'swap_pager: indefinite wait buffer' with swapfile

[Kris Kennaway]

On Tue, Sep 13, 2005 at 03:00:41PM -0700, Matthew Dillon wrote:
> 
> :
> :
> :--bp/iNruPH9dso1Pn
> :Content-Type: text/plain; charset=us-ascii
> :Content-Disposition: inline
> :
> :I configured a vnode-backed md and enabled swapping on it.  A few
> :hours later after moderate swap use the console showed:
> :
> :swap_pager: indefinite wait buffer: bufobj: 0, blkno: 889347, size: 8192
> :[...repeated...]
> :
> :The backing store was a sparse file, but there was ample space:
> 
>     This is likely your problem.  Do NOT use a sparse file for file-backed
>     swap.

Unfortunately making the file non-sparse did not cure the deadlock.
Since it's a heavily loaded 14-processor machine it's difficult to
trace every process to look for activity out of the ordinary.

Kris
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