From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5917A2FE589; Mon, 22 Dec 2025 17:24:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=216.40.44.16 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766424293; cv=none; b=nWkACNLVCFjFRLRjS67aiHNtO6+k/7FrRV2nj0/sw/8e3Y4VsIyWzi49WvS6kZFDrjZN8ioMnggQRZvvpxQk/rd4Uu/qSUF2J7DA0mhu/8wWw44OpCibSc3iuesghLd80fFF9OID69qXwStN8dLCfy4ixdZ+FWwTviXIvJzlbS4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766424293; c=relaxed/simple; bh=Lv1tifWSSAu97WJmWQDHDADcPhJWieLqs0WZxgRO3xI=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=F7e/641ELGnMlEh440eKp2/lUdqQqyaR1+LPHo5kEMmdXxMr7pxOynZ64YzeMU21NtIR3OvaB+kLZK0NEoLAKdsk+6xC7HmJlqkS7VIfCdRYe9tiZxaDlnLT7S28SPOkwbRISUvqv0XKwxSCbaC071Mx5/9XkILueSRxKZp4WEg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=goodmis.org; spf=pass smtp.mailfrom=goodmis.org; arc=none smtp.client-ip=216.40.44.16 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=goodmis.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=goodmis.org Received: from omf16.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay04.hostedemail.com (Postfix) with ESMTP id 5A1A81A026B; Mon, 22 Dec 2025 17:24:43 +0000 (UTC) Received: from [HIDDEN] (Authenticated sender: rostedt@goodmis.org) by omf16.hostedemail.com (Postfix) with ESMTPA id 96E1E2000F; Mon, 22 Dec 2025 17:24:40 +0000 (UTC) Date: Mon, 22 Dec 2025 12:26:28 -0500 From: Steven Rostedt To: Eric Dumazet Cc: Jiayuan Chen , netdev@vger.kernel.org, syzbot+9b35e9bc0951140d13e6@syzkaller.appspotmail.com, "David S. Miller" , David Ahern , Jakub Kicinski , Paolo Abeni , Simon Horman , Sebastian Andrzej Siewior , Clark Williams , linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev Subject: Re: [PATCH net v2] ipv6: fix a BUG in rt6_get_pcpu_route() under PREEMPT_RT Message-ID: <20251222122628.38e9bc89@gandalf.local.home> In-Reply-To: <20251222121639.3953ea08@gandalf.local.home> References: <20251219025140.77695-1-jiayuan.chen@linux.dev> <20251222121639.3953ea08@gandalf.local.home> X-Mailer: Claws Mail 3.20.0git84 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 96E1E2000F X-Stat-Signature: 9i3hpyxor4p4sb7rzgjh6mcpxdefcgga X-Rspamd-Server: rspamout08 X-Session-Marker: 726F737465647440676F6F646D69732E6F7267 X-Session-ID: U2FsdGVkX19qDrVqYSa0iEs6XcszNqiIWakCG1vHKeY= X-HE-Tag: 1766424280-938894 X-HE-Meta: U2FsdGVkX1//i2lGNRX/XANnKqiYMMBVA+zbELtJSIzCY62u8nwLmyETToVIkmc4gsZJAIsI+/u2ueorbztRO2o5Mx5QlY9pMXYQ+HVhaRB7C6OIm4HTWOsUa5YbFwLfBEqJhWKZEhc/2uR+UTJJbsN6P4VMb1bqJI4Y/sMrza+/ZP9VTfJK4zu+wzPH59Vq0wFlXZ9HQRbFiWsutRxU2oRlr/14ZafD65Aq3FrboudtKyG0sSVqiQu7NXOikLctZUHdMyBKfRgoIjsyx0eb3WheytPbZmiJvi8xt92NoAEmEASR5larMP5vdqhGcIZgO0YfPIkW06kGHttULL+3wAL26qJupM6ujNEVRyUcAxB53Ow8o73PEi++8tVM9kVKRlvFLRcelNGTWIMsfxEOrybq8ucQ7q8EoyvLsgiq7w0RTFdjQp13WyAZk6HPmMXUcsSzMuWHA4Yv5y4M9+cVCg== On Mon, 22 Dec 2025 12:16:39 -0500 Steven Rostedt wrote: > On Mon, 22 Dec 2025 09:50:58 +0100 > Eric Dumazet wrote: > > > > Link: https://syzkaller.appspot.com/bug?extid=9b35e9bc0951140d13e6 > > > Fixes: 951f788a80ff ("ipv6: fix a BUG in rt6_get_pcpu_route()") > > > > I would rather find when PREEMPT_RT was added/enabled, there is no > > point blaming such an old commit > > which was correct at the time, and forcing pointless backports to old > > linux kernels. > > Ack! Fixes: d2d6422f8bd1 ("x86: Allow to enable PREEMPT_RT.") That was the first commit to enable PREEMPT_RT on any architecture (just happened to be x86). -- Steve