Module Name: src
Committed By: riastradh
Date: Tue Aug 16 10:24:17 UTC 2022
Modified Files:
src/sys/kern: kern_crashme.c
Log Message:
crashme(9): New kernel_lock_spinout crasher.
This assumes that something will eventually try to take the kernel
lock and, after spinning for a while, spin out and crash -- so for
now it's only enabled under LOCKDEBUG, without which the kernel lock
spins forever.
To generate a diff of this commit:
cvs rdiff -u -r1.5 -r1.6 src/sys/kern/kern_crashme.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/kern/kern_crashme.c
diff -u src/sys/kern/kern_crashme.c:1.5 src/sys/kern/kern_crashme.c:1.6
--- src/sys/kern/kern_crashme.c:1.5 Sat Nov 27 14:11:14 2021
+++ src/sys/kern/kern_crashme.c Tue Aug 16 10:24:17 2022
@@ -1,4 +1,4 @@
-/* $NetBSD: kern_crashme.c,v 1.5 2021/11/27 14:11:14 riastradh Exp $ */
+/* $NetBSD: kern_crashme.c,v 1.6 2022/08/16 10:24:17 riastradh Exp $ */
/*
* Copyright (c) 2018, 2019 Matthew R. Green
@@ -63,6 +63,9 @@ static int crashme_null_jump(int);
#ifdef DDB
static int crashme_ddb(int);
#endif
+#ifdef LOCKDEBUG
+static int crashme_kernel_lock_spinout(int);
+#endif
#define CMNODE(name, lname, func) \
{ \
@@ -78,6 +81,10 @@ static crashme_node nodes[] = {
#ifdef DDB
CMNODE("ddb", "enter ddb directly", crashme_ddb),
#endif
+#ifdef LOCKDEBUG
+ CMNODE("kernel_lock_spinout", "infinite kernel lock",
+ crashme_kernel_lock_spinout),
+#endif
};
static crashme_node *first_node;
static kmutex_t crashme_lock;
@@ -270,3 +277,16 @@ crashme_ddb(int flags)
return 0;
}
#endif
+
+#ifdef LOCKDEBUG
+static int
+crashme_kernel_lock_spinout(int flags)
+{
+
+ KERNEL_LOCK(1, NULL);
+ for (;;)
+ __insn_barrier();
+ KERNEL_UNLOCK_ONE(NULL);
+ return 0;
+}
+#endif
