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_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 605FBC43381 for ; Thu, 21 Feb 2019 04:14:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 333182070B for ; Thu, 21 Feb 2019 04:14:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727075AbfBUEOF (ORCPT ); Wed, 20 Feb 2019 23:14:05 -0500 Received: from mail-it1-f197.google.com ([209.85.166.197]:38059 "EHLO mail-it1-f197.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726389AbfBUEOE (ORCPT ); Wed, 20 Feb 2019 23:14:04 -0500 Received: by mail-it1-f197.google.com with SMTP id r136so14428937ith.3 for ; Wed, 20 Feb 2019 20:14:04 -0800 (PST) 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:in-reply-to:message-id:subject :from:to; bh=cbeSaS3LGncwdEsYg96KFBhBt+013N7ayfIpbGeViB4=; b=huGcs1/ulHFZ22oXJzFsCrLj9EpkURs9BJZeN0P6cn7vk/1F/gUSFCDXws3Gyj9k8b 8089vl7/qGMRvNbWRKo4j4W2GVdIatkQBQ7AaJaO6Sz18mXoSq7s/EbyYjO4e2MyPy9r TUXyzzLhmBRgXy9TNMtXzzKcGXNajKJ3XWiT+1IYd3y8iWf3b5TwbzW+FnXKm1C/x/Jv sFzsJOMomM1m1K0x6mYDdGIEvAFXHRZ1lPjFdDBX7rzymlKoUMZLUfxgB4iI3E4nbmMj 1WpYOVH8LHUcS5EbbKS85nyfvHOvAg2UbFA+85WaVwdIHJbpiCLOf5uoRFWv4hunHv18 c2mg== X-Gm-Message-State: AHQUAuaDXF/d8xOABjnMKIDyDGx0jKX3V9l4oGEbEqYFIr7VUmN5uGzd i1qJLr9PoRZyKve2CCfeLaX4XUCubqug0CycygC+UoRggE9A X-Google-Smtp-Source: AHgI3IayrBpgpnZiaPg5aH/emjGsbj7sYOGnMtzI0dHO0i7INDrkoYIeYFh702jaMuc+mEtWLNXMl9I55tRU330ZORVqh5MNVNgu MIME-Version: 1.0 X-Received: by 2002:a6b:5b0b:: with SMTP id v11mr27284545ioh.19.1550722443336; Wed, 20 Feb 2019 20:14:03 -0800 (PST) Date: Wed, 20 Feb 2019 20:14:03 -0800 In-Reply-To: <0000000000007e10c50580aa7684@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000006164d205825fb497@google.com> Subject: Re: general protection fault in __dentry_path From: syzbot To: kvm@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, penguin-kernel@I-love.SAKURA.ne.jp, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org syzbot has found a reproducer for the following crash on: HEAD commit: 2137397c92ae Merge tag 'sound-5.0' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1270bf78c00000 kernel config: https://syzkaller.appspot.com/x/.config?x=7132344728e7ec3f dashboard link: https://syzkaller.appspot.com/bug?extid=7857962b4d45e602b8ad compiler: gcc (GCC) 9.0.0 20181231 (experimental) userspace arch: i386 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=150bee14c00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12f401d4c00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+7857962b4d45e602b8ad@syzkaller.appspotmail.com kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 12576 Comm: syz-executor696 Not tainted 5.0.0-rc7+ #81 kobject: 'kvm' (00000000985ff3e6): kobject_uevent_env Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__dentry_path+0x49e/0x7c0 fs/d_path.c:344 Code: 89 fc 41 83 e4 01 44 89 e6 e8 fe e4 b2 ff 45 84 e4 0f 85 04 02 00 00 e8 b0 e3 b2 ff 48 8b 85 18 ff ff ff 44 89 bd 40 ff ff ff <80> 38 00 0f 85 f9 02 00 00 48 8b 85 38 ff ff ff 41 83 e7 01 44 89 kobject: 'kvm' (00000000985ff3e6): fill_kobj_path: path = '/devices/virtual/misc/kvm' RSP: 0018:ffff888096127c58 EFLAGS: 00010293 RAX: dffffc0000000005 RBX: 0000000000000000 RCX: ffffffff81bcfdc2 RDX: 0000000000000000 RSI: ffffffff81bcfdd0 RDI: 0000000000000001 RBP: ffff888096127d48 R08: ffff88809b17c540 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff888096127d20 R14: ffff888092473afe R15: 0000000000014e78 FS: 0000000000000000(0000) GS:ffff8880ae800000(0063) knlGS:00000000f7fe4b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000080fb028 CR3: 000000009de68000 CR4: 00000000001426f0 kobject: 'kvm' (00000000985ff3e6): kobject_uevent_env Call Trace: kobject: 'kvm' (00000000985ff3e6): fill_kobj_path: path = '/devices/virtual/misc/kvm' dentry_path_raw+0x26/0x30 fs/d_path.c:371 kvm_uevent_notify_change.part.0+0x213/0x440 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4051 kvm_uevent_notify_change arch/x86/kvm/../../../virt/kvm/kvm_main.c:4018 [inline] kvm_dev_ioctl_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:3356 [inline] kvm_dev_ioctl+0x1132/0x1750 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3378 __do_compat_sys_ioctl fs/compat_ioctl.c:1052 [inline] __se_compat_sys_ioctl fs/compat_ioctl.c:998 [inline] __ia32_compat_sys_ioctl+0x197/0x620 fs/compat_ioctl.c:998 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x281/0xc98 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7fe8869 Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f7fe41fc EFLAGS: 00000293 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000000ae01 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00000000003d0f00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 4fe494385b47fe74 ]--- kobject: 'kvm' (00000000985ff3e6): kobject_uevent_env RIP: 0010:__dentry_path+0x49e/0x7c0 fs/d_path.c:344 Code: 89 fc 41 83 e4 01 44 89 e6 e8 fe e4 b2 ff 45 84 e4 0f 85 04 02 00 00 e8 b0 e3 b2 ff 48 8b 85 18 ff ff ff 44 89 bd 40 ff ff ff <80> 38 00 0f 85 f9 02 00 00 48 8b 85 38 ff ff ff 41 83 e7 01 44 89 RSP: 0018:ffff888096127c58 EFLAGS: 00010293 RAX: dffffc0000000005 RBX: 0000000000000000 RCX: ffffffff81bcfdc2 RDX: 0000000000000000 RSI: ffffffff81bcfdd0 RDI: 0000000000000001 RBP: ffff888096127d48 R08: ffff88809b17c540 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff888096127d20 R14: ffff888092473afe R15: 0000000000014e78 kobject: 'kvm' (00000000985ff3e6): fill_kobj_path: path = '/devices/virtual/misc/kvm' FS: 0000000000000000(0000) GS:ffff8880ae800000(0063) knlGS:00000000f7fe4b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000080fb038 CR3: 000000009de68000 CR4: 00000000001426f0