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From: Li Wang <liwang@redhat.com>
To: ltp@lists.linux.it
Subject: [LTP] [PATCH] clock_gettime04: print more info to help debugging
Date: Mon,  8 Mar 2021 06:53:29 +0000	[thread overview]
Message-ID: <20210308065329.25824-1-liwang@redhat.com> (raw)

We get some sporadically failures like below, but we don't know which
loop it comes from. So adding more prints to help locate issue.

  tst_test.c:1286: TINFO: Timeout per run is 0h 05m 00s
  vdso_helpers.c:76: TINFO: Couldn't find vdso_gettime64()
  clock_gettime04.c:157: TPASS: CLOCK_REALTIME: Difference between successive readings is reasonable
  clock_gettime04.c:150: TFAIL: CLOCK_REALTIME_COARSE: Difference between successive readings greater than 5 ms (1): 8
  clock_gettime04.c:157: TPASS: CLOCK_MONOTONIC: Difference between successive readings is reasonable
  clock_gettime04.c:150: TFAIL: CLOCK_MONOTONIC_COARSE: Difference between successive readings greater than 5 ms (0): 5
  clock_gettime04.c:157: TPASS: CLOCK_MONOTONIC_RAW: Difference between successive readings is reasonable
  clock_gettime04.c:157: TPASS: CLOCK_BOOTTIME: Difference between successive readings is reasonable

Btw, it occurs on a x86_64 (not virtualized) with kernel 5.11.0.

Signed-off-by: Li Wang <liwang@redhat.com>
---
 testcases/kernel/syscalls/clock_gettime/clock_gettime04.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/testcases/kernel/syscalls/clock_gettime/clock_gettime04.c b/testcases/kernel/syscalls/clock_gettime/clock_gettime04.c
index 5f8264cc6..4dc9093c7 100644
--- a/testcases/kernel/syscalls/clock_gettime/clock_gettime04.c
+++ b/testcases/kernel/syscalls/clock_gettime/clock_gettime04.c
@@ -108,6 +108,9 @@ static void run(unsigned int i)
 			if (tv->clock_gettime == my_gettimeofday && clks[i] != CLOCK_REALTIME)
 				continue;
 
+			if (tv->clock_gettime && count == 10000)
+				tst_res(TINFO, "%s", tv->desc);
+
 			ret = tv->clock_gettime(clks[i], tst_ts_get(&ts));
 			if (ret) {
 				/*
-- 
2.21.3


             reply	other threads:[~2021-03-08  6:53 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-08  6:53 Li Wang [this message]
2021-03-08 10:17 ` [LTP] [PATCH] clock_gettime04: print more info to help debugging Viresh Kumar
2021-03-08 10:59   ` Li Wang
2021-03-08 11:14     ` Viresh Kumar
2021-03-08 11:24       ` Li Wang
2021-03-08 11:48         ` Viresh Kumar
2021-03-08 12:45           ` Li Wang
2021-03-09  4:05             ` Viresh Kumar

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