On Wed, May 10, 2017 at 11:08:52AM +0200, Paul Menzel wrote: > On 05/08/17 15:18, Brian Foster wrote: > >>NFS doesn’t respond to a null call. > > > >What exactly is a NULL call? > > Sorry for not making that clear for non-NFS people. From *NFS > Version 3 Protocol Specification* [1]: > > >Procedure NULL does not do any work. It is made available to > >allow server response testing and timing. NFSD has a fixed number of threads for processing requests, so if one of them hangs in the filesystem while holding a lock, all of them are likely to eventually end up waiting for that lock, and there will be none left even to answer NULL requests. So this is a pretty normal symptom of a deadlock or similar problem. --b. -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
