What does CANCELED mean amongst build steps and should I worry?

[jeffrson]

Hi,
I'm trying to build images for two platforms: linux/amd64 and linux/arm64
Now when I run docker buildx build sometimes I get CANCELED for one of those platforms, sometimes for the other:

#9 [linux/arm64 builder 2/5] WORKDIR /usr/src/app
#9 CANCELED

#11 [linux/amd64 builder 2/5] WORKDIR /usr/src/app
#11 CANCELED

Should I'll be worried about this?

[tonistiigi]

Should I'll be worried about this?

No, but if you have a reproducer you can post it and we can take a look what condition causes it. This can happen when buildkit runs two steps in parallel but then realizes after some event that one of them is not needed anymore because of a cache match further ahead. Then it cancels the other step. Normally we have protections for detecting such cases so you wouldn't see this often.

We have been seeing some new reports of this after introducing mergeop so maybe you are using it as well? But nobody has provided a reproducer afaik.

[jeffrson]

Thanks you for those hints and information!

I'll see if I could find a repro.