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=-5.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 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 1EC99C76188 for ; Mon, 22 Jul 2019 05:24:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id ECCB021E70 for ; Mon, 22 Jul 2019 05:24:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727164AbfGVFYj (ORCPT ); Mon, 22 Jul 2019 01:24:39 -0400 Received: from mx1.redhat.com ([209.132.183.28]:39372 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725773AbfGVFYj (ORCPT ); Mon, 22 Jul 2019 01:24:39 -0400 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 145078535C; Mon, 22 Jul 2019 05:24:39 +0000 (UTC) Received: from [10.72.12.30] (ovpn-12-30.pek2.redhat.com [10.72.12.30]) by smtp.corp.redhat.com (Postfix) with ESMTP id C6EBC1001DE1; Mon, 22 Jul 2019 05:24:28 +0000 (UTC) Subject: Re: WARNING in __mmdrop To: "Michael S. Tsirkin" , syzbot Cc: aarcange@redhat.com, akpm@linux-foundation.org, christian@brauner.io, davem@davemloft.net, ebiederm@xmission.com, elena.reshetova@intel.com, guro@fb.com, hch@infradead.org, james.bottomley@hansenpartnership.com, jglisse@redhat.com, keescook@chromium.org, ldv@altlinux.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-parisc@vger.kernel.org, luto@amacapital.net, mhocko@suse.com, mingo@kernel.org, namit@vmware.com, peterz@infradead.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk, wad@chromium.org References: <0000000000008dd6bb058e006938@google.com> <000000000000964b0d058e1a0483@google.com> <20190721044615-mutt-send-email-mst@kernel.org> <20190721081447-mutt-send-email-mst@kernel.org> From: Jason Wang Message-ID: <85dd00e2-37a6-72b7-5d5a-8bf46a3526cf@redhat.com> Date: Mon, 22 Jul 2019 13:24:24 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20190721081447-mutt-send-email-mst@kernel.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Mon, 22 Jul 2019 05:24:39 +0000 (UTC) Sender: linux-parisc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org On 2019/7/21 下午8:18, Michael S. Tsirkin wrote: > On Sun, Jul 21, 2019 at 06:02:52AM -0400, Michael S. Tsirkin wrote: >> On Sat, Jul 20, 2019 at 03:08:00AM -0700, syzbot wrote: >>> syzbot has bisected this bug to: >>> >>> commit 7f466032dc9e5a61217f22ea34b2df932786bbfc >>> Author: Jason Wang >>> Date: Fri May 24 08:12:18 2019 +0000 >>> >>> vhost: access vq metadata through kernel virtual address >>> >>> bisection log:https://syzkaller.appspot.com/x/bisect.txt?x=149a8a20600000 >>> start commit: 6d21a41b Add linux-next specific files for 20190718 >>> git tree: linux-next >>> final crash:https://syzkaller.appspot.com/x/report.txt?x=169a8a20600000 >>> console output:https://syzkaller.appspot.com/x/log.txt?x=129a8a20600000 >>> kernel config:https://syzkaller.appspot.com/x/.config?x=3430a151e1452331 >>> dashboard link:https://syzkaller.appspot.com/bug?extid=e58112d71f77113ddb7b >>> syz repro:https://syzkaller.appspot.com/x/repro.syz?x=10139e68600000 >>> >>> Reported-by:syzbot+e58112d71f77113ddb7b@syzkaller.appspotmail.com >>> Fixes: 7f466032dc9e ("vhost: access vq metadata through kernel virtual >>> address") >>> >>> For information about bisection process see:https://goo.gl/tpsmEJ#bisection >> OK I poked at this for a bit, I see several things that >> we need to fix, though I'm not yet sure it's the reason for >> the failures: >> >> >> 1. mmu_notifier_register shouldn't be called from vhost_vring_set_num_addr >> That's just a bad hack, in particular I don't think device >> mutex is taken and so poking at two VQs will corrupt >> memory. >> So what to do? How about a per vq notifier? >> Of course we also have synchronize_rcu >> in the notifier which is slow and is now going to be called twice. >> I think call_rcu would be more appropriate here. >> We then need rcu_barrier on module unload. >> OTOH if we make pages linear with map then we are good >> with kfree_rcu which is even nicer. >> >> 2. Doesn't map leak after vhost_map_unprefetch? >> And why does it poke at contents of the map? >> No one should use it right? >> >> 3. notifier unregister happens last in vhost_dev_cleanup, >> but register happens first. This looks wrong to me. >> >> 4. OK so we use the invalidate count to try and detect that >> some invalidate is in progress. >> I am not 100% sure why do we care. >> Assuming we do, uaddr can change between start and end >> and then the counter can get negative, or generally >> out of sync. >> >> So what to do about all this? >> I am inclined to say let's just drop the uaddr optimization >> for now. E.g. kvm invalidates unconditionally. >> 3 should be fixed independently. > Above implements this but is only build-tested. > Jason, pls take a look. If you like the approach feel > free to take it from here. > > One thing the below does not have is any kind of rate-limiting. > Given it's so easy to restart I'm thinking it makes sense > to add a generic infrastructure for this. > Can be a separate patch I guess. I don't get why must use kfree_rcu() instead of synchronize_rcu() here. > > Signed-off-by: Michael S. Tsirkin Let me try to figure out the root cause then decide whether or not to go for this way. Thanks 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=-5.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 4C494C76196 for ; Mon, 22 Jul 2019 05:24:43 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 24C9921E70 for ; Mon, 22 Jul 2019 05:24:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="mqzluoCv" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 24C9921E70 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender:Content-Type: Content-Transfer-Encoding:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:To:Subject:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=SkXEzfhKdaG7qWFQdj1WV+5Ro5VTt2hfFBwAyCHAa4U=; b=mqzluoCvS+riWDGChYX8UOBRr 3g7wurZP3A81VyVI75abWY3/drU+68sGK+z+WtO+OraFknuXjGjaV0g5wxTRxLgWDCU/sL7X/gV/9 SWo751lw4JFtf9MBcws+YzeYsscmuT/fCb8kHiO+ALOfhAoXllHiBt9FsVn6nU8ySu7YfggJ/kPIb mOlxfSCOiY2gNJ7ZYG602mT/N/wWclmGVAAKVaOCkz+SHK5HcGp05nV9RwhWUJxxT09qkLTTTqG/y 7zxFvXkdv9JvLCBeSkMZU0db2DMtzoOUqG9BBbXwlOmFVfQM1vcmgDibqFZztdg/HmUVQRxFPsQVH MHxQzuCWA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hpQoU-0001FF-KZ; Mon, 22 Jul 2019 05:24:42 +0000 Received: from mx1.redhat.com ([209.132.183.28]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hpQoR-0001Eu-I8 for linux-arm-kernel@lists.infradead.org; Mon, 22 Jul 2019 05:24:41 +0000 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 145078535C; Mon, 22 Jul 2019 05:24:39 +0000 (UTC) Received: from [10.72.12.30] (ovpn-12-30.pek2.redhat.com [10.72.12.30]) by smtp.corp.redhat.com (Postfix) with ESMTP id C6EBC1001DE1; Mon, 22 Jul 2019 05:24:28 +0000 (UTC) Subject: Re: WARNING in __mmdrop To: "Michael S. Tsirkin" , syzbot References: <0000000000008dd6bb058e006938@google.com> <000000000000964b0d058e1a0483@google.com> <20190721044615-mutt-send-email-mst@kernel.org> <20190721081447-mutt-send-email-mst@kernel.org> From: Jason Wang Message-ID: <85dd00e2-37a6-72b7-5d5a-8bf46a3526cf@redhat.com> Date: Mon, 22 Jul 2019 13:24:24 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20190721081447-mutt-send-email-mst@kernel.org> Content-Language: en-US X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Mon, 22 Jul 2019 05:24:39 +0000 (UTC) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190721_222439_639622_B5174EF2 X-CRM114-Status: GOOD ( 21.71 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mhocko@suse.com, peterz@infradead.org, ldv@altlinux.org, james.bottomley@hansenpartnership.com, linux-mm@kvack.org, namit@vmware.com, mingo@kernel.org, elena.reshetova@intel.com, aarcange@redhat.com, davem@davemloft.net, hch@infradead.org, christian@brauner.io, keescook@chromium.org, syzkaller-bugs@googlegroups.com, jglisse@redhat.com, viro@zeniv.linux.org.uk, linux-arm-kernel@lists.infradead.org, wad@chromium.org, linux-parisc@vger.kernel.org, linux-kernel@vger.kernel.org, luto@amacapital.net, ebiederm@xmission.com, akpm@linux-foundation.org, guro@fb.com Content-Transfer-Encoding: base64 Content-Type: text/plain; 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