D53219.diff
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	diff --git a/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_vnops_os.c b/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_vnops_os.c
	--- a/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_vnops_os.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_vnops_os.c
	@@ -4223,8 +4223,20 @@

	zfs_vmobject_wlock(object);
	(void) vm_page_grab_pages(object, OFF_TO_IDX(start),
	- VM_ALLOC_NORMAL \| VM_ALLOC_WAITOK \| VM_ALLOC_ZERO,
	+ VM_ALLOC_NORMAL \| VM_ALLOC_WAITOK,
	ma, count);
	+ if (!vm_page_all_valid(ma[count - 1])) {
	+ /*
	+ * Later in this function, we copy DMU data to
	+ * invalid pages only. The last page may not be
	+ * entirely filled though, if the file does not
	+ * end on a page boundary. Therefore, we zero
	+ * that last page here to make sure it does not
	+ * contain garbage after the end of file.
	+ */
	+ ASSERT(vm_page_none_valid(ma[count - 1]));
	+ vm_page_zero_invalid(ma[count - 1], FALSE);
	+ }
	zfs_vmobject_wunlock(object);
	}
	if (blksz == zp->z_blksz)