Clone and pull hangs on stderr

[noisythoughts]

GitPython 3.1.27 hangs on pull and clone (e.g. Repo.clone_from(URL, repo_path) or with git_repo.git.pull('origin', 'master')).

The strace for the output for pull is as follows:

clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f449bc55a10) = 1501
close(10)                               = 0
close(4)                                = 0
close(8)                                = 0
close(6)                                = 0
read(9, "", 50000)                      = 0
close(9)                                = 0
poll([{fd=5, events=POLLIN}, {fd=7, events=POLLIN}], 2, -1) = 1 ([{fd=7, revents=POLLIN}])
read(7, "From ssh://stash.git.company.com"..., 32768) = 110
poll([{fd=5, events=POLLIN}, {fd=7, events=POLLIN}], 2, -1) = 1 ([{fd=5, revents=POLLIN}])
read(5, "Already up to date.\n", 32768) = 20
poll([{fd=5, events=POLLIN}, {fd=7, events=POLLIN}], 2, -1) = 1 ([{fd=5, revents=POLLHUP}])
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=1501, si_uid=1000, si_status=0, si_utime=9, si_stime=24} ---
read(5, "", 32768)                      = 0
close(5)                                = 0
poll([{fd=7, events=POLLIN}], 1, -1^C)    = 1 ([{fd=7, revents=POLLHUP}])

Everything works as expected on GitPython 3.1.18

[Byron]

Since it hangs with git_repo.git.pull(…) as well, that would mean it hangs despite just calling communicate() which is expected to work 'properly', as it won't hang forever because it consumes stdout and stderr at the same time. If it hangs nonetheless, maybe ssh hangs or something changed in the python standard library.

I am closing this as there is not enough to go on for a fix, but assuming my assumption is wrong it might be worth to bisect between 3.1.18 and 3.1.27 to find the commit that breaks it. With that knowledge, please reopen this issue or open a new one, or even better, submit a PR with a fix.
Thank you and thanks for your understanding.