timers:inconsistency-check from ubuntu_kernel_selftests flaky on AWS / Azure cloud

Bug #2055844 reported by Po-Hsu Lin
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
ubuntu-kernel-tests
New
Undecided
Unassigned

Bug Description

Back in s2023.10.30 and 2024.01.08 I noticed that we're having some timers:inconsistency-check failure in ubuntu_kernel_selftests with AWS / Azure cloud instances (M-aws a1.medium, c3.xlarge, c5n.large. L-azure Standard_A2_v2, Standard_D4_v4. J-azure Standard_D4_v4, Standard_D4s_v3-gen2)

It appears to be flaky, retest can make them pass.

The 6th (CLOCK_REALTIME_COARSE) or the 7th (CLOCK_MONOTONIC_COARSE) test case will fail with small delta.

Test log:
 Running 'make run_tests -C timers TEST_PROGS=inconsistency-check TEST_GEN_PROGS='' TEST_CUSTOM_PROGS='''
 make: Entering directory '/home/azure/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/timers'
 TAP version 13
 1..1
 # selftests: timers: inconsistency-check
 # Consistent CLOCK_REALTIME [OK]
 # Consistent CLOCK_MONOTONIC [OK]
 # Consistent CLOCK_PROCESS_CPUTIME_ID [OK]
 # Consistent CLOCK_THREAD_CPUTIME_ID [OK]
 # Consistent CLOCK_MONOTONIC_RAW [OK]
 # Consistent CLOCK_REALTIME_COARSE Fri Mar 1 15:29:21 2024
 #
 # 1709306969:543644941
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 # 1709306969:543644941
 # --------------------
 # 1709306969:543644941
 # 1709306969:543644933
 # --------------------
 # 1709306969:543644933
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 # 1709306969:543644933
 # 1709306969:543644933
 # 1709306969:543644933
 # 1709306969:543644933
 # 1709306969:543644933
 # 1709306969:543644933
 # 1709306969:543644933
 # 1709306969:543644933
 # Delta: 8 ns
 # Fri Mar 1 15:29:29 2024
 #
 # [FAILED]
 # # Totals: pass:0 fail:0 xfail:0 xpass:0 skip:0 error:0
 not ok 1 selftests: timers: inconsistency-check # exit=1

Po-Hsu Lin (cypressyew)
summary: - timers:inconsistency-check from ubuntu_kernel_selftests flaky on Azure
- cloud
+ timers:inconsistency-check from ubuntu_kernel_selftests flaky on AWS /
+ Azure cloud
description: updated
Po-Hsu Lin (cypressyew)
description: updated
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