From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2E9B6C43381 for ; Sun, 17 Feb 2019 19:14:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0CD8620818 for ; Sun, 17 Feb 2019 19:14:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726279AbfBQTOA (ORCPT ); Sun, 17 Feb 2019 14:14:00 -0500 Received: from icebox.esperi.org.uk ([81.187.191.129]:47430 "EHLO mail.esperi.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725798AbfBQTOA (ORCPT ); Sun, 17 Feb 2019 14:14:00 -0500 Received: from loom (nix@sidle.srvr.nix [192.168.14.8]) by mail.esperi.org.uk (8.15.2/8.15.2) with ESMTP id x1HJD3U6014430; Sun, 17 Feb 2019 19:13:03 GMT From: Nix To: Greg KH Cc: johan@kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: 4.20.7: pl2303 not working (post-4.19 regression) (limited info so far, not yet bisected) References: <87o97bu2bt.fsf@esperi.org.uk> <20190216194758.GA10756@kroah.com> Emacs: a real time environment for simulating molasses-based life forms. Date: Sun, 17 Feb 2019 19:13:52 +0000 In-Reply-To: <20190216194758.GA10756@kroah.com> (Greg KH's message of "Sat, 16 Feb 2019 20:47:58 +0100") Message-ID: <877edytehb.fsf@esperi.org.uk> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1.50 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-DCC-wuwien-Metrics: loom 1290; Body=4 Fuz1=4 Fuz2=4 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 16 Feb 2019, Greg KH told this: > On Sat, Feb 16, 2019 at 04:26:30PM +0000, Nix wrote: >> So I just tried to connect up to my ancient Soekris firewall's serial >> console to try to bisect a problem where it stopped booting in 4.20, and >> found I couldn't. >> >> minicom says: >> >> minicom: cannot open /dev/ttyUSB0: Input/output error >> >> and in the dmesg we see >> >> [705576.028170] pl2303 ttyUSB0: failed to submit interrupt urb: -28 >> >> Booting to 4.19, everything works fine. (A random GalliumOS Chromebook [...] > > bisection would be great, thanks! Rrrg. This is going to be harder than I thought. Rebooting, everything works fine! So this is something that kicks in after something less than eight days uptime, consistently on every box I own, but is fine on reboot. I'm still fairly sure this is a regression -- my machines are often up for a lot longer than that and I've never seen this before I upgraded to 4.20.x -- but I don't think I'm going to identify it by mindless bisection. I might have to actually *think* about it.