Print who and on which CPU the kernel panics

ostd/src/task/mod.rs

@@ -26,6 +26,7 @@ use crate::{prelude::*, user::UserSpace};
 /// Each task is associated with per-task data and an optional user space.
 /// If having a user space, the task can switch to the user space to
 /// execute user code. Multiple tasks can share a single user space.
+#[derive(Debug)]
 pub struct Task {
     func: SyncUnsafeCell<Option<Box<dyn FnOnce() + Send + Sync>>>,
     data: Box<dyn Any + Send + Sync>,

ostd/src/task/scheduler/info.rs

@@ -14,12 +14,14 @@ use crate::{cpu::CpuId, task::Task};
 /// define them, such as
 /// [existential types](https://github.com/rust-lang/rfcs/pull/2492) do not
 /// exist yet. So we decide to define them in OSTD.
+#[derive(Debug)]
 pub struct TaskScheduleInfo {
     /// The CPU that the task would like to be running on.
     pub cpu: AtomicCpuId,
 }
 
 /// An atomic CPUID container.
+#[derive(Debug)]
 pub struct AtomicCpuId(AtomicU32);
 
 impl AtomicCpuId {