From eb6167ae639c34ae02e2305a6b6706c463310e47 Mon Sep 17 00:00:00 2001
From: hasslesstech <hasslesstech@tutanota.com>
Date: Tue, 17 Dec 2024 20:56:26 +0200
Subject: [PATCH] add uncaught bug for debugging in the wild

---
 Makefile |  6 +++++-
 hello1.c | 11 +++++++++--
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index 14cbe97..413e385 100644
--- a/Makefile
+++ b/Makefile
@@ -2,13 +2,17 @@
 ifneq ($(KERNELRELEASE),)
 # kbuild part of makefile
 obj-m   := hello1.o hello2.o
-ccflags-y := -I$(obj)/inc
+ccflags-y := -I$(obj)/inc -g
 else
 # normal makefile
 KDIR ?= /lib/modules/`uname -r`/build
 
 default:
 	$(MAKE) -C $(KDIR) M=$$PWD
+	cp hello1.ko hello1.ko.unstripped
+	$(CROSS_COMPILE)strip -g hello1.ko
+
 clean:
 	$(MAKE) -C $(KDIR) M=$$PWD clean
+
 endif
diff --git a/hello1.c b/hello1.c
index 8d2487f..9008558 100644
--- a/hello1.c
+++ b/hello1.c
@@ -45,6 +45,7 @@ struct TimingList {
 };
 
 static struct TimingList *tl_head;
+static unsigned int bug_generator;
 
 static struct TimingList *write_first_node(void)
 {
@@ -59,8 +60,12 @@ static struct TimingList *insert_next_node(struct TimingList *tail)
 	struct TimingList *new_tl_node = kmalloc(sizeof(struct TimingList),
 						GFP_KERNEL);
 
-	tail->next = new_tl_node;
-	new_tl_node->next = NULL;
+	if (bug_generator == 2) {
+		new_tl_node = NULL;
+	} else {
+		tail->next = new_tl_node;
+		new_tl_node->next = NULL;
+	}
 
 	return new_tl_node;
 }
@@ -106,6 +111,8 @@ void print_hello(int msg_count)
 	struct TimingList *current_tail = tl_head;
 
 	for (i = 0; i < msg_count; i++) {
+		bug_generator = i;
+
 		current_tail = add_new_node(current_tail);
 
 		current_tail->t_before = ktime_get();