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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 69124C19F2B for ; Tue, 2 Aug 2022 05:05:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235103AbiHBFFC (ORCPT ); Tue, 2 Aug 2022 01:05:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33598 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231599AbiHBFFA (ORCPT ); Tue, 2 Aug 2022 01:05:00 -0400 Received: from mail-ed1-x52f.google.com (mail-ed1-x52f.google.com [IPv6:2a00:1450:4864:20::52f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C8E8E65BF; Mon, 1 Aug 2022 22:04:59 -0700 (PDT) Received: by mail-ed1-x52f.google.com with SMTP id s11so4762950edd.13; Mon, 01 Aug 2022 22:04:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=Y82hfpg6T6DnHBl0eGr+nPNpL/5TjcB5vAqOZt23ee4=; b=cTCUmjrx0Eu58mdFSzfFDVH3IjrBV1VlqQcaOIquZeMs82x+1IxhEVa9V7ehFhIz8K 4SfimlfHVSG9PSrEzbXp2v4BiOF+cCXAVHkfj5K3W0EG2J4DC3zT5Qqr+4P4v5Y6r0OI 38cZdyfQDb3n7xT1pFMJnO22whKoVGwsjoWV+8JcRFtB4QK67aRL86yH5CYwxIDI2+eT uTRPKQ0+VziAdhYpFB85+zfi5SwZxYYcMqjq/R/miMD0L1PyZFFKyC7nTdqWEAQ78TY0 DUb2875Yyi50e3l/RSt5mFhz9ch3dMLV/8rUdkP6DkSMHAvU37tbZ0qUiugqmb+74+nt M3aQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=Y82hfpg6T6DnHBl0eGr+nPNpL/5TjcB5vAqOZt23ee4=; b=Kl5zkxso/hBv4YvJhAXJ3lwUpg1G4t2mHbW/vjWtNrwl0ZLFYeYjfMqoE8GKihKu7F pwlW/CsqsS/bFKYBrdID27BQPLSlJfBZqpUizWiO2QgJcu9igOCa6DU78/aEmromQvxv lNOs6aNt4IwL8v0RdfSMS3E6pp8TLcDze+TAu3Lk8p0BE4XwIxgA54lWmdt5Z3IZDEy8 qlSnSJe0W3bZE+BOaHLfubalv9Ckyle08im2p5aJMmJl9uA+Lq40b3wNdyVZsOs+puhC xoXLRL5ydokWcQlfvsT/LJHdh1DyS/SaBGOzh7v38q8HK0xF98CPQFx4JGKCoJH5+u2I N+8A== X-Gm-Message-State: AJIora9KOPI5Or4D0tCzWc+guCUqKxKXK6/ohwZRIK93rLk22TrTLZ9v ZWJwHQdAKiJTqueb4rK7+6gRt8HHUDCe/dUhcqg= X-Google-Smtp-Source: AGRyM1vEdWhU3Y1tZm3JHUujUTcNSEx040urz+bsEtVG7v5vNfBj3rpIAAS6UDPDvetxnRNI6x/Lc0NgdGcsFuBtBsM= X-Received: by 2002:a05:6402:4024:b0:43d:2067:f068 with SMTP id d36-20020a056402402400b0043d2067f068mr18000013eda.258.1659416698232; Mon, 01 Aug 2022 22:04:58 -0700 (PDT) MIME-Version: 1.0 References: <20220731095307.GA12211@1wt.eu> In-Reply-To: <20220731095307.GA12211@1wt.eu> From: Dipanjan Das Date: Mon, 1 Aug 2022 22:04:46 -0700 Message-ID: Subject: Re: INFO: task hung in __floppy_read_block_0 To: Willy Tarreau Cc: Lukas Bulwahn , Denis Efremov , Jens Axboe , linux-block@vger.kernel.org, Linux Kernel Mailing List , syzkaller , fleischermarius@googlemail.com, its.priyanka.bose@gmail.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Jul 31, 2022 at 2:53 AM Willy Tarreau wrote: > > Thus I'm a bit confused about what to look for. It's very likely that > there are still bugs left in this driver, but trying to identify them > and to validate a fix will be difficult if they cannot be reproduced. > Maybe they only happen under emulation due to timing issues. > > As such, any hint about the exact setup and how long to wait to get > the error would be much appreciated. We can confirm that we were able to trigger the issue on the latest 5.19 (commit: 3d7cb6b04c3f3115719235cc6866b10326de34cd) with the C-repro within a VM. We use this: https://syzkaller.appspot.com/text?tag=KernelConfig&x=cd73026ceaed1402 config to build the kernel. The issue triggers after around 143 seconds. For all the five times we tried, we were able to reproduce the issue deterministically every time. Please let us know if you need any other information. -- Thanks and Regards, Dipanjan