Author: kib
Date: Sat Jan 20 12:31:21 2018
New Revision: 328193
URL: https://svnweb.freebsd.org/changeset/base/328193
Log:
MFC r327917:
Add sysctl debug.kdb.stack_overflow.
Modified:
stable/11/sys/kern/subr_kdb.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/sys/kern/subr_kdb.c
==============================================================================
--- stable/11/sys/kern/subr_kdb.c Sat Jan 20 12:19:02 2018
(r328192)
+++ stable/11/sys/kern/subr_kdb.c Sat Jan 20 12:31:21 2018
(r328193)
@@ -82,6 +82,7 @@ static int kdb_sysctl_enter(SYSCTL_HANDLER_ARGS);
static int kdb_sysctl_panic(SYSCTL_HANDLER_ARGS);
static int kdb_sysctl_trap(SYSCTL_HANDLER_ARGS);
static int kdb_sysctl_trap_code(SYSCTL_HANDLER_ARGS);
+static int kdb_sysctl_stack_overflow(SYSCTL_HANDLER_ARGS);
static SYSCTL_NODE(_debug, OID_AUTO, kdb, CTLFLAG_RW, NULL, "KDB nodes");
@@ -107,6 +108,10 @@ SYSCTL_PROC(_debug_kdb, OID_AUTO, trap_code,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, NULL, 0,
kdb_sysctl_trap_code, "I", "set to cause a page fault via code access");
+SYSCTL_PROC(_debug_kdb, OID_AUTO, stack_overflow,
+ CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, NULL, 0,
+ kdb_sysctl_stack_overflow, "I", "set to cause a stack overflow");
+
SYSCTL_INT(_debug_kdb, OID_AUTO, break_to_debugger,
CTLFLAG_RWTUN | CTLFLAG_SECURE,
&kdb_break_to_debugger, 0, "Enable break to debugger");
@@ -221,6 +226,36 @@ kdb_sysctl_trap_code(SYSCTL_HANDLER_ARGS)
(*fp)(0x11111111, 0x22222222, 0x33333333);
return (0);
}
+
+static void kdb_stack_overflow(volatile int *x) __noinline;
+static void
+kdb_stack_overflow(volatile int *x)
+{
+
+ if (*x > 10000000)
+ return;
+ kdb_stack_overflow(x);
+ *x += PCPU_GET(cpuid) / 1000000;
+}
+
+static int
+kdb_sysctl_stack_overflow(SYSCTL_HANDLER_ARGS)
+{
+ int error, i;
+ volatile int x;
+
+ error = sysctl_wire_old_buffer(req, sizeof(int));
+ if (error == 0) {
+ i = 0;
+ error = sysctl_handle_int(oidp, &i, 0, req);
+ }
+ if (error != 0 || req->newptr == NULL)
+ return (error);
+ x = 0;
+ kdb_stack_overflow(&x);
+ return (0);
+}
+
void
kdb_panic(const char *msg)
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