Module Name: src
Committed By: riastradh
Date: Fri Jul 7 12:34:26 UTC 2023
Modified Files:
src/sys/kern: kern_crashme.c
Log Message:
crashme(9): New crash methods with raised ipl or kpreempt disabled.
To generate a diff of this commit:
cvs rdiff -u -r1.10 -r1.11 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:1.10 src/sys/kern/kern_crashme.c:1.11
--- src/sys/kern/kern_crashme.c:1.10 Thu Sep 22 14:39:24 2022
+++ src/sys/kern/kern_crashme.c Fri Jul 7 12:34:26 2023
@@ -1,4 +1,4 @@
-/* $NetBSD: kern_crashme.c,v 1.10 2022/09/22 14:39:24 riastradh Exp $ */
+/* $NetBSD: kern_crashme.c,v 1.11 2023/07/07 12:34:26 riastradh Exp $ */
/*
* Copyright (c) 2018, 2019 Matthew R. Green
@@ -47,6 +47,7 @@
#include <sys/kmem.h>
#include <sys/mutex.h>
#include <sys/crashme.h>
+#include <sys/intr.h>
#ifdef DDB
#include <ddb/ddb.h>
@@ -67,6 +68,8 @@ static int crashme_ddb(int);
static int crashme_kernel_lock_spinout(int);
#endif
static int crashme_mutex_recursion(int);
+static int crashme_spl_spinout(int);
+static int crashme_kpreempt_spinout(int);
#define CMNODE(name, lname, func) \
{ \
@@ -88,6 +91,10 @@ static crashme_node nodes[] = {
#endif
CMNODE("mutex_recursion", "enter the same mutex twice",
crashme_mutex_recursion),
+ CMNODE("spl_spinout", "infinite loop at raised spl",
+ crashme_spl_spinout),
+ CMNODE("kpreempt_spinout", "infinite loop with kpreempt disabled",
+ crashme_kpreempt_spinout),
};
static crashme_node *first_node;
static kmutex_t crashme_lock;
@@ -332,3 +339,35 @@ crashme_mutex_recursion(int flags)
return -1;
}
}
+
+static int
+crashme_spl_spinout(int flags)
+{
+ int s;
+
+ printf("%s: raising ipl to %d\n", __func__, flags);
+ s = splraiseipl(makeiplcookie(flags));
+ printf("%s: raised ipl to %d, s=%d\n", __func__, flags, s);
+ for (;;)
+ __insn_barrier();
+ printf("%s: exited infinite loop!?\n", __func__);
+ splx(s);
+ printf("%s: lowered ipl to s=%d\n", __func__, s);
+
+ return 0;
+}
+
+static int
+crashme_kpreempt_spinout(int flags)
+{
+
+ kpreempt_disable();
+ printf("%s: disabled kpreemption\n", __func__);
+ for (;;)
+ __insn_barrier();
+ printf("%s: exited infinite loop!?\n", __func__);
+ kpreempt_enable();
+ printf("%s: re-enabled kpreemption\n", __func__);
+
+ return 0;
+}
