Received: by 10.223.148.5 with SMTP id 5csp6061622wrq; Wed, 17 Jan 2018 08:53:58 -0800 (PST) X-Google-Smtp-Source: ACJfBovEakTzQ6PmTZTqTapd1E6FcelhRwYs6gpqcsJ9mCnbkFu5SOCrPNOildWvNwYE7hT0ZZbm X-Received: by 10.84.225.134 with SMTP id u6mr13164205plj.390.1516208038426; Wed, 17 Jan 2018 08:53:58 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1516208038; cv=none; d=google.com; s=arc-20160816; b=kQ9fk4rvo/u3DtDRhPgcptNen+tOCyC9VLoN0B+WDR6JP7EorYfTBvARukGqf8YMab rLCqoVnSu6mW5XMgPhlgJJOzAd+HCITNNmSaodMgjHLkIarv60Xk1mgjQn7lpzhbxxYT txNgYhzKhnG/4E60ag+nYTexL4edy3jeqmSAqXIpECVxGdwLtmITiCoeQDDYKcFMfubX gMlxde+8nN/q+T4MX4eORMytB2MpFlr4fDc95b2XhkTAXnSr9Hrkyrm315egnUHSj5SR 2bjqLmjvsOak9DIzOE0JhtX4fhHvfA9bQfMV/+pnnoW28vl/JxaqEBcwkoDdihT/S9bv 5DdQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:cc:to:subject:message-id:date:from :mime-version:arc-authentication-results; bh=tJ2yZ0AUgjATmGKlYbWklbfLeCVPM7WAqnrgDzkEv1I=; b=ftr6mYZsUVNao/sT0T1LhSyOb9WtZ2Mpwtz3IOfPBGFbhB9n4hoZXFkrHctHz0hQS9 bmgQvN3k5B6MF/MooT2X9kjgk3VzXC55OmwdHqPnVOsb2AoeV4ui/8Gm1e9wz1HJUDQ1 utQhlhfno0ekjDaBLghkYkWoeNVeugrvbXFDCaX2D4f61AYPTmwQiFQ5mj+Ro0YkR01o ffCHrJqNU19wC5UJvQpo3hLW5gEdkESRgJqX2Gn4A0T+br7x6n8Ym5bOyxYW1HEVkjAR 3OvmV6dI84yYdFX/nv5CebgAzPgiDxSogbiNYznvnmcUj4/qv/su2ofp2IfxROk9XnhR xqRw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id 68si4827314ple.371.2018.01.17.08.53.44; Wed, 17 Jan 2018 08:53:58 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754013AbeAQQxK (ORCPT + 99 others); Wed, 17 Jan 2018 11:53:10 -0500 Received: from outprodmail01.cc.columbia.edu ([128.59.72.39]:54907 "EHLO outprodmail01.cc.columbia.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753853AbeAQQxI (ORCPT ); Wed, 17 Jan 2018 11:53:08 -0500 Received: from hazelnut (hazelnut.cc.columbia.edu [128.59.213.250]) by outprodmail01.cc.columbia.edu (8.14.4/8.14.4) with ESMTP id w0HGqKui056455 for ; Wed, 17 Jan 2018 11:53:08 -0500 Received: from hazelnut (localhost.localdomain [127.0.0.1]) by hazelnut (Postfix) with ESMTP id B119B6D for ; Wed, 17 Jan 2018 11:53:08 -0500 (EST) Received: from sendprodmail04.cc.columbia.edu (sendprodmail04.cc.columbia.edu [128.59.72.16]) by hazelnut (Postfix) with ESMTP id A52FA7E for ; Wed, 17 Jan 2018 11:53:08 -0500 (EST) Received: from mail-wr0-f200.google.com (mail-wr0-f200.google.com [209.85.128.200]) by sendprodmail04.cc.columbia.edu (8.14.4/8.14.4) with ESMTP id w0HGr7Ga020369 (version=TLSv1/SSLv3 cipher=AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 17 Jan 2018 11:53:07 -0500 Received: by mail-wr0-f200.google.com with SMTP id y13so13323812wrb.17 for ; Wed, 17 Jan 2018 08:53:07 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to:cc; bh=tJ2yZ0AUgjATmGKlYbWklbfLeCVPM7WAqnrgDzkEv1I=; b=ZCA195ivfFvfjg+aXns729NPkfQ1tYJCv9JrPCF0AOH85gJ1ggGqwkjkmaNRDi3iBo 8bVyMtWTfR6ZHb07AMxiOmX3K+hTu6U3X639sVYzlNlPD8iFim9u2Yik5JQkkyze3qtX WlDt6GEyIFsksdEgW/58PXJZ9rR7E6Ws628wF8CERY8C733LG8yBNcKUj+d2WuFQNp3T T4Y+28QwDBWvMuz7TcIQD+TFTK8kkPQ0kOU+/gHvwHMcedYA9Z9c4FSkNKrXVn3gj/DY MDm6nQHWc9GEmVBh9ekwP5/BcnOfrxdo7dUwFcoPOv+XUyLDcGuELf0V2Urchn+9vuNu 95dQ== X-Gm-Message-State: AKwxytdFlLNQJ11Oh/cN9z16gYU3yHpHQdY5kTx38EgZXZG/c5konYQp X/kpCmOZVsVmv74B1os6KLpLr+Hi52vykiMwxe5vXWu2VQuIzCOzl+ESTnwu6kXvNk5ENluTelx 2m1v31jRoefTg1bFSeFT+nDL5LAO8N2oCIVpCysIZY74lwn5x X-Received: by 10.80.213.82 with SMTP id f18mr3818611edj.255.1516207986680; Wed, 17 Jan 2018 08:53:06 -0800 (PST) X-Received: by 10.80.213.82 with SMTP id f18mr3818592edj.255.1516207986486; Wed, 17 Jan 2018 08:53:06 -0800 (PST) MIME-Version: 1.0 Received: by 10.80.182.139 with HTTP; Wed, 17 Jan 2018 08:53:06 -0800 (PST) From: Shankara Pailoor Date: Wed, 17 Jan 2018 08:53:06 -0800 Message-ID: Subject: RCU stall in 8250 serial driver Linux 4.15-rc1 To: gregkh@linuxfoundation.org, jslaby@suse.com Cc: LKML , syzkaller , linux-serial@vger.kernel.org Content-Type: text/plain; charset="UTF-8" X-No-Spam-Score: Local X-Scanned-By: MIMEDefang 2.78 on 128.59.72.16 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, Syzkaller found the following rcu stall report in Linux 4.15-rc1: https://pastebin.com/NyZ9JdRv The following C program reproduces it: https://pastebin.com/gqwDWWpA Configs Here: https://pastebin.com/v6M3iKi1 Regards, Shankara