#32053: Tor Browser bundles based on Firefox 68 ESR are not reproducible (LLVM optimization issue) -------------------------------------------------+------------------------- Reporter: gk | Owner: gk Type: defect | Status: | assigned 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 | Parent ID: | Points: Reviewer: | Sponsor: -------------------------------------------------+-------------------------
Comment (by gk): Replying to [comment:43 gk]: > Okay, some status update. Bisecting gets hard. I am down to building stylo with Rust 1.30.0 and am at LLVM's b1546da0e8849d58fcdcf17fa1f2fab0cdae70a4 and have not reached the bottom yet. Building with Rust 1.29.2 I am down to LLVM's 8c59921ca3284ced1c358c4c86ec2c830db0bd70 and still have not reached the bottom... > While exploring ways to move further here I'll investigate whether we can just move the `jump-threading` optimization out of `-O1`, say, into `-O3` so the we are actually do not use that one. I tried that, surprisingly enough that does not fix the issue. I inspected the log of the optimization passes that got run and no jump-threading showed up (so, that part worked). However, I still got non-reproducible outcomes. I gonna ask on the LLVM bug whether that's expected and if not whether that could give us some lead where to look closer to understand the bug better. -- Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32053#comment:47> Tor Bug Tracker & Wiki <https://trac.torproject.org/> The Tor Project: anonymity online
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