From: Ravi Bangoria <ravi.bangoria@amd.com>
To: Naresh Kamboju <naresh.kamboju@linaro.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
Borislav Petkov <bp@alien8.de>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
linux-perf-users@vger.kernel.org,
open list <linux-kernel@vger.kernel.org>,
regressions@lists.linux.dev, lkft-triage@lists.linaro.org
Subject: Re: Perf: BUG: kernel NULL pointer dereference, address: 0000000000000198
Date: Tue, 25 Oct 2022 18:36:46 +0530 [thread overview]
Message-ID: <d577887d-b86b-82be-8081-f7bebacd8067@amd.com> (raw)
In-Reply-To: <4429582f-155a-04d2-d139-a834bb325612@amd.com>
On 25-Oct-22 9:59 AM, Ravi Bangoria wrote:
> On 20-Oct-22 12:24 PM, Naresh Kamboju wrote:
>> Following kernel BUG noticed while running perf testing on qemu-x86-64.
>
> Thanks Naresh. I'm aware of the crash[1] but haven't got a chance to
> root cause it. Let me try to spend some time on it.
I tried to mimic https://lkft.validation.linaro.org/scheduler/job/5708609.
However, I don't see a way to download lava-guest.qcow2. So I just used
rootfs and kernel:
/usr/bin/qemu-system-x86_64 -cpu host -enable-kvm -nographic -net nic,model=virtio,macaddr=DE:AD:BE:EF:66:20 -net user -m 1024 -monitor none -kernel bzImage --append "root=/dev/sda rootwait console=ttyS0,115200" -hda lkft-console-image-intel-corei7-64-20221019172733.rootfs.ext4 -m 4096 -smp 4 -nographic
And I ran perf test inside the guest, which ran fine.
Would it be possible for you to redo the experiment and see if you are able
to reproduce it consistently.
Thanks,
Ravi
next prev parent reply other threads:[~2022-10-25 13:07 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-20 6:54 Perf: BUG: kernel NULL pointer dereference, address: 0000000000000198 Naresh Kamboju
2022-10-25 4:29 ` Ravi Bangoria
2022-10-25 13:06 ` Ravi Bangoria [this message]
2022-10-26 10:05 ` Ravi Bangoria
2022-11-03 11:45 ` Ravi Bangoria
2022-11-03 12:33 ` Peter Zijlstra
2022-11-03 16:12 ` Ravi Bangoria
2022-11-07 10:29 ` Ravi Bangoria
2022-11-14 4:40 ` [PATCH] perf/x86/amd: Fix crash due to race between amd_pmu_enable_all, perf NMI and throttling Ravi Bangoria
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