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Michael Anthony Knyszek 95d0657670 test/recover4.go: use mprotect to create a hole instead of munmap 
Currently the recover4 test, which recovers from a panic created from a
fault, generates a fault by creating a hole in a mapping. It does this
via munmap. However, it's possible the runtime can create a new mapping
that ends up in that hole, for example if the GC executes, causing the
test to fail.

In fact, this is the case now with a smaller minimum heap size.

Modify the test to use mprotect, and clean up the code a little while
we're here: define everything in terms of the length of original
mapping, deduplicate some constants and expressions, and have the test
recover properly even if recover() returns nil (right now it panics
because it fails to type assert nil as error).

Fixes #49381.

Change-Id: If399eca564466e5e8aeb2dc6f86a246d0fce7b5d
Reviewed-on: https://go-review.googlesource.com/c/go/+/363534
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
2021-11-12 16:58:34 +00:00
.github .github: update IRC server 2021-09-30 19:56:27 +00:00
api syscall: migrate new UDP send/recv API to internal/syscall/unix 2021-11-03 21:45:33 +00:00
doc spec: fix a broken link 2021-11-11 19:44:13 +00:00
lib/time lib/time, time/tzdata: update to 2021e 2021-11-11 05:16:39 +00:00
misc misc/cgo/testshared: correct test of gccgo version number 2021-11-11 04:54:05 +00:00
src reflect: keep pointer in aggregate-typed args live in Call 2021-11-12 14:56:58 +00:00
test test/recover4.go: use mprotect to create a hole instead of munmap 2021-11-12 16:58:34 +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
AUTHORS A+C: add Leonard Wang (individual CLA) 2021-11-02 06:25:39 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS A+C: add Leonard Wang (individual CLA) 2021-11-02 06:25:39 +00:00
LICENSE
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README.md README.md: update contribute URL 2021-09-30 13:33:21 +00:00
SECURITY.md SECURITY.md: update go versions 2019-09-26 15:34:57 +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.

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

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To contribute, please read the contribution guidelines at https://golang.org/doc/contribute.

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