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

[Peter Zijlstra]

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@xxxxxxxxxxxxxxx/
> 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@xxxxxxxxx>
> | Link: https://lore.kernel.org/oe-lkp/202304251457.d108dbb3-yujie.liu@xxxxxxxxx
> 
> 
> [  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?