linux-kernel - Re: [PATCH V4 2/2] perf/x86/intel/ds: Delay the threshold update

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Message-ID: <20230504091123.GJ1734100@hirez.programming.kicks-ass.net>
Date:   Thu, 4 May 2023 11:11:23 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     kernel test robot <yujie.liu@...el.com>
Cc:     kan.liang@...ux.intel.com, oe-lkp@...ts.linux.dev, lkp@...el.com,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        mingo@...hat.com, eranian@...gle.com, ak@...ux.intel.com
Subject: Re: [PATCH V4 2/2] perf/x86/intel/ds: Delay the threshold update

On Tue, Apr 25, 2023 at 03:16:29PM +0800, kernel test robot wrote:
> Hello,
> 
> kernel test robot noticed "Kernel_panic-not_syncing:Timeout:Not_all_CPUs_entered_broadcast_exception_handler" on:
> 
> commit: a17c97370d1fb9b2eac75c85136a1f70ec44eded ("[PATCH V4 2/2] perf/x86/intel/ds: Delay the threshold update")
> url: https://github.com/intel-lab-lkp/linux/commits/kan-liang-linux-intel-com/perf-x86-intel-ds-Delay-the-threshold-update/20230422-024743
> base: https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git 15def34e2635ab7e0e96f1bc32e1b69609f14942
> patch link: https://lore.kernel.org/all/20230421184529.3320912-2-kan.liang@linux.intel.com/
> patch subject: [PATCH V4 2/2] perf/x86/intel/ds: Delay the threshold update
> 
> in testcase: kvm-unit-tests-qemu
> 
> compiler: gcc-11
> test machine: 224 threads 2 sockets Intel(R) Xeon(R) Platinum 8480+ (Sapphire Rapids) with 256G memory
> 
> (please refer to attached dmesg/kmsg for entire log/backtrace)
> 
> 
> If you fix the issue, kindly add following tag
> | Reported-by: kernel test robot <yujie.liu@...el.com>
> | Link: https://lore.kernel.org/oe-lkp/202304251457.d108dbb3-yujie.liu@intel.com
> 
> 
> [  179.997768][ T2324] 2023-04-23 15:30:10 ./run_tests.sh
> ...
> [  180.442663][T20263] x86/split lock detection: #AC: qemu-system-x86/20263 took a split_lock trap at address: 0x1e3
> [  182.372875][ T2324] 

I'm going to try and replicate this on my ADL which should have
split_lock crud on. How does one run this kvm-unit-test stuff, inside
kvm or on bare metal?