From 368c40116434532dc0b53b72fa04788ca6742898 Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <iant@golang.org>
Date: Tue, 27 Oct 2020 16:09:40 -0700
Subject: runtime: block signals in needm before allocating M

Otherwise, if a signal occurs just after we allocated the M,
we can deadlock if the signal handler needs to allocate an M
itself.

Fixes #42207

Change-Id: I76f44547f419e8b1c14cbf49bf602c6e645d8c14
Reviewed-on: https://go-review.googlesource.com/c/go/+/265759
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
---
 src/runtime/os_plan9.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/runtime/os_plan9.go')

diff --git a/src/runtime/os_plan9.go b/src/runtime/os_plan9.go
index f3037a7508..62aecea060 100644
--- a/src/runtime/os_plan9.go
+++ b/src/runtime/os_plan9.go
@@ -184,7 +184,7 @@ func mpreinit(mp *m) {
 	mp.errstr = (*byte)(mallocgc(_ERRMAX, nil, true))
 }
 
-func msigsave(mp *m) {
+func sigsave(p *sigset) {
 }
 
 func msigrestore(sigmask sigset) {
-- 
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