[dev.boringcrypto.go1.17] all: merge go1.17.13 into dev.boringcrypto.go1.17dev.boringcrypto.go1.17

Change-Id: Iaf4f2cb506aab9e22a5df5b937c38fc108f1e1c1

1 files changed, 13 insertions, 2 deletions

diff --git a/src/runtime/traceback.go b/src/runtime/traceback.go
index 814c3236345..de593491a13 100644
--- a/src/runtime/traceback.go
+++ b/src/runtime/traceback.go
@@ -116,6 +116,7 @@ func gentraceback(pc0, sp0, lr0 uintptr, gp *g, skip int, pcbuf *uintptr, max in
 	}
 	waspanic := false
 	cgoCtxt := gp.cgoCtxt
+	stack := gp.stack
 	printing := pcbuf == nil && callback == nil
 
 	// If the PC is zero, it's likely a nil function call.
@@ -134,7 +135,7 @@ func gentraceback(pc0, sp0, lr0 uintptr, gp *g, skip int, pcbuf *uintptr, max in
 	if !f.valid() {
 		if callback != nil || printing {
 			print("runtime: unknown pc ", hex(frame.pc), "\n")
-			tracebackHexdump(gp.stack, &frame, 0)
+			tracebackHexdump(stack, &frame, 0)
 		}
 		if callback != nil {
 			throw("unknown pc")
@@ -194,12 +195,15 @@ func gentraceback(pc0, sp0, lr0 uintptr, gp *g, skip int, pcbuf *uintptr, max in
 					frame.fn = findfunc(frame.pc)
 					f = frame.fn
 					flag = f.flag
+					frame.lr = gp.m.curg.sched.lr
 					frame.sp = gp.m.curg.sched.sp
+					stack = gp.m.curg.stack
 					cgoCtxt = gp.m.curg.cgoCtxt
 				case funcID_systemstack:
 					// systemstack returns normally, so just follow the
 					// stack transition.
 					frame.sp = gp.m.curg.sched.sp
+					stack = gp.m.curg.stack
 					cgoCtxt = gp.m.curg.cgoCtxt
 					flag &^= funcFlag_SPWRITE
 				}
@@ -268,7 +272,7 @@ func gentraceback(pc0, sp0, lr0 uintptr, gp *g, skip int, pcbuf *uintptr, max in
 				}
 				if callback != nil || doPrint {
 					print("runtime: unexpected return pc for ", funcname(f), " called from ", hex(frame.lr), "\n")
-					tracebackHexdump(gp.stack, &frame, lrPtr)
+					tracebackHexdump(stack, &frame, lrPtr)
 				}
 				if callback != nil {
 					throw("unknown caller pc")
@@ -497,6 +501,13 @@ func gentraceback(pc0, sp0, lr0 uintptr, gp *g, skip int, pcbuf *uintptr, max in
 			break
 		}
 
+		if frame.pc == frame.lr && frame.sp == frame.fp {
+			// If the next frame is identical to the current frame, we cannot make progress.
+			print("runtime: traceback stuck. pc=", hex(frame.pc), " sp=", hex(frame.sp), "\n")
+			tracebackHexdump(stack, &frame, frame.sp)
+			throw("traceback stuck")
+		}
+
 		// Unwind to next frame.
 		frame.fn = flr
 		frame.pc = frame.lr