From 8f6c54c8c023d551d6d09b5428ac59fb704c7067 Mon Sep 17 00:00:00 2001
From: Andrei Vagin <avagin@google.com>
Date: Tue, 17 Aug 2021 12:55:41 -0700
Subject: [PATCH] Deflake test/perf:randread_benchmark

The test expects that pread reads the full buffer, it means that the pread
offset has to be equal or less than file_size - buffer_size.

PiperOrigin-RevId: 391356863
---
 test/perf/linux/randread_benchmark.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/perf/linux/randread_benchmark.cc b/test/perf/linux/randread_benchmark.cc
index b0eb8c24e..11b56a8cb 100644
--- a/test/perf/linux/randread_benchmark.cc
+++ b/test/perf/linux/randread_benchmark.cc
@@ -85,7 +85,7 @@ void BM_RandRead(benchmark::State& state) {
   unsigned int seed = 1;
   for (auto _ : state) {
     TEST_CHECK(PreadFd(fd.get(), buf.data(), buf.size(),
-                       rand_r(&seed) % kFileSize) == size);
+                       rand_r(&seed) % (kFileSize - buf.size())) == size);
   }
 
   state.SetBytesProcessed(static_cast<int64_t>(size) *