"vcs pull" gets stuck indefinitely

[MicheleImbrianiRiACT]

When executing "vcs pull" and "vcs import", it sometimes gets stuck indefinitely during the process.
This happens sporadically and I have not been able to find any direct cause, nor a way to consistently reproduce this issue.
In my usage, it happens right after having built a docker image, and trying to import git repositories on my local device.
I haven't found a common cause for it happening when executing "vcs pull".

When I run the command using the --debug flag, a long list is shown in the "DEBUG:vcstool.executor:ongoing" line, containing the names of the repositories I'm trying to import. This list exhausts all the contained repositories, but gets stuck on the last remaining one.

Here is the output I obtain (with anonymized names of the repos, for privacy reasons) when importing 3 git repositories.

myuser@machine1:~/development/my_workspace/src$ vcs pull --debug
DEBUG:vcstool.executor:started './repo1'
DEBUG:vcstool.executor:started './repo2'
DEBUG:vcstool.executor:started './repo3'
DEBUG:vcstool.executor:ongoing ['./repo1', './repo2', './repo3']
DEBUG:vcstool.executor:finished './repo1'
.
DEBUG:vcstool.executor:ongoing ['./repo2', './repo3']
DEBUG:vcstool.executor:finished './repo3'
.
DEBUG:vcstool.executor:ongoing ['./repo2']

Thanks for your support.