Error when emulating linux/amd64 on ppc64le host

[mgiessing]

I got a problem when running --platform linux/amd64 builds on an IBM Power (ppc64le) host. ARM64 doesn't seem to have this problem when emulated.

First my the setup:

• Installed docker:

  dnf config-manager --add-repo=https://download.docker.com/linux/centos/docker-ce.repo
  dnf install docker-ce docker-ce-cli -y

• Installed buildx:

  wget https://github.com/docker/buildx/releases/download/v0.9.1/buildx-v0.9.1.linux-ppc64le-O ~/.docker/cli-plugins/docker-buildx
  chmod +x ~/.docker/cli-plugins/docker-buildx 

• Install binfmt

  docker run --rm --privileged tonistiigi/binfmt:latest --install all
  docker buildx create --name mybuilder --use --bootstrap

• Check environment

  
  $ uname -m
  ppc64le

$ docker --version Docker version v20.10.21, build baeda1f

$ docker buildx version github.com/docker/buildx v0.9.1 ed00243a0ce2a0aee75311b06e32d33b44729689

$ docker buildx ls NAME/NODE DRIVER/ENDPOINT STATUS BUILDKIT PLATFORMS mybuilder * docker-container
mybuilder0 unix:///var/run/docker.sock running v0.10.5 linux/ppc64le, linux/amd64, linux/amd64/v2, linux/arm64, linux/riscv64, linux/s390x, linux/mips64le, linux/mips64 default docker
default default running v20.10.21 linux/ppc64le, linux/amd64, linux/arm64, linux/riscv64, linux/s390x, linux/386, linux/arm/v7, linux/arm/v6

## Simple dockerfile to reproduce

```dockerfile
FROM almalinux:8.6
RUN dnf update -y && dnf install vim -y

The error

When I build for ppc64le and arm64 using these commands it works:

docker buildx build --load --platform linux/ppc64le -t test-alma:ppc64le -f Dockerfile.alma .
docker buildx build --load --platform linux/arm64 -t test-alma:arm64 -f Dockerfile.alma .

However when I want to build for x86/amd64 using this command:

docker buildx build --load --platform linux/amd64 -t test-alma:amd64 -f Dockerfile.alma .

I'm getting this error:

[...]
 > [2/2] RUN dnf update -y && dnf install vim -y:                                                                                                                                       
#0 2.191 Traceback (most recent call last):                                                                                                                                             
#0 2.191   File "/usr/lib64/python3.6/site-packages/libdnf/error.py", line 14, in swig_import_helper                                                                                    
#0 2.191     return importlib.import_module(mname)                                                                                                                                      
#0 2.191   File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module                                                                                                
#0 2.191     return _bootstrap._gcd_import(name[level:], package, level)
#0 2.191   File "<frozen importlib._bootstrap>", line 994, in _gcd_import
#0 2.191   File "<frozen importlib._bootstrap>", line 971, in _find_and_load
#0 2.191   File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
#0 2.191   File "<frozen importlib._bootstrap>", line 658, in _load_unlocked
#0 2.191   File "<frozen importlib._bootstrap>", line 571, in module_from_spec
#0 2.191   File "<frozen importlib._bootstrap_external>", line 922, in create_module
#0 2.191   File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
#0 2.191 ImportError: libgmp.so.10: ELF load command alignment not page-aligned
#0 2.191 
#0 2.191 During handling of the above exception, another exception occurred:
#0 2.191 
#0 2.191 Traceback (most recent call last):
#0 2.191   File "/usr/bin/dnf", line 57, in <module>
#0 2.191     from dnf.cli import main
#0 2.191   File "/usr/lib/python3.6/site-packages/dnf/__init__.py", line 30, in <module>
#0 2.191     import dnf.base
#0 2.191   File "/usr/lib/python3.6/site-packages/dnf/base.py", line 29, in <module>
#0 2.191     import libdnf.transaction
#0 2.191   File "/usr/lib64/python3.6/site-packages/libdnf/__init__.py", line 8, in <module>
#0 2.191     from . import error
#0 2.191   File "/usr/lib64/python3.6/site-packages/libdnf/error.py", line 17, in <module>
#0 2.191     _error = swig_import_helper()
#0 2.191   File "/usr/lib64/python3.6/site-packages/libdnf/error.py", line 16, in swig_import_helper
#0 2.191     return importlib.import_module('_error')
#0 2.191   File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
#0 2.191     return _bootstrap._gcd_import(name[level:], package, level)
#0 2.191 ModuleNotFoundError: No module named '_error'
------
Dockerfile.alma:2
--------------------
   1 |     FROM almalinux:8.6
   2 | >>> RUN dnf update -y && dnf install vim -y
   3 |     
   4 |     
--------------------
ERROR: failed to solve: process "/bin/sh -c dnf update -y && dnf install vim -y" did not complete successfully: exit code: 1

Running a simple container with --platform linux/amd64 seems to work:

$ docker run -ti --platform linux/amd64 almalinux:8.6 uname -m
x86_64

Any idea how to fix this issue? Is this related to binfmt or to AlmaLinux?

Thanks!

[mgiessing]

Just for consistency: I tried the same procedure on an x86_64 host and there everything works just fine, i.e. I can build amd64/ppc64le/arm64 without issues.