linux-kernel - Re: [linus:master] [perf/x86] 88ec7eedbb: kvm-unit-tests.pmu

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Message-ID: <f872c998-c076-4e09-8f7d-1ad29a065d4a@linux.intel.com>
Date: Mon, 7 Apr 2025 10:38:53 -0400
From: "Liang, Kan" <kan.liang@...ux.intel.com>
To: kernel test robot <oliver.sang@...el.com>,
 Dapeng Mi <dapeng1.mi@...ux.intel.com>
Cc: oe-lkp@...ts.linux.dev, lkp@...el.com, linux-kernel@...r.kernel.org,
 Ingo Molnar <mingo@...nel.org>, Ravi Bangoria <ravi.bangoria@....com>,
 Peter Zijlstra <peterz@...radead.org>, linux-perf-users@...r.kernel.org
Subject: Re: [linus:master] [perf/x86] 88ec7eedbb: kvm-unit-tests.pmu_lbr.fail



On 2025-04-07 1:07 a.m., kernel test robot wrote:
> 
> 
> Hello,
> 
> kernel test robot noticed "kvm-unit-tests.pmu_lbr.fail" on:
> 
> commit: 88ec7eedbbd21cad38707620ad6c48a4e9a87c18 ("perf/x86: Fix low freqency setting issue")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
> 
> [test failed on linus/master      0a87d6bb6fd274cde3bf217a821153714374198f]
> [test failed on linux-next/master fefb886b1344e222b3218f3c0165b0fd770e8b88]
> 
> in testcase: kvm-unit-tests
> version: kvm-unit-tests-x86_64-69574079-1_20250322
> with following parameters:

The one line patch only impacts the perf record.
But the test case is for LBR on KVM. The case directly access the
IA32_DEBUGCTLMSR to enable/disable LBRs. There is nothing related.
It is probably a false alarm.

+ Dapeng

Could you please take a look at the qemu test case?

Thanks,
Kan>
> 
> config: x86_64-rhel-9.4-func
> compiler: gcc-12
> test machine: 8 threads 1 sockets Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz (Haswell) with 8G memory
> 
> (please refer to attached dmesg/kmsg for entire log/backtrace)
> 
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <oliver.sang@...el.com>
> | Closes: https://lore.kernel.org/oe-lkp/202504071232.3c2fa7d5-lkp@intel.com
> 
> 
> ...
> .[32mPASS.[0m pmu (143 tests, 14 skipped)
> .[31mFAIL.[0m pmu_lbr (2 tests, 1 unexpected failures)   <---
> .[33mSKIP.[0m pmu_pebs (1 tests, 1 skipped)
> ...
> 
> 
> one log is attached.
> 
> 
> The kernel config and materials to reproduce are available at:
> https://download.01.org/0day-ci/archive/20250407/202504071232.3c2fa7d5-lkp@intel.com
> 
> 
>