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=-11.0 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,GB_FAKE_RF_SHORT,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 5F0A2C48BDF for ; Tue, 15 Jun 2021 19:52:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 390A461246 for ; Tue, 15 Jun 2021 19:52:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230377AbhFOTyJ (ORCPT ); Tue, 15 Jun 2021 15:54:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56752 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229749AbhFOTyI (ORCPT ); Tue, 15 Jun 2021 15:54:08 -0400 Received: from fieldses.org (fieldses.org [IPv6:2600:3c00:e000:2f7::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 839B1C061574; Tue, 15 Jun 2021 12:52:03 -0700 (PDT) Received: by fieldses.org (Postfix, from userid 2815) id 60B1D620D; Tue, 15 Jun 2021 15:52:00 -0400 (EDT) DKIM-Filter: OpenDKIM Filter v2.11.0 fieldses.org 60B1D620D DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fieldses.org; s=default; t=1623786720; bh=oM0LZltQSkc1niBCAeKehrloS9a/z0+/caFSXoWiLTc=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=DjpmFJ+vgnlPBEHHCIphRFx/JfeIpIj7sjCxXfBU42Eq91TwJ3ZTpHpn9ggq17qAj wSgo5xANP5mGtWCzYfxJbqTO1FZPuwcR6O1ip15ZW83GZj0xn/L7CGhsQxVV6QGDT8 1+FPLXgjSJCMGYFu/8aIG3JKQ28FjG78Xbw2CVS0= Date: Tue, 15 Jun 2021 15:52:00 -0400 From: "J. Bruce Fields" To: syzbot Cc: chuck.lever@oracle.com, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] general protection fault in nfsd_reply_cache_free_locked (2) Message-ID: <20210615195200.GE11877@fieldses.org> References: <000000000000a6561705c42681d8@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <000000000000a6561705c42681d8@google.com> User-Agent: Mutt/1.5.21 (2010-09-15) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This isn't the first report: https://syzkaller.appspot.com/bug?extid=a29df412692980277f9d but I'm not managing yet to see why it happens.... --b. On Sun, Jun 06, 2021 at 10:42:26PM -0700, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 231bc539 Merge branch 'for-linus' of git://git.kernel.org/.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=101f596bd00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=8a9e9956ca52a5f6 > dashboard link: https://syzkaller.appspot.com/bug?extid=314d9a0380418b51606b > > Unfortunately, I don't have any reproducer for this issue yet. > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+314d9a0380418b51606b@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: 25304 Comm: kworker/u4:12 Not tainted 5.13.0-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+0x31/0x3b0 fs/nfsd/nfscache.c:123 > Code: 54 49 89 fc 55 48 89 f5 53 48 89 d3 48 83 ec 08 e8 94 f5 1c 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 c3 02 00 00 > RSP: 0018:ffffc90017a07b68 EFLAGS: 00010202 > RAX: dffffc0000000000 RBX: ffff888017997000 RCX: 0000000000000000 > RDX: 0000000000000002 RSI: ffffffff8257e6ec RDI: 0000000000000011 > RBP: ffffffffffffffb0 R08: 0000000000000800 R09: ffffffff902278af > R10: ffffffff8257f56e R11: 0000000000084087 R12: ffff888000118680 > R13: 0000000000018680 R14: ffffed10000230d1 R15: ffff888000118680 > FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007ffe0630ed17 CR3: 0000000017232000 CR4: 00000000001526f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > nfsd_reply_cache_shutdown+0x153/0x2d0 fs/nfsd/nfscache.c:222 > nfsd_exit_net+0x15f/0x490 fs/nfsd/nfsctl.c:1503 > ops_exit_list+0xb0/0x160 net/core/net_namespace.c:175 > cleanup_net+0x4ea/0xb10 net/core/net_namespace.c:595 > process_one_work+0x98d/0x1600 kernel/workqueue.c:2276 > worker_thread+0x64c/0x1120 kernel/workqueue.c:2422 > kthread+0x3b1/0x4a0 kernel/kthread.c:313 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 > Modules linked in: > ---[ end trace 0af87ae802e1324a ]--- > RIP: 0010:nfsd_reply_cache_free_locked+0x31/0x3b0 fs/nfsd/nfscache.c:123 > Code: 54 49 89 fc 55 48 89 f5 53 48 89 d3 48 83 ec 08 e8 94 f5 1c 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 c3 02 00 00 > RSP: 0018:ffffc90017a07b68 EFLAGS: 00010202 > RAX: dffffc0000000000 RBX: ffff888017997000 RCX: 0000000000000000 > RDX: 0000000000000002 RSI: ffffffff8257e6ec RDI: 0000000000000011 > RBP: ffffffffffffffb0 R08: 0000000000000800 R09: ffffffff902278af > R10: ffffffff8257f56e R11: 0000000000084087 R12: ffff888000118680 > R13: 0000000000018680 R14: ffffed10000230d1 R15: ffff888000118680 > FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00005618fcbf1160 CR3: 000000001518e000 CR4: 00000000001526f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > > --- > This report 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 issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.