https://blog.ast.moe/en/tags/jit/Recent posts: GorimuchuHugohttps://blog.ast.moe/en/blog/2026-09-13/Sun, 13 Sep 2026 20:20:51 +0900https://blog.ast.moe/en/blog/2026-09-13/<p>While working on implementing CSS in my own browser, Omoikane (<a href="https://github.com/ieee0824/omoikane">source</a>), Acid3 began crashing due to memory errors.</p> <p>The problem only occurs when the baseline JIT is enabled; it runs fine with the interpreter.</p> <p>Furthermore, Omoikane’s Acid3 runner has two execution modes, Faithful and DirectDrive. Faithful completes all 100 points, but then it crashes during DirectDrive.</p> <p>The failure manifests differently depending on the environment.</p> <table> <thead> <tr> <th>Environment</th> <th>Observed failure</th> </tr> </thead> <tbody> <tr> <td>x86_64 Linux</td> <td>SIGSEGV</td> </tr> <tr> <td>ARM64 Linux</td> <td>SIGABRT, ~60 GB allocation, SIGSEGV on rerun</td> </tr> <tr> <td>ARM64 macOS</td> <td>SIGSEGV, SIGBUS on rerun</td> </tr> </tbody> </table> <p>Even though it’s the same test, the signals differ.</p>