From 5ad981640f9e747e9c9d29c686084206e007f07b Mon Sep 17 00:00:00 2001
From: Tonis Tiigi <tonistiigi@gmail.com>
Date: Fri, 3 Apr 2020 15:33:15 -0700
Subject: [PATCH] builder: fix concurrent map write

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
---
 builder/builder-next/builder.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/builder/builder-next/builder.go b/builder/builder-next/builder.go
index b07e88e200..278f36dfef 100644
--- a/builder/builder-next/builder.go
+++ b/builder/builder-next/builder.go
@@ -240,7 +240,9 @@ func (b *Builder) Build(ctx context.Context, opt backend.BuildConfig) (*builder.
 		}
 
 		defer func() {
+			b.mu.Lock()
 			delete(b.jobs, buildID)
+			b.mu.Unlock()
 		}()
 	}