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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0A1EFEB64DA for ; Thu, 20 Jul 2023 23:40:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229765AbjGTXkI (ORCPT ); Thu, 20 Jul 2023 19:40:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48120 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229668AbjGTXkG (ORCPT ); Thu, 20 Jul 2023 19:40:06 -0400 Received: from mailgw.gate-on.net (auth.gate-on.net [IPv6:2001:278:1033:4::74:21]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4B698272C for ; Thu, 20 Jul 2023 16:40:04 -0700 (PDT) Received: from vega.pgw.jp (unknown [49.135.109.134]) by mailgw.gate-on.net (Postfix) with ESMTP id B4DD0802A3; Fri, 21 Jul 2023 08:39:58 +0900 (JST) Received: from localhost (vega.pgw.jp [10.5.0.30]) by vega.pgw.jp (Postfix) with SMTP id BF312A53D; Fri, 21 Jul 2023 08:39:55 +0900 (JST) From: Content-Type: text/plain; charset=ISO-2022-JP To: rostedt@goodmis.org Cc: regressions@lists.linux.dev, bagasdotme@gmail.com, alexander.deucher@amd.com, christian.koenig@amd.com, Xinhui.Pan@amd.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, kkabe@vega.pgw.jp Subject: Re: radeon.ko/i586: BUG: kernel NULL pointer dereference,address:00000004 In-Reply-To: Your message of "Mon, 17 Jul 2023 11:36:23 -0400". <20230717113623.41878887@gandalf.local.home> X-Mailer: mnews [version 1.22PL5] 2002-11-27(Wed) Date: Fri, 21 Jul 2023 08:39:55 +0900 Message-ID: <230721083955.M0102626@vega.pgw.jp> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org rostedt@goodmis.org sed in <20230717113623.41878887@gandalf.local.home> >> On Fri, 14 Jul 2023 14:34:04 +0900 >> wrote: >> >> > Patch in >> > https://bugzilla.kernel.org/show_bug.cgi?id=217669#c4 >> > fixed the problem in freedesktop.org kernel 5.18.0-rc2 . >> > This may explain that in kernel.org tree, the said commit is in kernel-5.19. >> >> You mean the patch that adds: >> >> #if defined(FTRACE_MCOUNT_MAX_OFFSET) && (FTRACE_MCOUNT_MAX_OFFSET) >> >> ? >> >> Nothing should be setting FTRACE_MCOUNT_MAX_OFFSET to anything but non >> zero. But doing a grep, I now see: >> >> # define FTRACE_MCOUNT_MAX_OFFSET ENDBR_INSN_SIZE >> >> Where it breaks that assumption if ENDBR_INSN_SIZE == 0 :-p >> (and that's my code!) >> >> OK, does this fix it? (I haven't tested nor compiled this) >> >> -- Steve >> >> diff --git a/arch/x86/include/asm/ftrace.h b/arch/x86/include/asm/ftrace.h >> index 897cf02c20b1..801f4414da3e 100644 >> --- a/arch/x86/include/asm/ftrace.h >> +++ b/arch/x86/include/asm/ftrace.h >> @@ -13,7 +13,7 @@ >> #ifdef CONFIG_HAVE_FENTRY >> # include >> /* Add offset for endbr64 if IBT enabled */ >> -# define FTRACE_MCOUNT_MAX_OFFSET ENDBR_INSN_SIZE >> +# define FTRACE_MCOUNT_MAX_OFFSET (ENDBR_INSN_SIZE + MCOUNT_INSN_SIZE) >> #endif >> >> #ifdef CONFIG_DYNAMIC_FTRACE >> Unfortunately this patch didn't fix freedesktop.org 5.18.0-rc2 tree. (vblank->worker == NULL check fires otherwise a panic) Applying this to kernel.org 6.4.3 results in totally different error as in https://bugzilla.kernel.org/show_bug.cgi?id=217669#c0 so there may be multiple regressions I'm chasing. -- kabe