skiplist db corruption

[Bernhard Reiter]

On Monday 13 November 2006 03:59, Robert Mueller wrote:
> Just reviving an old issue to see if anyone has any more information.
>
> 
http://asg.web.cmu.edu/archive/message.php?mailbox=archive.cyrus-devel&msg=1072
>
> We still see this every now and then, most often with seen state databases.
> It's most often after an unclean shutdown, but I've seen it at other times
> as well. Has anyone got any more ideas on what might be causing this?

The linux people have found a long standing problem with mmap().
Citing from https://intevation.de/roundup/kolab/issue840:

This would fit our current observations that          
using mremap would be irrelevant and that these        
problems were not seen on FreeBSD or Solaris systems.        
        
References:       
See commit 7658cc289288b8ae7dd2c2224549a048431222b3    
Author: Linus Torvalds <torvalds at macmini.osdl.org>    
Date:   Fri Dec 29 10:00:58 2006 -0800    
    
    VM: Fix nasty and subtle race in shared mmap'ed page writeback    
in http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.20-rc3      
       
or the nice LWN article at:    
http://lwn.net/Articles/215868/    

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