On Mon, May 13, 2013 at 04:41:01PM -0400, Chuck Lever wrote:
>
> On May 13, 2013, at 4:35 PM, "Darrick J. Wong" <darrick.wong@xxxxxxxxxx> wrote:
>
> > Hi there,
> >
> > I've a question about a recent nfs client commit
> > (4580a92d44e2b21c2254fa5fef0f1bfb43c82318).
> >
> > I have a kvm-based testing setup that netboots VMs over NFS, the client end of
> > which seems to have broken somehow in 3.10-rc1. The server's exports file
> > looks like this:
> >
> > /storage/mtr/x64 192.168.122.0/24(ro,sync,no_root_squash,no_subtree_check)
> >
> > On the client end (inside the VM), the initrd runs the following command to
> > try to mount the rootfs over NFS:
> >
> > # mount -o nolock -o ro -o retrans=10 192.168.122.1:/storage/mtr/x64/ /root
> >
> > (Note: This is the busybox mount command.)
> >
> > The mount fails with -EINVAL; using rpcdebug to turn on all rpc/nfs debugging
> > yields this in dmesg:
> >
> > [ 28.298869] --> nfs_init_server()
> > [ 28.299874] --> nfs_get_client(192.168.122.1,v3)
> > [ 28.300839] RPC: looking up machine cred for service *
> > [ 28.301666] RPC: set up xprt to 192.168.122.1 (port 2049) via tcp
> > [ 28.302713] RPC: created transport ffff88007b64c000 with 65536 slots
> > [ 28.304263] RPC: creating nfs client for 192.168.122.1 (xprt ffff88007b64c000)
> > [ 28.306791] RPC: creating UNIX authenticator for client ffff8800379ac800
> > [ 28.308379] RPC: new task initialized, procpid 250
> > [ 28.309427] RPC: allocated task ffff88003785de00
> > [ 28.310427] RPC: 2 __rpc_execute flags=0x680
> > [ 28.311389] RPC: 2 call_start nfs3 proc NULL (sync)
> > [ 28.312507] RPC: 2 call_reserve (status 0)
> > [ 28.313456] RPC: 2 reserved req ffff8800379acc00 xid 0807e503
> > [ 28.314663] RPC: wake_up_first(ffff88007b64c190 "xprt_sending")
> > [ 28.315928] RPC: 2 call_reserveresult (status 0)
> > [ 28.316958] RPC: 2 call_refresh (status 0)
> > [ 28.317908] RPC: 2 holding NULL cred ffffffff81a8ca40
> > [ 28.319496] RPC: 2 refreshing NULL cred ffffffff81a8ca40
> > [ 28.322685] RPC: 2 call_refreshresult (status 0)
> > [ 28.323584] RPC: 2 call_allocate (status 0)
> > [ 28.324422] RPC: 2 allocated buffer of size 96 at ffff88007b64d000
> > [ 28.325440] RPC: 2 call_bind (status 0)
> > [ 28.326159] RPC: 2 call_connect xprt ffff88007b64c000 is not connected
> > [ 28.327261] RPC: 2 xprt_connect xprt ffff88007b64c000 is not connected
> > [ 28.328267] RPC: 2 sleep_on(queue "xprt_pending" time 4294899378)
> > [ 28.330278] RPC: 2 added to queue ffff88007b64c258 "xprt_pending"
> > [ 28.332390] RPC: 2 setting alarm for 700 ms
> > [ 28.333979] RPC: xs_connect scheduled xprt ffff88007b64c000
> > [ 28.336093] RPC: xs_bind 0.0.0.0:785: ok (0)
> > [ 28.337671] RPC: worker connecting xprt ffff88007b64c000 via tcp to 192.168.122.1 (port 2049)
> > [ 28.340639] RPC: 2 sync task going to sleep
> > [ 28.342523] RPC: xs_tcp_state_change client ffff88007b64c000...
> > [ 28.344517] RPC: state 1 conn 0 dead 0 zapped 1 sk_shutdown 0
> > [ 28.346451] RPC: 2 __rpc_wake_up_task (now 4294899382)
> > [ 28.348203] RPC: 2 disabling timer
> > [ 28.349506] RPC: 2 removed from queue ffff88007b64c258 "xprt_pending"
> > [ 28.353656] RPC: __rpc_wake_up_task done
> > [ 28.353669] RPC: 2 sync task resuming
> > [ 28.353670] RPC: 2 xprt_connect_status: retrying
> > [ 28.353671] RPC: 2 call_connect_status (status -11)
> > [ 28.353673] RPC: 2 call_transmit (status 0)
> > [ 28.353673] RPC: 2 xprt_prepare_transmit
> > [ 28.380891] RPC: 2 rpc_xdr_encode (status 0)
> > [ 28.381876] RPC: ffff88007b64c000 connect status 115 connected 1 sock state 1
> > [ 28.386321] RPC: 2 marshaling NULL cred ffffffff81a8ca40
> > [ 28.387616] RPC: 2 using AUTH_NULL cred ffffffff81a8ca40 to wrap rpc data
> > [ 28.389654] RPC: 2 xprt_transmit(44)
> > [ 28.391105] RPC: xs_tcp_send_request(44) = 44
> > [ 28.391968] RPC: xs_tcp_data_ready...
> > [ 28.391970] RPC: xs_tcp_data_recv started
> > [ 28.391971] RPC: reading TCP record fragment of length 24
> > [ 28.391972] RPC: reading XID (4 bytes)
> > [ 28.391974] RPC: reading request with XID 0807e503
> > [ 28.391975] RPC: reading CALL/REPLY flag (4 bytes)
> > [ 28.391976] RPC: read reply XID 0807e503
> > [ 28.391977] RPC: XID 0807e503 read 16 bytes
> > [ 28.391978] RPC: xprt = ffff88007b64c000, tcp_copied = 24, tcp_offset = 24, tcp_reclen = 24
> > [ 28.391980] RPC: 2 xid 0807e503 complete (24 bytes received)
> > [ 28.391981] RPC: xs_tcp_data_recv done
> > [ 28.411740] RPC: 2 xmit complete
> > [ 28.412933] RPC: wake_up_first(ffff88007b64c190 "xprt_sending")
> > [ 28.414312] RPC: 2 call_status (status 24)
> > [ 28.417274] RPC: 2 call_decode (status 24)
> > [ 28.418798] RPC: 2 validating NULL cred ffffffff81a8ca40
> > [ 28.420611] RPC: 2 using AUTH_NULL cred ffffffff81a8ca40 to unwrap rpc data
> > [ 28.423049] RPC: 2 call_decode result 0
> > [ 28.424544] RPC: 2 return 0, status 0
> > [ 28.425971] RPC: 2 release task
> > [ 28.427287] RPC: freeing buffer of size 96 at ffff88007b64d000
> > [ 28.429270] RPC: 2 release request ffff8800379acc00
> > [ 28.430915] RPC: wake_up_first(ffff88007b64c320 "xprt_backlog")
> > [ 28.432894] RPC: rpc_release_client(ffff8800379ac800)
> > [ 28.434631] RPC: 2 freeing task
> > [ 28.435881] RPC: creating nfs client for 192.168.122.1 (xprt ffff88007b64c000)
> > [ 28.438469] RPC: Couldn't create auth handle (flavor 8)
> > [ 28.487427] RPC: __rpc_clone_client: returned error -22
> > [ 28.489314] nfs_init_server_rpcclient: couldn't create rpc_client!
> > [ 28.491316] --> nfs_put_client({1})
> > [ 28.492597] --> nfs_free_client(3)
> > [ 28.493765] RPC: shutting down nfs client for 192.168.122.1
> > [ 28.495703] RPC: rpc_release_client(ffff8800379ac800)
> > [ 28.497492] RPC: destroying UNIX authenticator ffffffff81a8cae0
> > [ 28.499473] RPC: destroying nfs client for 192.168.122.1
> > [ 28.501329] RPC: destroying transport ffff88007b64c000
> > [ 28.503042] RPC: xs_destroy xprt ffff88007b64c000
> > [ 28.504776] RPC: xs_close xprt ffff88007b64c000
> > [ 28.506572] RPC: disconnected transport ffff88007b64c000
> > [ 28.508885] <-- nfs_free_client()
> > [ 28.510585] <-- nfs_init_server() = xerror -22
> > [ 28.512353] --> nfs_free_server()
> > [ 28.513692] <-- nfs_free_server()
> > mount: Invalid argument
> >
> > It looks as though it's trying to create a RPC auth somethingorother (I'm no
> > NFS expert) of type RPC_AUTH_MAXFLAVOR, which afaict isn't a real auth flavor.
>
> RPC_AUTH_MAXFLAVOR means no "sec=" was specified on the mount command line.
> Some part of this logic is allowing that flavor to leak past the initial
> mount code.
<nod> I tried mounting with -o sec=sys but it didn't change the outcome...
> > The creation fails, and therefore the mount also fails. I noticed, however, if
> > I revert the first stanza of the patch so that "data->auth_flavors[0] =
> > RPC_AUTH_UNIX;", the mount works fine again. After putting that back, I read
> > the commit message attached to this patch and changed exports to read as
> > follows:
> >
> > /storage/mtr/x64 192.168.122.0/24(ro,sync,no_root_squash,no_subtree_check,sec=sys)
> >
> > and restarted the nfs server. Unfortunately, even with this sec=sys bit tacked
> > on, I still see the message "Couldn't create auth handle (flavor 8)".
> >
> > Note: This is an initramfs environment, there's no statd running. There
> > doesn't seem to be a portmapper either.
> >
> > So, um... help? I'm not sure what's going on here -- is this a bug in the
> > kernel, or something messed up with the nfsd config? The host is 3.9, the VM
> > client is 3.10.
>
> Darrick, exactly which kernel is running in your VM?
HEAD is 1f638766ffcd9f08209afcabb3e2df961552fe18 from Linus' tree.
> Dros, do you know if your changes are also applied to Darrick's kernel, or
> might be relevant here? If they haven't been applied, Darrick should
> probably sync up to the latest before we start debugging.
--D
>
> --
> Chuck Lever
> chuck[dot]lever[at]oracle[dot]com
>
>
>
>
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