Please describe the problem:
I tried to connect to a smb share on a windows pc which hang forever in
the connection dialog and also stalled any other nautilus operations,
e.g. clicking on desktop icons... 
After several retries with killing nautilus and restarting I gave up on
connecting to the smb share and logged out. 

The log out of gnome also hang forever and I therefore killed it with
ctrl-alt-bkspc. 

After a new log in nautilus did not come up again :-(

Steps to reproduce:
I don't knoe if the problem can be reproduced because since then I never could
start nautilus again.

Eventually the following will lead to the problem
1. Connect to a non existent smb share
2. Wait until nautilus hangs forever
3. Kill nautilus in the command line
4. Repeat steps 1-3 until nautlius no longer starts


Actual results:
Nautilus just hangs therefore it is unusable, e.g. no icons and gnome save as
dialogs also hang forever.

Expected results:
Normal nautilus startup.

Does this happen every time?
Yes

Other information:
nautilus -c hangs forever after printing: 

running nautilus_self_check_search_uri 
running nautilus_self_check_file_utilities 
running nautilus_self_check_file_operations 
running nautilus_self_check_directory 

and the last few lines of an strace of the hanging nautilus shows: 

[...] 
rt_sigsuspend([] <unfinished ...> 
--- SIGRTMIN (Unknown signal 32) @ 0 (0) --- 
<... rt_sigsuspend resumed> ) = -1 EINTR (Interrupted system call) 
sigreturn() = ? (mask now [RTMIN]) 
rt_sigprocmask(SIG_SETMASK, NULL, [RTMIN], Cool = 0 
rt_sigsuspend([] <unfinished ...> 

Running bonobo-slay did not solve it.