From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751503AbdKUVOa (ORCPT ); Tue, 21 Nov 2017 16:14:30 -0500 Received: from mga09.intel.com ([134.134.136.24]:52553 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751263AbdKUVO3 (ORCPT ); Tue, 21 Nov 2017 16:14:29 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.44,432,1505804400"; d="scan'208";a="10453037" Message-ID: <1511298864.25007.370.camel@linux.intel.com> Subject: Re: [serial8250_interrupt] RIP: 0010:arch_local_irq_restore+0x2/0x8 From: Andy Shevchenko To: Fengguang Wu , linux-serial@vger.kernel.org Cc: Greg Kroah-Hartman , Jiri Slaby , Linus Torvalds , Sean Young , Matthias Brugger , linux-kernel@vger.kernel.org, lkp@01.org Date: Tue, 21 Nov 2017 23:14:24 +0200 In-Reply-To: <1511275154.25007.349.camel@linux.intel.com> References: <20171121090529.p3bcdz5y5bs5mqk2@wfg-t540p.sh.intel.com> <20171121123357.bw5raz3vqkob2vgz@wfg-t540p.sh.intel.com> <20171121133120.43fe5ak2gct56nmp@wfg-t540p.sh.intel.com> <1511275154.25007.349.camel@linux.intel.com> Organization: Intel Finland Oy Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.26.2-1 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2017-11-21 at 16:39 +0200, Andy Shevchenko wrote: > On Tue, 2017-11-21 at 21:31 +0800, Fengguang Wu wrote: > > On Tue, Nov 21, 2017 at 08:33:57PM +0800, Fengguang Wu wrote: >>> FYI this happens in mainline kernel 4.14.0-02748-gabc36be. > > > It shows up since v4.13 . > > > > Sorry it actually also shows up in 4.10: >> [ 21.020567] irq 3: nobody cared (try booting with the "irqpoll" > > option) > > [ 21.039171] uart_start+0x73/0xe0 > > [ 21.044977] vfs_write+0xc8/0x1e0 > > [ 21.054662] Disabling IRQ #3 Another question who and why initiates a write to ttyS1 (console seems on ttyS0). -- Andy Shevchenko Intel Finland Oy