1133354 - Assertion failure: (LookupAliasedNameSlot(bceOfDef, bceOfDef->script, pn->name(), &sc)), at frontend/BytecodeEmitter.cpp

Status: RESOLVED DUPLICATE of bug 1140196

(Core :: JavaScript Engine, defect)

Description

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

for (var {
    N, x: {
        c: {
            x: w = ((function(x) {
                return {
                    n() {
                        (function() {
                            for (z in x) {}
                        })()
                    }
                }
            }))
        }
    }
} in w) {}

asserts js debug shell on m-c changeset 81f979b17fbd with --fuzzing-safe --no-threads --ion-eager at Assertion failure: (LookupAliasedNameSlot(bceOfDef, bceOfDef->script, pn->name(), &sc)), at frontend/BytecodeEmitter.cpp.

Debug configure options:

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-darwin12.5.0 --enable-debug --enable-optimize --enable-nspr-build --enable-more-deterministic --with-ccache --enable-gczeal --enable-debug-symbols --disable-tests

python -u ~/fuzzing/js/compileShell.py -b "--enable-debug --enable-optimize --enable-more-deterministic --enable-nspr-build -R ~/trees/mozilla-central" -r 81f979b17fbd

=== Treeherder Build Bisection Results by autoBisect ===

The "good" changeset has the timestamp "20150121013236" and the hash "26d8f946a53b".
The "bad" changeset has the timestamp "20150121021935" and the hash "8832848bf234".

Likely regression window: https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=26d8f946a53b&tochange=8832848bf234

Jason, is bug 932080 a likely regressor?

Comment 1

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

Attachment: stack

(lldb) bt 5
* thread #1: tid = 0x303c3, 0x0000000100180b41 js-dbg-64-dm-nsprBuild-darwin-81f979b17fbd`EmitVarOp(js::ExclusiveContext*, js::frontend::ParseNode*, JSOp, js::frontend::BytecodeEmitter*) [inlined] EmitAliasedVarOp(cx=<unavailable>, pn=<unavailable>) + 657 at BytecodeEmitter.cpp:1365, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
  * frame #0: 0x0000000100180b41 js-dbg-64-dm-nsprBuild-darwin-81f979b17fbd`EmitVarOp(js::ExclusiveContext*, js::frontend::ParseNode*, JSOp, js::frontend::BytecodeEmitter*) [inlined] EmitAliasedVarOp(cx=<unavailable>, pn=<unavailable>) + 657 at BytecodeEmitter.cpp:1365
    frame #1: 0x00000001001808b0 js-dbg-64-dm-nsprBuild-darwin-81f979b17fbd`EmitVarOp(cx=<unavailable>, pn=<unavailable>, op=JSOP_INITALIASEDLEXICAL, bce=<unavailable>) + 2704 at BytecodeEmitter.cpp:1421
    frame #2: 0x000000010018a67e js-dbg-64-dm-nsprBuild-darwin-81f979b17fbd`EmitNameOp(cx=0x0000000101d16e20, bce=0x00007fff5fbfa8a8, pn=0x0000000102050d30, callContext=false) + 174 at BytecodeEmitter.cpp:2341
    frame #3: 0x00000001001707d1 js-dbg-64-dm-nsprBuild-darwin-81f979b17fbd`js::frontend::EmitTree(cx=<unavailable>, bce=<unavailable>, pn=<unavailable>) + 5217 at BytecodeEmitter.cpp:7260
    frame #4: 0x0000000100173994 js-dbg-64-dm-nsprBuild-darwin-81f979b17fbd`js::frontend::EmitTree(js::ExclusiveContext*, js::frontend::BytecodeEmitter*, js::frontend::ParseNode*) [inlined] EmitForIn(cx=<unavailable>, bce=<unavailable>, pn=0x0000000102050c88, top=<unavailable>) + 74 at BytecodeEmitter.cpp:5099
(lldb)