D58195.diff
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	Index: sys/compat/linuxkpi/common/src/linux_compat.c
	===================================================================
	--- sys/compat/linuxkpi/common/src/linux_compat.c
	+++ sys/compat/linuxkpi/common/src/linux_compat.c
	@@ -1399,6 +1399,19 @@
	error = ESTALE;
	vm_no_fault = 1;
	} else {
	+ if (ptr->vm_start == vmap->vm_start &&
	+ ptr->vm_end <= vmap->vm_end) {
	+ /*
	+ * Userspace wants to grow an existing
	+ * mapping. We already have a
	+ * `vm_object_t' for this mapping. We
	+ * just need to update the `struct
	+ * vm_area_struct` to have the correct
	+ * end address.
	+ */
	+ ptr->vm_end = vmap->vm_end;
	+ }
	+
	error = EEXIST;
	vm_no_fault = (ptr->vm_ops->fault == NULL);
	}