sync_lsn assertion failure

ERROR: test_txn14.test_txn14.test_log_flush(bg) (subunit.RemotedTestCase)

test_txn14.test_txn14.test_log_flush(bg)

#4  0x00007f404bfe6cb7 in __log_file_server (arg=0x2c6f170) at ../src/conn/conn_log.c:344

344		WT_ASSERT(session, __wt_log_cmp(

345			&close_end_lsn, &log->sync_lsn) >= 0);

(gdb) print close_end_lsn

$1 = {file = 14, offset = 0}

(gdb) print log->sync_lsn

$2 = {file = 14, offset = 83584}