Violhaine Grimly Reporter
	Description • 8 years ago

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:46.0) Gecko/20100101 Firefox/46.0
Build ID: 20160504112515

Steps to reproduce:

Dual-screen computer, Gentoo based, KDE desktop.
Open FF46.0, open three tabs.
No need to go to any site.
Try to move one tab.


Actual results:

FF crashes immediately, displaying :

(firefox:19094): Gtk-CRITICAL **: gtk_clipboard_set_with_data: assertion 'targets != NULL' failed
[19094] ###!!! ABORT: Request 140.8: BadWindow (invalid Window parameter); 3 requests ago: file /var/tmp/portage/www-client/firefox-46.0/work/firefox-46.0/toolkit/xre/nsX11ErrorHandler.cpp, line 157
[19094] ###!!! ABORT: Request 140.8: BadWindow (invalid Window parameter); 3 requests ago: file /var/tmp/portage/www-client/firefox-46.0/work/firefox-46.0/toolkit/xre/nsX11ErrorHandler.cpp, line 157



Expected results:

Tab should be moved

	Loic
	Comment 1 • 8 years ago

Can you test with gfx.xrender.enabled=false in about:config (restart FF).

	Violhaine Grimly Reporter
	Comment 2 • 8 years ago

(In reply to Loic from comment #1)
> Can you test with gfx.xrender.enabled=false in about:config (restart FF).

Test done. Same problem.

	Violhaine Grimly Reporter
	Comment 3 • 8 years ago

I did another test, on the same computer, but without dual-head (shutdown, unplug second screen, boot).

Everything is fine, tabs get moved on the same FF window, to a new window, between windows without any trouble nor crash.

	Violhaine Grimly Reporter
	Comment 4 • 8 years ago

One more piece of data (just discovered it a few minutes ago).

It's not only moving tabs that crashes FF on the dual-head system. I tried to bookmark this page by drag'n drop of its URLs to some bookmark folder. FF crashed immediately.

	Loic
	Comment 5 • 8 years ago

It appears to be related to drag&drop elements in dual monitor machine.

Are you using Gtk3? Because FF46 has added the support of Gtk3 and there are many bugs with this new feature.

	Violhaine Grimly Reporter
	Comment 6 • 8 years ago

(In reply to Loic from comment #5)
> Are you using Gtk3? Because FF46 has added the support of Gtk3 and there are
> many bugs with this new feature.

I think I do - at least that looks like the default configuration options on Gentoo. I'm going to recompile FF46 forcing GTK2, just to check. It'll take some time...

	Violhaine Grimly Reporter
	Comment 7 • 8 years ago

FF46 recompiled with force-gtk2 useflag (Gentoo). No more crashes when drag'n droppping anything.

	Karl Tomlinson (:karlt)
	Comment 8 • 8 years ago

Could e10s have been enabled somehow?
Did you install GTK+ 3.20 from somewhere?

If so, this is bug 1264454.

	Violhaine Grimly Reporter
	Comment 9 • 8 years ago

(In reply to Karl Tomlinson (ni?:karlt) from comment #8)
> Could e10s have been enabled somehow?
> Did you install GTK+ 3.20 from somewhere?

GTK 2.24.29 and 3.18.7 installed. Gtk 3.20 not yet available on Gentoo

	Violhaine Grimly Reporter
	Comment 10 • 8 years ago

(In reply to Karl Tomlinson (ni?:karlt) from comment #8)
> Could e10s have been enabled somehow?

Not sure... How to I check this ?

	Loic
	Comment 11 • 8 years ago

Options > General, there is a checkbox about multiprocess (e10s). But e10s is not enabled by default in 46 so I doubt you'll see this option.

	Karl Tomlinson (:karlt)
	Comment 12 • 8 years ago

This may be the same issue as bug 1263703, which is GTK+ 3.10.8.
The circumstances are a little different because Developer Edition has e10s enabled by default, but e10s is probably not enabled here.

This is not bug 1264454.

	Violhaine Grimly Reporter
	Comment 13 • 8 years ago

(In reply to Karl Tomlinson (ni?:karlt) from comment #12)
> The circumstances are a little different because Developer Edition has e10s
> enabled by default, but e10s is probably not enabled here.

Indeed, e10s is disabled.