On 13 Aug 2014, at 13:45, Christian Seiler wrote: > My question would be whether there is an easy way to debug this? > I tried to have a look at the kernel nfs4 client code / the > interaction with idmap, but I just don't know enough about that > area of the kernel to really see through the logic. Do you have access to the server? You can add -vvv to rpc.idmapd on the server side to see the upcalls it services from nfsd, and see the translations. I don't think nfsd uses nfsidmap (yet). Also turn up the debugging on rpc.gssd on the client (-vvv) and rpc.svcgssd on the server - you could be having GSS problems instead of idmapping problems. Ben -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html