linux-kernel - Re: Perf: BUG: kernel NULL pointer dereference, address: 0000000000000198

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Message-ID: <5bec4620-2e2b-abe0-1e82-528c084d4d16@amd.com>
Date:   Wed, 26 Oct 2022 15:35:53 +0530
From:   Ravi Bangoria <ravi.bangoria@....com>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        linux-perf-users@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>,
        regressions@...ts.linux.dev, lkft-triage@...ts.linaro.org,
        Ravi Bangoria <ravi.bangoria@....com>
Subject: Re: Perf: BUG: kernel NULL pointer dereference, address:
 0000000000000198

On 25-Oct-22 6:36 PM, Ravi Bangoria wrote:
> 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.

Running perf test in a loop reproduced the issue after some iterations.

Thanks,
Ravi