[xmonad] Segfault

[Jim Burton]

At Fri, 17 Apr 2009 02:15:33 -0700,
Don Stewart wrote:
> 
> jim:
> > At Wed, 1 Apr 2009 08:57:32 +0100 (BST),
> > Jim Burton wrote:
> > > 
> > > At Tue, 31 Mar 2009 18:23:49 -0500,
> > > Spencer Janssen wrote:
> > > >
> > > > On Tue, Mar 31, 2009 at 07:50:29AM +0100, Jim Burton wrote:
> > > > > Hi, I'm using xmonad 0.8.1, GHC 6.10, Ubuntu intrepid, and every now and
> > > > > then I get an X error immediately after logging in and am bounced back to
> > > > > the login screen. Logging in again normally works fine. Here is
> > > > > .xsession-errors from one of those occasions:
> > > > >
[snip]
> > >
> > 
> > Can anyone tell me how to get a stack trace when xmonad crashes or
> > otherwise diagnose my problem? The problem does indeed persist and I
> > don't know if it's a known bug etc.
> > 
> 
> The main way is to attach gdb to the core, and we'll see if it is in
> Haskell code (meaning a GHC bug or FFI binding error), or in X11 code (X
> bug?). 
> 

Hi Don, Thanks for your reply. I've never used gdb -- any advice on
what exactly I need to do? I think I need to start this from
.xinitrc as when xmonad crashes it does so on login so will it be
something like

# in .xinitrc
#$CABAL_BIN/xmonad 
gdb $CABAL_BIN/xmonad > ~/debug.txt 

?

> The most important thing is to list GHC versions, X11 versions, Haskell
> library versions, and to ensure it is clean build.
> 

I listed most of these already: GHC 6.10.1, X version is (the ubuntu
intrepid package) 1:7.4~5ubuntu3, xmonad 0.8.1 installed via cabal. Re
a clean build, I tried to upgrade/reinstall with cabal just now and it
fails when trying to install unix:

Building unix-2.3.2.0...
[ 1 of 21] Compiling System.Posix.User ( dist/build/System/Posix/User.hs, dist/build/System/Posix/User.o )
[ 2 of 21] Compiling System.Posix.Unistd ( dist/build/System/Posix/Unistd.hs, dist/build/System/Posix/Unistd.o )
[ 3 of 21] Compiling System.Posix.Time ( dist/build/System/Posix/Time.hs, dist/build/System/Posix/Time.o )
[ 4 of 21] Compiling System.Posix.Resource ( dist/build/System/Posix/Resource.hs, dist/build/System/Posix/Resource.o )
[ 5 of 21] Compiling System.Posix.Process.Internals ( System/Posix/Process/Internals.hs, dist/build/System/Posix/Process/Internals.o )

System/Posix/Process/Internals.hs:10:17:
    Module `GHC.Conc' does not export `Signal'
cabal: Error: some packages failed to install:
containers-0.2.0.1 failed during the building phase. The exception was:
exit: ExitFailure 1
directory-1.0.0.3 depends on unix-2.3.2.0 which failed to install.
process-1.0.1.1 depends on unix-2.3.2.0 which failed to install.
unix-2.3.2.0 failed during the building phase. The exception was:
exit: ExitFailure 1
xmonad-0.8.1 depends on unix-2.3.2.0 which failed to install.

> Then, narrow down the extensions you're using to find the smallest set
> that produces the error.

Let me know if it's useful to see my .xinitrc and xmonad.hs. I am using very few
extensions, just tabbed layout. I'll experiment with removing this.

Thanks,

Jim