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=-0.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 61FCDCA9EB5 for ; Mon, 21 Oct 2019 05:25:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3BFF62084B for ; Mon, 21 Oct 2019 05:25:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726836AbfJUFZI (ORCPT ); Mon, 21 Oct 2019 01:25:08 -0400 Received: from mail-io1-f69.google.com ([209.85.166.69]:56917 "EHLO mail-io1-f69.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725765AbfJUFZH (ORCPT ); Mon, 21 Oct 2019 01:25:07 -0400 Received: by mail-io1-f69.google.com with SMTP id a22so16235543ioq.23 for ; Sun, 20 Oct 2019 22:25:07 -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=BJjOacao/xSZdJkfKNvfgayBr+tvt4yWLfw3O1pfZnM=; b=cO6ZAtVQJijyhnrDixOBgc/3+LhEudVJoK5vXisWJUNpXeyK6xlfF+B971363bCzWl HNVT6VHXm8yS+JlkZ0DVyS1k77AKN7yVO32GIw4b/dLvcWLXLCd8a/PGsojWfkYKJ+W/ DxivsO2EgLm56VWBqMK5IEg+HyQd7m3acI9HhHFj/c3FyFe0DtYf7+nfjbSTEmhKkrOG U1aGt5LP3zkOIig8Q6DcWCJNn+YlWhHzjlX+YpMSJGpZ9ZQGyTDII70kQVuI/4XU0xeP XxzMSDBICNHWSCtrD2Ml70bhyEKKkKXatLi51ZCVT5sEt6jqYnmEjSGS5XZAp+x/6Mq1 LHHA== X-Gm-Message-State: APjAAAXVY9/TuLM61HUu36l4Fqi/jpHvBWcEyoQqwS/zr5lYrOhlww2E VaaMgzA2YPzCUtOwhEbtA2HRrGgsENme7S+sJYv8TUMATErK X-Google-Smtp-Source: APXvYqzqO8EInoc9fWb4rurG8YxnJy3l3A6MVsxjqKwXTNpiPU1L2sykAO54wZ2xzCt0jBw+JBC9wkXL9dB1Pb4RJtHdkcoWhZm4 MIME-Version: 1.0 X-Received: by 2002:a92:9957:: with SMTP id p84mr3872177ili.290.1571635506211; Sun, 20 Oct 2019 22:25:06 -0700 (PDT) Date: Sun, 20 Oct 2019 22:25:06 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000107499059564e831@google.com> Subject: general protection fault in fire_user_return_notifiers From: syzbot To: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de 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 Hello, syzbot found the following crash on: HEAD commit: eda57a0e Merge branch 'akpm' (patches from Andrew) git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17310520e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=966954bb171a60e7 dashboard link: https://syzkaller.appspot.com/bug?extid=529818c5c7cdf607bf0e compiler: clang version 9.0.0 (/home/glider/llvm/clang 80fee25776c2fb61e74c1ecb1a523375c2500b69) 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+529818c5c7cdf607bf0e@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: 1 PID: 7781 Comm: syz-executor.2 Not tainted 5.4.0-rc2+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:fire_user_return_notifiers+0x90/0x110 kernel/user-return-notifier.c:42 Code: 00 48 8b 1b 48 85 db 74 06 48 83 c3 f8 75 10 e8 96 e2 e3 ff eb 54 0f 1f 40 00 e8 8b e2 e3 ff 48 8d 7b 08 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 74 05 e8 b4 1b 1d 00 4c 8b 73 08 48 89 d8 48 c1 e8 RSP: 0018:ffff888068db7e38 EFLAGS: 00010a02 RAX: 1bd5a00000000020 RBX: dead0000000000f8 RCX: ffff888068dac0c0 RDX: 0000000000000000 RSI: 0023001000000000 RDI: dead000000000100 RBP: ffff888068db7e50 R08: ffffffff8109b34e R09: ffffed100d1b5819 R10: ffffed100d1b5819 R11: 0000000000000000 R12: 0000000000000800 R13: dffffc0000000000 R14: dead000000000100 R15: dffffc0000000000 FS: 00000000024a9940(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000068d86000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: exit_to_usermode_loop arch/x86/entry/common.c:168 [inline] prepare_exit_to_usermode+0x3fd/0x580 arch/x86/entry/common.c:194 syscall_return_slowpath+0x113/0x4a0 arch/x86/entry/common.c:274 do_syscall_64+0x11f/0x1c0 arch/x86/entry/common.c:300 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457f00 Code: c0 5b 5d c3 66 0f 1f 44 00 00 8b 04 24 48 83 c4 18 5b 5d c3 66 0f 1f 44 00 00 83 3d 51 e8 61 00 00 75 14 b8 23 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 24 d3 fb ff c3 48 83 ec 08 e8 ea 46 00 00 RSP: 002b:00007fff163eec28 EFLAGS: 00000246 ORIG_RAX: 0000000000000023 RAX: 0000000000000000 RBX: 000000000007cbd9 RCX: 0000000000457f00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007fff163eec30 RBP: 0000000000000a99 R08: 0000000000000001 R09: 00000000024a9940 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000d R13: 00007fff163eec80 R14: 000000000007c8a4 R15: 00007fff163eec90 Modules linked in: ---[ end trace ff1f073ed00222a2 ]--- RIP: 0010:fire_user_return_notifiers+0x90/0x110 kernel/user-return-notifier.c:42 Code: 00 48 8b 1b 48 85 db 74 06 48 83 c3 f8 75 10 e8 96 e2 e3 ff eb 54 0f 1f 40 00 e8 8b e2 e3 ff 48 8d 7b 08 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 74 05 e8 b4 1b 1d 00 4c 8b 73 08 48 89 d8 48 c1 e8 RSP: 0018:ffff888068db7e38 EFLAGS: 00010a02 RAX: 1bd5a00000000020 RBX: dead0000000000f8 RCX: ffff888068dac0c0 RDX: 0000000000000000 RSI: 0023001000000000 RDI: dead000000000100 RBP: ffff888068db7e50 R08: ffffffff8109b34e R09: ffffed100d1b5819 R10: ffffed100d1b5819 R11: 0000000000000000 R12: 0000000000000800 R13: dffffc0000000000 R14: dead000000000100 R15: dffffc0000000000 FS: 00000000024a9940(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000068d86000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- 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.