uma_zalloc_arg complaining about non-sleepable locks

[Peter Jeremy]

On 2010-Jan-26 15:10:59 -0500, John Baldwin <jhb at freebsd.org> wrote:
>On Tuesday 26 January 2010 1:37:56 pm Marius Strobl wrote:
>> On Tue, Jan 26, 2010 at 09:46:44AM -0500, John Baldwin wrote:
>> > On Tuesday 26 January 2010 2:33:37 am Peter Jeremy wrote:
>> > > I have just upgraded to 8-STABLE/amd64 from about 18 hours ago and am
>> > > now getting regular (the following pair of messages about every
>> > > minute) compaints as follows:
>> > > 
>> > > kernel: uma_zalloc_arg: zone "mbuf" with the following non-sleepable locks held:
>> > > kernel: exclusive sleep mutex sp_lock (sp_lock) r = 0 (0xffffff000460bb00) locked @ /usr/src/sys/rpc/svc.c:1098
...
>> Could you please give the following patch a try?
>> http://people.freebsd.org/~marius/fha_extract_info_realign2.diff

That seems to have fixed it - I've booted the new kernel and generated
some NFS activity and am not getting any messages.  Also,
vfs.nfs.realign_test is incrementing nicely though
vfs.nfs.realign_count remains at zero.

>Hmm, the old code was already using M_DONTWAIT, so now I don't see why you
>were getting the witness warning.

Actually, there were two nfs_realign() definitions in the kernel - one
in nfsclient/nfs_krpc.c (which used M_DONTWAIT) and another in
nfsserver/nfs_srvkrpc.c (which used M_WAIT).  It was the server code
that was being exercised here.

-- 
Peter Jeremy
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