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-rw-r--r--arch/um/kernel/reboot.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/um/kernel/reboot.c b/arch/um/kernel/reboot.c
index 66d754c46e7b..1411f4e79f9a 100644
--- a/arch/um/kernel/reboot.c
+++ b/arch/um/kernel/reboot.c
@@ -25,10 +25,13 @@ static void kill_off_processes(void)
read_lock(&tasklist_lock);
for_each_process(p) {
- if (p->mm == NULL)
+ task_lock(p);
+ if (!p->mm) {
+ task_unlock(p);
continue;
-
+ }
pid = p->mm->context.id.u.pid;
+ task_unlock(p);
os_kill_ptraced_process(pid, 1);
}
read_unlock(&tasklist_lock);