[erlang-questions] ct:pal crashing

[Attila Rajmund Nohl]

Recently our common_test suites started to fail in our (gitlab-runner)
CI environment with errors like this:

        {dir_SUITE,init_per_testcase,
            {{noproc,
                 {gen_event,call,
                     [cth_readable_logger,cth_readable_failonly,
                      {ct_pal,
                          [10,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,
                           45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,
                           45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,45,
                           45,45,10,"2018-06-06 19:41:49.002",10,116,101,115,
                           116,32,105,110,105,116,32,39,"bic",39,58,32,68,101,
                           108,101,116,101,100,32,107,101,121,115,32,"[]",10,
                           10]}]}},
             [{gen_event,call1,3,[{file,"gen_event.erl"},{line,207}]},
              {cthr,pal,4,
                  [{file,

"/usr/src/rebar3-src/_build/default/lib/cth_readable/src/cthr.erl"},
                   {line,74}]},

As far as I understand the gitlab CI environment and our setup, the CI
job fetches the erlang:19 Docker image:

Using docker image
sha256:2ea95f0c3147e50b79b4fcd28c955c80c2e57eb20fb8ff61bb8ed1873d0b6957
for erlang:19

and executes our test suite in that image. Our code did not change,
but it looks like the image did change, at least at the latest
successful test I see this in the logs:

Using docker image
sha256:e36b5300c4cf2f504f0222ea66bbf81fb2e514ad88cb93f111b5e85e7893b99a
for erlang:19

Do you know what could cause this problem?