"bus error" in k8s

[MichaelSp]

After updating to

• kubernetes 1.26.4
• nextcloud 26.0.1-apache

I get this error message

AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 2001:cafe:42::249f. Set the 'ServerName' directive globally to suppress this message
AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 2001:cafe:42::249f. Set the 'ServerName' directive globally to suppress this message
Bus error

I had to set opcache.enable=0 the following line to fix this https://github.com/nextcloud/docker/blob/2d8f990304e76071602375a197b65692fa2de69a/24/apache/Dockerfile#L95 I found the pointer to this here: https://github.com/phpmyadmin/docker/issues/193

btw: I'm using a fork of https://github.com/nextcloud/helm

[joshtrichards]

Are you asking for something here or just getting this noted in case someone has the same issue and searches for it?

This seems to either be a Kubernetes or an upstream matter, no? Or, from the looks of your fork patch, perhaps something applicable to the nc-helm project, but not here.

Disabling opcache for everyone else using this Docker image is almost certainly a nonstarter. :)

[MichaelSp]

I completely agree. Disabling opchache is not a good solution. I was not recommending that. I'd consider this a bug report and wanted to see if someone has the same issue and has a better solution.

Meanwhile I also figured out that I had very high CPU-usage (I was hacked and there was a crypto-miner running). But I would still consider this a bug, because the docker container should start properly even under high system load.

If you (or someone else? Maintainer?) don't want to follow up on this, feel free to close this issue. Having that documented for posterity is already something.

[joshtrichards]

Related it seems: #1859

[trunet]

I'm having this on the fpm image.

I strace php-fpm and got:

open("/tmp/.ZendSem.BLocAD", O_RDWR|O_CREAT|O_EXCL|O_LARGEFILE, 0600) = 3
fchmod(3, 0666)                         = 0
fcntl(3, F_GETFD)                       = 0
fcntl(3, F_SETFD, FD_CLOEXEC)           = 0
unlink("/tmp/.ZendSem.BLocAD")          = 0
open("/proc/self/maps", O_RDONLY|O_LARGEFILE) = 4
read(4, "55a77b400000-55a77b513000 r--p 0"..., 1024) = 1024
lseek(4, -281, SEEK_CUR)                = 743
close(4)                                = 0
mmap(0x55a77d800000, 268435456, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_FIXED|MAP_ANONYMOUS|MAP_HUGETLB, -1, 0) = 0x55a77d800000
--- SIGBUS {si_signo=SIGBUS, si_code=BUS_ADRERR, si_addr=0x55a77d800000} ---
+++ killed by SIGBUS +++
Bus error

php-fpm (opcache in reality) also uses HUGETLB, the helm chart documentation needs to be updated to mention fpm image as well instead of only apache version. both fpm and fpm-alpine. If I disable opcache, it works fine.

However the best alternative is to enable hugepages on fpm as well. https://github.com/nextcloud/helm/tree/main/charts/nextcloud#hugepages