From f34a5b5af018f0f7aa1d9aeeb4d6d7a7ef99f528 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>
(cherry picked from commit 5ad981640f9e747e9c9d29c686084206e007f07b)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
---
 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 f2e111ff48..10c0083a31 100644
--- a/builder/builder-next/builder.go
+++ b/builder/builder-next/builder.go
@@ -241,7 +241,9 @@ func (b *Builder) Build(ctx context.Context, opt backend.BuildConfig) (*builder.
 		}
 
 		defer func() {
+			b.mu.Lock()
 			delete(b.jobs, buildID)
+			b.mu.Unlock()
 		}()
 	}