From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-lj1-f179.google.com (mail-lj1-f179.google.com [209.85.208.179]) (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 C454D181 for ; Mon, 31 Oct 2022 08:30:10 +0000 (UTC) Received: by mail-lj1-f179.google.com with SMTP id x21so14450498ljg.10 for ; Mon, 31 Oct 2022 01:30:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=Jn48igS3IBXvOF+EgMV6gXOl/FBAcAGkVdcUR3W/h7c=; b=oc+qA1v+m8ZJGEKPfdZgxx8r7+kVVDbwsn2l62EmRfdtT6mvqr8CYJfYvyq0NbaXMl B0eIbAxgynY84yK2kZkyLsJptyHISCvQo8XkGuEn496nT66DZ+2+YcA1BQxITYO4b5mN bihzbQtVpVoC8JwYrMI3YyXwXkekSwrGTmreYEVgRUCJPYoG7RXvZoFEe2GWSZlr1mJC mqB3ELfLof4NUNO3zzqP6JHV2L36EHEOAkXI7l1F0HgxjodmiU/meSSMWLxR/inkv5Oa a1aw+RS6aW5b7mp9MsIELm72heCAtk9Lj6TU8xbkMnAL2kQyERj1eMTNsONjo+OfVWQt 2Bmg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=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=Jn48igS3IBXvOF+EgMV6gXOl/FBAcAGkVdcUR3W/h7c=; b=TNJn9Z0hu5c+bY+tFhYDpLWJ9MoNJdVesGGjr/XXqOKxGc5WQwbTPkbMhB5qjF12B/ 02W4I32hpdRV/zCeF3ObockMoyMQSPQxusf0ml+YNG3jMULmEemjJKrZIkj7s2uGDdLa yKH7Xgv5cRTkCSxa0gescRmt/fve68JeUkToDwXtRhGIXLtUi7bfaXYMybDPMJaT8RSp CPCPCZeoJGKV3xZECa7/4GIARpfjfHt0lb5GB7+PAe5/OIHtFTg2d+d2CQuHMqB7Yd0j 8AApa7/1k0uSBUaPMF+QGLoIV40AuW2MY2wZCtOsgqzEuY+maf0ZGdObBUG2NkiDM52Y O7sg== X-Gm-Message-State: ACrzQf0KReFpI47b7StFcCIo3H8aT6hpa7wXxaFrleWJBBIxArbHt5Oz XRwnFKUaXOrGB8ddiTPRj6rxJqXWUDHdWWieYrE= X-Google-Smtp-Source: AMsMyM6zU8ESu6fo+vQq0wRW7221W7DcZYCUYmGGOlmdlzdT+GsowkFTOswei+XFKlJtDFMsVhTSPe5TcjMwVRmzoaA= X-Received: by 2002:a2e:a4a9:0:b0:277:2544:f945 with SMTP id g9-20020a2ea4a9000000b002772544f945mr5119228ljm.39.1667205008477; Mon, 31 Oct 2022 01:30:08 -0700 (PDT) Precedence: bulk X-Mailing-List: regressions@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <87h6zklb6n.wl-tiwai@suse.de> In-Reply-To: <87h6zklb6n.wl-tiwai@suse.de> From: Steven Noonan Date: Mon, 31 Oct 2022 01:29:56 -0700 Message-ID: Subject: Re: [REGRESSION 6.0.x / 6.1.x] NULL dereferencing at tracing To: Takashi Iwai Cc: Steven Rostedt , regressions@lists.linux.dev, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" I hit this same NULL pointer dereference on one of my systems, trying to boot with either 6.0.6 or 5.15.76. Unfortunately it happens fairly early in boot during network initialization, which makes it frustrating to recover from. On Mon, Oct 31, 2022 at 12:24 AM Takashi Iwai wrote: > > Hi Steven, > > we've got a bug report indicating the NULL dereference at the recent > tracing changes, showing at the start of KDE. The details including > the dmesg are found at: > https://bugzilla.opensuse.org/show_bug.cgi?id=1204705 > > It was reported at first for 6.0.3, and confirmed that the problem > persists with 6.1-rc, too. > > The culprit seems to be the commit > f3ddb74ad0790030c9592229fb14d8c451f4e9a8 > tracing: Wake up ring buffer waiters on closing of the file > and reverting it seems fixing the problem. > > Could you take a look? > > > thanks, > > Takashi