From ccd992355df7192993c666236047820244914598 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Tue, 16 Apr 2024 21:19:13 +0200 Subject: Adding upstream version 1.21.8. Signed-off-by: Daniel Baumann --- test/fixedbugs/issue27518a.go | 45 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 test/fixedbugs/issue27518a.go (limited to 'test/fixedbugs/issue27518a.go') diff --git a/test/fixedbugs/issue27518a.go b/test/fixedbugs/issue27518a.go new file mode 100644 index 0000000..d6224df --- /dev/null +++ b/test/fixedbugs/issue27518a.go @@ -0,0 +1,45 @@ +// run + +// Copyright 2018 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package main + +import ( + "runtime" +) + +var nilp *int +var forceHeap interface{} + +func main() { + // x is a pointer on the stack to heap-allocated memory. + x := new([32]*int) + forceHeap = x + forceHeap = nil + + // Push a defer to be run when we panic below. + defer func() { + // Ignore the panic. + recover() + // Force a stack walk. Go 1.11 will fail because x is now + // considered live again. + runtime.GC() + }() + // Make x live at the defer's PC. + runtime.KeepAlive(x) + + // x is no longer live. Garbage collect the [32]*int on the + // heap. + runtime.GC() + // At this point x's dead stack slot points to dead memory. + + // Trigger a sigpanic. Since this is an implicit panic, we + // don't have an explicit liveness map here. + // Traceback used to use the liveness map of the most recent defer, + // but in that liveness map, x will be live again even though + // it points to dead memory. The fix is to use the liveness + // map of a deferreturn call instead. + *nilp = 0 +} -- cgit v1.2.3