1069044 - destroyInspector may hang during shutdown

Status: RESOLVED DUPLICATE of bug 1478246

(DevTools :: Framework, defect)

Description

[Mark Hammond [:markh] [:mhammond]]

If you execute the test command:

./mach mochitest-devtools --e10s browser/devtools/framework/test/browser_toolbox_select_event.js

(Note that you may also need the patch to bug 1069033)

The test passes, then pauses at the end before reporting:

"""
console.error:
  Protocol error (noSuchActor): No such actor for ID: conn0.child2/pagestyle26
throwing with 0
console.error:
  Message: Error: Unexpected packet conn0.child2/customhighlighter25, {"from":"conn0.child2/customhighlighter25","error":"noSuchActor","message":"No such actor for ID: conn0.child2/customhighlighter25"}
  Stack:
    Front<.onPacket@resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/devtools/server/protocol.js:1104:17
...
WARNING: At least one completion condition is taking too long to complete. Conditions: [{"name":"DevTools: Wait until toolbox is destroyed","state":"(none)","filename":"resource://gre/modules/commonjs/toolkit/loader.js ->...
ShutdownLeaks: Wait for cleanup to be finished before checking for leaks
"""

Before timing out.  The problem seems to be that the toolbox destroyInspector() method is hanging as the promise returned by this._walker.release() never resolves.