The gdbstub and kdb should get detached if the system is rebooting.
Calling gdbstub_exit() will set the proper debug core state and send a
message to any debugger that is connected to correctly detach.
An attached debugger will receive the exit code from
include/linux/reboot.h based on SYS_HALT, SYS_REBOOT, etc...
Reported-by: Jan Kiszka <jan.kis...@siemens.com>
Signed-off-by: Jason Wessel <jason.wes...@windriver.com>
---
kernel/debug/debug_core.c | 17 +++++++++++++++++
kernel/debug/gdbstub.c | 7 +++++++
2 files changed, 24 insertions(+), 0 deletions(-)
diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
index 0d7c087..3c1ad4e 100644
--- a/kernel/debug/debug_core.c
+++ b/kernel/debug/debug_core.c
@@ -41,6 +41,7 @@
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/sysrq.h>
+#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/kgdb.h>
#include <linux/kdb.h>
@@ -784,6 +785,20 @@ void __init dbg_late_init(void)
kdb_init(KDB_INIT_FULL);
}
+static int
+dbg_notify_reboot(struct notifier_block *this, unsigned long code, void *x)
+{
+ if (!dbg_kdb_mode)
+ gdbstub_exit(code);
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block dbg_reboot_notifier = {
+ .notifier_call = dbg_notify_reboot,
+ .next = NULL,
+ .priority = INT_MAX,
+};
+
static void kgdb_register_callbacks(void)
{
if (!kgdb_io_module_registered) {
@@ -791,6 +806,7 @@ static void kgdb_register_callbacks(void)
kgdb_arch_init();
if (!dbg_is_early)
kgdb_arch_late();
+ register_reboot_notifier(&dbg_reboot_notifier);
atomic_notifier_chain_register(&panic_notifier_list,
&kgdb_panic_event_nb);
#ifdef CONFIG_MAGIC_SYSRQ
@@ -812,6 +828,7 @@ static void kgdb_unregister_callbacks(void)
*/
if (kgdb_io_module_registered) {
kgdb_io_module_registered = 0;
+ unregister_reboot_notifier(&dbg_reboot_notifier);
atomic_notifier_chain_unregister(&panic_notifier_list,
&kgdb_panic_event_nb);
kgdb_arch_exit();
diff --git a/kernel/debug/gdbstub.c b/kernel/debug/gdbstub.c
index 5a15574..ce615e0 100644
--- a/kernel/debug/gdbstub.c
+++ b/kernel/debug/gdbstub.c
@@ -1111,6 +1111,13 @@ void gdbstub_exit(int status)
unsigned char checksum, ch, buffer[3];
int loop;
+ if (!kgdb_connected)
+ return;
+ kgdb_connected = 0;
+
+ if (!dbg_io_ops || dbg_kdb_mode)
+ return;
+
buffer[0] = 'W';
buffer[1] = hex_asc_hi(status);
buffer[2] = hex_asc_lo(status);
--
1.7.5.4
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