On Wed, 2012-02-29 at 16:21 -0700, Orion Poplawski wrote: > On 02/29/2012 04:17 PM, J. Bruce Fields wrote: > > On Wed, Feb 29, 2012 at 03:29:36PM -0700, Orion Poplawski wrote: > >> Just starting today, one of our user's nfs mounted home directory > >> has started locking up. Client is Fedora 16 32-bit, server is > >> CentOS 5.7 32-bit. Have not seen this particular problem elsewhere > >> (yet). > >> > >> I captured this trace on the server after the hang: > >> > >> http://sw.cora.nwra.com/tmp/marie-nfs-home-lwang-hang.pcap > >> > >> 1 0.000000 10.10.20.15 -> 10.10.10.1 NFS V4 COMP Call<EMPTY> > >> PUTFH;GETATTR GETATTR > >> 2 0.000133 10.10.10.1 -> 10.10.20.15 NFS V4 COMP Reply (Call > >> In 1)<EMPTY> PUTFH;GETATTR GETATTR > >> 3 0.000421 10.10.20.15 -> 10.10.10.1 TCP 879> nfs [ACK] > >> Seq=137 Ack=225 Win=17738 Len=0 TSV=3584653 TSER=2438333196 > >> 4 0.000519 10.10.20.15 -> 10.10.10.1 NFS V4 COMP Call<EMPTY> > >> PUTFH;ACCESS ACCESS;GETATTR GETATTR > >> 5 0.000587 10.10.10.1 -> 10.10.20.15 NFS V4 COMP Reply (Call > >> In 4)<EMPTY> PUTFH;ACCESS ACCESS;GETATTR GETATTR[Unreassembled > >> Packet [incorrect TCP checksum]] > >> 6 0.040522 10.10.20.15 -> 10.10.10.1 TCP 879> nfs [ACK] > >> Seq=289 Ack=465 Win=17738 Len=0 TSV=3584694 TSER=2438333196 > >> 7 0.451636 10.10.20.15 -> 10.10.10.1 NFS V4 COMP Call<EMPTY> > >> PUTFH;SAVEFH SAVEFH;OPEN OPEN;DELEGRETURN DELEGRETURN;Unknown > > > > That looks weird. Looking at the pcap--ok, the "delegreturn" is a > > mistake, there's no delegreturn there. > > > >> 8 0.451892 10.10.10.1 -> 10.10.20.15 NFS V4 COMP Reply (Call > >> In 7)<EMPTY> PUTFH;SAVEFH SAVEFH;OPEN OPEN(10008) > > > > That probably means the server is waiting for the client to return a > > delegation. > > > > Either the server's confused about their being a delegation, or the > > client's failing to return one it should? > > As far as I can see from your trace, the client keeps trying to open the file '.history', and the server keeps replying with NFS4ERR_DELAY. There is nothing in the trace itself that can tell us why the server is delaying. Cheers Trond -- Trond Myklebust Linux NFS client maintainer NetApp Trond.Myklebust@xxxxxxxxxx www.netapp.com ��.n��������+%������w��{.n�����{��w��� jg��� �����ݢj����G���� ���j:+v���w�m������w�������h�����٥
