D21369.diff
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	diff --git a/src/infrastructure/util/PhabricatorGlobalLock.php b/src/infrastructure/util/PhabricatorGlobalLock.php
	--- a/src/infrastructure/util/PhabricatorGlobalLock.php
	+++ b/src/infrastructure/util/PhabricatorGlobalLock.php
	@@ -144,6 +144,18 @@

	$ok = head($result);
	if (!$ok) {
	+
	+ // See PHI1794. We failed to acquire the lock, but the connection itself
	+ // is still good. We're done with it, so add it to the pool, just as we
	+ // would if we were releasing the lock.
	+
	+ // If we don't do this, we may establish a huge number of connections
	+ // very rapidly if many workers try to acquire a lock at once. For
	+ // example, this can happen if there are a large number of webhook tasks
	+ // in the queue.
	+
	+ self::$pool[] = $conn;
	+
	throw id(new PhutilLockException($lock_name))
	->setHint($this->newHint($lock_name, $wait));
	}