linux-kernel - Re: Fwd: Persistent rt_sigreturn segfaults on KVM VMs after upgrade to 5.15

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Date:   Fri, 19 May 2023 15:19:32 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Regressions <regressions@...ts.linux.dev>,
        Linux KVM <kvm@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>, Theodor Milkov <tm@....bg>
Subject: Re: Fwd: Persistent rt_sigreturn segfaults on KVM VMs after upgrade
 to 5.15

On 5/18/23 22:01, Sean Christopherson wrote:
> On Thu, May 18, 2023, Bagas Sanjaya wrote:
>> On 5/18/23 20:57, Bagas Sanjaya wrote:
>>> Hi,
>>>
>>> I notice a regression report on Bugzilla [1]. Quoting from it:
>>>
>>>> I'm experiencing sporadic but persistent segmentation faults on the KVM
>>>> VMs I manage. These faults began appearing after upgrading from Linux
>>>> Kernel 4.x to 5.15.59. I further upgraded to 5.15.91 and transitioned the
>>>> userspace from Debian 10 (buster) to Debian 11 (bullseye), yet the issues
>>>> persist. Notably, the libc has also changed in the process as seen in the
>>>> following error logs:
> 
> Was the host or guest kernel upgraded?  If the guest kernel was upgraded, it's
> unlikely, though still possible, that this is a KVM bug.
> 

The reporter [1] said that this regression occurs on guest kernel.

[1]: https://bugzilla.kernel.org/show_bug.cgi?id=217457#c3

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