1265661 - JavaScript error: , line 0: TypeError: can't access dead object

Status: RESOLVED WORKSFORME

(Core :: JavaScript Engine, defect)

Description

[Jonathan Watt [:jwatt]]

During shutdown of debug builds I get a lot of these lines:

  JavaScript error: , line 0: TypeError: can't access dead object

Comment 1

[Jonathan Watt [:jwatt]]

Luke, any idea who might be able to debug this?

Comment 2

[Luke Wagner [:luke]]

That error appears to be reported by the DeadObjectProxy which gets created when we sever chrome's connection to a content window when it's time for that content window to die.

khuey added this way back; he might have better tips for debugging these, but, if nothing else, I'd put a breakpoint on ReportDead (in a DEBUG build):
  http://mxr.mozilla.org/mozilla-central/source/js/src/proxy/DeadObjectProxy.cpp#18
and, when that hits during shutdown, call js::DumpBacktrace(cx) (from the debugger)
  http://mxr.mozilla.org/mozilla-central/source/js/src/jsobj.cpp#3617
to print out the JS callstack.

Comment 3

[Kyle Huey (Exited; not receiving bugmail, old account, do not use)]

What Luke said, pretty much.

Comment 4

[Boris Zbarsky [:bzbarsky]]

Jonathan, can you still reproduce this?

Comment 5

[Jonathan Watt [:jwatt]]

No.