diff --git a/MAINTAINERS b/MAINTAINERS
index 8c3c798c256c..ea9bb4195aa1 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -54,7 +54,7 @@ contrib/pjdfstest	asomers,ngie,pjd,#test	Pre-commit review requested.
 etc/mail	gshapiro	Pre-commit review requested.  Keep in sync with -STABLE.
 etc/sendmail	gshapiro	Pre-commit review requested.  Keep in sync with -STABLE.
 fetch		des	Pre-commit review requested, email only.
-fusefs(5)	asomers	Pre-commit review requested.
+fusefs(4)	asomers	Pre-commit review requested.
 geli		pjd	Pre-commit review requested (both sys/geom/eli/ and sbin/geom/class/eli/).
 iwm(4)		adrian	Pre-commit review requested, send to freebsd-wireless@freebsd.org
 iwn(4)		adrian	Pre-commit review requested, send to freebsd-wireless@freebsd.org
@@ -121,7 +121,7 @@ libvmmapi	jhb	Pre-commit review requested via #bhyve
 			phabricator group.
 usr.sbin/bhyve*	jhb	Pre-commit review requested via #bhyve
 			phabricator group.
-autofs(5)	trasz	Pre-commit review recommended.
+autofs(4)	trasz	Pre-commit review recommended.
 iscsi(4)	trasz	Pre-commit review recommended.
 rctl(8)		trasz	Pre-commit review recommended.
 sys/dev/ofw	nwhitehorn	Pre-commit review recommended.
diff --git a/contrib/netbsd-tests/lib/libc/sys/t_revoke.c b/contrib/netbsd-tests/lib/libc/sys/t_revoke.c
index ec225b9be491..73cb9144f680 100644
--- a/contrib/netbsd-tests/lib/libc/sys/t_revoke.c
+++ b/contrib/netbsd-tests/lib/libc/sys/t_revoke.c
@@ -59,7 +59,7 @@ ATF_TC_BODY(revoke_basic, tc)
 	int *buf;
 
 #ifdef __FreeBSD__
-	atf_tc_skip("revoke(2) is only implemented for devfs(5).");
+	atf_tc_skip("revoke(2) is only implemented for devfs(4).");
 #endif
 	(void)memset(&res, 0, sizeof(struct rlimit));
 	(void)getrlimit(RLIMIT_NOFILE, &res);
@@ -117,7 +117,7 @@ ATF_TC_BODY(revoke_err, tc)
 	ATF_REQUIRE_ERRNO(ENAMETOOLONG, revoke(buf) == -1);
 
 #ifdef __FreeBSD__
-	atf_tc_skip("revoke(2) is only implemented for devfs(5).");
+	atf_tc_skip("revoke(2) is only implemented for devfs(4).");
 #endif
 	errno = 0;
 	ATF_REQUIRE_ERRNO(EPERM, revoke("/etc/passwd") == -1);
@@ -140,7 +140,7 @@ ATF_TC_BODY(revoke_perm, tc)
 	pid_t pid;
 
 #ifdef __FreeBSD__
-	atf_tc_skip("revoke(2) is only implemented for devfs(5).");
+	atf_tc_skip("revoke(2) is only implemented for devfs(4).");
 #endif
 	pw = getpwnam("nobody");
 	fd = open(path, O_RDWR | O_CREAT, 0600);
diff --git a/lib/libc/gen/getvfsbyname.c b/lib/libc/gen/getvfsbyname.c
index b782e5793334..18cbf64b9f4a 100644
--- a/lib/libc/gen/getvfsbyname.c
+++ b/lib/libc/gen/getvfsbyname.c
@@ -38,7 +38,7 @@
 #include <string.h>
 
 /*
- * fusefs(5) file systems may have a "subtype" which gets appended to
+ * fusefs(4) file systems may have a "subtype" which gets appended to
  * statfs(2)'s f_fstypename field on a per-mount basis.  Allow getvfsbyname to
  * match either the full "fusefs.foobar" or the more general "fusefs".
  */
diff --git a/libexec/rc/rc.initdiskless b/libexec/rc/rc.initdiskless
index a6820a546e55..a4c6c613b85a 100644
--- a/libexec/rc/rc.initdiskless
+++ b/libexec/rc/rc.initdiskless
@@ -204,7 +204,7 @@ handle_remount() { # $1 = mount point
 }
 
 # Create a generic memory disk.
-# The 'auto' parameter will attempt to use tmpfs(5), falls back to md(4).
+# The 'auto' parameter will attempt to use tmpfs(4), falls back to md(4).
 # $1 is size in 512-byte sectors, $2 is the mount point.
 mount_md() {
     if [ ${o_verbose} -gt 0 ] ; then
diff --git a/sbin/devd/autofs.conf b/sbin/devd/autofs.conf
index a06ca7295d38..2671687ecd83 100644
--- a/sbin/devd/autofs.conf
+++ b/sbin/devd/autofs.conf
@@ -1,5 +1,5 @@
 #
-# autofs(5) specific devd events
+# autofs(4) specific devd events
 
 # Discard autofs caches, useful for the -media special map.
 notify 100 {
diff --git a/sbin/devfs/devfs.rules b/sbin/devfs/devfs.rules
index f85940aaa7dd..c51672815e64 100644
--- a/sbin/devfs/devfs.rules
+++ b/sbin/devfs/devfs.rules
@@ -1,5 +1,5 @@
 #
-# The following are some default rules for devfs(5) mounts.
+# The following are some default rules for devfs(4) mounts.
 # The format is very simple. Empty lines and lines beginning
 # with a hash '#' are ignored. If the hash mark occurs anywhere
 # other than the beginning of a line, it and any subsequent
diff --git a/sys/README.md b/sys/README.md
index 10c9f183f7e1..c36686e979f5 100644
--- a/sys/README.md
+++ b/sys/README.md
@@ -55,6 +55,6 @@ Source Roadmap:
 | security | security facilities - `audit(4)` and `mac(4)` |
 | sys | kernel headers |
 | tests | kernel unit tests |
-| ufs | Unix File System - `ffs(7)` |
+| ufs | Unix File System - `ffs(4)` |
 | vm | virtual memory system |
 | x86 | code shared by AMD64 and i386 architectures |
diff --git a/sys/kern/imgact_binmisc.c b/sys/kern/imgact_binmisc.c
index aa037bb6046a..ed7a314ec475 100644
--- a/sys/kern/imgact_binmisc.c
+++ b/sys/kern/imgact_binmisc.c
@@ -656,7 +656,7 @@ imgact_binmisc_exec(struct image_params *imgp)
 		if (imgp->args->fname != NULL) {
 			fname = imgp->args->fname;
 		} else {
-			/* Use the fdescfs(5) path for fexecve(2). */
+			/* Use the fdescfs(4) path for fexecve(2). */
 			sname = sbuf_new_auto();
 			sbuf_printf(sname, "/dev/fd/%d", imgp->args->fd);
 			sbuf_finish(sname);
diff --git a/tests/sys/fs/fusefs/mknod.cc b/tests/sys/fs/fusefs/mknod.cc
index 1fb855f44f29..eb745f19acd5 100644
--- a/tests/sys/fs/fusefs/mknod.cc
+++ b/tests/sys/fs/fusefs/mknod.cc
@@ -283,7 +283,7 @@ TEST_F(Mknod, parent_inode)
 }
 
 /* 
- * fusefs(5) lacks VOP_WHITEOUT support.  No bugzilla entry, because that's a
+ * fusefs(4) lacks VOP_WHITEOUT support.  No bugzilla entry, because that's a
  * feature, not a bug
  */
 TEST_F(Mknod, DISABLED_whiteout)
diff --git a/tests/sys/fs/fusefs/open.cc b/tests/sys/fs/fusefs/open.cc
index 7ab3aeb6ba2a..ff736e6c3a94 100644
--- a/tests/sys/fs/fusefs/open.cc
+++ b/tests/sys/fs/fusefs/open.cc
@@ -79,7 +79,7 @@ class OpenNoOpenSupport: public FuseTest {
 };
 
 /* 
- * fusefs(5) does not support I/O on device nodes (neither does UFS).  But it
+ * fusefs(4) does not support I/O on device nodes (neither does UFS).  But it
  * shouldn't crash
  */
 TEST_F(Open, chr)
diff --git a/tests/sys/fs/fusefs/xattr.cc b/tests/sys/fs/fusefs/xattr.cc
index 7fa2a741e074..b1cbb9ffa768 100644
--- a/tests/sys/fs/fusefs/xattr.cc
+++ b/tests/sys/fs/fusefs/xattr.cc
@@ -350,7 +350,7 @@ TEST_F(Listxattr, enotsup)
  * On Linux, however, the file system is supposed to return ERANGE if an
  * insufficiently large buffer is passed to listxattr(2).
  *
- * fusefs(5) must guarantee the usual FreeBSD behavior.
+ * fusefs(4) must guarantee the usual FreeBSD behavior.
  */
 TEST_F(Listxattr, erange)
 {
diff --git a/tools/test/stress2/misc/devfs5.sh b/tools/test/stress2/misc/devfs5.sh
index ab96b37bfa2b..5a72d7db9efb 100755
--- a/tools/test/stress2/misc/devfs5.sh
+++ b/tools/test/stress2/misc/devfs5.sh
@@ -30,7 +30,7 @@
 [ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
 
 # Test scenario for https://reviews.freebsd.org/D20411
-# Add devfs(5) support for VOP_MKDIR(9) and VOP_RMDIR(9)
+# Add devfs(4) support for VOP_MKDIR(9) and VOP_RMDIR(9)
 
 . ../default.cfg
 
diff --git a/tools/test/stress2/misc/ext2fs3.sh b/tools/test/stress2/misc/ext2fs3.sh
index f33b4cc73547..fd129a235102 100755
--- a/tools/test/stress2/misc/ext2fs3.sh
+++ b/tools/test/stress2/misc/ext2fs3.sh
@@ -26,7 +26,7 @@
 # SUCH DAMAGE.
 #
 
-# ext2fs(5) test scenario with a 1k block size
+# ext2fs(4) test scenario with a 1k block size
 # "panic: ext2_reallocblks: alloc mismatch" seen.
 # "Fatal trap 12: page fault while in kernel mode" seen.
 
diff --git a/tools/test/stress2/misc/fifo4.sh b/tools/test/stress2/misc/fifo4.sh
index 2a8a149e3105..1578b8786d43 100755
--- a/tools/test/stress2/misc/fifo4.sh
+++ b/tools/test/stress2/misc/fifo4.sh
@@ -27,7 +27,7 @@
 # SUCH DAMAGE.
 #
 
-# tmpfs(5) version of fifo2.sh
+# tmpfs(4) version of fifo2.sh
 # No problems seen on HEAD.
 
 [ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
diff --git a/tools/test/stress2/misc/mkfifo5.sh b/tools/test/stress2/misc/mkfifo5.sh
index c0355cef2db0..96d30e5fe024 100755
--- a/tools/test/stress2/misc/mkfifo5.sh
+++ b/tools/test/stress2/misc/mkfifo5.sh
@@ -26,7 +26,7 @@
 # SUCH DAMAGE.
 #
 
-# mkfifo(2), select(2) with tmpfs(5) scenario.
+# mkfifo(2), select(2) with tmpfs(4) scenario.
 
 . ../default.cfg
 [ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
diff --git a/tools/test/stress2/misc/mkfifo6.sh b/tools/test/stress2/misc/mkfifo6.sh
index 5647bf9493d6..13a62b5e0286 100755
--- a/tools/test/stress2/misc/mkfifo6.sh
+++ b/tools/test/stress2/misc/mkfifo6.sh
@@ -26,7 +26,7 @@
 # SUCH DAMAGE.
 #
 
-# mkfifo(2), select(2) with tmpfs(5) scenario.
+# mkfifo(2), select(2) with tmpfs(4) scenario.
 
 . ../default.cfg
 [ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
diff --git a/tools/test/stress2/misc/mkfifo7.sh b/tools/test/stress2/misc/mkfifo7.sh
index b17e84536bed..c1af3374526e 100755
--- a/tools/test/stress2/misc/mkfifo7.sh
+++ b/tools/test/stress2/misc/mkfifo7.sh
@@ -26,7 +26,7 @@
 # SUCH DAMAGE.
 #
 
-# mkfifo(2), poll(2) with tmpfs(5) scenario.
+# mkfifo(2), poll(2) with tmpfs(4) scenario.
 
 . ../default.cfg
 [ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
diff --git a/tools/test/stress2/misc/mlockall4.sh b/tools/test/stress2/misc/mlockall4.sh
index 778256fa8976..66ae05fa4ae1 100755
--- a/tools/test/stress2/misc/mlockall4.sh
+++ b/tools/test/stress2/misc/mlockall4.sh
@@ -26,7 +26,7 @@
 # SUCH DAMAGE.
 #
 
-# mlockall(2) / nullfs(5) scenario causes:
+# mlockall(2) / nullfs(4) scenario causes:
 # http://people.freebsd.org/~pho/stress/log/kostik619.txt
 # kern/182661, fixed in r256211.
 
diff --git a/tools/test/stress2/misc/msdos14.sh b/tools/test/stress2/misc/msdos14.sh
index 9c7a636f5f59..aaa95144c14e 100755
--- a/tools/test/stress2/misc/msdos14.sh
+++ b/tools/test/stress2/misc/msdos14.sh
@@ -27,7 +27,7 @@
 # SUCH DAMAGE.
 #
 
-# Rename(2) test with msdosfs(5)
+# Rename(2) test with msdosfs(4)
 # Test scenario by kib@
 
 . ../default.cfg
diff --git a/tools/test/stress2/misc/nullfs18.sh b/tools/test/stress2/misc/nullfs18.sh
index 0ee0a1c2ef6b..b4414cbc3e3e 100755
--- a/tools/test/stress2/misc/nullfs18.sh
+++ b/tools/test/stress2/misc/nullfs18.sh
@@ -28,7 +28,7 @@
 
 [ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
 
-# Demonstate nullfs(5) inode leak.
+# Demonstate nullfs(4) inode leak.
 # Fixed by r295717.
 
 . ../default.cfg
diff --git a/tools/test/stress2/misc/pread.sh b/tools/test/stress2/misc/pread.sh
index 1bf3b874e6af..24ee2efb696a 100755
--- a/tools/test/stress2/misc/pread.sh
+++ b/tools/test/stress2/misc/pread.sh
@@ -46,13 +46,13 @@ mdconfig -l | grep -q md$mdstart &&  mdconfig -d -u $mdstart
 
 mount -t tmpfs tmpfs $mntpoint
 cp -a /usr/include $mntpoint
-echo "Testing tmpfs(5)"
+echo "Testing tmpfs(4)"
 /tmp/pread $mntpoint
 while mount | grep -q "on $mntpoint "; do
 	umount $mntpoint || sleep 1
 done
 
-echo "Testing fdescfs(5)"
+echo "Testing fdescfs(4)"
 mount -t fdescfs null /dev/fd
 for i in `jot 100`; do
 	/tmp/pread /dev/fd
@@ -62,7 +62,7 @@ while mount | grep -q "on /dev/fd "; do
 	umount /dev/fd || sleep 1
 done
 
-echo "Testing procfs(5)"
+echo "Testing procfs(4)"
 mount -t procfs procfs $mntpoint
 /tmp/pread $mntpoint
 while mount | grep -q "on $mntpoint "; do
@@ -81,13 +81,13 @@ done
 mdconfig -d -u $mdstart
 
 mount -t nullfs /bin $mntpoint
-echo "Testing nullfs(5)"
+echo "Testing nullfs(4)"
 /tmp/pread $mntpoint
 while mount | grep -q "on $mntpoint "; do
 	umount $mntpoint || sleep 1
 done
 
-echo "Testing procfs(5)"
+echo "Testing procfs(4)"
 mount -t procfs procfs $mntpoint
 /tmp/pread $mntpoint
 while mount | grep -q "on $mntpoint "; do
diff --git a/tools/test/stress2/misc/procfs3.sh b/tools/test/stress2/misc/procfs3.sh
index c9c4820adbff..30bcc8b3cd62 100755
--- a/tools/test/stress2/misc/procfs3.sh
+++ b/tools/test/stress2/misc/procfs3.sh
@@ -26,7 +26,7 @@
 # SUCH DAMAGE.
 #
 
-# procfs(5) test scenario.
+# procfs(4) test scenario.
 # "panic: wchan 0xc10a4f68 has no wmesg" seen
 
 [ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
diff --git a/tools/test/stress2/misc/readdir.sh b/tools/test/stress2/misc/readdir.sh
index 8616a8a40206..425295631181 100755
--- a/tools/test/stress2/misc/readdir.sh
+++ b/tools/test/stress2/misc/readdir.sh
@@ -45,19 +45,19 @@ mount | grep $mntpoint | grep -q /dev/md && umount -f $mntpoint
 mdconfig -l | grep -q md$mdstart &&  mdconfig -d -u $mdstart
 
 mount -t tmpfs tmpfs $mntpoint
-echo "Testing tmpfs(5)"
+echo "Testing tmpfs(4)"
 cp -a /usr/include $mntpoint
 /tmp/readdir $mntpoint
 umount $mntpoint
 
-echo "Testing fdescfs(5)"
+echo "Testing fdescfs(4)"
 kldstat -v | grep -q fdescfs || { kldload fdescfs.ko; loaded=1; }
 mount -t fdescfs null /dev/fd
 /tmp/readdir /dev/fd
 umount /dev/fd
 [ $unload ] && kldunload fdescfs.ko
 
-echo "Testing procfs(5)"
+echo "Testing procfs(4)"
 mount -t procfs procfs $mntpoint
 /tmp/readdir $mntpoint
 umount $mntpoint
@@ -89,7 +89,7 @@ umount $mntpoint
 mdconfig -d -u $mdstart
 
 mount -t nullfs /bin $mntpoint
-echo "Testing nullfs(5)"
+echo "Testing nullfs(4)"
 /tmp/readdir $mntpoint
 umount $mntpoint
 
diff --git a/tools/test/stress2/misc/sendfile5.sh b/tools/test/stress2/misc/sendfile5.sh
index c81515003a13..933e4f94a73c 100755
--- a/tools/test/stress2/misc/sendfile5.sh
+++ b/tools/test/stress2/misc/sendfile5.sh
@@ -52,7 +52,7 @@ mdconfig -l | grep -q md$mdstart &&  mdconfig -d -u $mdstart
 
 kldstat | grep -q tmpfs.ko || loaded=1
 mount -t tmpfs tmpfs $mntpoint
-echo "Testing tmpfs(5)"
+echo "Testing tmpfs(4)"
 cp $diskimage $mntpoint
 /tmp/sendfile5 $mntpoint/$file
 umount $mntpoint
@@ -68,7 +68,7 @@ umount $mntpoint
 mdconfig -d -u $mdstart
 
 mount -t nullfs $dir $mntpoint
-echo "Testing nullfs(5)"
+echo "Testing nullfs(4)"
 /tmp/sendfile5 $mntpoint/$file
 umount $mntpoint
 
diff --git a/tools/test/stress2/misc/tmpfs10.sh b/tools/test/stress2/misc/tmpfs10.sh
index 870530c57ea7..6388f59959a4 100755
--- a/tools/test/stress2/misc/tmpfs10.sh
+++ b/tools/test/stress2/misc/tmpfs10.sh
@@ -26,7 +26,7 @@
 # SUCH DAMAGE.
 #
 
-# tmpfs(5) name lookup problem seen:
+# tmpfs(4) name lookup problem seen:
 
 # $ ./tmpfs10.sh
 # tmpfs10: unlink(p01193.14729) at loop #2: No such file or directory
diff --git a/tools/test/stress2/misc/tmpfs11.sh b/tools/test/stress2/misc/tmpfs11.sh
index efb535b8ea94..629ca8ae3d31 100755
--- a/tools/test/stress2/misc/tmpfs11.sh
+++ b/tools/test/stress2/misc/tmpfs11.sh
@@ -28,7 +28,7 @@
 
 [ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
 
-# Test with two tmpfs(5) file systems mounted.
+# Test with two tmpfs(4) file systems mounted.
 
 . ../default.cfg
 
diff --git a/tools/test/stress2/misc/tmpfs17.sh b/tools/test/stress2/misc/tmpfs17.sh
index 878fcf6c95d1..d5f6c50d2e48 100755
--- a/tools/test/stress2/misc/tmpfs17.sh
+++ b/tools/test/stress2/misc/tmpfs17.sh
@@ -26,7 +26,7 @@
 # SUCH DAMAGE.
 #
 
-# tmpfs(5) option nonc test scenario
+# tmpfs(4) option nonc test scenario
 
 . ../default.cfg
 [ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
diff --git a/tools/test/stress2/misc/tmpfs8.sh b/tools/test/stress2/misc/tmpfs8.sh
index b17a329f69e7..b78f0e74562b 100755
--- a/tools/test/stress2/misc/tmpfs8.sh
+++ b/tools/test/stress2/misc/tmpfs8.sh
@@ -28,7 +28,7 @@
 
 [ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
 
-# Demonstrate rename(2) cache problem for tmpfs(5). Fixed in r226987.
+# Demonstrate rename(2) cache problem for tmpfs(4). Fixed in r226987.
 # Variation of rename6.sh
 
 . ../default.cfg
diff --git a/tools/test/stress2/misc/unionfs17.sh b/tools/test/stress2/misc/unionfs17.sh
index bcb6d242187b..9ddbd1cab8cb 100755
--- a/tools/test/stress2/misc/unionfs17.sh
+++ b/tools/test/stress2/misc/unionfs17.sh
@@ -6,7 +6,7 @@
 # SPDX-License-Identifier: BSD-2-Clause
 #
 
-# unionfs(8) test
+# unionfs(4) test
 # Variation of unionfs7.sh, but with tmpfs
 
 # "mkdir: rmdir(d17) Directory not empty" seen.
diff --git a/tools/test/stress2/misc/unionfs18.sh b/tools/test/stress2/misc/unionfs18.sh
index e772a67a07fb..a7840db263e1 100755
--- a/tools/test/stress2/misc/unionfs18.sh
+++ b/tools/test/stress2/misc/unionfs18.sh
@@ -6,7 +6,7 @@
 # SPDX-License-Identifier: BSD-2-Clause
 #
 
-# Simple unionfs(8) + tmpfs test
+# Simple unionfs(4) + tmpfs(4) test
 
 # "rmdir: d2: Directory not empty" seen.
 
diff --git a/tools/test/stress2/misc/unionfs6.sh b/tools/test/stress2/misc/unionfs6.sh
index 54e688b0a111..cae1995a2e0d 100755
--- a/tools/test/stress2/misc/unionfs6.sh
+++ b/tools/test/stress2/misc/unionfs6.sh
@@ -27,7 +27,7 @@
 # SUCH DAMAGE.
 #
 
-# unionfs(8) test
+# unionfs(4) test
 # "panic: ufs dir vp 0xfffffe0157351068 ip 0xfffffe016a63d488 flags 0x3c06" seen
 
 [ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
diff --git a/tools/test/stress2/misc/unionfs7.sh b/tools/test/stress2/misc/unionfs7.sh
index 1684a960d142..6adcd01a5f83 100755
--- a/tools/test/stress2/misc/unionfs7.sh
+++ b/tools/test/stress2/misc/unionfs7.sh
@@ -27,7 +27,7 @@
 # SUCH DAMAGE.
 #
 
-# unionfs(8) test
+# unionfs(4) test
 
 # "unionfs_get_node_status: 0xfffffe018f356770 is not exclusive locked but
 # should be" seen.
diff --git a/tools/test/stress2/misc/unionfs8.sh b/tools/test/stress2/misc/unionfs8.sh
index 9ddf5a990b82..fdc37b16ff03 100755
--- a/tools/test/stress2/misc/unionfs8.sh
+++ b/tools/test/stress2/misc/unionfs8.sh
@@ -27,7 +27,7 @@
 # SUCH DAMAGE.
 #
 
-# unionfs(8) test with a cd9660 file system
+# unionfs(4) test with a cd9660(4) file system
 
 # "panic: unionfs_noderem: vnode 0xfffffe014f9259c8 locked recursively" seen
 # https://people.freebsd.org/~pho/stress/log/log0233.txt