x = Array.buildPar(7, Symbol); Array.prototype.push.call(x, 2); x.mapPar(function(){}, 1) asserts js debug shell on m-c changeset 84bd8d9f4256 with --ion-eager --ion-offthread-compile=off at Assertion failure: false (MOZ_ASSERT_UNREACHABLE: Invalid BailoutKind), at vm/ForkJoin.cpp My configure flags are: CC="clang -Qunused-arguments" CXX="clang++ -Qunused-arguments" AR=ar sh /Users/skywalker/trees/mozilla-central/js/src/configure --target=x86_64-apple-darwin12.5.0 --enable-debug --enable-optimize --enable-profiling --enable-gczeal --enable-debug-symbols --disable-tests --enable-more-deterministic --with-ccache --enable-threadsafe <other NSPR options> === Tinderbox Build Bisection Results by autoBisect === The "good" changeset has the timestamp "20140626231828" and the hash "8f83a0ab5060". The "bad" changeset has the timestamp "20140627003628" and the hash "72a548ec4f56". Likely regression window: https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=8f83a0ab5060&tochange=72a548ec4f56 Shu-yu, is bug 1028331 a likely regressor, or did it just expose it?

Caused by bug 645416 part 6, which added a new BailoutKind along with the JIT machinery for Symbols.

JSBugMon: The testcase found in this bug no longer reproduces (tried revision b0701d069bf9).

Comment on attachment 8454755 [details] [diff] [review] Handle Bailout_NonSymbolInput in PJS bailout warnings. Review of attachment 8454755 [details] [diff] [review]: ----------------------------------------------------------------- ::: js/src/vm/ForkJoin.cpp @@ +1114,5 @@ > case Bailout_NonStringInput: > case Bailout_NonStringInputInvalidate: > return "can't unbox: expected string"; > + case Bailout_NonSymbolInput: > + return "can't unbox: expected symbol"; Darn it. Sorry. :(