117724 - system hang if I try to scroll a web page while it is still loading

Status: RESOLVED DUPLICATE of bug 120893

(Core :: Layout, defect, P3)

Description

[Mikael Suomela]

From Bugzilla Helper:
User-Agent: Mozilla/4.0 (compatible; MSIE 5.5; Windows 98)
BuildID:    2001122106

Mozilla freezes the whole system if I try to scroll web pages while the page(s) 
are still loading. 

Reproducible: Always
Steps to Reproduce:
1. Go to some URL
2. Start scrolling while the page is still loading
3.

Comment 1

[Erik]

Wfm using Windows NT SP5 and 2002010608 on the following URL (which is _very_
large ;o) )

http://forum.herr-der-ringe-film.de/showflat.php?Cat=&Board=nurso&Number=140570&page=0&view=collapsed&sb=5&o=0&fpart=all

Dunring loading I can scroll several times up and down - no freeze or crash
occurs...
Connected to the net via LAN.

Comment 2

[Erik]

Sorry for beeing not very precise - I encounter several "hangs" for about 1 or 2
seconds, but then loading process goes. As mentioned above this repeats several
times until loading has finished... Perhaps it's just a question of processor speed?

Comment 3

[Mikael Suomela]

My Win98SE freezes totally...even the mouse goes out (which usually keeps on 
working after everything else freezes). The computer responds only to ctrl-alt-
del. Haven't tried to wait out for several minutes though.

Comment 4

[Peter Trudelle]

->layout

Comment 5

[sairuh (rarely reading bugmail)]

sending over to layout

Comment 6

[Marco Amrein]

I can confirm this with Win 2000 SP-2. Hardware is: Duron 750 on a SIS 730
Mainboard with on-board GFX.

When I go to www.sis.com, then click as fast as possibe onto "Support" on the
page's menu bar and then click as fast as possible onto "Driver Download" on the
Menu that's showing up on the left, then my computer completely freezes with
mouse before I can count to 5.

I can reproduce this with 0.9.7 and the latest nightly I tried. 0.9.6 does not
seem to have this bug.

The System Monitor shows no increase in Memory usage before the crash. Though
the crash seems to freeze the machine completely (including the mouse-pointer)
the machine remains pingable.

Comment 7

[Marco Amrein]

It remains to say that the second click in my example is in fact a scroll
because it points to an anchor in the same document.

Comment 8

[Marc Attinasi]

If the mouse-pinter is freezing, then the OS is hung.  Works OK for me on
Win2000 and Mac OSX.

Petersen, can you verify on Win98?

BTW: It could be that the test that Marco described is another bug.  I wonder if
the same hang can be made to happen by using the scroll bar to scroll instead of
the link navigation...

Comment 9

[Marco Amrein]

I just tried to reproduce my testcase using different OS and machines. All tests
were made with Mozilla 0.9.7:

Duron 750MHz on SIS 730 Motherboard:- Win 2000 SP2: testcase causes OS crash
- Win 98 SE: testcase causes OS crash- Linux Debian Sid: testcase works fine
Pentium 150MHz Toshiba Notebook:
- Win 98 SE: testcase works fine

I believe that a certain change between Mozilla 0.9.6 and 0.9.7 brings a bug in
the SIS Windows-* drivers to light in my case. Therefore it would be interesting
to see, what hardware Mikael is using and if he can reproduce his crashes with
0.9.6 and/or 0.9.7.

Comment 10

[rubydoo123]

UPDATE:

using the build from 20020116 on win98, I cannot reproduce the hang. I do see 
sluggish behavior while the hour glass is present. I'm using a Dell 220, 256 mb 
ram. Can anyone repro the hang easily?

Comment 11

[Chris Petersen]

I can't reproduce this hang either on Mac OS X (2002-01-24-03) or Windows ME
(2002-01-24-03) Jan 24th builds.

Comment 12

[kirun]

if this bug == 120893, I can reproduce it no problem.

Comment 13

[Marco Amrein]

Yes, 120893 is probably the same problem, I can trigger it on the same machines 
as this test case and it worksforme on my laptop as this test case.

Comment 14

[Chris Petersen]

*** This bug has been marked as a duplicate of 120893 ***