diff --git a/arch/um/kernel/sysrq.c b/arch/um/kernel/sysrq.c
index 4bb8622dc512..e3b6a2fd75d9 100644
--- a/arch/um/kernel/sysrq.c
+++ b/arch/um/kernel/sysrq.c
@@ -52,5 +52,5 @@ void show_stack(struct task_struct *task, unsigned long *stack,
 	}
 
 	printk("%sCall Trace:\n", loglvl);
-	dump_trace(current, &stackops, (void *)loglvl);
+	dump_trace(task ?: current, &stackops, (void *)loglvl);
 }