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=-5.4 required=3.0 tests=FROM_LOCAL_DIGITS, FROM_LOCAL_HEX,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 C467DC54E8D for ; Tue, 12 May 2020 06:55:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A591820752 for ; Tue, 12 May 2020 06:55:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728952AbgELGzU (ORCPT ); Tue, 12 May 2020 02:55:20 -0400 Received: from mail-io1-f72.google.com ([209.85.166.72]:47567 "EHLO mail-io1-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725823AbgELGzR (ORCPT ); Tue, 12 May 2020 02:55:17 -0400 Received: by mail-io1-f72.google.com with SMTP id v23so11928025ioj.14 for ; Mon, 11 May 2020 23:55:16 -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=nYuxikRQd1y8JjIoZo7imSaZgwUVBRsszkZdjA7ikeA=; b=Uwby7gX1ICqRy1g4Qmgd6cl0Zd4uEEEYPfM/BFaZE+R/VwHsG5ZoMQZQY3oorid1LO mqrkquT5C3icmCQFVKPTcNR57SKVNvhWKPwaviGq8MKEgSrjIcdWel4GqilaiOjgeZ6y fSdeFSDA1LjvicIf1hInzWcWFq/o0AOJMcy0Q5rhpsEkicWzJ+C2XarLABZ8co6N+xM6 xbhKyQpu7uR0fzVW/tFMQ9duJGEtf4ZjbTiTYwj1yaZDnPTay2DQmHHqPw3HsIsm9lQK iRNefjuhtyQVpgCy3RuzFVnACplXOQb8xwDr7IvI3IAwwXdzwklaEkzsljxNYU1n1/Gt Slyg== X-Gm-Message-State: AGi0PuYfZsxjx0108vgOP4RbquMAt+GKssF0MAcWZxEheAiMxJB5QDB/ 1gJe51qz2EOrs/yWGA2fFVtCOXbIAWsLrq+XVW4RR1KXuSW6 X-Google-Smtp-Source: APiQypJTfjl8Mevb0+zyALKxqVwVDOoXBPw6Xzhz5l0uVnLgmpdB6UQxigcW76BTbcAmcXQnzr5NoJqJxwVI8QHzZgBDc31kCc7p MIME-Version: 1.0 X-Received: by 2002:a02:c6c5:: with SMTP id r5mr15913250jan.133.1589266516187; Mon, 11 May 2020 23:55:16 -0700 (PDT) Date: Mon, 11 May 2020 23:55:16 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000026a06e05a56df22f@google.com> Subject: general protection fault in nfsd_reply_cache_free_locked From: syzbot To: bfields@fieldses.org, chuck.lever@oracle.com, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, syzkaller-bugs@googlegroups.com 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: 6e7f2eac Merge tag 'arm64-fixes' of git://git.kernel.org/p.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14567034100000 kernel config: https://syzkaller.appspot.com/x/.config?x=b0212dbee046bc1f dashboard link: https://syzkaller.appspot.com/bug?extid=a29df412692980277f9d compiler: gcc (GCC) 9.0.0 20181231 (experimental) 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+a29df412692980277f9d@syzkaller.appspotmail.com general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 0 PID: 27932 Comm: kworker/u4:4 Not tainted 5.7.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net RIP: 0010:nfsd_reply_cache_free_locked+0x2d/0x380 fs/nfsd/nfscache.c:122 Code: 56 41 55 41 54 49 89 fc 55 48 89 f5 53 48 89 d3 e8 08 c0 2f ff 48 8d 7d 61 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 a7 02 00 00 RSP: 0018:ffffc90008bb7b70 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff888000026000 RCX: dffffc0000000000 RDX: 0000000000000002 RSI: ffffffff82436ea8 RDI: 0000000000000011 RBP: ffffffffffffffb0 R08: ffff888093792400 R09: fffffbfff185cf3e R10: ffffffff8c2e79ef R11: fffffbfff185cf3d R12: ffff888000100000 R13: ffff888000100008 R14: 0000000000000000 R15: ffff888000100000 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2c531000 CR3: 00000000685a2000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: nfsd_reply_cache_shutdown+0x150/0x350 fs/nfsd/nfscache.c:203 nfsd_exit_net+0x189/0x4c0 fs/nfsd/nfsctl.c:1504 ops_exit_list.isra.0+0xa8/0x150 net/core/net_namespace.c:186 cleanup_net+0x511/0xa50 net/core/net_namespace.c:603 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Modules linked in: ---[ end trace 54f06072fc6a1afa ]--- RIP: 0010:nfsd_reply_cache_free_locked+0x2d/0x380 fs/nfsd/nfscache.c:122 Code: 56 41 55 41 54 49 89 fc 55 48 89 f5 53 48 89 d3 e8 08 c0 2f ff 48 8d 7d 61 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 a7 02 00 00 RSP: 0018:ffffc90008bb7b70 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff888000026000 RCX: dffffc0000000000 RDX: 0000000000000002 RSI: ffffffff82436ea8 RDI: 0000000000000011 RBP: ffffffffffffffb0 R08: ffff888093792400 R09: fffffbfff185cf3e R10: ffffffff8c2e79ef R11: fffffbfff185cf3d R12: ffff888000100000 R13: ffff888000100008 R14: 0000000000000000 R15: ffff888000100000 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2c531000 CR3: 0000000094cfb000 CR4: 00000000001426f0 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.