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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no 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 D0679C433B4 for ; Wed, 12 May 2021 09:47:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 98721613AA for ; Wed, 12 May 2021 09:47:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230019AbhELJs3 (ORCPT ); Wed, 12 May 2021 05:48:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55088 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230186AbhELJs3 (ORCPT ); Wed, 12 May 2021 05:48:29 -0400 Received: from mail-ej1-x62c.google.com (mail-ej1-x62c.google.com [IPv6:2a00:1450:4864:20::62c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 37CFDC06174A for ; Wed, 12 May 2021 02:47:21 -0700 (PDT) Received: by mail-ej1-x62c.google.com with SMTP id w3so34073186ejc.4 for ; Wed, 12 May 2021 02:47:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=sv961MJyocNObPGcZa967XLagc7KlobuPCBUYNDEQvo=; b=xIOvEfAOy7t8SB+dFMOMRDVmUL/m6ixXM4m6TxkP4uzUmVfp2IIPBPyTl8YrmElxbX QAFyAea8LnhvGo0kdytldq5/dC1fCII0ocXGObB6fXysMIcHLueqcBmWNw9o1aMvMm/S E68bLKHOUj0Geap5G3MlovyTuTCUGcMUs0q8CuxBXH500GD5DPAe8LZguZqhe0ML96CP iiqV3ZrRkA4pAOj/baoMr3DEfD5ZXtSOAtb3loRmRxXDQOPnIrKXXeMUVUBvnXKyRZnX Oc06UhFG1b2CAX9zVCbLC691Iv8Po9CTcrWW+n+lM0f1bqM9/P3HkaTYGRjQEehDPbgj eYKA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=sv961MJyocNObPGcZa967XLagc7KlobuPCBUYNDEQvo=; b=aBujMS3rS1Dz3F0VYi/MqlDAaLknzvMLkxPEzvoCUOxyTiXocVnay4xBau7Sy1cIGI y1/WcJm8ttatJgIt8VfbWX5vFenpkGuKT2JgZe6GbSpThwRPCT4KH60zmt0aCPf52aSk slRpxYmiT4OHrH+96M/R6wZwvGtm+TeJ/SIi3MgSUSO3CaUy7bc3xKAyXkeb3k6M86LA qeG9KFdEFu5tJIhsj5XXtm+EqGvyN6clFoIlI1RJUB+lE90mrST8bhmmJJZdlSrhI3sF FqaPy0r5b2JIOUiw5PfVpNslwKEfkN1oyARuCMJSRx/50mDTwcH4UpDhOVVkY3+ZlGrt Dksw== X-Gm-Message-State: AOAM530WuGA1gwXXq5KC1L0LdngiGSB4hCVda/TgvVVLwk94zAmhV8YY x/cFDp3xJOOBk1L8fl4tNjoVrrZRZqsTF6Yp X-Google-Smtp-Source: ABdhPJyuzUgQJa4i7aUIDYkPuuUXGAkzqLoSi3I21f/iXc8hYGFWTCS2oi1FMNXFSiS1nJC6MOo3+g== X-Received: by 2002:a17:906:d145:: with SMTP id br5mr35836821ejb.452.1620812839886; Wed, 12 May 2021 02:47:19 -0700 (PDT) Received: from [192.168.0.13] ([83.216.184.132]) by smtp.gmail.com with ESMTPSA id d25sm13572340ejd.59.2021.05.12.02.47.18 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 12 May 2021 02:47:19 -0700 (PDT) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) Subject: Re: block, bfq: NULL pointer dereference in bfq_rq_pos_tree_lookup() From: Paolo Valente In-Reply-To: Date: Wed, 12 May 2021 11:49:34 +0200 Cc: lkml , linux-block Content-Transfer-Encoding: quoted-printable Message-Id: References: <8c38408d27f1032f2a664838e523376c5da09a80.camel@gmx.de> <9732EA9F-E15B-48E1-9B92-2D74F75C6331@linaro.org> To: Mike Galbraith X-Mailer: Apple Mail (2.3445.104.11) Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org > Il giorno 8 mag 2021, alle ore 06:49, Mike Galbraith = ha scritto: >=20 > On Mon, 2021-05-03 at 14:41 +0200, Mike Galbraith wrote: >> On Mon, 2021-05-03 at 11:52 +0200, Paolo Valente wrote: >>> Hi Mike, >>> I've waited a little bit before replying, because I've worked on a = dev >>> patch series, for debugging another crash. I'd like to use >>> this series for your failure too, as the OOPS you report >>> unfortunately does not ring any bell :( >>>=20 >>> So, could you please try to apply this patch series? If it doesn't >>> apply, I'll rebase it. >>=20 >> This bug isn't deterministic, but I can wedge your set into my devel >> trees, and see if anything falls out. >=20 > What fell out was not the least bit useful. After days of box working > just fine despite bug being given ample enticement, it didn't take the > bait. I then build master sans patch set, which exploded on its very > first distro build, after which bug (snickered mightily and) went back > to into hiding. >=20 Not easy to debug this way :) At any rate, I've just posted the fix contained in my debug patch = series. Thanks, Paolo > -Mike >=20