1073702 - Assertion failure: data.s.payload.why == why, at dist/include/js/Value.h

Status: RESOLVED FIXED

(Core :: JavaScript Engine: JIT, defect)

Description

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

try {
    let x = ((function f(y) {
        if (y > 0) {
            f(-1)
        }
        x
    })(1))
} catch (e) {}

asserts js debug shell on m-c changeset 16ff803b47a9 with --ion-eager --no-threads at Assertion failure: data.s.payload.why == why, at dist/include/js/Value.h.

Debug configure flags:

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

=== Tinderbox Build Bisection Results by autoBisect ===

The "good" changeset has the timestamp "20140915155135" and the hash "170ce237e4a0".
The "bad" changeset has the timestamp "20140915164436" and the hash "b7f4709b34c3".

Likely regression window: https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=170ce237e4a0&tochange=b7f4709b34c3

Shu-yu, is bug 1001090 a possible regressor? (Assuming related to the let changes)

Comment 1

[Shu-yu Guo [:shu]]

Attachment: Check for uninitialized lexical bindings in FetchName and friends.

Comment 2

[Jan de Mooij [:jandem]]

Comment on attachment 8496371 [details] [diff] [review]
Check for uninitialized lexical bindings in FetchName and friends.

Review of attachment 8496371 [details] [diff] [review]:
-----------------------------------------------------------------

Can you add the testcase?

Comment 3

[Shu-yu Guo [:shu]]

https://hg.mozilla.org/integration/mozilla-inbound/rev/992946f2286a

Comment 4

[Christian Holler (:decoder)]

JSBugMon: The testcase found in this bug no longer reproduces (tried revision 835ef55e175e).

Comment 5

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

http://hg.mozilla.org/mozilla-central/rev/992946f2286a