Bug#961725: libopenblas-dev: On some cpus, openmp and pthread dead-lock

[Dirk Eddelbuettel]

On 29 May 2020 at 01:13, Mo Zhou wrote:
| Control: severity -1 important
| Control: tags -1 +moreinfo
| Clarification: possibly a Ubuntu bug

You may be right!  I just double checked the earliest report (on the
r-sig-debian list) and it too was on Ubuntu 20.04!

| Hello guys,
| 
| The way to reproduce with docker + ubuntu devel (20.10)
| 
| 1. docker image pull ubuntu:devel
| 2. docker run -ti ubuntu:devel
| 3. apt update -y ; apt upgrade -y
| 4. apt install -y r-base-core
| 5. Rscript -e "example(solve)"  # good with netlib
| 6. apt install -y libopenblas-dev
| 7. Rscript -e "example(solve)"  # hang
| 
| The way to reproduce with nspawn/chroot + ubuntu focal (20.04)
| if you don't have docker
| 
| 1. mkdir Focal
| 2. debootstrap focal Focal/
| 3. systemd-nspawn -D Focal
| 4. apt update -y; apt upgrade -y
| 5. apt install -y r-base-core
| 6. Rscript -e "example(solve)"  # good with netlib
| 7. apt install -y libopenblas-dev
| 8. Rscript -e "example(solve)"  # hang
| 
| The way to reproduce with *. + debian
| 
| 1. Not yet reproducible.

That is ... interesting.

Dirk

-- 
http://dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org