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=-5.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 170A9C433FF for ; Tue, 13 Aug 2019 14:23:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E4C3620679 for ; Tue, 13 Aug 2019 14:23:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729573AbfHMOXD convert rfc822-to-8bit (ORCPT ); Tue, 13 Aug 2019 10:23:03 -0400 Received: from mx1.redhat.com ([209.132.183.28]:33934 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729151AbfHMOXD (ORCPT ); Tue, 13 Aug 2019 10:23:03 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 1133C3064FD4; Tue, 13 Aug 2019 14:23:03 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-120-255.rdu2.redhat.com [10.10.120.255]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4365360852; Tue, 13 Aug 2019 14:23:01 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: References: <0000000000004c2416058c594b30@google.com> <24282.1562074644@warthog.procyon.org.uk> <20330.1564583454@warthog.procyon.org.uk> <22318.1564586386@warthog.procyon.org.uk> To: Dmitry Vyukov Cc: dhowells@redhat.com, syzbot , Eric Biggers , David Miller , linux-afs@lists.infradead.org, LKML , netdev , syzkaller-bugs Subject: Re: kernel BUG at net/rxrpc/local_object.c:LINE! MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <3134.1565706180.1@warthog.procyon.org.uk> Content-Transfer-Encoding: 8BIT Date: Tue, 13 Aug 2019 15:23:00 +0100 Message-ID: <3135.1565706180@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.45]); Tue, 13 Aug 2019 14:23:03 +0000 (UTC) Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Dmitry Vyukov wrote: > > > Please send a patch for testing that enables this tracing > > > unconditionally. This should have the same effect. There is no way to > > > hook into a middle of the automated process and arbitrary tune things. > > > > I don't know how to do that off hand. Do you have an example? > > Few messages above I asked it to test: > https://groups.google.com/d/msg/syzkaller-bugs/gEnZkmEWf1s/r2_X_KVQAQAJ > > Basically, git repo + branch + patch. Here are the docs: > https://github.com/google/syzkaller/blob/master/docs/syzbot.md#testing-patches I meant that I don't know how to turn a tracepoint on from inside the kernel. David