OX X Error failed to write 451: write /sys/fs/cgroup ...

[Fenikkusu]

I have an issue I cannot identify and need some help from the greater hive mind.

#0 building with "builder" instance using docker-container driver
#1 [internal] booting buildkit
#1 starting container buildx_buildkit_builder0
#1 starting container buildx_buildkit_builder0 0.2s done
#1 ERROR: Error response from daemon: failed to create task for container: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: unable to apply cgroup configuration: failed to write 451: write /sys/fs/cgroup/docker/buildx/646678eeb70b2719b692fd1296ff6cf619c02c5d2f159a1c70e5a3c6f050755b/cgroup.procs: no such file or directory: unknown

[internal] booting buildkit:

ERROR: Error response from daemon: failed to create task for container: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: unable to apply cgroup configuration: failed to write 451: write /sys/fs/cgroup/docker/buildx/646678eeb70b2719b692fd1296ff6cf619c02c5d2f159a1c70e5a3c6f050755b/cgroup.procs: no such file or directory: unknown

With the error out of the way, here is the background. I develop on an Apple M1 ARM. I am running Sonoma 14.5 with Rancher Desktop 1.14.1. All of my host servers are amd64. Normally, the RD amd64 emulation works. Even when it does work, I prefer to work with arm64 images. I use GitLab Runner for my CI/CD. I have an instance running on the formal amd64 architecture and this works great. I am running GitLab Runner on my laptop to help build the arm images. This ultimately works...except for the actual build command. When GitLab runner kicks off right now, I am getting the above error. If I take the raw docker buildx build ... as generated by the CI/CD, the command succeeds and works fine. It only does this when running through/via the Helm Chart that is trying to run the DinD Qemu Configuration. I am using the image nofusscomputing/docker-buildx-qemu:0.3.0 as the image that the charts are using to run the subsequent docker buildx build command, though I am considering building my own qemu image (just haven't gotten that far yet).

[Fenikkusu]

So I appear to have figured this out, though I didn't discover the underlying cause. My GitLab Runner was mounting /sys/fs/cgroup from the host Lima VM into the running container. When I disabled this, everything started working correctly. Some of the other things I tried included:

• Building a custom QEMU image
• Adjusting the Build Process to pre-install QEMU configurations
• Using straight Docker Build

The thing that finally worked was removing the mount.