@@ -4,6 +4,7 @@
 
 #include <linux/sched.h>
 #include <linux/ftrace.h>
+#include <linux/kprobes.h>
 #include <asm/ptrace.h>
 #include <asm/stacktrace.h>
 

@@ -15,6 +16,7 @@ struct unwind_state {
 	unsigned long stack_mask;
 	struct task_struct *task;
 	int graph_idx;
+	struct llist_node *kr_cur;
 	bool error;
 #if defined(CONFIG_UNWINDER_ORC)
 	bool signal, full_regs;

@@ -99,6 +101,27 @@ void unwind_module_init(struct module *mod, void *orc_ip, size_t orc_ip_size,
 			void *orc, size_t orc_size) {}
 #endif
 
+static inline
+unsigned long unwind_recover_kretprobe(struct unwind_state *state,
+				       unsigned long addr, unsigned long *addr_p)
+{
+	return is_kretprobe_trampoline(addr) ?
+		kretprobe_find_ret_addr(state->task, addr_p, &state->kr_cur) :
+		addr;
+}
+
+/* Recover the return address modified by instrumentation (e.g. kretprobe) */
+static inline
+unsigned long unwind_recover_ret_addr(struct unwind_state *state,
+				     unsigned long addr, unsigned long *addr_p)
+{
+	unsigned long ret;
+
+	ret = ftrace_graph_ret_addr(state->task, &state->graph_idx,
+				    addr, addr_p);
+	return unwind_recover_kretprobe(state, ret, addr_p);
+}
+
 /*
  * This disables KASAN checking when reading a value from another task's stack,
  * since the other task could be running on another CPU and could have poisoned

@@ -3,6 +3,7 @@
 #include <linux/sched/task.h>
 #include <linux/sched/task_stack.h>
 #include <linux/interrupt.h>
+#include <linux/kprobes.h>
 #include <asm/sections.h>
 #include <asm/ptrace.h>
 #include <asm/bitops.h>

@@ -240,8 +241,7 @@ static bool update_stack_state(struct unwind_state *state,
 	else {
 		addr_p = unwind_get_return_address_ptr(state);
 		addr = READ_ONCE_TASK_STACK(state->task, *addr_p);
-		state->ip = ftrace_graph_ret_addr(state->task, &state->graph_idx,
-						  addr, addr_p);
+		state->ip = unwind_recover_ret_addr(state, addr, addr_p);
 	}
 
 	/* Save the original stack pointer for unwind_dump(): */

@@ -15,8 +15,7 @@ unsigned long unwind_get_return_address(struct unwind_state *state)
 
 	addr = READ_ONCE_NOCHECK(*state->sp);
 
-	return ftrace_graph_ret_addr(state->task, &state->graph_idx,
-				     addr, state->sp);
+	return unwind_recover_ret_addr(state, addr, state->sp);
 }
 EXPORT_SYMBOL_GPL(unwind_get_return_address);
 

@@ -2,6 +2,7 @@
 #include <linux/objtool.h>
 #include <linux/module.h>
 #include <linux/sort.h>
+#include <linux/kprobes.h>
 #include <asm/ptrace.h>
 #include <asm/stacktrace.h>
 #include <asm/unwind.h>

@@ -534,9 +535,8 @@ bool unwind_next_frame(struct unwind_state *state)
 		if (!deref_stack_reg(state, ip_p, &state->ip))
 			goto err;
 
-		state->ip = ftrace_graph_ret_addr(state->task, &state->graph_idx,
-						  state->ip, (void *)ip_p);
-
+		state->ip = unwind_recover_ret_addr(state, state->ip,
+						    (unsigned long *)ip_p);
 		state->sp = sp;
 		state->regs = NULL;
 		state->prev_regs = NULL;

@@ -549,7 +549,15 @@ bool unwind_next_frame(struct unwind_state *state)
 					 (void *)orig_ip);
 			goto err;
 		}
-
+		/*
+		 * There is a small chance to interrupt at the entry of
+		 * kretprobe_trampoline where the ORC info doesn't exist.
+		 * That point is right after the RET to kretprobe_trampoline
+		 * which was modified return address. So the @addr_p must
+		 * be right before the regs->sp.
+		 */
+		state->ip = unwind_recover_kretprobe(state, state->ip,
+				(unsigned long *)(state->sp - sizeof(long)));
 		state->regs = (struct pt_regs *)sp;
 		state->prev_regs = NULL;
 		state->full_regs = true;

@@ -562,6 +570,9 @@ bool unwind_next_frame(struct unwind_state *state)
 					 (void *)orig_ip);
 			goto err;
 		}
+		/* See UNWIND_HINT_TYPE_REGS case comment. */
+		state->ip = unwind_recover_kretprobe(state, state->ip,
+				(unsigned long *)(state->sp - sizeof(long)));
 
 		if (state->full_regs)
 			state->prev_regs = state->regs;