998262 - Differential Testing: Different output message involving buildPar

Status: RESOLVED FIXED

(Core :: JavaScript Engine: JIT, defect)

Description

[Gary Kwong [:gkw] [:nth10sd] (NOT official MoCo now)]

print(
    Array.buildPar(3, function() {
        return [] !== 0.1
    })
)

$ ./js-opt-64-dm-ts-darwin-7fe3ee0cf8be --fuzzing-safe --ion-parallel-compile=off testcase.js
true,true,false

$ ./js-opt-64-dm-ts-darwin-7fe3ee0cf8be --fuzzing-safe --ion-parallel-compile=off --no-baseline testcase.js
true,true,true

(Tested this on 64-bit Mac js opt threadsafe deterministic shell off m-c rev 7fe3ee0cf8be, and I think it also reproduces on Linux)

My configure flags (Mac) 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-optimize --disable-debug --enable-profiling --enable-gczeal --enable-debug-symbols --disable-tests --enable-more-deterministic --with-ccache --enable-threadsafe <other NSPR options>

This blocks differential testing fuzzing with buildPar.

Comment 1

[Gary Kwong [:gkw] [:nth10sd] (NOT official MoCo now)]

autoBisect shows this is probably related to the following changeset:

The first bad revision is:
changeset:   http://hg.mozilla.org/mozilla-central/rev/ad7777f1c0f5
user:        Shu-yu Guo
date:        Fri Feb 07 14:40:29 2014 -0800
summary:     Bug 958370 - Unify chunks and slices; self-host the scheduler's slice processing loop. (r=nmatsakis)

Shu-yu, is bug 958370 a likely regressor?

Comment 2

[Shu-yu Guo [:shu]]

Attachment: Fix StrictlyEqualImplPar for when operands have differing types.

Comment 3

[Gary Kwong [:gkw] [:nth10sd] (NOT official MoCo now)]

Thanks for fixing this! Is this ready for landing?

Comment 4

[Shu-yu Guo [:shu]]

(In reply to Gary Kwong [:gkw] [:nth10sd] from comment #3)
> Thanks for fixing this! Is this ready for landing?

Why yes: https://hg.mozilla.org/integration/mozilla-inbound/rev/9fc8626c0cb7

Comment 5

[Carsten Book [:Tomcat]]

https://hg.mozilla.org/mozilla-central/rev/9fc8626c0cb7