Unable to determine Composer vendor-dir setting

[Till Krüss]

We're seeing strange crashes during boot. I can't make sense of the other two issues with the same error message.

2021-05-27T17:38:34.408021+00:00 heroku[web.1]: Starting process with command `vendor/bin/heroku-php-nginx -C nginx.conf web/`
2021-05-27T17:38:37.763082+00:00 app[web.1]: [heroku-exec] Starting
2021-05-27T17:38:38.208986+00:00 app[web.1]: Unable to determine Composer vendor-dir setting; is 'composer' executable on path or 'composer.phar' in current working directory?
2021-05-27T17:38:38.278000+00:00 heroku[web.1]: Process exited with status 1
2021-05-27T17:38:38.346112+00:00 heroku[web.1]: State changed from starting to crashed

Also during builds.

-----> Build succeeded!
-----> PHP app detected
-----> Bootstrapping...
-----> Installing platform packages...
       - zstd (1.4.9)
       - php (7.4.19)
       - ext-bcmath (bundled with php)
       - ext-exif (bundled with php)
       - ext-gd (bundled with php)
       - ext-mbstring (bundled with php)
       - ext-pcntl (bundled with php)
       - lz4 (1.9.3)
       - liblzf (3.6)
       - ext-msgpack (2.1.2)
       - ext-igbinary (3.2.2)
       - ext-relay (0.1.0)
       - ext-redis (5.3.4)
       - ext-imagick (3.4.4)
       - apache (2.4.46)
       - nginx (1.18.0)
       - composer (2.0.13)
-----> Installing dependencies...
       Composer version 2.0.13 2021-04-27 13:11:08
/tmp/codon/tmp/buildpacks/49830eb7d567d754bbb44099860d3e4d9f3cdaaf/bin/compile: line 603:  4322 Segmentation fault      composer config --no-plugins -g --unset github-oauth.github.com &> /dev/null

[David Zülke]

Something is crashing. I'd say 99% chance it's one of your custom extensions ;)

The same segfault might also occur at startup, causing composer config vendor-dir to fail.

If you still have an affected dyno that crashes this way, you can heroku run bash in and run composer config vendor-dir to see what the issue is - most likely a segfault as well causing PHP to crash.

[Till Krüss]

Thanks David!