OTP27: case_clause when generating CT results

[mkuratczyk]

Describe the bug
I just had a crash when running tests with OTP27.

CRASHED while updating /Users/mkuratczyk/rabbitmq/server/otp27/deps/rabbit/logs/index.html!
{{case_clause,{176,0,0,0,510171915}},
 [{ct_logs,make_one_index_entry,6,[{file,"ct_logs.erl"},{line,1398}]},
  {ct_logs,make_all_suites_index3,9,[{file,"ct_logs.erl"},{line,2829}]},
  {ct_logs,make_all_suites_index2,3,[{file,"ct_logs.erl"},{line,2763}]},
  {ct_logs,make_all_suites_index1,4,[{file,"ct_logs.erl"},{line,2735}]},
  {ct_logs,make_all_suites_index_from_cache,5,
           [{file,"ct_logs.erl"},{line,2543}]},
  {ct_logs,make_all_suites_index,2,[{file,"ct_logs.erl"},{line,2461}]},
  {ct_logs,logger,4,[{file,"ct_logs.erl"},{line,757}]}]}
Test run crashed! This could be an internal error - please report!

{could_not_start_process,ct_logs,
    {badarg,
        [{erlang,'++',
             [{error,
                  {{case_clause,{176,0,0,0,510171915}},
                   [{ct_logs,make_one_index_entry,6,
                        [{file,"ct_logs.erl"},{line,1398}]},
                    {ct_logs,make_all_suites_index3,9,
                        [{file,"ct_logs.erl"},{line,2829}]},
                    {ct_logs,make_all_suites_index2,3,
                        [{file,"ct_logs.erl"},{line,2763}]},
                    {ct_logs,make_all_suites_index1,4,
                        [{file,"ct_logs.erl"},{line,2735}]},
                    {ct_logs,make_all_suites_index_from_cache,5,
                        [{file,"ct_logs.erl"},{line,2543}]},
                    {ct_logs,make_all_suites_index,2,
                        [{file,"ct_logs.erl"},{line,2461}]},
                    {ct_logs,logger,4,[{file,"ct_logs.erl"},{line,757}]}]}},
              []],
             [{error_info,#{module => erl_erts_errors}}]},
         {ct_logs,update_tests_in_cache,2,[{file,"ct_logs.erl"},{line,2716}]},
         {ct_logs,make_all_suites_index_from_cache,5,
             [{file,"ct_logs.erl"},{line,2554}]},
         {ct_logs,make_all_suites_index,2,[{file,"ct_logs.erl"},{line,2461}]},
         {ct_logs,logger,4,[{file,"ct_logs.erl"},{line,757}]}]}}

To Reproduce
Unknown. It happened after I added a ct:pal() call to a test but it seems to crash updating the index.html so I'm not sure if that's even related. It also fails now after removing the ct:pal().

Affected versions
27.0

[u3s]

@Mikaka27 wondering could this some case missed in #8112?

[Mikaka27]

I will take a look

[Mikaka27]

@mkuratczyk I think you're running this with otp-26 instead of otp-27.
This could happen if for example you executed tests with otp-27, they generated their logs, and then you switched to otp-26 and tried to run the tests again while still having the ct_logs directory from otp-27 run.

Unfortunately we're not forwards compatible (so otp-26 will not know how to handle ct_logs from otp-27).
Could you check if it's the case?

[mkuratczyk]

I'm fairly sure that wasn't the case but I can't really check at this point. Feel free to close it, I will reopen/open a new one if I run into this again.

Thanks for looking into this and sorry if that was my mistake.

[Mikaka27]

Ok, I will close it for now, feel free to reach out again if needed.
I think it must be the case because the line numbers in stacktraces match otp-26 source code not otp-27 :(