Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754571AbdGJQFY (ORCPT ); Mon, 10 Jul 2017 12:05:24 -0400 Received: from mail-it0-f51.google.com ([209.85.214.51]:35504 "EHLO mail-it0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754405AbdGJQFX (ORCPT ); Mon, 10 Jul 2017 12:05:23 -0400 Subject: Re: block: hung task writing to device To: "Levin, Alexander (Sasha Levin)" , "linux-block@vger.kernel.org" , "linux-kernel@vger.kernel.org" References: <20170708190730.avwa2urwjuvohpgg@sasha-lappy> From: Jens Axboe Message-ID: <92fb7af1-d128-ffe0-bc5c-b7a5ead77b1e@kernel.dk> Date: Mon, 10 Jul 2017 10:05:15 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: <20170708190730.avwa2urwjuvohpgg@sasha-lappy> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 566 Lines: 17 On 07/08/2017 01:06 PM, Levin, Alexander (Sasha Levin) wrote: > Hi all, > > syzkaller seems to be hitting a lockup with the reproducer below: > > INFO: task syzkaller490361:8788 blocked for more than 120 seconds. > Not tainted 4.12.0-next-20170706+ #186 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > syzkaller490361 D18312 8788 5843 0x00080004 > Call Trace: I've run this for about an hour now, with mq-deadline and a regular SATA drive, and it's still chugging along. I need to know more about your setup. -- Jens Axboe