[tor-bugs] #32053 [Applications/Tor Browser]: Tor Browser bundles based on Firefox 68 ESR are not reproducible (LLVM optimization issue)

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#32053: Tor Browser bundles based on Firefox 68 ESR are not reproducible (LLVM
optimization issue)
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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:  TorBrowserTeam201911, tbb-9.0-must,  |  Actual Points:
  tbb-9.0-issues, tbb-regression,                |
  tbb-9.0.1-can, GeorgKoppen201911               |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by gk):

 Replying to [comment:24 alexcrichton]:
 > I've opened up https://bugs.llvm.org/show_bug.cgi?id=43909 and will
 track that, I'm attempting to use LLVM's automatic test case reduction
 tools but it's likely going to take quite some time due to how large the
 module is.

 Thanks! Let me know whether/how I can help here. I don't know much about
 `opt` and its options/flags, so there is some learning curve for me but I
 could spend some cycles tomorrow and the coming days given how important
 that bug is for us. Maybe I should just start bisecting figuring out where
 this got introduced. Might help tracking the optimization issue down.
 Either way, let me know.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32053#comment:26>
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