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=-0.7 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED 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 42422C433F5 for ; Tue, 4 Sep 2018 21:15:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D6AD0206BA for ; Tue, 4 Sep 2018 21:15:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="jQMT4TmX" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D6AD0206BA Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727154AbeIEBmd (ORCPT ); Tue, 4 Sep 2018 21:42:33 -0400 Received: from mail-pg1-f193.google.com ([209.85.215.193]:40200 "EHLO mail-pg1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726170AbeIEBmc (ORCPT ); Tue, 4 Sep 2018 21:42:32 -0400 Received: by mail-pg1-f193.google.com with SMTP id l63-v6so2269413pga.7 for ; Tue, 04 Sep 2018 14:15:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=Wikch0FHJl2lYkyXSbwjuTBnYhtk7uI/uCyoRvNRvzE=; b=jQMT4TmX5yNCdCPxLmV342eZfkagSEE+HYOg8aWtszjQNc2AZLk/BaufJfBX/9ZiNt 55i09EVwD3b9nDCeYn/Yt3qv//wysUI1q7nmYRVHF8vrjEwgY2DC+YyayT0bqNwPardD eZBxXld+6+cXibE/MiDelK4dnmB6XolOArBjBLUWdeWfyIwzIBPHPC99YWEF9+agO+JK p/mhBhvTrVgFCJb2PNpTGgcrk4kKYHd4dqTOWh23pwZX9zhrBhoXREzh1DNEhpElQIMD hdsgl+jqD52AQthGT228p0/pjgqYsf46H+IIxS906yUPKNK1NmLcJL47uqG0HG/HGjK4 2ezg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=Wikch0FHJl2lYkyXSbwjuTBnYhtk7uI/uCyoRvNRvzE=; b=qLzqcpGG6OQEGyJFEoExXnAYc8snNWPd6ls8UQ4zrPolilpuVfRkFMSOxAm08rrJjk NIi1izUhAWm4vT1SEOZ5llO9KqBj0ssOM48EJcO2swd3uc7drzb2qEs1V8BsO18ILDcE 4f4OdoK12exfBCwcsTo/AIZufWxC4H1sWnvZGGnSsvzMZ4lotgUhE5b9MSR97VbzAulU IvHNsjXo0YkSHIVjgKuXpkqxLcZIajvMkXqdErR5SAwe/w+6/BD2neLD4TfbKAPoaIlW yTRrQIDXt9HFBur/EffkqoKWyOobw2rTe7rOb0CqJLKUT9978L/uunvgXfq9w8EXIB3w OL7A== X-Gm-Message-State: APzg51CP+xwDCnyHVaDzs6edZhYbQSEyUF+nbl4qZVo0NJyuodijLlo1 Ta0x/wm0Q5kpOQ+4LFigiSQ= X-Google-Smtp-Source: ANB0VdY2ZOxhfWHbxDVS0q82Ev6+9qRzqIYMoXJw3udnpYenBU05tg/c1ggTfBeFRFmU9FsycoE07g== X-Received: by 2002:a63:a012:: with SMTP id r18-v6mr10750324pge.166.1536095739105; Tue, 04 Sep 2018 14:15:39 -0700 (PDT) Received: from roar.ozlabs.ibm.com (59-102-81-67.tpgi.com.au. [59.102.81.67]) by smtp.gmail.com with ESMTPSA id m15-v6sm31996441pfj.171.2018.09.04.14.15.36 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 04 Sep 2018 14:15:38 -0700 (PDT) Date: Wed, 5 Sep 2018 07:15:29 +1000 From: Nicholas Piggin To: Jason Gunthorpe Cc: Michael Ellerman , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Leon Romanovsky Subject: Re: Regression from patch 'tty: hvc: hvc_poll() break hv read loop' Message-ID: <20180905071529.3b7a09c4@roar.ozlabs.ibm.com> In-Reply-To: <20180904174808.GS335@mellanox.com> References: <20180904174808.GS335@mellanox.com> X-Mailer: Claws Mail 3.17.0 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 4 Sep 2018 11:48:08 -0600 Jason Gunthorpe wrote: > Hi Nicholas, > > I am testing 4.19-rc2 and I see bad behavior with my qemu hvc0 > console.. > > Running interactive with qemu (qemu-2.11.2-1.fc28) on the console > providing hvc0, using options like: > > -nographic > -chardev stdio,id=stdio,mux=on,signal=off > -mon chardev=stdio > -device isa-serial,chardev=stdio > -device virtio-serial-pci > -device virtconsole,chardev=stdio > > I see the hvc0 console hang regularly, ie doing something like 'up > arrow' in bash causes the hvc0 console to hang. Prior kernels worked > OK. > > Any ideas? I'm not familiar with this code.. Thanks! Yes I have had another report, I'm working on a fix. Sorry it has taken a while and thank you for the report. Thanks, Nick