30291 - dragging scrollbar while page disappears causes crash

Status: VERIFIED FIXED

(Core :: XUL, defect, P2)

Description

[David Baron :dbaron: (⌚️UTC-5, no longer working on Mozilla)]

DESCRIPTION:  I crash if I am dragging the scrollbar while the page I am
scrolling is taken from the display and a new one replaces it.

STEPS TO REPRODUCE:
 * load a page that has some (relatively) slow links on the right side of the page
 * click on a link somewhere near the scrollbar slider, and quickly move the
pointer to the scrollbar slider and drag on the slider, before it goes away

ACTUAL RESULTS:
 * crash

EXPECTED RESULTS:
 * no crash

DOES NOT WORK CORRECTLY ON:
 * Linux, mozilla, 2000-03-03-09-M15

Comment 1

[David Baron :dbaron: (⌚️UTC-5, no longer working on Mozilla)]

I'm nominating this for beta1, in the hopes that it might be easy to fix.  I
think this crash will affect users who try out the beta more than any other
groups of users/testers before, because there will be more people trying the
browser over slower connections and modems.  However, I realize it might not be
possible to fix for beta1.

Comment 2

[Peter Trudelle]

I can't reproduce this, at all on a network, even when accessing a slow remote
server that gives me time to drag the thumb. I think it is the kind of bug (odd
scenario, timing related, Linux/modem) that few end users will encounter. I
doubt very much that it is worth the risk of fixing for beta, although it should
be easy to tell from the Talkback logs if this is really encountered a lot.
Assigning to evaughan as p2 for m15

Comment 3

[Phil Peterson]

PDT-

Comment 4

[Sitsofe Wheeler]

I can get this to happen every time (Linux only). Move the scrollbar rapidly up
and down whilst (re)loading a page (e.g. mozilla.org). I see this on Linux
builds M14+.

Comment 5

[Tom Mraz]

Hmmm. It's the typical crash for me - I get this one very often. 
Here is the stack trace of Linux Build 2000030509:
#0  0x40fda04b in ?? ()
#1  0x4047df10 in nsWidget::DispatchMouseEvent ()
#2  0x4047e36e in nsWidget::OnMotionNotifySignal ()
#3  0x404822af in nsWindow::HandleGDKEvent ()
#4  0x4047451a in handle_gdk_event ()
#5  0x405d95cb in gdk_event_dispatch ()
#6  0x40607be6 in g_main_dispatch ()
#7  0x406081a1 in g_main_iterate ()
#8  0x40608341 in g_main_run ()
#9  0x4052d859 in gtk_main ()
#10 0x4046c3da in nsAppShell::Run ()
#11 0x4040ee92 in object.8 ()
#12 0x804b06c in JS_PushArguments ()
#13 0x804b39c in JS_PushArguments ()
#14 0x40221cb3 in __libc_start_main (main=0x804b210 <JS_PushArguments+7692>, 
    argc=1, argv=0xbffffbd4, init=0x8049124 <_init>, fini=0x804c190 <_fini>, 
    rtld_fini=0x4000a350 <_dl_fini>, stack_end=0xbffffbcc)
    at ../sysdeps/generic/libc-start.c:78

I can reproduce it any time.
I would be much more happier if it would be fixed soon :-)

Comment 6

[Christine Begle]

*** Bug 30404 has been marked as a duplicate of this bug. ***

Comment 7

[Christine Begle]

*** Bug 30404 has been marked as a duplicate of this bug. ***

Comment 8

[Stuart Parmenter]

stealing bug

Comment 9

[Stuart Parmenter]

fixed baby

Comment 10

[Tom Mraz]

This doesn't crash anymore for long time -> Verified