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 X-Spam-Level: * X-Spam-Status: No, score=1.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FSL_HELO_FAKE,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A4940C43381 for ; Thu, 21 Mar 2019 21:37:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 678AD218A5 for ; Thu, 21 Mar 2019 21:37:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="hhyi3Qim" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726533AbfCUVhs (ORCPT ); Thu, 21 Mar 2019 17:37:48 -0400 Received: from mail-pg1-f175.google.com ([209.85.215.175]:34458 "EHLO mail-pg1-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726529AbfCUVhr (ORCPT ); Thu, 21 Mar 2019 17:37:47 -0400 Received: by mail-pg1-f175.google.com with SMTP id v12so5104384pgq.1 for ; Thu, 21 Mar 2019 14:37:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=date:from:to:cc:subject:message-id:mime-version:content-disposition :user-agent; bh=THzW1HILTPsdNtUZJcKDeuWFMKo1zCGvPxfYXYhNlRY=; b=hhyi3QimoVHj8HUHuSmNSYyijDdcIvWzmsvngXbaCuDh+3Hvpk921Ttk3xS2GJYtni y/Oua63w6adKaSqbkQ7bcj/E4UvY91jCHpqOb1aMxL0oYTdgsb10+0qSe1vZPpK73uZ/ ulqXS8TZzt8/4MHx+mYg68AXA0+dyCG9yuy+E= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:mime-version :content-disposition:user-agent; bh=THzW1HILTPsdNtUZJcKDeuWFMKo1zCGvPxfYXYhNlRY=; b=BTCyZbx8+SV1tJj/9HdPJQoGR9o1QIdKn9eh8x8VOnyxaKl/wOLtA4T641rUEP2Jx9 eX/5WVE90hkumpv4U0Mg/995Qsq9id/0/4hgKzDcPEa7feMwyYkQGkaSLWJoSJvRL4LD kO+RdQVoedtrj+8hhEEkQIyqGAk4esDhmaSTgOUey9lRwoQXiBs52328yNAwRPoOo82n ZFSouToQsbiYBKzUpqg1iTFC59XBUo5Sz2A6RZLlBpIbFm/K5kG3a5sLxu5gK4VHcwF+ RxVx1f0jvPT6arugMADuNs0LDrxcTGNMfVwOyK29LFmk3E57dBfrI90+CwqWVQD9ploq WQRg== X-Gm-Message-State: APjAAAVE7BrXBnBrrWvbRYccTt9It5r/XwWmtz1oyShZTiaLFB7sQRuZ im04MzgqAQpksvOaWyA7Kifg2ORldX0= X-Google-Smtp-Source: APXvYqyn9/6YMMCvS1JY7cWzPiBqO0TvLPOylZaJgQodURVXDbl+akLzIIYFAkTthLi2iejWu0dvTQ== X-Received: by 2002:a17:902:29ca:: with SMTP id h68mr5869284plb.297.1553204266591; Thu, 21 Mar 2019 14:37:46 -0700 (PDT) Received: from google.com ([2620:15c:202:201:49ea:b78f:4f04:4d25]) by smtp.googlemail.com with ESMTPSA id n9sm4905453pff.43.2019.03.21.14.37.45 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 21 Mar 2019 14:37:45 -0700 (PDT) Date: Thu, 21 Mar 2019 14:37:39 -0700 From: Zubin Mithra To: stable@vger.kernel.org Cc: groeck@chromium.org, gregkh@linuxfoundation.org, kernellwp@gmail.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com Subject: bbeac2830f4d ("KVM: X86: Fix residual mmio emulation request to userspace") Message-ID: <20190321213737.GA181869@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org Hello, Syzkaller has triggered a warning when fuzzing a 4.4 kernel with the following stacktrace. Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xba/0x10e lib/dump_stack.c:51 [] panic+0x1c4/0x389 kernel/panic.c:116 [] __warn+0x175/0x1be kernel/panic.c:470 [] warn_slowpath_null+0x3d/0x42 kernel/panic.c:514 [] kvm_arch_vcpu_ioctl_run+0x2ce/0x35a3 arch/x86/kvm/x86.c:6896 [] kvm_vcpu_ioctl+0x37f/0xa83 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2437 [] vfs_ioctl fs/ioctl.c:43 [inline] [] do_vfs_ioctl+0xcb6/0xd15 fs/ioctl.c:630 [] SYSC_ioctl fs/ioctl.c:645 [inline] [] SyS_ioctl+0x6d/0xa8 fs/ioctl.c:636 [] entry_SYSCALL_64_fastpath+0x31/0xb3 Could the following patch be applied to v4.4.y and 4.9.y? * bbeac2830f4d ("KVM: X86: Fix residual mmio emulation request to userspace") Tests run: * Chrome OS tryjobs * Syzkaller reproducer Thanks, - Zubin