Hi,
to be sure - this is qemu-tcg (emulation) for ppc64 right?
We hit quite some issues when glibc added new instructions, that qemu-
tcg could not run it anymore. Newer qemu fixed that just to see 20.04
added even more instrcutions that now fail now. But the lessons learned
is that TCG on ppc64 is often a bit behind, so trying the very latest
qemu often helps.
Which qemu did you use - I assume just the one of 18.04.
If you can try the builds from Ubuntu cloud archive which are for 18.04:
$ add-apt-repository cloud-archive:ussuri-proposed
** Changed in: qemu (Ubuntu)
Status: New => Incomplete
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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to python3-defaults in
Ubuntu.
https://bugs.launchpad.net/bugs/1871451
Title:
powerpc segfault on exponential of negative in python
Status in cloud-images:
Invalid
Status in python3-defaults package in Ubuntu:
New
Status in qemu package in Ubuntu:
Incomplete
Bug description:
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 on macOS. 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.
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
```
Cross-posted to StackOverflow:
https://stackoverflow.com/questions/61084969/python-segfault-
calculating-exponential-of-negative-ppc64le
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