182604 2018-02-08 07:04:19 -0800 [GTK] imported/w3c/web-platform-tests/WebCryptoAPI/derive_bits_keys/pbkdf2.worker.html is flaky 2018-02-13 20:16:39 -0800 1 1 1 Unclassified WebKit WebKitGTK WebKit Nightly Build Unspecified Unspecified NEW P2 Normal --- 1 magomez webkit-unassigned bugs-noreply clopez mcatanzaro oldest_to_newest 1397523 0 magomez 2018-02-08 07:04:19 -0800 Varies between pass and crash. 1397536 1 mcatanzaro 2018-02-08 08:34:53 -0800 Please do post the backtrace for the crash from the bots. Crash reports are not very useful without a backtrace. 1398921 2 mcatanzaro 2018-02-13 20:16:39 -0800 It started failing when you added the crash expectation, because that overrode the toplevel expectations. You didn't do anything wrong there IMO, it was just bad luck; I think it's a waste of time to check the toplevel expectations for every change. I've changed our expectation to [ Pass Failure Slow Crash ]. (In reply to Michael Catanzaro from comment #1) > Please do post the backtrace for the crash from the bots. Crash reports are > not very useful without a backtrace. There is never any backtrace: https://build.webkit.org/results/GTK%20Linux%2064-bit%20Release%20(Tests)/r228270%20(5404)/imported/w3c/web-platform-tests/WebCryptoAPI/derive_bits_keys/pbkdf2.worker-crash-log.txt https://build.webkit.org/results/GTK%20Linux%2064-bit%20Release%20(Tests)/r228257%20(5397)/imported/w3c/web-platform-tests/WebCryptoAPI/derive_bits_keys/pbkdf2.worker-crash-log.txt https://build.webkit.org/results/GTK%20Linux%2064-bit%20Release%20(Tests)/r228237%20(5390)/imported/w3c/web-platform-tests/WebCryptoAPI/derive_bits_keys/pbkdf2.worker-crash-log.txt It's not the only test this happens to. Something is wrong with the bots. (Perhaps it is missing network process crashes, or UI process crashes?)