From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-qt1-f179.google.com (mail-qt1-f179.google.com [209.85.160.179]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5611C111AE for ; Thu, 15 Jun 2023 13:01:23 +0000 (UTC) Received: by mail-qt1-f179.google.com with SMTP id d75a77b69052e-3f86a7f3a65so29435361cf.0 for ; Thu, 15 Jun 2023 06:01:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1686834082; x=1689426082; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=LzzubgBVt/J0nhYq2hKWgLyD/ISUfZBJNfYWWUP1FQE=; b=NVkPW3sSJz8Ti0OLHUwsQMACcGifVQZarMa9af3J9v7HIiAdbCMuVVow5wmCtXlltO MW9V93ISS7DGuX0zeRDHvXLB+RrMDvnq1nIBIGKEA3CR8vDqwE4m9UFzGOMb25HnmLWF xHXjGUqFgfzH6OKyyNbsMduwcpodYZJse5Bon6Ypg6UB2rZLWlOkB6j+MLevlZFD/67K PmK0k6Lh1NCThLxwsg93FCoju/8JN3DPGWLjzfnvSCag9q1tMxzgDI2V98RTME/KI+rG K6WEUD1A9z4YdgkIqntvhwx7E9LCOp/tDgTROuBi/jZegsbsXBO0GO7clHuIrLsrNEHd NLCQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1686834082; x=1689426082; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=LzzubgBVt/J0nhYq2hKWgLyD/ISUfZBJNfYWWUP1FQE=; b=Oinkji4xAGShcMaAyn6WbuQGArwad1cJ1p885DhUjfQs0K40wPFTb6UEK28U0dCGrE 7O15g9D2m9BITpQLFkByqhdoDw/lFFm+kHcs6iZiHnvxGScoXTP+Co5kk35wFzogY2+T bqwFOKAYSBOQpO/L2NPQjYY2YW9HVFNE/2PBS/vXdkv6eij6RWVC+jtz51B5xToF3VuM bfDVtiO29Sf8nJ6v6fee31mTBjU95FHv7la3W15WF1v8v4HT/TcyzV+wpmpSHe0dbLNg Q1q2yeHe4d6yMn2NBMYydFrYpyZ299Kv2290CuGDublaN/nPtFOmJntWXA160uLSFHgB TaZg== X-Gm-Message-State: AC+VfDwVaesRJrJAiLHi9ekT5rqH2YhnWHNi6ol0zm7full5OifZ0ocx YCY3lPlXAzwiN8Khiw3qrlX5MPy3Epoql2oiDVDd7Qn9 X-Google-Smtp-Source: ACHHUZ6ylbf4BRxvTAx0QGSZ0SFgescSs+d4NQ+GPGVU5MPdz5hjOXzBWLTzX6pUzQ995la95FLpjPN00bR8sR+CfdM= X-Received: by 2002:a05:622a:54b:b0:3ed:86f6:6ecf with SMTP id m11-20020a05622a054b00b003ed86f66ecfmr6189795qtx.46.1686834081704; Thu, 15 Jun 2023 06:01:21 -0700 (PDT) Precedence: bulk X-Mailing-List: regressions@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <2C5E9725-F152-4D2E-882E-CF92A35481BF@hammerspace.com> <7ba38377-7992-7f0f-d905-cceb42510f39@linaro.org> <51430925-8046-7066-84ed-2ff0db835347@linaro.org> <2add1769-1458-b185-bc78-6d573f61b6fc@linaro.org> <32530c36-91d0-d351-0689-aed6a0975a4b@linaro.org> <2f285607-cbf9-6abc-f436-edb6e9a3938b@linaro.org> <4fe39d77-eb7c-a578-aefa-45b76e2247c2@linaro.org> <86d8e252-975f-5d48-4567-0911d5ef9a44@linaro.org> In-Reply-To: From: Anna Schumaker Date: Thu, 15 Jun 2023 09:01:05 -0400 Message-ID: Subject: Re: Regression: NULL pointer dereference after NFS_V4_2_READ_PLUS (commit 7fd461c47) To: Krzysztof Kozlowski Cc: Trond Myklebust , Anna Schumaker , linux-nfs , Linux Kernel Mailing List , "regressions@lists.linux.dev" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, Jun 15, 2023 at 4:55=E2=80=AFAM Krzysztof Kozlowski wrote: > > On 15/06/2023 10:52, Krzysztof Kozlowski wrote: > > On 14/06/2023 22:55, Anna Schumaker wrote: > >>>>> Still null ptr (built on 420b2d4 with your patch): > >>>> > >>>> We're through the merge window and at rc1 now, so I can spend more > >>>> time scratching my head over your bug again. We've come up with a > >>>> patch (attached) that adds a bunch of printks to show us what the > >>>> kernel thinks is going on. Do you mind trying it out and letting us > >>>> know what gets printed out? You'll need to make sure > >>>> CONFIG_NFS_V4_2_READ_PLUS is enabled when compiling the kernel. > >>> > >>> The patch does not apply. I tried: v6.4-rc1, v6.4-rc5, next-20230609. > >> > >> Can you try the attached patch on top of my 3-patch series from the > >> other day, and let me know what gets printed out? It adds a bunch of > >> printk()s at strategic points to print out what is going on with the > >> xdr scratch buffer since it's suddenly a bad memory address after > >> working for a bit on your machine. > >> > > > > Here you have entire log - attached (113 kB, I hope goes past mailing > > lists/spam filters). > > As expected this bounced from the mailing lists, but I hope you got it. > If not, let me know. I did still receive it. Thanks! Anna > > Best regards, > Krzysztof >