From 29cde917fe6b8f2e669c8bf10b38f640045c83b8 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Thu, 27 Feb 2014 13:31:33 +0100
Subject: [PATCH] Fix deadlock in SubstitutionGoal

We were relying on SubstitutionGoal's destructor releasing the lock,
but if a goal is a top-level goal, the destructor won't run in a
timely manner since its reference count won't drop to zero.  So
release it explicitly.

Fixes #178.
---
 src/libstore/build.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index e2115bc80..cec03fee4 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -2852,6 +2852,7 @@ void SubstitutionGoal::finished()
     worker.store.registerValidPath(info2);
 
     outputLock->setDeletion(true);
+    outputLock.reset();
 
     worker.store.markContentsGood(storePath);