[rpms/nfs-utils] f43: nfsd: don't assume service is running when setting thread count to 0

[rpms/nfs-utils] f43: nfsd: don't assume service is running when setting thread count to 0

[Steve Dickson]

            A new commit has been pushed.

            Repo   : rpms/nfs-utils
            Branch : f43
            Commit : 6d551109350c57c59b02eb1998c2dd8407e96828
            Author : Steve Dickson <steved@redhat.com>
            Date   : 2026-06-16T08:10:13-04:00
            Stats  : +44/-1 in 2 file(s)
            URL    : https://src.fedoraproject.org/rpms/nfs-utils/c/6d551109350c57c59b02eb1998c2dd8407e96828?branch=f43

            Log:
            nfsd: don't assume service is running when setting thread count to 0

Signed-off-by: Steve Dickson <steved@redhat.com>

---
diff --git a/nfs-utils-2.8.7-nfsd-thread-count-zero.patch b/nfs-utils-2.8.7-nfsd-thread-count-zero.patch
new file mode 100644
index 0000000..e33ae6f
--- /dev/null
+++ b/nfs-utils-2.8.7-nfsd-thread-count-zero.patch
@@ -0,0 +1,39 @@
+commit f993f1ceb5c5ca68d62cbdc1f040d228d6d9a018
+Author: Scott Mayhew <smayhew@redhat.com>
+Date:   Tue Jun 16 06:57:20 2026 -0400
+
+    nfsd: don't assume service is running when setting thread count to 0
+    
+    Newer kernels return -EIO if you try to write to /proc/fs/nfsd/threads
+    and there are no active listeners.
+    
+    Signed-off-by: Scott Mayhew <smayhew@redhat.com>
+    Signed-off-by: Steve Dickson <steved@redhat.com>
+
+diff --git a/utils/nfsd/nfsd.c b/utils/nfsd/nfsd.c
+index 365e145d..c95d32f4 100644
+--- a/utils/nfsd/nfsd.c
++++ b/utils/nfsd/nfsd.c
+@@ -311,12 +311,16 @@ main(int argc, char **argv)
+ 				argv[0], count);
+ 			count = 1;
+ 		} else if (count == 0) {
+-			/*
+-			 * don't bother setting anything else if the threads
+-			 * are coming down anyway.
+-			 */
+-			socket_up = 1;
+-			goto set_threads;
++			if (nfssvc_inuse()) {
++				/*
++				 * don't bother setting anything else if the threads
++				 * are coming down anyway.
++				 */
++				socket_up = 1;
++				goto set_threads;
++			} else {
++				goto out;
++			}
+ 		}
+ 	}
+ 

diff --git a/nfs-utils.spec b/nfs-utils.spec
index 4451fd8..972e983 100644
--- a/nfs-utils.spec
+++ b/nfs-utils.spec
@@ -2,7 +2,7 @@ Summary: NFS utilities and supporting clients and daemons for the kernel NFS ser
 Name: nfs-utils
 URL: http://linux-nfs.org/
 Version: 2.8.7
-Release: 3%{?dist}
+Release: 4%{?dist}
 Epoch: 1
 
 # group all 32bit related archs
@@ -18,6 +18,7 @@ Patch001: nfs-utils-2.8.7-nfsdctl-no-listeners.patch
 Patch002: nfs-utils-2.9.1-nfs-iostat-display-MBs.patch
 Patch003: nfs-utils-2.8.7-libnfsidmap-empty-realms.patch
 Patch004: nfs-utils-2.8.7-getport-warning.patch
+Patch005: nfs-utils-2.8.7-nfsd-thread-count-zero.patch
 
 Patch100: nfs-utils-1.2.1-statdpath-man.patch
 Patch102: nfs-utils-1.2.5-idmap-errmsg.patch
@@ -452,6 +453,9 @@ rm -rf /etc/systemd/system/rpc-*.requires
 %{_mandir}/*/nfsiostat.8.gz
 
 %changelog
+* Tue Jun 16 2026 Steve Dickson <steved@redhat.com> 2.8.7-4
+- nfsd: don't assume service is running when setting thread count to 0
+
 * Sat May 30 2026 Steve Dickson <steved@redhat.com> 2.8.7-3
 - libnfsidmap: avoid malloc(0) for empty Local-Realms
 - Removed warnings in nfs_sockaddr2universal()