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Cherry Mui bed2b7cf41 runtime: delay incrementing freeindex in malloc 
When the GC is scanning some memory (possibly conservatively),
finding a pointer, while concurrently another goroutine is
allocating an object at the same address as the found pointer, the
GC may see the pointer before the object and/or the heap bits are
initialized. This may cause the GC to see bad pointers and
possibly crash.

To prevent this, we make it that the scanner can only see the
object as allocated after the object and the heap bits are
initialized. As the scanner uses the freeindex to determine if an
object is allocated, we delay the increment of freeindex after the
initialization.

As currently in some code path finding the next free index and
updating the free index to a new slot past it is coupled, this
needs a small refactoring. In the new code mspan.nextFreeIndex
return the next free index but not update it (although allocCache
is updated). mallocgc will update it at a later time.

Fixes #54596.

Change-Id: I6dd5ccf743f2d2c46a1ed67c6a8237fe09a71260
Reviewed-on: https://go-review.googlesource.com/c/go/+/427619
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Cherry Mui <cherryyz@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
 		2022-11-11 18:33:54 +00:00
.github .github: update issue label for pkgsite-removal 2022-09-07 16:00:20 +00:00
api net/http: add ResponseController and per-handler timeouts 2022-11-10 18:18:03 +00:00
doc doc/go1.20: add a release note for os/exec API changes 2022-11-09 22:04:07 +00:00
lib/time lib/time, time/tzdata: update to 2022b 2022-08-11 20:03:19 +00:00
misc misc/cgo/test: skip Test9400 on Alpine 2022-11-07 21:15:29 +00:00
src runtime: delay incrementing freeindex in malloc 2022-11-11 18:33:54 +00:00
test test: add regression test for issue 53439 2022-11-11 14:48:29 +00:00
.gitattributes all: treat all files as binary, but check in .bat with CRLF 2020-06-08 15:31:43 +00:00
.gitignore internal/buildcfg: move build configuration out of cmd/internal/objabi 2021-04-16 19:20:53 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
LICENSE
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README.md README: update from CC-BY-3.0 to CC-BY-4.0 2022-11-02 20:14:56 +00:00
SECURITY.md SECURITY.md: replace golang.org with go.dev 2022-04-26 19:59:47 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +00:00

README.md

The Go Programming Language

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

Gopher image Gopher image by Renee French, licensed under Creative Commons 4.0 Attributions license.

Our canonical Git repository is located at https://go.googlesource.com/go. There is a mirror of the repository at https://github.com/golang/go.

Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.

Download and Install

Binary Distributions

Official binary distributions are available at https://go.dev/dl/.

After downloading a binary release, visit https://go.dev/doc/install for installation instructions.

Install From Source

If a binary distribution is not available for your combination of operating system and architecture, visit https://go.dev/doc/install/source for source installation instructions.

Contributing

Go is the work of thousands of contributors. We appreciate your help!

To contribute, please read the contribution guidelines at https://go.dev/doc/contribute.

Note that the Go project uses the issue tracker for bug reports and proposals only. See https://go.dev/wiki/Questions for a list of places to ask questions about the Go language.