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Austin Clements 2d4c1ff739 runtime: don't create heap hints outside TSAN's supported heap 
TSAN for Go only supports heap address in the range [0x00c000000000,
0x00e000000000). However, we currently create heap hints of the form
0xXXc000000000 for XX between 0x00 and 0x7f. Even for XX=0x01, this
hint is outside TSAN's supported heap address range.

Fix this by creating a slightly different set of hints in race mode,
all of which fall inside TSAN's heap address range.

This should fix TestArenaCollision flakes. That test forces the
runtime to use later heap hints. Currently, this always results in
TSAN "failed to allocate" failures on Windows (which happens to have a
slightly more constrained TSAN layout than non-Windows). Most of the
time we don't notice these failures, but sometimes it crashes TSAN,
leading to a test failure.

Fixes #25698.

Change-Id: I8926cd61f0ee5ee00efa77b283f7b809c555be46
Reviewed-on: https://go-review.googlesource.com/123780
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
2018-07-19 18:12:51 +00:00
.github .github: use HTTPS for Stack Overflow link in SUPPORT.md 2018-06-12 11:08:14 +00:00
api syscall: convert Windows AddrinfoW.Addr from uintptr to syscall.Pointer 2018-07-12 15:36:15 +00:00
doc doc: remove paragraph about text/template/parse 2018-07-19 14:33:23 +00:00
lib/time lib/time: update vendored tzdata to release 2018e 2018-06-11 14:47:06 +00:00
misc cmd/cgo: don't report inconsistency error for incomplete typedef 2018-07-18 04:17:51 +00:00
src runtime: don't create heap hints outside TSAN's supported heap 2018-07-19 18:12:51 +00:00
test cmd/compile: add test for OPmodify ops clobbering flags 2018-07-19 16:24:53 +00:00
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README.md

The Go Programming Language

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