Build cancellation doesn't cancel all jobs

[TheJJ]

I think I observed that a forcepush, which aborts a build, kills the running job, but not others associated with the build.

I conclude this problem from the following error message of an aborted build:

debian
Job cancelled (it could sucessfully clone and partially run the job)

arch
Chantal failed; stdout: Traceback (most recent call last):,   File "/home/openage/chantal/__main__.py", line 32, in main,     build_job(args),   File "/home/openage/chantal/build.py", line 40, in build_job,     run_command("git checkout -q " + args.commit_sha, base_env),   File "/home/openage/chantal/util.py", line 46, in run_command,     raise RuntimeError("command failed: %s [%d]" % (cmd, retval)), RuntimeError: command failed: git checkout -q 54024bf525232a4426ffb46c5d48a0304624fc41 [128],

 git checkout -q 54024bf525232a4426ffb46c5d48a0304624fc41
fatal: reference is not a tree: 54024bf525232a4426ffb46c5d48a0304624fc41
command returned 128
internal error

-> It tried cloning a non-existing git reference which was force-pushed away.