[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, 029-backport, 034-backport,            |
  035-backport, 040-backport                     |
Parent ID:                                       |         Points:  0.5
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by teor):

 * keywords:  041-accepted-20190115, regression, tor-ci =>
     041-accepted-20190115, regression, tor-ci, 029-backport, 034-backport,
     035-backport, 040-backport


Comment:

 Replying to [comment:7 ahf]:
 > I think it would make the most sense to delete the coverage files so
 they don't take up space in the cache rather than deleting them from the
 cache before we (maybe?) update them. It seems like these files should
 never be cached, right?

 It doesn't make sense to cache the files, and it's probably a bad thing:
 coverage can change when unrelated modules change.

 If we delete the files before caching, they'll disappear from the cache
 after the first build on each branch. So the initial build, and old
 branches, might still have this bug. I think that's ok?

 Let's create a "clean-coverage" make target, and add it in the
 "before_cache:" phase?
 https://docs.travis-ci.com/user/caching/#before_cache-phase

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29036#comment:8>
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