Re: [PATCH] sunrpc: set cl_max_connect when cloning an rpc_clnt

[Scott Mayhew <smayhew@redhat.com>]

On Mon, 06 Jun 2022, Anna Schumaker wrote:

> Hi Scott,
> 
> On Wed, Jun 1, 2022 at 1:34 PM Scott Mayhew <smayhew@redhat.com> wrote:
> >
> > If the initial attempt at trunking detection using the krb5i auth flavor
> > fails with -EACCES, -NFS4ERR_CLID_INUSE, or -NFS4ERR_WRONGSEC, then the
> > NFS client tries again using auth_sys, cloning the rpc_clnt in the
> > process.  If this second attempt at trunking detection succeeds, then
> > the resulting nfs_client->cl_rpcclient winds up having cl_max_connect=0
> > and subsequent attempts to add additional transport connections to the
> > rpc_clnt will fail with a message similar to the following being logged:
> >
> > [502044.312640] SUNRPC: reached max allowed number (0) did not add
> > transport to server: 192.168.122.3
> 
> Good catch! I was wondering if you could give me a "Fixes:" tag so it
> can be backported to stable?

Fixes: dc48e0abee24 ("SUNRPC enforce creation of no more than max_connect xprts")

> 
> Thanks,
> Anna
> 
> >
> > Signed-off-by: Scott Mayhew <smayhew@redhat.com>
> > ---
> >  net/sunrpc/clnt.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
> > index e2c6eca0271b..b6781ada3aa8 100644
> > --- a/net/sunrpc/clnt.c
> > +++ b/net/sunrpc/clnt.c
> > @@ -651,6 +651,7 @@ static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args,
> >         new->cl_discrtry = clnt->cl_discrtry;
> >         new->cl_chatty = clnt->cl_chatty;
> >         new->cl_principal = clnt->cl_principal;
> > +       new->cl_max_connect = clnt->cl_max_connect;
> >         return new;
> >
> >  out_err:
> > --
> > 2.35.3
> >
>