Php-fpm child process crash when installing / updating an app (on raspberry pi 5)

[mathieu-margier]

Issue

I've noticed that each time I try to install and/or update an app from the web interface, I get the "502: Bad gateway" error for any subsequent requests. When looking at the nextcloud's container logs, it stays the child processes are constantly crashing:

May 12 11:22:00 nextcloud_app[1087224]: [12-May-2026 09:22:00] WARNING: [pool www] child 181 exited on signal 11 (SIGSEGV - core dumped) after 56.485757 seconds from start
May 12 11:22:00 nextcloud_app[1087224]: [12-May-2026 09:22:00] NOTICE: [pool www] child 205 started
May 12 11:22:01 nextcloud_app[1087224]: [12-May-2026 09:22:01] WARNING: [pool www] child 178 exited on signal 11 (SIGSEGV - core dumped) after 214.245756 seconds from start
May 12 11:22:01 nextcloud_app[1087224]: [12-May-2026 09:22:01] NOTICE: [pool www] child 206 started
May 12 11:22:02 nextcloud_app[1087224]: [12-May-2026 09:22:02] WARNING: [pool www] child 204 exited on signal 11 (SIGSEGV - core dumped) after 19.482163 seconds from start
May 12 11:22:02 nextcloud_app[1087224]: [12-May-2026 09:22:02] NOTICE: [pool www] child 207 started
May 12 11:22:02 nextcloud_app[1087224]: [12-May-2026 09:22:02] WARNING: [pool www] child 205 exited on signal 11 (SIGSEGV - core dumped) after 2.076329 seconds from start
May 12 11:22:02 nextcloud_app[1087224]: [12-May-2026 09:22:02] NOTICE: [pool www] child 208 started
May 12 11:22:03 nextcloud_app[1087224]: [12-May-2026 09:22:03] WARNING: [pool www] child 206 exited on signal 11 (SIGSEGV - core dumped) after 2.357498 seconds from start
May 12 11:22:03 nextcloud_app[1087224]: [12-May-2026 09:22:03] NOTICE: [pool www] child 209 started
May 12 11:22:32 nextcloud_app[1087224]: [12-May-2026 09:22:32] WARNING: [pool www] child 209 exited on signal 11 (SIGSEGV - core dumped) after 29.095544 seconds from start
May 12 11:22:32 nextcloud_app[1087224]: [12-May-2026 09:22:32] NOTICE: [pool www] child 210 started

If I restart the nextcloud (php) container, the child process no longer crashes, and the bad gateway error is gone. The app is also correctly installed/updated.

Workaround

When looking for similar issues, I found this Github issue.
They say that OPCache's JIT is not recommended for other architectures than x64, and might be causing the issue.

So, to disable OPCache's JIT, I added the following file, and mounted it as a read-only volume at /usr/local/etc/php/conf.d/tweaks-disable-opcache-jit.ini:

opcache.jit=0
opcache.jit_buffer_size=0

It indeed solved my issue.

Maybe the opcache's JIT should be disabled for non-x64 architecture to avoid troubles ?

Setup

Nextcloud server is running on podman, with raspberry pi 5 (aarch64 / arm64) as host system.
Containers are managed using podman quadlet (systemd services), with the nextcloud:33-fpm image, and postgresql database.

Details

Result of occ config:list system :

{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "serverid": "0",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": ["***REDACTED**"],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "pgsql",
        "version": "33.0.3.2",
        "overwrite.cli.url": "***REDACTED**",
        "htaccess.RewriteBase": "\/",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "filelocking.enabled": true,
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "memcache.local": "\\OC\\Memcache\\APCu",
        "memcache.distributed": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "password": "***REMOVED SENSITIVE VALUE***",
            "port": 6379
        },
        "maintenance": false,
        "default_phone_region": "FR",
        "theme": "",
        "loglevel": 2,
        "log_rotate_size": 10485760,
        "app_install_overwrite": [
            "integration_whiteboard",
            "files_markdown",
            "news"
        ],
        "maintenance_window_start": 1,
        "apps_paths": [
            {
                "path": "\/var\/www\/html\/apps",
                "url": "\/apps",
                "writable": false
            },
            {
                "path": "\/var\/www\/html\/custom_apps",
                "url": "\/custom_apps",
                "writable": true
            }
        ],
        "upgrade.disable-web": true,
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "smtp",
        "mail_sendmailmode": "smtp",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "25",
        "mail_smtpauth": true,
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpstreamoptions": {
            "ssl": {
                "verify_peer": false,
                "verify_peer_name": false
            }
        },
        "data-fingerprint": "1a0aa84bb341d90c17e4bea6ac46e19e"
    }
}

Quadlet files (equivalent to a docker compose) :

nextcloud.pod

[Unit]
Description=Pod nextcloud
After=collabora_code.container

[Pod]
PodName=nextcloud
PublishPort=8001:80

[Service]
Restart=always

[Install]
# Start by default on boot
WantedBy=multi-user.target default.target

nextcloud_db.container

[Unit]
Description=Nextcloud DB (postgres)

[Container]
ContainerName=nextcloud_db
Pod=nextcloud.pod
Image=docker.io/library/postgres:17
AutoUpdate=registry
Volume=/opt/db/nextcloud/postgres:/var/lib/postgresql/data
EnvironmentFile=/home/nextcloud/container/.env

[Service]
Restart=always

nextcloud_redis.container

[Unit]
Description=Nextcloud cache (redis)

[Container]
ContainerName=nextcloud_redis
Pod=nextcloud.pod
Image=docker.io/library/redis
AutoUpdate=registry

[Service]
Restart=always

nextcloud_app.container

[Unit]
Description=Main nextcloud container
Requires=nextcloud_db.container
After=nextcloud_db.container
Requires=nextcloud_redis.container
After=nextcloud_redis.container

[Container]
ContainerName=nextcloud_app
Pod=nextcloud.pod
Image=docker.io/library/nextcloud:33-fpm
AutoUpdate=registry
Volume=/opt/data/nextcloud/data:/var/www/html
EnvironmentFile=/home/nextcloud/container/.env
Environment=POSTGRES_HOST=localhost
Environment=REDIS_HOST=localhost

[Service]
Restart=always