1193213 - Assertion failure: this->is<T>(), at jsobj.h

Status: RESOLVED FIXED

(Core :: JavaScript Engine, defect)

Description

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

x = [''];
x = [''];
x = [''];
x = [''];
x = [''];
x = [''];
x = [''];
x = [''];
x = [''];
x = [''];
x = [''];
x = [''];
x = [''];
x = [''];
x = [''];
x = [''];
x = [''];
x = [''];
x = [''];
p``;

asserts js debug shell on m-c changeset 8cba870a352c with --fuzzing-safe --no-threads --ion-eager --unboxed-arrays at Assertion failure: this->is<T>(), at jsobj.h

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-nspr-build --enable-more-deterministic --with-ccache --enable-gczeal --enable-debug-symbols --disable-tests

python -u ~/funfuzz/js/compileShell.py -b "--enable-debug --enable-more-deterministic --enable-nspr-build" -r 8cba870a352c

autoBisect is running, but guessing that this is related to --unboxed-arrays so setting needinfo? from Brian.

Comment 1

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

Attachment: stack

(lldb) bt 5
* thread #1: tid = 0xc2257, 0x00000001001bfde7 js-dbg-64-dm-nsprBuild-darwin-8cba870a352c`js::frontend::BytecodeEmitter::emitCallSiteObject(js::frontend::ParseNode*) + 52 at jsobj.h:547, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
  * frame #0: 0x00000001001bfde7 js-dbg-64-dm-nsprBuild-darwin-8cba870a352c`js::frontend::BytecodeEmitter::emitCallSiteObject(js::frontend::ParseNode*) + 52 at jsobj.h:547
    frame #1: 0x00000001001bfdb3 js-dbg-64-dm-nsprBuild-darwin-8cba870a352c`js::frontend::BytecodeEmitter::emitCallSiteObject(this=<unavailable>, pn=<unavailable>) + 467 at BytecodeEmitter.cpp:4731
    frame #2: 0x00000001001aab81 js-dbg-64-dm-nsprBuild-darwin-8cba870a352c`js::frontend::BytecodeEmitter::emitTree(this=0x00007fff5fbfec78, pn=0x00000001028ae6d8) + 1633 at BytecodeEmitter.cpp:7900
    frame #3: 0x00000001001c7484 js-dbg-64-dm-nsprBuild-darwin-8cba870a352c`js::frontend::BytecodeEmitter::emitCallOrNew(this=0x00007fff5fbfec78, pn=0x00000001028ae688) + 1236 at BytecodeEmitter.cpp:6737
    frame #4: 0x00000001001aa7c5 js-dbg-64-dm-nsprBuild-darwin-8cba870a352c`js::frontend::BytecodeEmitter::emitTree(this=0x00007fff5fbfec78, pn=0x00000001028ae688) + 677 at BytecodeEmitter.cpp:7859
(lldb)

Comment 2

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

Also happens with "--fuzzing-safe --no-threads --no-ion --unboxed-arrays".

Comment 3

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

autoBisect shows this is probably related to the following changeset:

The first bad revision is:
changeset:   https://hg.mozilla.org/mozilla-central/rev/3a994e364343
user:        Brian Hackett
date:        Sat Jun 13 07:54:06 2015 -0700
summary:     Bug 1172943 - Use unboxed arrays for JSON and script literal arrays, r=jandem.

Brian, is bug 1172943 a likely regressor?

Comment 4

[Christian Holler (:decoder)]

JSBugMon: Cannot process bug: Unable to automatically reproduce, please track manually.

Comment 5

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

$ ~/shell-cache/js-dbg-64-dm-nsprBuild-darwin-29b2df16e961/js-dbg-64-dm-nsprBuild-darwin-29b2df16e961 --fuzzing-safe --no-threads --ion-eager --unboxed-arrays 1193213.js
Assertion failure: this->is<T>(), at /Users/skywalker/trees/mozilla-central/js/src/jsobj.h:547
Segmentation fault: 11

Just reproduced on m-c rev 29b2df16e961.

Note that there are backticks in the testcase in comment 0.

Comment 6

[Brian Hackett [Laid off!]]

Attachment: patch

These NativeObject casts are unnecessary.

Comment 7

[Jason Orendorff [:jorendorff]]

Comment on attachment 8651093 [details] [diff] [review]
patch

Review of attachment 8651093 [details] [diff] [review]:
-----------------------------------------------------------------

r=me.

Comment 8

[Pulsebot]

https://hg.mozilla.org/integration/mozilla-inbound/rev/8e716c7b5571

Comment 9

[Ryan VanderMeulen [:RyanVM]]

https://hg.mozilla.org/mozilla-central/rev/8e716c7b5571