This bug was filed from the Socorro interface and is report bp-30b62941-2445-41aa-bc5f-8caae0181116. ============================================================= Top 10 frames of crashing thread: 0 libxul.so table_isExternal js/src/wasm/WasmCraneliftCompile.cpp:437 1 libxul.so baldrdash::wasm2clif::TransEnv::get_table js/src/wasm/cranelift/src/baldrdash.rs:140 2 libxul.so <baldrdash::wasm2clif::TransEnv<'a, 'b, 'c> as cranelift_wasm::environ::spec::FuncEnvironment>::make_table js/src/wasm/cranelift/src/wasm2clif.rs:486 3 libxul.so cranelift_wasm::code_translator::translate_operator third_party/rust/cranelift-wasm/src/state.rs:324 4 libxul.so cranelift_compile_function third_party/rust/cranelift-wasm/src/func_translator.rs:195 5 libxul.so js::wasm::CraneliftCompileFunctions js/src/wasm/WasmCraneliftCompile.cpp:307 6 libxul.so ExecuteCompileTask js/src/wasm/WasmGenerator.cpp:674 7 libxul.so js::wasm::ExecuteCompileTaskFromHelperThread js/src/wasm/WasmGenerator.cpp:709 8 libxul.so js::HelperThread::handleWasmWorkload js/src/vm/HelperThreads.cpp:2063 9 libxul.so js::HelperThread::ThreadMain js/src/vm/HelperThreads.cpp:2597 ============================================================= There is 1 crash in nightly 65 with buildid 20181115100051. In analyzing the backtrace, the regression may have been introduced by patch [1] to fix bug 1500167. [1] https://hg.mozilla.org/mozilla-central/rev?node=ea1da7c247ea

I expect this to be transient until bug 1507418 landed in central, so this should not reproduce on more recent Nightly builds. The first build that has the patch according to https://hg.mozilla.org/mozilla-central/rev/72b025a3da81 is 20181115223444, which is more recent that 20181115100051, so that would confirm this hypothesis. Closing as a duplicate.

Fixed in bug 1507418.