[tor-bugs] #29036 [Core Tor/Tor]: Coverage merge failures cause test_process_slow stderr check to fail

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#29036: Coverage merge failures cause test_process_slow stderr check to fail
-------------------------------------------------+-------------------------
 Reporter:  teor                                 |          Owner:  ahf
     Type:  defect                               |         Status:
                                                 |  assigned
 Priority:  High                                 |      Milestone:  Tor:
                                                 |  0.4.1.x-final
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  unspecified
 Severity:  Major                                |     Resolution:
 Keywords:  041-accepted-20190115, regression,   |  Actual Points:
  tor-ci                                         |
Parent ID:                                       |         Points:  0.5
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by ahf):

 I'm not sure if I read the output correctly, but does this error condition
 mean that the test binaries (and the child-process binary) output "Merge
 mismatch for function X" on standard error?

 We can detect that line in stderr's first line if we want to in the
 process tests, but I don't think that would be the right solution. Can we
 either fail in an earlier way when this condition appears OR figure out a
 way to reset the state so these "Merge mismatch" disappear?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29036#comment:5>
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