102 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#103 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#104 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#105 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#106 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#107 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#108 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#109 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#110 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#111 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#112 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#113 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#114 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#115 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#116 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#117 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#118 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#119 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#120 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#121 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#122 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#123 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#124 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#125 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#126 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#127 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#128 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#129 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#130 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#131 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#132 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#133 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#134 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#135 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#136 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#137 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#138 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#139 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#140 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#141 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#142 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#143 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#144 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#145 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#146 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#147 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#148 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#149 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#150 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#151 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#152 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#153 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#154 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#155 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#156 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#157 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#158 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#159 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#160 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#161 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#162 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#163 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#164 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#165 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#166 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#167 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#168 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#169 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#170 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#171 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#172 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#173 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#174 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#175 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#176 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#177 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#178 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#179 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#180 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#181 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#182 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#183 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#184 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#185 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#186 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#187 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#188 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#189 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#190 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#191 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#192 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#193 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#194 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#195 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#196 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#197 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#198 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#199 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#200 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#201 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#202 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#203 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#204 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#205 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#206 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#207 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#208 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#209 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#210 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#211 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#212 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#213 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#214 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#215 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#216 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#217 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#218 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#219 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#220 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#221 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
#222 0x0000fffff74667b4 in ?? () from /usr/local/lib/libphp.so
#223 0x0000fffff7461168 in ?? () from /usr/local/lib/libphp.so
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[dunglas]

I just tried with a custom Alpine image having the debug symbols (php/frankenphp#217), and I cannot reproduce the issue. The only difference I can see between both images is that ours is using the PHP-8.2 dev branch and that official Alpine images set some CFLAGS that we don't (I'll see what happens if I add them). That will not be easy to debug :D

[dunglas]

With the official PHP 8.3 Alpine image, we get an error message:

Fatal error:  Maximum call stack size of 83792 bytes reached during compilation. Try splitting expression in /app/vendor/symfony/framework-bundle/DependencyInjection/Configuration.php on line 351

The "relevant" lines:

    private function addWorkflowSection(ArrayNodeDefinition $rootNode): void
    {
        $rootNode
            ->fixXmlConfig('workflow')
            ->children()
                ->arrayNode('workflows')

[dunglas]

Setting the same CFLAGS as in the official image in the image with debug symbols doesn't change anything: the problem doesn't occur unlike with official images.

[ndossche]

I found on Google that the default thread stack size for Alpine is lower than for other distros. So perhaps there's not actually an infinite recursion bug (or something else that takes a lot of stack space), but the stack size is just too small. Can you try overriding the thread stack size and see if that (consistently) helps?

what system are you using?

Linux amd64, nothing special really...

[dunglas]

Thanks for the lead @nielsdos, it's indeed a problem related to the default thread stack size on Alpine (I was aware of this difference but didn't think about it when it's actually obvious... sorry).

After reading this very interesting article from @kaniini, I managed to mitigate the issue with FrankenPHP: php/frankenphp#223

However, I wonder if this shouldn't also be fixed in php-src by moving the offending variable (which one?) off the stack. Feel free to close if you think that's not necessary.

Cheers, and thanks again!