602686 - If I leave Fennec's "Confirm Close" dialog unattended, an "Unresponsive Script" dialog corrupts it & keeps Fennec from ever quitting

Status: VERIFIED FIXED

(Firefox for Android Graveyard :: General, defect)

Description

[Daniel Holbert [:dholbert]]

This is on an n900 (maemo), btw.  I'm running today's Fennec 4.0b2pre nightly from the repository:
http://ftp.mozilla.org/pub/mozilla.org/mobile/repos/trunk_en-US/trunk_en-US_nightly.install

STEPS TO REPRODUCE:
 1. Open 2 tabs in Fennec.  (They can both be about:blank)
 2. Click the "x" in upper-right to quit.
  --> The "Confirm Close" / "You are about to close 2 tabs" dialog pops up.
 3. Set the phone down and wait for 5 or 10 minutes.
 4. Unlock the phone (slide open keyboard or use slider on side to toggle screen)

EXPECTED RESULTS:
 "Confirm Close" dialog should still be there, the way I left it.

ACTUAL RESULTS:
  A "Warning: Unresponsive Script" dialog has snuck in and "merged" with my Confirm Close script.  I have two foreground buttons visible: "OK | Cancel", not attached to any dialog, and in the background (grayed out) there's another dialog, saying:
>  Warning: Unresponsive script
>  You are about to close 2 tabs. Continue?A script on this page may be busy, or
>  it may have stopped responding. You can stop the script right now, or you can
>  [--can't read because it's covered up by the floating "OK|Cancel" buttons --]
>  [ Continue ] [ Stop Script ]

See attached screenshot.

PROCEEDING FROM THIS POINT:
 - "OK" and "Cancel" are the only things that are clickable
 - When I click either of them, it takes me back to Fennec, and I can browse normally, except **I can no longer quit Fennec**.  The "X" button in the upper-right won't do anything.  Even if I close all extra tabs (so there's only one remaining), the "X" button still doesn't work.

Comment 1

[Daniel Holbert [:dholbert]]

Attachment: screenshot when I pick my phone back up after it's been sitting at "Confirm Close" for 5-10 minutes

Comment 2

[Daniel Holbert [:dholbert]]

Just confirmed with a fresh Fennec profile, btw.  I only had to wait about 2 minutes -- 5-10 minutes should be a high upper bound for reproducing this.

Aakash, can you reproduce this?

Comment 3

[Mark Finkle (:mfinkle) (use needinfo?)]

Fennec modal dialog spin an event loop that must not be friendly to the JS script dialog.

In any case, we just landed bug 602670, which disables the slow script dialog. We shouldn't see it anymore for chrome scripts.

Comment 4

[Naoki Hirata :nhirata (please use needinfo instead of cc)]

Verified:

Mozilla/5.0 (Maemo;Linux armv71; rv:2.0b8pre)Gecko/20101011 Firefox/4.0b8pre Fennec/4.0b2pre