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runtime: recursively disallow write barriers in sysmon

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sysmon runs without a P. This means it can't interact with the garbage
collector, so write barriers not allowed in anything that sysmon does.

Fixes #10600.

Change-Id: I9de1283900dadee4f72e2ebfc8787123e382ae88
Reviewed-on: https://go-review.googlesource.com/17006
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Austin Clements 2015-11-17 17:31:04 -05:00
parent 402e37d4a9
commit d2c81ad847
1 changed files with 3 additions and 0 deletions
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3
src/runtime/proc.go
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@ -3321,6 +3321,9 @@ func checkdead() {
// This is a variable for testing purposes. It normally doesn't change.
var forcegcperiod int64 = 2 * 60 * 1e9
// Always runs without a P, so write barriers are not allowed.
//
//go:nowritebarrierrec
func sysmon() {
// If a heap span goes unused for 5 minutes after a garbage collection,
// we hand it back to the operating system.