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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_2 autolearn=no 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 BA826C3A59E for ; Tue, 20 Aug 2019 14:25:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 990C4205ED for ; Tue, 20 Aug 2019 14:25:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730130AbfHTOZd (ORCPT ); Tue, 20 Aug 2019 10:25:33 -0400 Received: from mx2.suse.de ([195.135.220.15]:49306 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729137AbfHTOZd (ORCPT ); Tue, 20 Aug 2019 10:25:33 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id D7C78AAB0; Tue, 20 Aug 2019 14:25:31 +0000 (UTC) Message-ID: <1566311130.11678.21.camel@suse.com> Subject: Re: WARNING in kmem_cache_alloc_trace From: Oliver Neukum To: syzbot , andreyknvl@google.com, syzkaller-bugs@googlegroups.com, balbi@kernel.org, gregkh@linuxfoundation.org, chunfeng.yun@mediatek.com, stern@rowland.harvard.edu, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org Date: Tue, 20 Aug 2019 16:25:30 +0200 In-Reply-To: <000000000000d61cbf05908c97e2@google.com> References: <000000000000d61cbf05908c97e2@google.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.26.6 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Am Dienstag, den 20.08.2019, 06:40 -0700 schrieb syzbot: > Hello, > > syzbot has tested the proposed patch but the reproducer still triggered > crash: > WARNING in yurex_write/usb_submit_urb It looks to me like we have two issues here. The driver is simply not ready to deal with concurrent writers. Is that one of the test cases? Regards Oliver