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=-8.4 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL 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 399EDC32751 for ; Wed, 31 Jul 2019 14:46:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1009E20659 for ; Wed, 31 Jul 2019 14:46:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="pjfmT0kN" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730002AbfGaOq3 (ORCPT ); Wed, 31 Jul 2019 10:46:29 -0400 Received: from mail-io1-f66.google.com ([209.85.166.66]:43107 "EHLO mail-io1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729123AbfGaOq3 (ORCPT ); Wed, 31 Jul 2019 10:46:29 -0400 Received: by mail-io1-f66.google.com with SMTP id k20so136799548ios.10 for ; Wed, 31 Jul 2019 07:46:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=OVbM3ywHXnfaXLqBHLumDjTwvKiP2anaixILYvBn/ng=; b=pjfmT0kNj6Uqy/h+8/WX0HU1oAXn2oRKXIdhUHe4IZ2y9tFHrZED/lweo1b/cRpzAu idCTfvQdx0X4j4gAoaTIvdCkse0FKv2ZP/nMGpEvdjB4FCdpbtSCe7YbbbrA7NfG4kgB 6tJs0JHORDFcqF9yUmWvwGlkVZTf7lFPuxi+OM100xLlwRDiOvY1zGtyXxJrNqMVKjTy Sh4mX2HBTdxSw3G64Fi/PnSesG7Yz22B9o3S2QcDXBAfMDAbKi3fjQPg1HKM266NKtz7 DeKvT6dr4cOE1OkPu2qnqj8vl+krkBY8nCeb8pXZk+CMIp6EboJyNNksTUyTgnwSJOU3 d+WA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=OVbM3ywHXnfaXLqBHLumDjTwvKiP2anaixILYvBn/ng=; b=AM9gg8b09Q5cIjzS0owu2W/LrJxb2MjMneL045mTjMQnUTJ169AYCI7VwTp5BDDgMN GG0nCSnm+FCYi7dxGzwpfOREPBAQv9Y5+DEkRfu+h8uQbnDuz7dQP7BXs8V3Wg+XoMfx Fk/VtZ8HMe+6BpDz808s5KeTZjrQ+CM1rDxpTkeWefu235AzvlKimvKAfzEB5MdcN5S5 hkSaAwekXL8H/tet15L9+su/WPPhgyNacjHzqvKNvRuGpG+s1S4PAMX1c7PkMFvwceLX sKcsjFb6REOyobtiogjBsaGBWBxvwE8QtXWr25b79iNRRe7zXzvTy5XEb56Jv/RKGAzz nFrg== X-Gm-Message-State: APjAAAXVzA3xBg+UG3nWdm+Y2IjDIzdYynUAExyGkTyyu1iu1JxwrumQ TStyQvNox9tf1uawPn5As8OY1EmRvdPxerzhei9/uA== X-Google-Smtp-Source: APXvYqxKYf0QIDVpvcoBYAjITw+kwzxhvEER2l33yz1T4bLAIqIHkcdAsy647W1OXK8CZ55vRav7zMW5fa7eD+/0o2c= X-Received: by 2002:a6b:4101:: with SMTP id n1mr87736036ioa.138.1564584387977; Wed, 31 Jul 2019 07:46:27 -0700 (PDT) MIME-Version: 1.0 References: <0000000000004c2416058c594b30@google.com> <24282.1562074644@warthog.procyon.org.uk> <20330.1564583454@warthog.procyon.org.uk> In-Reply-To: <20330.1564583454@warthog.procyon.org.uk> From: Dmitry Vyukov Date: Wed, 31 Jul 2019 16:46:15 +0200 Message-ID: Subject: Re: kernel BUG at net/rxrpc/local_object.c:LINE! To: David Howells Cc: syzbot , Eric Biggers , David Miller , linux-afs@lists.infradead.org, LKML , netdev , syzkaller-bugs Content-Type: text/plain; charset="UTF-8" Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Wed, Jul 31, 2019 at 4:30 PM David Howells wrote: > > Dmitry Vyukov wrote: > > > Re bisection, I don't know if there are some more subtle things as > > play (you are in the better position to judge that), but bisection log > > looks good, it tracked the target crash throughout and wasn't > > distracted by any unrelated bugs, etc. So I don't see any obvious > > reasons to not trust it. > > Can you turn on: > > echo 1 > /sys/kernel/debug/tracing/events/rxrpc/rxrpc_local/enable > > and capture the trace log at the point it crashes? 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.