Segfault on python math.exp in ppc64le ubuntu:18.04 image

[kaczmarj]

Cross-posted to StackOverflow and Ubuntu bug reporter.

When calculating the exponential of a negative number in python 3.6 with the Ubuntu 18.04 Docker image (ppcle64), I receive a segfault.

python3 -c "import math; math.exp(-1)"
qemu: uncaught target signal 11 (Segmentation fault) - core dumped
Segmentation fault

I am running this in Docker for Mac. Here are the steps to reproduce the error.

docker run --rm -it --platform linux/ppc64le ubuntu:18.04
apt-get update -qq && apt-get install -y -qq python3
python3 -c "import math; print(math.exp(0))" # 1.0
python3 -c "import math; print(math.exp(-0))" # 1.0
python3 -c "import math; print(math.exp(1))" # 2.718281828459045
python3 -c "import math; print(math.exp(-1))"

This error does not happen when using the debian:10 or alpine images. It also does not happen on a real ppc64le machine:

[jakubk@service0002 ~]$ uname -m
ppc64le
[jakubk@service0002 ~]$ python3 -c "import math; print(math.exp(-1))"
0.36787944117144233

Here is the output of docker version on my machine:

Client: Docker Engine - Community
 Version: 19.03.8
 API version: 1.40
 Go version: go1.12.17
 Git commit: afacb8b
 Built: Wed Mar 11 01:21:11 2020
 OS/Arch: darwin/amd64
 Experimental: true

Server: Docker Engine - Community
 Engine:
  Version: 19.03.8
  API version: 1.40 (minimum version 1.12)
  Go version: go1.12.17
  Git commit: afacb8b
  Built: Wed Mar 11 01:29:16 2020
  OS/Arch: linux/amd64
  Experimental: true
 containerd:
  Version: v1.2.13
  GitCommit: 7ad184331fa3e55e52b890ea95e65ba581ae3429
 runc:
  Version: 1.0.0-rc10
  GitCommit: dc9208a3303feef5b3839f4323d9beb36df0a9dd
 docker-init:
  Version: 0.18.0
  GitCommit: fec3683

Could this be a bug in Docker's qemu?

[tonistiigi]

This seems to work fine on latest qemu both on Intel and arm hosts so closing.