[app_server] crash in Desktop::SetFocusWindow ()

[diver]

This is hrev38300 in VirtualBox 3.0.12.

On the first workspace I started Terminal with installoptionalpackage -l which consumed 100% of cpu. Then I launched WebPositive and the same moment it's window appeared on screen I clicked on the second workspace using workspaces replicant. Boom.

#5124 looks similar.

[diver]

I've just run into a similar issue in hrev45130. This time app_server crashed when I tried to reproduce screen_blanker crash by clicking Test button in ScreenSaver preflet several times either with Flurry or Gravity or screensaver selected. The crash is reproducible.

event loop , id: 105, state: Exception (Segment violation)
Frame		IP			Function Name
-----------------------------------------------
0x7019cce4	0x26fb69	Desktop::SetFocusWindow(Window*) + 0x195
[...]
0x7019cd34	0x26d3fc	Desktop::ActivateWindow(Window*) + 0x28c
0x7019cd74	0x3328de	StackAndTile::_ActivateWindow(SATWindow*) + 0xae
0x7019cda4	0x332230	StackAndTile::WindowActitvated(Window*) + 0x30
0x7019cdd4	0x275495	DesktopObservable::NotifyWindowActivated(Window*) + 0x51
0x7019ce24	0x26d1ed	Desktop::ActivateWindow(Window*) + 0x7d
0x7019ce84	0x2aadbe	Window::MouseDown(BMessage*, BPoint, ClickTarget&, &, ClickTarget&) + 0x13a
0x7019cef4	0x26aa26	MouseFilter::Filter(BMessage*, EventTarget*, void*, EventTarget*) + 0x1ea
0x7019cf84	0x27c5cd	EventDispatcher::_EventLoop() + 0x29d
0x7019cfb4	0x27cc3a	EventDispatcher::_event_looper(void*) + 0x1a
0x7019cfdc	0x8cc751	thread_entry + 0x21
00000000	0x7019cfec	?

[diver]

Never seen it after. Assuming fixed.

[nielx]

Assign tickets with status=closed and resolution=fixed within the R1/beta2 development window to the R1/beta2 Milestone

[diver]

According to https://dev.haiku-os.org/ticket/15728#comment:11 it's still reproducible in hrev54154+110.

[Pete]

If this is the same bug, it has resurfaced after 10 years! I have never experienced the crash with any revision before 54154. It has happened at least 3 times since. The app_server has also crashed a couple of times, in the same hrev, when starting Youtube from W+. I'd suspect a common cause.

[pulkomandy]

Hi, can anyone reporduce this crash? Or did the refactoring and fixes in app_server fixed it?

[pulkomandy]

Move unsolved issues to beta 4 since there is no chance of fixing them now.

[waddlesplash]

I would personally suspect memory corruption due to the alpha-mask issues. As it has not been apparently reproduced since, let's close it again.