Re: INFO: possible circular locking dependency detected

[Nick Piggin]

Randy Dunlap wrote:
> On Tue, 17 Oct 2006 00:32:44 +1000 Nick Piggin wrote:
>
>
> > alpha @ steudten Engineering wrote:
> >
> > > =======================================================
> > > [ INFO: possible circular locking dependency detected ]
> > > 2.6.18-1.2189self #1
> > > -------------------------------------------------------
> > > kswapd0/186 is trying to acquire lock:
> > > (&inode->i_mutex){--..}, at: [<c0326e32>] mutex_lock+0x21/0x24
> > >
> > > but task is already holding lock:
> > > (iprune_mutex){--..}, at: [<c0326e32>] mutex_lock+0x21/0x24
> > >
> > > which lock already depends on the new lock.
> >
> > Thanks. __grab_cache_page wants to clear __GFP_FS, because it is
> > holding the i_mutex so we don't want to reenter the filesystem in
> > page reclaim.
> >
> > This would be an easy two liner, except those funny page_cache_alloc
> > routines which take a mapping rather than a gfp_t argument :P
>
>
> and it would be only one email, but you forgot spaces there,
> so it's too ugly to use.  ;)  i.e., please add spaces around
> the '&'.
>
> and it's an attachment :(

Oh yeah, it was an attachment because I didn't want anyone to see how
ugly it is ;)

It's just a quick hack to see if it works. I'll send out a real patch
when I get time to code and test it properly.

--
SUSE Labs, Novell Inc.
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