There is something wrong with the Debian kernel that breaks it on sparc64. Building an upstream kernel works, but any of the around 80 patches in the Debian kernel is causing problems.
Sorry if this may be a stupid question, but do you think it's the patches or could it be something in the kernel config?
I don't really have the capacity at the moment to find out what's wrong which is why I'm using upstream kernels on all of the buildds at the moment. Sorry,
No worries, thank you for all the work!