49674 - pressing Ctrl and spinning the mouse wheel up very fast crashes my xserver.

Status: RESOLVED DUPLICATE of bug 54963

(Core :: XUL, defect, P3)

Description

[onno]

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux 2.2.17-ide i686; en-US; m17) Gecko/20000807
BuildID:    2000080712

Just pressing Ctrl and spinning the mouse wheel up very fast crashes my xserver.

Reproducible: Always
Steps to Reproduce:
Hold down control and turn the wheel of the mouse fast up...

Actual Results:  x server crash

Expected Results:  font change

Comment 1

[Blake Ross]

->xpt, bryner, janc

Comment 2

[Blake Ross]

Adding crash keyword to all open crashers

Comment 3

[Jan Carpenter]

Changing summary to intelligible sentence.

Changing status to NEW.  Crashed my x-server big time.

Comment 4

[Jan Carpenter]

nominating for nsbeta3
This bug horked my /dev/hda1 drive and I now have to re-build it.  Also, it's 
*extremely easy* to reproduce.

Comment 5

[Brian Ryner (not reading)]

This honestly sounds like a bug in the X server, not sure if there's all that 
much we can do about that.  However, I believe the current plan is to remove the 
mousewheel font change option once a keyboard shortcut exists... which will work 
around the problem.

CC'ing pavlov to see if he has any ideas.

janc, what video card and X server are you using?

Comment 6

[Peter Trudelle]

Brian, you already have a bug for that work, right?  We should certainly test
this scenario once that work is done.

Comment 7

[Peter Trudelle]

Brian?

Comment 8

[Brian Ryner (not reading)]

Well, the ctrl-mousewheel font change is disabled now by default.  Haven't
tested whether this is still reproduceable if you manually enable it, but I
don't think this is really a big issue.

Comment 9

[Matthew T (active 1999-2002)]

I think the problem is with the font-changing mechanism, rather than the 
mousewheel or the X server. Peter Anemma was telling me in #mozilla that his work 
on implementing font zoom was exposing a number of bugs, at least one of them 
being a crasher. I don't know if he's on Linux. (Nor do I know his address to CC. 
Sorry.)

Comment 10

[Peter Trudelle]

janc: can you still reproduce this?

Comment 11

[Peter Trudelle]

nsbeta3-/future

Comment 12

[Brian Ryner (not reading)]

i still suspect this is not a mousewheel bug at all, but hopefully we can
resolve this by mozilla 1.0.

Comment 13

[Peter "jag" Annema]

Could the problem here be the same as when you try to zoom to 60,000%?
X renders (scaled?) fonts through bitmaps, will sliding through a lot of font
scales cause a lot of memory to be allocated as X tries to keep up?

Comment 14

[Brian Ryner (not reading)]

I think this is very likely the same problem.


*** This bug has been marked as a duplicate of 54963 ***