From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on gnuweeb.org X-Spam-Level: X-Spam-Status: No, score=-0.0 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_PASS,SPF_SOFTFAIL,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1244BC433F5 for ; Fri, 20 May 2022 12:53:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1349583AbiETMxI (ORCPT ); Fri, 20 May 2022 08:53:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41696 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235951AbiETMxH (ORCPT ); Fri, 20 May 2022 08:53:07 -0400 Received: from mail-pl1-x630.google.com (mail-pl1-x630.google.com [IPv6:2607:f8b0:4864:20::630]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 83D877DE29 for ; Fri, 20 May 2022 05:53:06 -0700 (PDT) Received: by mail-pl1-x630.google.com with SMTP id bh5so7278748plb.6 for ; Fri, 20 May 2022 05:53:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20210112.gappssmtp.com; s=20210112; h=message-id:date:mime-version:user-agent:subject:content-language:to :cc:references:from:in-reply-to:content-transfer-encoding; bh=K48joKWWADzr7Z35QkCVv+Jn/yutrM6gsvgQnkpKmgg=; b=nunV+LdbUf7j720DSbCSghOqk0h+xc/4NNS65gbBL3kzNHxP4rcBJuOI0Fm6k93XMR Zt/SOAvlU791zjrXyYI7u5SRT5mvnnkwwfqwVPPPUehWRgVdGfNucC5jOeT1OyWeWv75 Hs7IPHPKhtUj8ewpZgV8cvgu8L9nXEev/IyjhCYGjBhkUbTLJRO+Q1tYGFfOmiLM+Hft YRT/YgmLj6weisreBPK5SkasAVgDI7vMXvwFDrCxSRsdksTGgU+sQj6lH0ShrHVNxO6q n4zICyhRJZYdtbs4eN6ek8bIPIjZu9FqGfodRtxmqOjiJJhxCGS2L+gFVIJ/c1VGeEbV x3VA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:date:mime-version:user-agent:subject :content-language:to:cc:references:from:in-reply-to :content-transfer-encoding; bh=K48joKWWADzr7Z35QkCVv+Jn/yutrM6gsvgQnkpKmgg=; b=kmb1W9pSn/hbnoaOC07y1dPDTH8D/ynGeXTiMkYYiXqOlzt7DAPKfLVwIBGWHXBxap 8S6KkHWl9Leqwz/PJjIZ+CmkvBAMm55SqzNPbwGWcPRPpMObmu3s7mWL07vmZ8CvXKxd LQ5kloyurfH/UtxFd84KxRmVh3vVEtnCc8RzptL++bQN50aR/tN5AijW5qmNZMaxy8Bw L7ssPz/r7kVOq8V/LgvoGQlmW1ECDB9AJMLuhcliVlY2V6KSKSRinS0kqPPG4hnt6P0z b9HQy01TgNHbovJ1Ya8zCTn/hHov1C2otw//lnmtlvU3ooTjuepeginvBJpA+lDchlFo U+Fg== X-Gm-Message-State: AOAM531m3SFXk9i9dmt8ykEBzYmZAA8HZvky7Q1LSYHjHZqreNgTGFek 9zYflGEf1FFAtwgYWC1dB+LvEEWv45Dwxw== X-Google-Smtp-Source: ABdhPJyQUNHYw3StmP6ROMA2KN4boEIOCXmFcfjjUEFxR1dMLAzShchPWcCuIDfUGlArqKDrHBVuVQ== X-Received: by 2002:a17:90b:1d0c:b0:1dd:220b:bac9 with SMTP id on12-20020a17090b1d0c00b001dd220bbac9mr11603896pjb.36.1653051186006; Fri, 20 May 2022 05:53:06 -0700 (PDT) Received: from [192.168.1.100] ([198.8.77.157]) by smtp.gmail.com with ESMTPSA id w22-20020a1709026f1600b0016189ed82c4sm5543374plk.79.2022.05.20.05.53.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 20 May 2022 05:53:05 -0700 (PDT) Message-ID: Date: Fri, 20 May 2022 06:53:03 -0600 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux aarch64; rv:91.0) Gecko/20100101 Thunderbird/91.8.1 Subject: Re: [syzbot] general protection fault in __io_arm_poll_handler Content-Language: en-US To: Dmitry Vyukov Cc: syzbot , asml.silence@gmail.com, io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, syzkaller References: <000000000000f0da6305cb1feacb@google.com> <15a67989-9ad7-11ef-9472-8e16ca6ec11a@kernel.dk> From: Jens Axboe In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org On 5/20/22 2:41 AM, Dmitry Vyukov wrote: > On Sat, 4 Sept 2021 at 02:49, Jens Axboe wrote: >> >> On 9/3/21 5:47 PM, syzbot wrote: >>> Hello, >>> >>> syzbot has tested the proposed patch and the reproducer did not trigger any issue: >>> >>> Reported-and-tested-by: syzbot+ba74b85fa15fd7a96437@syzkaller.appspotmail.com >>> >>> Tested on: >>> >>> commit: 31efe48e io_uring: fix possible poll event lost in mul.. >>> git tree: git://git.kernel.dk/linux-block for-5.15/io_uring >>> kernel config: https://syzkaller.appspot.com/x/.config?x=914bb805fa8e8da9 >>> dashboard link: https://syzkaller.appspot.com/bug?extid=ba74b85fa15fd7a96437 >>> compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.1 >>> >>> Note: testing is done by a robot and is best-effort only. >> >> Dmitry, I wonder if there's a way to have syzbot know about what it's >> testing and be able to run the pending patches for that tree? I think >> we're up to 4 reports now that are all just fallout from the same bug, >> and where a patch has been queued up for a few days. Since they all look >> different, I can't fault syzbot for thinking they are different, even if >> they have the same root cause. >> >> Any way we can make this situation better? I can't keep replying that we >> should test the current branch, and it'd be a shame to have a ton of >> dupes. > > Hi Jens, > > This somehow fell through the cracks, but better late than never. > > We could set up a syzbot instance for the io-uring tree. > It won't solve the problem directly, but if the branch contains both > new development ("for-next") and fixes, it will have good chances of > discovering issues before they reach mainline and spread to other > trees. > Do you think it's a good idea? Is there a branch that contains new > development and fixes? My for-next stuff is always in linux-next, so I think as long as that is tested, that should be quite fine. It's _usually_ not a problem, it just sometimes happens that a broken patch ends up triggering a bunch of different things. And then we don't get them all attributed in a fix, or perhaps the patch itself is fixed up (or removed) and pushed out, then leaving the syzbot reports in limbo. In short, I don't think we need to do anything special here for now. -- Jens Axboe