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=-0.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS 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 C38A3C47256 for ; Fri, 1 May 2020 21:54:55 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 7D2F6216FD for ; Fri, 1 May 2020 21:54:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="IwDhz8qF" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7D2F6216FD Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 14CC68E0005; Fri, 1 May 2020 17:54:55 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 0FDF88E0001; Fri, 1 May 2020 17:54:55 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id F2E258E0005; Fri, 1 May 2020 17:54:54 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0139.hostedemail.com [216.40.44.139]) by kanga.kvack.org (Postfix) with ESMTP id D92018E0001 for ; Fri, 1 May 2020 17:54:54 -0400 (EDT) Received: from smtpin09.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 9D574180AD806 for ; Fri, 1 May 2020 21:54:54 +0000 (UTC) X-FDA: 76769505708.09.steel34_dbc61cb8dc31 X-HE-Tag: steel34_dbc61cb8dc31 X-Filterd-Recvd-Size: 3223 Received: from us-smtp-1.mimecast.com (us-smtp-delivery-1.mimecast.com [207.211.31.120]) by imf14.hostedemail.com (Postfix) with ESMTP for ; Fri, 1 May 2020 21:54:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1588370093; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Vqe/h5bIx8Xwds5+Doaeo5m4e7NAmlXMvCMv86v34rc=; b=IwDhz8qFqZ3P8Ga2hQugrbtYcW+J78pfO9cvPbMOkT2rAZinNz/4xtIRQ0uvgOVXePAlsA Wdc9HX4DAUvE1T2BQqcWU6n0nH3f9fywqbfq2ZQPg09/bLMNlYOESYitMALTiCT3167M/z YpXBLjdbXE42RAXUEiHQJcqqrIGHsnU= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-443-Qwf3zUiVOfaeAGW9G-6Xxg-1; Fri, 01 May 2020 17:54:49 -0400 X-MC-Unique: Qwf3zUiVOfaeAGW9G-6Xxg-1 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 mimecast-mx01.redhat.com (Postfix) with ESMTPS id F0EA545F; Fri, 1 May 2020 21:54:46 +0000 (UTC) Received: from optiplex-lnx (unknown [10.3.128.26]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 8BDE36A954; Fri, 1 May 2020 21:54:44 +0000 (UTC) Date: Fri, 1 May 2020 17:54:41 -0400 From: Rafael Aquini To: Qian Cai Cc: Linux-MM , linux-kernel@vger.kernel.org, akpm@linux-foundation.org, iamjoonsoo.kim@lge.com, rientjes@google.com, penberg@kernel.org, cl@linux.com Subject: Re: [PATCH] mm: slub: add panic_on_error to the debug facilities Message-ID: <20200501215441.GE27720@optiplex-lnx> References: <20200501211540.71216-1-aquini@redhat.com> <21CF143C-B9D1-4D3F-A875-370924265593@lca.pw> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <21CF143C-B9D1-4D3F-A875-370924265593@lca.pw> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000002, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, May 01, 2020 at 05:29:19PM -0400, Qian Cai wrote: > > > > On May 1, 2020, at 5:15 PM, Rafael Aquini wrote: > > > > Sometimes it is desirable to override SLUB's debug facilities > > default behavior upon stumbling on a cache or object error > > and just stop the execution in order to grab a coredump, at > > the error-spotting time, instead of trying to fix the issue > > and report in an attempt to keep the system rolling. > > > > This patch introduces a new debug flag SLAB_PANIC_ON_ERROR, > > along with its related SLUB-machinery, in order to extend > > current slub_debug facilites and provide the aforementioned > > behavior override. > > Instead of adding those things everywhere. How about adding something like panic_on_taint? Then, you could write specific taint flags you are interested in to that file because slab_bug() will taint it TAINT_BAD_PAGE. > It seems like a good idea which also would required "adding things" elsewhere, but doesn't look mutually exclusive with the approach here. Thanks -- Rafael