783441 - "Assertion failure: bi->aliased(),"

Status: RESOLVED FIXED

(Core :: JavaScript Engine, defect)

Description

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

Attachment: stack

(function(x, x) {
  eval(x = function() {})
})()

asserts js debug shell on m-c changeset a79132ac2f05 without any CLI arguments at Assertion failure: bi->aliased(),

I think bug 775323 may be the cause here.

Comment 1

[Christian Holler (:decoder)]

Also hitting this, with varying signatures => fuzzblocker.

Comment 2

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

Actually, bug 767013 may be the cause.

autoBisect shows this is probably related to the following changeset:

The first bad revision is:
changeset:   102515:abc8c217f032
user:        Luke Wagner
date:        Mon Aug 06 07:56:45 2012 -0700
summary:     Bug 767013 - only store aliased variables in scope objects (r=bhackett)

Comment 3

[Luke Wagner [:luke]]

Attachment: fix and test

Thanks!
/me shakes fist at duplicate formal args...
simple fix though

Comment 4

[Luke Wagner [:luke]]

https://hg.mozilla.org/integration/mozilla-inbound/rev/e3be0d046085

Comment 5

[Ryan VanderMeulen [:RyanVM]]

https://hg.mozilla.org/mozilla-central/rev/e3be0d046085

Comment 6

[Christian Holler (:decoder)]

A testcase for this bug was automatically identified at js/src/jit-test/tests/basic/testBug783441.js.