1250863 - Differential Testing: Different output message involving .findScripts

Status: RESOLVED INVALID

(Core :: JavaScript Engine: JIT, defect)

Description

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

// jsfunfuzz-generated
setGCCallback({
    action: "majorGC",
});
// Adapted from randomly chosen test: js/src/jit-test/tests/debug/bug-826669.js
gczeal(9, 2);
var g1 = newGlobal();
var dbg = new Debugger();
var g1w = dbg.addDebuggee(g1);
g1.eval('function f() {}');
print(dbg.findScripts({}));


$ ./js-dbg-64-dm-clang-darwin-a9e33d8c48b5 --fuzzing-safe --no-threads --ion-eager testcase.js
[object Script],[object Script],[object Script]

$ ./js-dbg-64-dm-clang-darwin-a9e33d8c48b5 --fuzzing-safe --no-threads --no-baseline --no-ion testcase.js
[object Script],[object Script]

Tested this on m-c rev a9e33d8c48b5.

My configure flags are:

CC="clang -Qunused-arguments" CXX="clang++ -Qunused-arguments" AR=ar AUTOCONF=/usr/local/Cellar/autoconf213/2.13/bin/autoconf213 sh /Users/skywalker/trees/mozilla-central/js/src/configure --target=x86_64-apple-darwin14.5.0 --disable-jemalloc --enable-debug --enable-more-deterministic --with-ccache --enable-gczeal --enable-debug-symbols --disable-tests

python -u ~/funfuzz/js/compileShell.py -b "--enable-debug --enable-more-deterministic" -r a9e33d8c48b5


Due to skipped revisions, the first bad revision could be any of:
changeset:   https://hg.mozilla.org/mozilla-central/rev/3bcc3881b95d
user:        Shu-yu Guo
date:        Tue Oct 06 14:00:28 2015 -0700
summary:     Bug 589199 - Make a global lexical scope and hook it up to JS entry points. (r=efaust)

changeset:   https://hg.mozilla.org/mozilla-central/rev/b9f647fe2d10
user:        Shu-yu Guo
date:        Tue Oct 06 14:00:29 2015 -0700
summary:     Bug 589199 - Parse and emit bytecode for global lexicals. (r=efaust)

changeset:   https://hg.mozilla.org/mozilla-central/rev/b2d8f1cd3afc
user:        Shu-yu Guo
date:        Tue Oct 06 14:00:29 2015 -0700
summary:     Bug 589199 - Support global lexicals in the interpreter. (r=efaust)

changeset:   https://hg.mozilla.org/mozilla-central/rev/6e4a8943d496
user:        Shu-yu Guo
date:        Tue Oct 06 14:00:29 2015 -0700
summary:     Bug 589199 - Support global lexicals in Baseline. (r=jandem)

changeset:   https://hg.mozilla.org/mozilla-central/rev/26fc971a24c4
user:        Shu-yu Guo
date:        Tue Oct 06 14:00:29 2015 -0700
summary:     Bug 589199 - Support global lexicals in Ion. (r=jandem)

changeset:   https://hg.mozilla.org/mozilla-central/rev/3228ac384c92
user:        Shu-yu Guo
date:        Tue Oct 06 14:00:29 2015 -0700
summary:     Bug 589199 - Fix eval static scope to play with the global lexical scope. (r=efaust)

changeset:   https://hg.mozilla.org/mozilla-central/rev/04eb8f524122
user:        Shu-yu Guo
date:        Tue Oct 06 14:00:29 2015 -0700
summary:     Bug 589199 - Fix up the global lexical scope when merging off-thread compiled scripts. (r=bhackett)

changeset:   https://hg.mozilla.org/mozilla-central/rev/c609df6d3895
user:        Shu-yu Guo
date:        Tue Oct 06 14:00:29 2015 -0700
summary:     Bug 1202902 - Support non-syntactic extensible lexical scopes. (r=billm)

Shu-yu, is bug 589199 or bug 1202902 a likely regressor?

Comment 1

[Shu-yu Guo [:shu]]

This is not a bug but findScripts exposing GC behavior.

Sometimes the eval script from |g1.eval('function f() {}')| is GCed, sometimes it isn't. I'd blacklist findScripts from differential fuzzing.

Comment 2

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

Blacklisting of ".findScripts" done in:

https://github.com/MozillaSecurity/funfuzz/commit/669fb6cb83c870cb9ea7495bb146a683304cd5bb

Thanks!