linux-kernel - Re: Linux 5.15.103

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Date:   Sat, 1 Apr 2023 09:23:53 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Mathias Krause <minipli@...ecurity.net>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, linux-kernel@...r.kernel.org,
        akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
        lwn@....net, jslaby@...e.cz,
        Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>
Subject: Re: Linux 5.15.103

On Tue, Mar 28, 2023 at 02:29:11PM +0200, Mathias Krause wrote:
>On 28.03.23 14:14, Greg Kroah-Hartman wrote:
>> On Tue, Mar 28, 2023 at 02:02:03PM +0200, Mathias Krause wrote:
>>> On 17.03.23 09:04, Greg Kroah-Hartman wrote:
>>>> I'm announcing the release of the 5.15.103 kernel.
>>>>
>>>> [...]
>>>>
>>>> Vitaly Kuznetsov (4):
>>>>       KVM: Optimize kvm_make_vcpus_request_mask() a bit
>>>>       KVM: Pre-allocate cpumasks for kvm_make_all_cpus_request_except()
>>>>       KVM: nVMX: Don't use Enlightened MSR Bitmap for L3
>>>>       KVM: VMX: Introduce vmx_msr_bitmap_l01_changed() helper
>>>>
>>>
>>> That list is missing commit 6470accc7ba9 ("KVM: x86: hyper-v: Avoid
>>> calling kvm_make_vcpus_request_mask() with vcpu_mask==NULL") to fulfill
>>> the prerequisite of "KVM: Optimize kvm_make_vcpus_request_mask() a bit".
>>>
>>> Right now the kvm selftests trigger a kernel NULL deref for the hyperv
>>> test, making the system hang.
>>>
>>> Please consider applying commit 6470accc7ba9 for the next v5.15.x release.
>>
>> It wasn't tagged for the stable kernels, so we didn't pick it up :(
>
>Neither were any of the above commits. o.O
>
>Commit 3e48a6349d29 ("KVM: Optimize kvm_make_vcpus_request_mask() a
>bit") has this tag, though:
>
>Stable-dep-of: 2b0128127373 ("KVM: Register /dev/kvm as the _very_ last
>thing during initialization")
>
>I don't know why, though. These two commits have little in common.
>Maybe Sasha knows why?

Because you've skipped the commit in the middle of the two you've
pointed out :)

3e48a6349d29 is needed by 0a0ecaf0988b ("KVM: Pre-allocate cpumasks for
kvm_make_all_cpus_request_except()"), which in turn is needed by
2b0128127373.

-- 
Thanks,
Sasha