> On Feb 23, 2022, at 5:00 PM, Trond Myklebust <trondmy@xxxxxxxxxxxxxxx> wrote: > > On Wed, 2022-02-23 at 18:06 +0000, Chuck Lever III wrote: >> >> >>> On Feb 21, 2022, at 5:48 AM, Kurt Garloff <kurt@xxxxxxxxxx> wrote: >>> >>> Hi, >>> >>> On 21.02.22 10:31, Kurt Garloff wrote: >>>> Hi Olga, >>>> >>>> On 21.02.22 02:19, Kornievskaia, Olga wrote: >>>>> [...] >>>>> Is it possible for you to provide a network trace? >>>> >>>> Yes. >>>> >>>> Is tcpdump what you'd like to see? wireshark's dumpcap? >>>> Any NFS specific tracing tools I should be using? >>>> >>>> One trace with a working kernel and one with the broken one? >>> >>> Comparing the good and the bad trace ... >>> >>> mount -t nfs 192.168.155.74:/Public /mnt/Public >>> against Qnap 4.3.4.xxx NFS v4.1 server. >>> >>> Both do: >>> >>> Establish conn >>> NFS NULL (ack) >>> NFS EXCHANGE_ID (4.2 -> NFS4ERR_MINOR_VERS_MISMATCH) >>> Teardown and reestablish >>> NFS NULL (ack) >>> NFS EXCAHNGE_ID (4.1 -> ack) >>> NFS EXCAHNGE_ID (4.1 -> ack) >>> NFS CREATE_SESSION (ack) >>> NFS RECLAIM_COMPLETE (CB_NULL, ack) >>> NFS_SECINFO_NO_NAME (ack) >>> NFS PUTROOTFH|GETATTR (ack) >>> NFS GETATTR FH:0x62d40c52 (ack), 8 times >>> NFS ACCESS FH_ -x62d40c52 (denied md xt dl, alllowed rd lu) >>> NFS LOOKUP DH:0x62d40c52/Public (ack) >>> NFS LOOKUP DH:0x62d40c52/Public (ack) >>> NFS GETATTR FH:0x8ee88cee (ack), 3 times >>> >>> >>> Now the differences start: >>> >>> The fixed NFS client repeatedly gets ack back, the broken NFS >>> client gets >>> >>> NFS GETATTR FH:0x8ee88cee (NFS4ERR_DELAY), repeating forever (exp. >>> backoff) >> >> Any idea why the server is not able to respond properly to >> the GETATTR request? That seems like the root of the problem. >> > > The GETATTR is a request for fs_locations in order to probe for > alternative IP addresses. > > IIRC, some earlier implementations of knfsd had this response when the > mountd daemon wasn't configured to expect a referral upcall for that > location. knfsd, or mountd? Is there known to be a server-side fix available? -- Chuck Lever
