commit 8bc64034509474bee3fb7996b2a9e74c8bc27281
Author: Frank Ch. Eigler <fche@redhat.com>
Date:   Fri Oct 19 17:36:04 2018 -0400

    nfsd tapset: adapt nfsd.proc4.read probe to different kernel versions
    
    Here too an if(@defined($u)) is appropriate, just like in the .write case.

diff --git a/tapset/linux/nfsd.stp b/tapset/linux/nfsd.stp
index 2fe9b0f..674e3e3 100644
--- a/tapset/linux/nfsd.stp
+++ b/tapset/linux/nfsd.stp
@@ -567,10 +567,17 @@ probe nfsd.proc4.read = kernel.function("nfsd4_read").call !,
 	version = 4
 	fh = & @nfsd4_compound_state($cstate)->current_fh
 
-	count = $read->rd_length
-	offset = $read->rd_offset
-	vec = $rqstp->rq_vec
-	vlen = $read->rd_vlen
+        if (@defined($u)) {
+             count = $u->read->rd_length
+             offset = $u->read->rd_offset
+             vec = $rqstp->rq_vec
+             vlen = $u->read->rd_vlen
+        } else {
+             count = $read->rd_length
+             offset = $read->rd_offset
+             vec = $rqstp->rq_vec
+             vlen = $read->rd_vlen
+        }
 
 	uid = __rqstp_uid($rqstp)
 	gid = __rqstp_gid($rqstp)

commit 4e81610ae8c233d876f378cca8374e34cc2ee0e8
Author: Frank Ch. Eigler <fche@redhat.com>
Date:   Fri Oct 19 19:31:31 2018 -0400

    nfsd tapset: adapt nfsd.proc4.commit probe to different kernel versions
    
    Here too an if(@defined($u)) is appropriate, just like in
    every other case.  Audited remainder.

diff --git a/tapset/linux/nfsd.stp b/tapset/linux/nfsd.stp
index 674e3e3..aa04f24 100644
--- a/tapset/linux/nfsd.stp
+++ b/tapset/linux/nfsd.stp
@@ -852,8 +852,13 @@ probe nfsd.proc4.commit = kernel.function("nfsd4_commit").call !,
 	proto = $rqstp->rq_prot
 	version = 4
 	fh = & @nfsd4_compound_state($cstate)->current_fh
-	count = $commit->co_count 
-	offset = $commit->co_offset 
+        if (@defined($u)) {
+	    count = $u->commit->co_count 
+	    offset = $u->commit->co_offset
+        } else {
+   	    count = $commit->co_count 
+	    offset = $commit->co_offset
+        }
 
 	uid = __rqstp_uid($rqstp)
 	gid = __rqstp_gid($rqstp)