Import wiredtiger: c91b80412603f283532e267893f9238dd4a5ec0f from branch mongodb-4.2

ref: 65531924e3..c91b804126
for: 4.1.2

WT-3856       Create a test that runs recovery to different points of time with schema operations
WT-4026       Add implementation for existing file extension configuration API
WT-4193       test/format snapshot-isolation search mismatch
WT-4194       Improve fairness of eviction with multiple tables
WT-4207       Coverity #1394567: null pointer dereference
WT-4210       schema abort child process failing prematurely
WT-4215       Allow recovery of backup without salvage
WT-4229       Lint
WT-4234       Remove documentation mention of legacy tool statlog.py
WT-4235       Fix workgen tracking of table state across workloads
WT-4242       New log file extension Python test failure

1 files changed, 4 insertions, 2 deletions

diff --git a/src/third_party/wiredtiger/test/csuite/schema_abort/main.c b/src/third_party/wiredtiger/test/csuite/schema_abort/main.c
index 735faa417c3..ff0b74edcad 100644
--- a/src/third_party/wiredtiger/test/csuite/schema_abort/main.c
+++ b/src/third_party/wiredtiger/test/csuite/schema_abort/main.c
@@ -537,7 +537,6 @@ thread_ckpt_run(void *arg)
 	testutil_check(td->conn->open_session(td->conn, NULL, NULL, &session));
 	first_ckpt = true;
 	ts = 0;
-	__wt_epoch(NULL, &start);
 	for (i = 0; ;++i) {
 		sleep_time = __wt_random(&rnd) % MAX_CKPT_INVL;
 		sleep(sleep_time);
@@ -555,9 +554,12 @@ thread_ckpt_run(void *arg)
 		/*
 		 * Create the checkpoint file so that the parent process knows
 		 * at least one checkpoint has finished and can start its
-		 * timer.
+		 * timer. Start the timer for stable after the first checkpoint
+		 * completes because a slow I/O lag during the checkpoint can
+		 * cause a false positive for a timeout.
 		 */
 		if (first_ckpt) {
+			__wt_epoch(NULL, &start);
 			testutil_checksys((fp = fopen(ckpt_file, "w")) == NULL);
 			first_ckpt = false;
 			testutil_checksys(fclose(fp) != 0);