fix .sh typo on kernel module test that accept the module as first argument

README.adoc

@@ -364,15 +364,15 @@ The safe way is to fist <<rebuild-buildroot-while-running,quit QEMU>>, rebuild t
 ./run --eval-after 'insmod hello.ko'
 ....
 
-or for a slightly faster turnaround just leave it on 9p and use it from there:
+where `./build-buildroot` is required after `./build-modules` because it re-generates the root filesystem with the modules that we compiled at `./build-modules`.
+
+Alternatively, for a slightly faster turnaround just leave it on 9p and use it from there:
 
 ....
 ./build-modules
 ./run --eval-after 'insmod /mnt/9p/out_rootfs_overlay/lkmc/hello.ko'
 ....
 
-`./build-buildroot` is required after `./build-modules` because it re-generates the root filesystem with the modules that we compiled at `./build-modules`.
-
 You can see that `./build` does that as well, by running:
 
 ....
@@ -7733,6 +7733,14 @@ This example behaves the same as <<fops>>, except that the in-memory virtual fil
 * link:kernel_modules/memfile.c[]
 * link:rootfs_overlay/lkmc/memfile.sh[]
 
+TODO: this example builds but oopses with out of memory on our currently default kernel v5.9.2 when doing the big allocation at:
+
+....
+dd if=/dev/zero of="$f" bs=1k count=1M
+....
+
+It works however on kernel 6.8.12, we're not sure why. We do have a potential krealloc vs kvrealloc on version check which is a very likely reason for the issue, but it has not been investigated.
+
 [[seq-file]]
 ==== seq_file
 

kernel_modules/memfile.c

@@ -1,4 +1,4 @@
-/* https://cirosantilli.com/linux-kernel-module-cheat#fops */
+/* https://cirosantilli.com/linux-kernel-module-cheat#memfile */
 
 #include <linux/debugfs.h>
 #include <linux/errno.h> /* EFAULT */

rootfs_overlay/lkmc/memfile.sh

@@ -1,5 +1,5 @@
 #!/bin/sh
-set -e
+set -eux
 
 # Helpers
 odraw() (