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codesite | 20 Sep 2012 22:12
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Issue 515 in xmonad: XMonad freezes occasionally when using Gridselect (XMonadContrib)

Status: New
Owner: ----

New issue 515 by bmathiasen: XMonad freezes occasionally when using  
Gridselect (XMonadContrib)
http://code.google.com/p/xmonad/issues/detail?id=515

What steps will reproduce the problem?
1. Toggling Gridselect (goToSelected/gridselectWorkspace)
2. Attempt to move to another window or workspace.

What is the expected output? What do you see instead?
Expected output: Normal 2D grid of windows/workspaces, that I can swap to  
using the keyboard.

What I see: The 2D grid opens, but any subsequent input from the keyboard  
will occasionally cause XMonad to freeze; windows and workspaces will  
become unresponsive. It is possible to go to another tty to kill xmonad,  
after which a WM can be launched on the appropriate display.

What version of the product are you using? On what operating system?
XMonad version 0.10 (built from source, package manager, and Cabal) on the  
following OS's:
- LinuxMint (DebianTesting edition) using XFCE4.
- Xubuntu (11.10 and 12.04).
- Ubuntu (12.04).

All setups tried on two separate laptops, Lenovo Thinkpad X220 and T400s.

Are you using an xmonad.hs?  Please attach it and the output of "xmonad
(Continue reading)

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codesite | 21 Sep 2012 08:13
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Re: Issue 515 in xmonad: XMonad freezes occasionally when using Gridselect (XMonadContrib)


Comment #1 on issue 515 by daniel.w...@...: XMonad freezes  
occasionally when using Gridselect (XMonadContrib)
http://code.google.com/p/xmonad/issues/detail?id=515

Have you had a look at  
http://www.haskell.org/haskellwiki/Xmonad/Frequently_asked_questions#XMonad_is_frozen.21  
yet?
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codesite | 22 Sep 2012 15:50
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Re: Issue 515 in xmonad: XMonad freezes occasionally when using Gridselect (XMonadContrib)


Comment #2 on issue 515 by bmathiasen: XMonad freezes occasionally when  
using Gridselect (XMonadContrib)
http://code.google.com/p/xmonad/issues/detail?id=515

Except for the 'xclock'-method, I've tried (and failed) the other methods,  
excluding xmobar/statusbar as I don't use those.

I'll try 'xclock'-method, and post any updates as soon as I get them.
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codesite | 22 Sep 2012 16:12
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Re: Issue 515 in xmonad: XMonad freezes occasionally when using Gridselect (XMonadContrib)


Comment #3 on issue 515 by bmathiasen: XMonad freezes occasionally when  
using Gridselect (XMonadContrib)
http://code.google.com/p/xmonad/issues/detail?id=515

xclock didn't help.
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codesite | 2 Oct 2012 01:19
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Re: Issue 515 in xmonad: XMonad freezes occasionally when using Gridselect (XMonadContrib)


Comment #4 on issue 515 by thomas.a...@...: XMonad freezes  
occasionally when using Gridselect (XMonadContrib)
http://code.google.com/p/xmonad/issues/detail?id=515

It won't help you.  The problem is obvious.  When the GridSelect windows  
are displayed, the XServer is grabbed, presumably for the keyboard input  
although I've not checked the exact reasons why the XServer is grabbed in  
this case.
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codesite | 11 Oct 2012 08:44
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Re: Issue 515 in xmonad: XMonad freezes occasionally when using Gridselect (XMonadContrib)


Comment #5 on issue 515 by bmathiasen: XMonad freezes occasionally when  
using Gridselect (XMonadContrib)
http://code.google.com/p/xmonad/issues/detail?id=515

If that is the case, surely every user of Gridselect should experience this?
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codesite | 11 Oct 2012 16:14
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Re: Issue 515 in xmonad: XMonad freezes occasionally when using Gridselect (XMonadContrib)


Comment #6 on issue 515 by allber...@...: XMonad freezes
occasionally  
when using Gridselect (XMonadContrib)
http://code.google.com/p/xmonad/issues/detail?id=515

You won't see it 100% consistently; even the infamous putSelect wasn't 100%  
consistent.

I just went through the GridSelect code.  There is no full server grab; the  
keyboard and one mouse button are grabbed, though.  Beyond this, the issue  
is that xmonad is not processing events in its main loop, and this means

(a) it cannot do things like switching workspaces;
(b) events that GridSelect does not expect are simply dropped, meaning:
(c) new windows will completely fail to do the window management process;
(d) other potentially important X11 events and negotiations are dropped on  
the floor.

Which means that there are a number of ways that GridSelect can lead to  
gridlock with either clients or the X11 server.  If you pick your selection  
quickly, you likely won't notice; the longer GridSelect stays up, and the  
more things that happen while it's up, the more likely that xmonad will  
drop/ignore something critical.
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codesite | 12 Nov 2012 11:17
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Re: Issue 515 in xmonad: XMonad freezes occasionally when using Gridselect (XMonadContrib)


Comment #7 on issue 515 by bmathiasen: XMonad freezes occasionally when  
using Gridselect (XMonadContrib)
http://code.google.com/p/xmonad/issues/detail?id=515

Thanks for the elaborate response.

Just to bring a status update: XMonad doesn't seem to freeze on Arch (hope  
i don't jinx it ;).  Both systems have xmonad/+contrib installed through  
cabal and run identical xmonad.hs.

Here's some output from 'X -version' on my two currently running systems,  
in case it makes any difference:

Mint (debian) 'X -version':
X.Org X Server 1.12.1.902 (1.12.2 RC 2)
Release Date: 2012-05-19
X Protocol Version 11, Revision 0
Build Operating System: Linux 3.2.0-2-amd64 x86_64 Debian
Current Operating System: Linux none 3.2.0-3-amd64 #1 SMP Thu Jun 28  
09:07:26 UTC 2012 x86_64
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.2.0-3-amd64  
root=UUID=6cdaef22-3035-4c99-af66-553e95dcd62e ro quiet
Build Date: 20 May 2012  08:57:17AM
xorg-server 2:1.12.1.902-1 (Cyril Brulebois <kibi@...>)
Current version of pixman: 0.26.0

Arch 'X -version':
X.Org X Server 1.12.3.901 (1.12.4 RC 1)
Release Date: 1012-08-03
(Continue reading)

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codesite | 17 Nov 2012 11:19
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Re: Issue 515 in xmonad: XMonad freezes occasionally when using Gridselect (XMonadContrib)


Comment #8 on issue 515 by bmathiasen: XMonad freezes occasionally when  
using Gridselect (XMonadContrib)
http://code.google.com/p/xmonad/issues/detail?id=515

Nevermind, that was a false positive.  Freezing still occurs.  I'll attempt  
stracing the process.
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Gmane