nrfjprog Error -"Worker process is dead, cannot execute command" - Ubuntu Docker Container

Question

Hello, 
 I am currently trying to get our nRF52 development workflow working in a Docker container. I have been able to compile the firmware in the container and debug it using a remote JLink sever however I am unable to flash the firmware using nrfjprog whilst in the container. 
 Host: Windows 10 
 Guest: Ubuntu 20.04 - Dockerfile 
 When I run (or any nrfjprog command): 
 nrfjprog -i --log 
 I get the following error log:

[ 2022 -Jan- 31 16:13:56 ] [ info] -------------------------------------------------------------------------------- 
 [ 2022 -Jan- 31 16:13:56 ] [ info] nrfjprog -i --log 
 [ 2022 -Jan- 31 16:13:56 ] [ info] nrfjprog version 10 . 15 . 2 external 
 [ 2022 -Jan- 31 16:13:56 ] [ info] -------------------------------------------------------------------------------- 
 [ 2022 -Jan- 31 16:13:56 ] [ info] Load library at /opt/nrf-command-line-tools/lib/libnrfjprogdll.so. 
 [ 2022 -Jan- 31 16:13:56 ] [ info] Library loaded, loading member functions. 
 [ 2022 -Jan- 31 16:13:56 ] [ info] Member functions succesfully loaded. 
 [ 2022 -Jan- 31 16:13:56 ] [debug] [ Client] - open 
 [ 2022 -Jan- 31 16:13:56 ] [debug] [ Client] - start 
 [ 2022 -Jan- 31 16:13:56 ] [error] [ Client] - Worker process is dead, cannot execute command. 
 [ 2022 -Jan- 31 16:13:56 ] [debug] [ Client] - terminate

The error is the same as seen on the nrfjprog not working on raspberry pi 4 post but the solution of "LANGUAGE=en nrfjprog -i" did not work for me. 
 
 I was wondering if anyone else has come across this issue and found a solution? 
 
 Many thanks, 
 
 Archie

user113126 · Accepted Answer

Hi Dejan, 
 That fixed it. 
 I added the following to my dockerfile:

RUN apt-get install -y locales

RUN sed -i '/en_GB.UTF-8/s/^# //g' /etc/locale.gen && \ 
 locale-gen 
 ENV LANG en_GB.UTF-8 
 ENV LANGUAGE en_GB:en 
 ENV LC_ALL en_GB.UTF-8

And now it seems to be working. 
 Thank you for your help. 
 Best, 
 Archie

user78543 · Answer

Had a very similar issue on my Linux machine: 
 $ nrfjprog --version --log
ERROR: [ Client] - Worker process is dead, cannot execute command.
ERROR: An internal error has occurred, please try again. 
 Problem was my LANG env variable, which was set to en_CH.UTF-8, but for which I had no locales generated for. Looks like this in strace: 
 openat(AT_FDCWD, "/usr/lib/locale/en_CH.UTF-8/LC_CTYPE", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/locale/en_CH.utf8/LC_CTYPE", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/locale/en_CH/LC_CTYPE", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/locale/en.UTF-8/LC_CTYPE", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/locale/en.utf8/LC_CTYPE", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/locale/en/LC_CTYPE", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
futex(0x7f60445471e0, FUTEX_WAKE_PRIVATE, 2147483647) = 0
write(2, "ERROR: [ Client] - Worker proces"..., 67ERROR: [ Client] - Worker process is dead, cannot execute command. 
 Worked around the issue by unsetting LANG: 
 $ LANG= nrfjprog --version
nrfjprog version: 10.15.3 external
JLinkARM.dll version: 7.64c

nrfjprog Error -"Worker process is dead, cannot execute command" - Ubuntu Docker Container

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