199289 - Browser hangs when smooth scrolling is activated

Status: VERIFIED FIXED

(Core :: Web Painting, defect)

Description

[Torben]

Build ID: 2003032508 and 2003032416

I have been testing smooth scrolling a little, however twice (different pages)
the browser has hung and had to be terminated with Ctrl-Alt-Del :-( I have not
been able to reproduce this hang with smooth scrolling disabled, so I am 99%
sure it is related. Will test more and report back if I am wrong.

Comment 1

[Pieter ter Borg]

I can confirm this problem with smooth scrolling activated in Phoenix (20030324)
on W95.

Comment 2

[Pieter ter Borg]

I can confirm this problem with smooth scrolling activated in Phoenix (20030324)
on W95.

Comment 3

[Hermann Schwab]

Build ID 2003032604 had a hang after enabling smooth scrolling in about:config,
while I still was resetting some other unused variables in about:config.
I had to kill mozilla, so changes were not stored, and I didn´t retry.

Comment 4

[Neil Cronin]

I've been running this patch for several months on linux and nt, and I have
never seen this happen.

this must be windows 95 specific.

Comment 5

[Hermann Schwab]

Forget to tell Win98 with SP1, noname grafics (SiS 6326 / 8 MB ) running @ 800x600

Comment 6

[Torben]

Confirming since other also see this.

Comment 7

[Robert O'Callahan (:roc) (email my personal email if necessary)]

Can you describe the problem more? Does it just hang at a random time, or does
it hang after you do some specific operation?

Comment 8

[Hendrik Pagenhardt]

I've seen this behavior since the first smooth scrolling enabled build on two
Win98SE computers. What I see however is, that the browser recovers from such a
hang without intervention after a few seconds (like about 10-15 on an Athlon
1200). The processor is completely busy during this time, but other application
continue to work normal. The trigger for the hangs seems to be (at least for me)
scrolling on a page using the mouse wheel. It's not reproducible, but happens a
few times a day with medium usage of Mozilla.

Comment 9

[Torben]

For me this also happens when I scroll with the mouse wheel. Unlike comment 8 my
computer has not recovered in a reasonable time, but since my computer is
starved both on memory (64 MB) and processor force (Pentium II 350) I might not
have waited long enough. Will investigate more.

In case it matters: Matrox G100 graphics, 4 MB, @ 1024 x 768.

Comment 10

[Mattias Holmlund]

I'm seeing the exact same symptoms as in comment #8. Mozilla is completely
stalled and doesn't update any of it's windows. CPU is running at 100%. After
5-10 seconds mozilla resumes normal functionality again. The error seems to be
triggered by using the scroll-wheel. I updated to Logitech Mouseware 9.75
(because of bug 27667), installed this mozilla build and enabled smooth scroll
at about the same time, so I can't really tell if it's the build, smooth scroll
or maybe even mouseware that triggers the problem.

It happens about ten times per day for me.

Win NT4.0, SP6. Mozilla build 2003032611.

Comment 11

[Torben]

I just had this happen again and, yes, the browser do recover. Unfortuneately on
my machine this takes 2-3 minuttes.

Comment 12

[Robert O'Callahan (:roc) (email my personal email if necessary)]

I've located this bug. Patch coming.

Comment 13

[Paul Bergsagel]

I believe the bug effects more than the Win 95 platform. I am experiencing it
with MacOS X 10.1.5 using the latested trunk build with smooth scrolling
enabled. The bug disappears when smooth scrolling is disabled.

If it helps I am using a Wacom drawing tablet with the wireless mouse.

Comment 14

[Thorsten Gebuhr]

I just had this hang on Win2000.

I used the mouse-wheel to scroll over a side with a lot of flash-animations.
Suddenly the browser hung and I stopped it via Taskmanager after about 20s.

CPU-usage was 100% and the browser windows wasn't refreshed any more.

Comment 15

[Robert O'Callahan (:roc) (email my personal email if necessary)]

This should be fixed due to a checkin I made this morning. Please reopen if not so.

Comment 16

[Torben]

*** Bug 201156 has been marked as a duplicate of this bug. ***

Comment 17

[Torben]

I have not seen this since the fix was checked in. Verifying.