678090 - Assertion failure: spoff == js_ReconstructStackDepth(cx_, fp_->script(), pc_), at vm/Stack.cpp:1012

Status: RESOLVED FIXED

(Core :: JavaScript Engine, defect)

Description

[Christian Holler (:decoder)]

The following code asserts on mozilla-inbound (revision 609f37c36bd7, options -j -m -a):


function toSource(arr) {
  for (i=0; i<len; i++) {}
}
test();
function test() {
  function gen() {
    var c = test;
    try {
      yield c;
    } finally {
      this.toSource();
    }
  }
  var iter = gen();
  for (i in iter) {
    500();
  }
}

Comment 1

[Luke Wagner [:luke]]

Attachment: fix and test

Looks like there is a bug where the mjit's exception handling doesn't update the current pc to match the updated sp when closing open iterators (which is observable since this can run finalizers).  I suspect this is debug-only failure; I can't think of how it would manifest a real problem.

Comment 2

[Luke Wagner [:luke]]

http://hg.mozilla.org/integration/mozilla-inbound/rev/5bbc3615e387

Comment 3

[Marco Bonardo [:mak]]

http://hg.mozilla.org/mozilla-central/rev/5bbc3615e387

the bug number in the changeset is wrong

Comment 4

[Christian Holler (:decoder)]

Automatically extracted testcase for this bug was committed:

https://hg.mozilla.org/mozilla-central/rev/efaf8960a929