#32053: Tor Browser bundles based on Firefox 68 ESR are not reproducible (LLVM optimization issue) -------------------------------------------------+------------------------- 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: -------------------------------------------------+-------------------------
Comment (by gk): Replying to [comment:27 alexcrichton]: > I just posted a comment on the bug report with a much more minimal test case (only a few hundred KB!), it only took many cpu hours to extract :) > > From here I'm still trying to reduce it further to increase the likelihood that someone from LLVM can help fix (I'm not so good at LLVM internals). This test case is small enough though that it may be pretty reasonable to bisect LLVM itself with. Dealing with a bitcode file across that many LLVM revisions may be pretty difficult though, so bisection likely won't be trivial. Okay, it seems the optimization being the problem here is in -O1, which is unfortunate because I had some hope reducing the current -O2 to it could be a workaround... I am not sure whether -O0 is worth it. But it might be an option if we don't solve the bug until the next planned release. I'll set up some bisecting in parallel to your efforts and see whether that gets us anywhere. If you get to the problem with `bugpoint` or some LLVM dev is helping meanwhile even better. :) -- Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32053#comment:28> Tor Bug Tracker & Wiki <https://trac.torproject.org/> The Tor Project: anonymity online
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