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,URIBL_BLOCKED autolearn=ham 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 DAB58C433DF for ; Mon, 22 Jun 2020 05:27:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BE54B252C3 for ; Mon, 22 Jun 2020 05:27:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731173AbgFVF1O (ORCPT ); Mon, 22 Jun 2020 01:27:14 -0400 Received: from mail-il1-f197.google.com ([209.85.166.197]:33004 "EHLO mail-il1-f197.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726604AbgFVF1N (ORCPT ); Mon, 22 Jun 2020 01:27:13 -0400 Received: by mail-il1-f197.google.com with SMTP id c11so11245682ilq.0 for ; Sun, 21 Jun 2020 22:27:11 -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=WAbF95MgN8ZYZsWID6ErjvPvo/yEVx8gXF6X3UgNnwE=; b=WaNktqqpTTOibeWHUpR8y0YC1RXvzJb3JO4fngJ2JmZpepKn/x7DphTW6PVZJkFdxU zxhCsur5qXmggDG/F2jqDb1b50nvBs3MoBNhoW6gDyGHrpjnKzJCoOkZQfSP8aM/9tL3 u2BEpSMxBzi/lsQPRtSvUeo43W4qwku1zeTqvDQulN65+W/lmlQxUwLhGKEIZTmZ0r2k qI430Gp1/prcJhf0flgS2UgXkWG4ayC4n3Il/DR10cc5b4yNcKNOKpVVOY+fO2kuDU8u 4kkoaZqiaQdBazvVns0QqMmLUfuDX5PaPb6Vto1sj0ZZqJsDgoFbn/ZOTzaf2qfeUDwC VKtw== X-Gm-Message-State: AOAM530Hw94q87e4YpjN31OKt91B4Tz1UVyUPt1sMbNHR0ZzIlFnTrsQ OOe00bNnV3WSBfst2mZrR1I+Xx+Vy3X+54SLTxNNVOD9Y5Gs X-Google-Smtp-Source: ABdhPJx1d2x8MplJ7qZiLPqN7qsCGSk24mbh9hQ0jkWLY6ngXy5/k2A7sFw9yePX9F81jEWL281xJItlf+5A1VMl9Sqtp1btximk MIME-Version: 1.0 X-Received: by 2002:a05:6638:d42:: with SMTP id d2mr16942376jak.9.1592803631022; Sun, 21 Jun 2020 22:27:11 -0700 (PDT) Date: Sun, 21 Jun 2020 22:27:11 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000009fc59f05a8a57efd@google.com> Subject: KASAN: null-ptr-deref Write in kvm_vcpu_halt 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: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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=17d9bfa9100000 kernel config: https://syzkaller.appspot.com/x/.config?x=be4578b3f1083656 dashboard link: https://syzkaller.appspot.com/bug?extid=76004d8cdf5443dcd8e7 compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+76004d8cdf5443dcd8e7@syzkaller.appspotmail.com ================================================================== BUG: KASAN: null-ptr-deref in kvm_vcpu_halt+0xea/0x110 arch/x86/kvm/x86.c:7546 Write of size 4 at addr 0000000000000000 by task syz-executor.0/11111 CPU: 1 PID: 11111 Comm: syz-executor.0 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+0x1e9/0x30e lib/dump_stack.c:118 __kasan_report mm/kasan/report.c:517 [inline] kasan_report+0x151/0x1d0 mm/kasan/report.c:530 kvm_vcpu_halt+0xea/0x110 arch/x86/kvm/x86.c:7546 ================================================================== Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 11111 Comm: syz-executor.0 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+0x1e9/0x30e lib/dump_stack.c:118 panic+0x264/0x7a0 kernel/panic.c:221 end_report mm/kasan/report.c:104 [inline] __kasan_report mm/kasan/report.c:520 [inline] kasan_report+0x1c9/0x1d0 mm/kasan/report.c:530 kvm_vcpu_halt+0xea/0x110 arch/x86/kvm/x86.c:7546 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.