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SubjectRe: test10-pre4: deadlock in VM?
Found a strange one.

getblk releases hash_table_lock and lru_list_lock
before calling refill_freelist that calls grow_buffers
that locks free_list[].lock
- lru_lock and hash_table_lock not held, violating
deadlock prevention rules in beginning of file.

patch.
in getblk move the call to refill_freelist before
releasing the locks - ok?

/RogerL


Roger Larsson wrote:
>
> Hi,
>
> I noted that even try_to_free_buffers locks lru_list_lock.
> Then it tries to lock some others - maybe one of the other treads
> got one of those (hash_table_lock, free_list[index].lock)
> It fits with that proc 4 it executes in the beginning of
> try_to_free_buffers, does it move?
> Or is it stuck at a spin lock there - which one? disassembly of
> try_to_free_buffers?
>
> /RogerL
>
> Rajagopal Ananthanarayanan wrote:
> >
> > Tigran Aivazian wrote:
> > >
> > > Hi guys,
> > >
> > > When running SPEC SFS tests against 2.4.0-test10-pre4 on a 4-way SMP
> > > machine with 6G RAM (highmem+PAE enabled) I got
> > >
> > > __alloc_pages: 0-order allocation failed.
> > >
> > > (probably coming from nfsd, why don't we print eip of the caller there?)
> > >
> > > and the machine locked up (but pingable). So I entered kdb and got stack
> > > traces of all running proceeses:
> >
> > Hmm. It appears that some of the processes are stuck on this
> > part of page_launder:
> >
> > /*
> > * Re-take the spinlock. Note that we cannot
> > * unlock the page yet since we're still
> > * accessing the page_struct here...
> > */
> > spin_lock(&pagemap_lru_lock);
> >
> > It will be interesting to see what's going on in each of the cpus.
> > Use "cpu x" x=0,1,2,3 on your 4 cpu system to switch to cpu x,
> > and just type "bt" on each cpu. Also, it will be good to see what
> > kswapd (pid 2) is upto ...
> >
> > --------------------------------------------------------------------------
> > Rajagopal Ananthanarayanan ("ananth")
> > Member Technical Staff, SGI.
> > --------------------------------------------------------------------------
> > -
> > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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> > Please read the FAQ at http://www.tux.org/lkml/
>
> --
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