[tor-bugs] #32053 [Applications/Tor Browser]: macOS bundles for Tor Browser 9.0a8 are not reproducible

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#32053: macOS bundles for Tor Browser 9.0a8 are not reproducible
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 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:  new
 Priority:  Immediate                            |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Critical                             |     Resolution:
 Keywords:  TorBrowserTeam201910, tbb-9.0-must,  |  Actual Points:
  tbb-9.0-issues, tbb-regression, tbb-9.0.1-can  |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by gk):

 I spent some time on this issue and here is what I have so far:

 If I exclude `servo` from `gkrust_features` I don't see the bug after
 rebuilding `libgkrust.a` 50 times twice on two different machines.

 However, just building `servo` (and the necessary `bindgen`) is hitting
 the problem and early-ish.

 FTR: I've modified `gkrust_features` like so:
 {{{
 -RustLibrary('gkrust', gkrust_features)
 +RustLibrary('gkrust', ['bindgen', 'quantum_render', 'cubeb-remoting',
 'moz_memory', 'moz_places', 'gecko_profiler'])
 }}}
 {{{
 -RUST_TEST_FEATURES = gkrust_features
 +RUST_TEST_FEATURES = ['bindgen', 'quantum_render', 'cubeb-remoting',
 'moz_memory', 'moz_places', 'gecko_profiler']
 }}}

 While that's no resurrection of #26475 my gut tells me LTO might still be
 involved somehow. So, I am testing next disabling LTO and checking whether
 that changes things.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32053#comment:6>
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