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=-5.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 83FCBC433DF for ; Tue, 23 Jun 2020 12:17:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 660D12072E for ; Tue, 23 Jun 2020 12:17:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732543AbgFWMRS (ORCPT ); Tue, 23 Jun 2020 08:17:18 -0400 Received: from mail-il1-f200.google.com ([209.85.166.200]:52594 "EHLO mail-il1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729552AbgFWMRR (ORCPT ); Tue, 23 Jun 2020 08:17:17 -0400 Received: by mail-il1-f200.google.com with SMTP id v14so14311667ilo.19 for ; Tue, 23 Jun 2020 05:17:16 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=wlhuLVD4u+XXQ7HeSYAD3cLeISlYbuyy5YsqjwGO8Ac=; b=S5o+m5h8C9J66cp8a/0LzmEOO6a4/3j3BC8FqTR0+lLNm1bCrRFRx6m19s9YdJdenI ssHlDRQu0X0eCe4B8Yapo+7gxPSOytVqgjMrrlO5pnHDEZfiPVdDPczMZTDfYHCwWgqP HyS5oNE3jbwGdR0rrTXhqE+Q3TnjzkyuzIzqPGMIUITwqprDuxyezxzLJ9rssoeHL/vf ssfhIsyNn2pDZc/i7tc1iic4vjYS/Yt8mrKt2TpaSAO1FSyspZnwHuxGVRGBFCWhbyEA iu+RdrgLfrn3GwLOxjwKxcOuSkSWwBEjLeFZcmX9ljMy9sKsHmt8bDSvtxW02wajn8Ga 8M2Q== X-Gm-Message-State: AOAM530vxlm68XHqp6JPHdtOW4YT4rrxaqXBoPKUBL3GJBw/EEFYTolJ pvEqZW1HjhiGT9lCheRdB/vvNuGCMmGD5G78Phu5Yto9FR2d X-Google-Smtp-Source: ABdhPJyU4beGPn+n5GTW5K+FfN41A3Vtb/0AYshbsOeC1yWAFc6mdL777MAvP/4VCkWzyTUfevSP1uF075zX0wT6JKuF/ak8WPuo MIME-Version: 1.0 X-Received: by 2002:a6b:b984:: with SMTP id j126mr24459783iof.114.1592914635879; Tue, 23 Jun 2020 05:17:15 -0700 (PDT) Date: Tue, 23 Jun 2020 05:17:15 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000077a6505a8bf57b2@google.com> Subject: KASAN: null-ptr-deref Read in kvm_arch_check_processor_compat From: syzbot To: bp@alien8.de, hpa@zytor.com, jmattson@google.com, joro@8bytes.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, mingo@redhat.com, pbonzini@redhat.com, sean.j.christopherson@intel.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, vkuznets@redhat.com, wanpengli@tencent.com, x86@kernel.org Content-Type: text/plain; charset="UTF-8" Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 7ae77150 Merge tag 'powerpc-5.8-1' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=135e7235100000 kernel config: https://syzkaller.appspot.com/x/.config?x=d195fe572fb15312 dashboard link: https://syzkaller.appspot.com/bug?extid=a99874f5323ce6088e53 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14d001be100000 Bisection is inconclusive: the bug happens on the oldest tested release. bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13a8e549100000 final crash: https://syzkaller.appspot.com/x/report.txt?x=1068e549100000 console output: https://syzkaller.appspot.com/x/log.txt?x=17a8e549100000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+a99874f5323ce6088e53@syzkaller.appspotmail.com ================================================================== BUG: KASAN: null-ptr-deref in test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline] BUG: KASAN: null-ptr-deref in kvm_arch_check_processor_compat+0x1f8/0x750 arch/x86/kvm/x86.c:9818 Read of size 8 at addr 0000000000000060 by task syz-executor.2/8085 CPU: 1 PID: 8085 Comm: syz-executor.2 Not tainted 5.7.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 __kasan_report mm/kasan/report.c:517 [inline] kasan_report.cold+0x5/0x37 mm/kasan/report.c:530 check_memory_region_inline mm/kasan/generic.c:186 [inline] check_memory_region+0x141/0x190 mm/kasan/generic.c:192 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline] kvm_arch_check_processor_compat+0x1f8/0x750 arch/x86/kvm/x86.c:9818 ================================================================== Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 8085 Comm: syz-executor.2 Tainted: G B 5.7.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:221 end_report+0x4d/0x53 mm/kasan/report.c:104 __kasan_report mm/kasan/report.c:520 [inline] kasan_report.cold+0xd/0x37 mm/kasan/report.c:530 check_memory_region_inline mm/kasan/generic.c:186 [inline] check_memory_region+0x141/0x190 mm/kasan/generic.c:192 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline] kvm_arch_check_processor_compat+0x1f8/0x750 arch/x86/kvm/x86.c:9818 Shutting down cpus with NMI Kernel Offset: disabled Rebooting in 86400 seconds.. --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches