From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8FFFDC04E69 for ; Thu, 10 Aug 2023 14:44:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235897AbjHJOn7 (ORCPT ); Thu, 10 Aug 2023 10:43:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46832 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235890AbjHJOn5 (ORCPT ); Thu, 10 Aug 2023 10:43:57 -0400 Received: from mail.alien8.de (mail.alien8.de [65.109.113.108]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3C40226A0 for ; Thu, 10 Aug 2023 07:43:57 -0700 (PDT) Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.alien8.de (SuperMail on ZX Spectrum 128k) with ESMTP id 7D6AB40E01A1; Thu, 10 Aug 2023 14:43:55 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at mail.alien8.de Authentication-Results: mail.alien8.de (amavisd-new); dkim=pass (4096-bit key) header.d=alien8.de Received: from mail.alien8.de ([127.0.0.1]) by localhost (mail.alien8.de [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id aLHMl40-ushH; Thu, 10 Aug 2023 14:43:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=alien8; t=1691678633; bh=ArANne49dbxlITExbmt0RFdovHJvV5KiGYWWtf+AXvQ=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=HJ84YJBdNJOsIe+5ijOAb2er/oeG0LLswEeXg7BiXbyBFGIU3dYNzjJJVVNd6qmy8 aKfpj44MXC79QZogRJod9zDQQeH3QYWcp2WEqnMNI19kQrYE3Bn8zZ9u1i4/6Yjxvu zW3Vt/KFKe+uZ9oqJmkLU2KfQh7RvCsX4rop99vc4zJeELFm9LBy4UrpKN7OA8nHWU F6B+Ep45EowlGuGeba4JQnDwJbdpdKaMfosJymfQOGfvJj2C4SFa3VsFhXhaubS488 HbZ5alq7EQ4+b03+xR9RZXmXG1ERz8h+SQSOCkci6gHM+NhvlAC5vbjkHopElCcA/F kYftPd48jrFc096fOOuIJyGHAVY0lHB6JocE7tCK2AvqMYgTh/XKnUfs25yaX7CBXK hzCnY9zLJkHxnSS7bnO/Umq93+0Y+ZquKWYo7QHTwIixPK0CRrpageMTOZmN/hph50 cSQGLoU7KEAf51oFWi6m41gDA5r9m4YevG56ZC6zJ7NofVRGpRw0KiaTNaxEFIIYxN ClK6hiTiwiKTkj7b766OJERD/tu1ckw/mA3FZK4YfiVQhB2Vu6pqguGCqmFRoVQ6At +iMc7E9gQLyEqEtaNHuXrz2Ce+I8tAd78vrMBmfx9AN5OL7SryIJke9vaMh7l7umV2 Rr81vziKIOSCsrIEyhtrU/7w= Received: from zn.tnic (pd9530d32.dip0.t-ipconnect.de [217.83.13.50]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature ECDSA (P-256) server-digest SHA256) (No client certificate requested) by mail.alien8.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 1C0F040E0140; Thu, 10 Aug 2023 14:43:49 +0000 (UTC) Date: Thu, 10 Aug 2023 16:43:44 +0200 From: Borislav Petkov To: Nathan Chancellor Cc: x86@kernel.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev Subject: Re: Hang when booting guest kernels compiled with clang after SRSO mitigations Message-ID: <20230810144344.GLZNT3oM6MLVdzGlyd@fat_crate.local> References: <20230810013334.GA5354@dev-arch.thelio-3990X> <20230810081038.GAZNSbftb6DOgg/U7e@fat_crate.local> <20230810090835.GBZNSpE6tCw+Ci+9yh@fat_crate.local> <20230810101649.GA1795474@dev-arch.thelio-3990X> <20230810125122.GIZNTdSuFvA3Cjfexq@fat_crate.local> <20230810132706.GA3805855@dev-arch.thelio-3990X> <20230810133216.GKZNTm4KpohRR4gVsT@fat_crate.local> <20230810134056.GA130730@dev-arch.thelio-3990X> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20230810134056.GA130730@dev-arch.thelio-3990X> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Aug 10, 2023 at 06:40:56AM -0700, Nathan Chancellor wrote: > 6.5.0-rc5-00039-g138bcddb86d8 (nathan@dev-arch.thelio-3990X) (x86_64-linux-gcc (GCC) 13.2.0, GNU ld (GNU Binutils) 2.41) #1 SMP PREEMPT_DYNAMIC Wed Aug 9 17:34:43 MST 2023 Mine: Linux version 6.5.0-rc5+ (root@vh) (gcc (Debian 10.2.1-3) 10.2.1 20201224, GNU ld (GNU Binutils for Debian) 2.40) #1 SMP PREEMPT_DYNAMIC Thu Aug 10 16:13:54 CEST 2023 ... [ 0.083541] Speculative Return Stack Overflow: Mitigation: safe RET > Guest kernel string: > > 6.5.0-rc5 (nathan@dev-arch.thelio-3990X) (ClangBuiltLinux clang version 16.0.6 (https://github.com/llvm/llvm-project 7cbf1a2591520c2491aa35339f227775f4d3adf6), GNU ld (GNU Binutils) 2.41.50.20230809) #1 SMP PREEMPT_DYNAMIC Wed Aug 9 16:54:33 MST 2023 > Mine: [ 0.000000] Linux version 6.5.0-rc5 (root@vh) (Debian clang version 14.0.6, GNU ld (GNU Binutils for Debian) 2.40) #1 SMP PREEMPT_DYNAMIC Thu Aug 10 13:22:30 CEST 2023 Guest and host are up and running. There's something else missing. Your host gcc is 13, maybe I should update... -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette