From 1dfd2cffcf1dc0cc49fe37e0f98daf8d464e0a5e Mon Sep 17 00:00:00 2001
From: Max Hirschhorn <max.hirschhorn@mongodb.com>
Date: Mon, 21 Dec 2015 12:53:34 -0500
Subject: [PATCH] SERVER-21835 Ignore errors due to CappedPositionLost in
 make_capped.js.

(cherry picked from commit 9736f7439eda1f6a7856c535683fda239be86e04)
---
 jstests/concurrency/fsm_workload_modifiers/make_capped.js | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/jstests/concurrency/fsm_workload_modifiers/make_capped.js b/jstests/concurrency/fsm_workload_modifiers/make_capped.js
index d17f291faa6..abe6ebc8264 100644
--- a/jstests/concurrency/fsm_workload_modifiers/make_capped.js
+++ b/jstests/concurrency/fsm_workload_modifiers/make_capped.js
@@ -35,6 +35,14 @@ function makeCapped($config, $super) {
                 // failures due to collection truncation
                 globalAssertLevel = AssertLevel.ALWAYS;
                 $super.states.find.apply(this, arguments);
+            } catch (e) {
+                if (e.message.indexOf('CappedPositionLost') >= 0) {
+                    // Ignore errors when a cursor's position in the capped collection is deleted.
+                    // Reads from the beginning of a capped collection are not guaranteed to succeed
+                    // when there are concurrent inserts that cause a truncation.
+                    return;
+                }
+                throw e;
             } finally {
                 globalAssertLevel = oldAssertLevel;
             }