linux-kernel - Re: [BUG net-next] arch/x86/kernel/cpu/bugs.c:2935: "Unpatched return thunk in use. This should not happen!" [STACKTRACE]

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Date: Tue, 26 Mar 2024 11:16:42 +0100
From: Borislav Petkov <bp@...en8.de>
To: Mirsad Todorovac <mirsad.todorovac@....unizg.hr>
Cc: x86@...nel.org, Sean Christopherson <seanjc@...gle.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	Fuad Tabba <tabba@...gle.com>, Marc Zyngier <maz@...nel.org>,
	Shaoqin Huang <shahuang@...hat.com>,
	David Matlack <dmatlack@...gle.com>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Breno Leitao <leitao@...ian.org>, kvm@...r.kernel.org
Subject: Re: [BUG net-next] arch/x86/kernel/cpu/bugs.c:2935: "Unpatched
 return thunk in use. This should not happen!" [STACKTRACE]

On Wed, Mar 20, 2024 at 02:28:57AM +0100, Mirsad Todorovac wrote:
> Please find the kernel .config attached.

Thanks, that's one huuuge kernel you're building. :)

> I got another one of these "Unpatched thunk" and it seems connected
> with selftest/kvm.
>
> But running selftests/kvm one by one did not trigger the bug.

Which commands are you exactly running?

I'll try to reproduce here.

Thx.

-- 
Regards/Gruss,
    Boris.

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