From nobody Sun Feb 8 23:48:05 2026 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 DECD3C38142 for ; Wed, 18 Jan 2023 02:09:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229733AbjARCJN (ORCPT ); Tue, 17 Jan 2023 21:09:13 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45172 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229561AbjARCIf (ORCPT ); Tue, 17 Jan 2023 21:08:35 -0500 Received: from SHSQR01.spreadtrum.com (unknown [222.66.158.135]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 73C3A42DDD for ; Tue, 17 Jan 2023 18:08:07 -0800 (PST) Received: from SHSend.spreadtrum.com (bjmbx01.spreadtrum.com [10.0.64.7]) by SHSQR01.spreadtrum.com with ESMTP id 30I27vdA018004; Wed, 18 Jan 2023 10:07:57 +0800 (+08) (envelope-from zhaoyang.huang@unisoc.com) Received: from bj03382pcu.spreadtrum.com (10.0.74.65) by BJMBX01.spreadtrum.com (10.0.64.7) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Wed, 18 Jan 2023 10:07:52 +0800 From: "zhaoyang.huang" To: Andrew Morton , Catalin Marinas , Vlastimil Babka , "Nathan Chancellor" , Peter Zijlstra , Zhaoyang Huang , , , , Mirsad Todorovac Subject: [PATCHv3] mm: use stack_depot_early_init for kmemleak Date: Wed, 18 Jan 2023 10:07:35 +0800 Message-ID: <1674007655-23016-1-git-send-email-zhaoyang.huang@unisoc.com> X-Mailer: git-send-email 1.9.1 MIME-Version: 1.0 X-Originating-IP: [10.0.74.65] X-ClientProxiedBy: SHCAS03.spreadtrum.com (10.0.1.207) To BJMBX01.spreadtrum.com (10.0.64.7) X-MAIL: SHSQR01.spreadtrum.com 30I27vdA018004 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Zhaoyang Huang Mirsad report bellow error which caused by stack_depot_init failed in kvcal= loc. Solve this by having stackdepot use stack_depot_early_init. On 1/4/23 17:08, Mirsad Goran Todorovac wrote: I hate to bring bad news again, but there seems to be a problem with the ou= tput of /sys/kernel/debug/kmemleak: [root@pc-mtodorov ~]# cat /sys/kernel/debug/kmemleak unreferenced object 0xffff951c118568b0 (size 16): comm "kworker/u12:2", pid 56, jiffies 4294893952 (age 4356.548s) hex dump (first 16 bytes): 6d 65 6d 73 74 69 63 6b 30 00 00 00 00 00 00 00 memstick0....... backtrace: [root@pc-mtodorov ~]# Apparently, backtrace of called functions on the stack is no longer printed= with the list of memory leaks. This appeared on Lenovo desktop 10TX000VCR, with AlmaLinux 8.7 and BIOS ver= sion M22KT49A (11/10/2022) and 6.2-rc1 and 6.2-rc2 builds. This worked on 6.1 with the same CONFIG_KMEMLEAK=3Dy and MGLRU enabled on a= vanilla mainstream kernel from Mr. Torvalds' tree. I don't know if this is deliberate feature for som= e reason or a bug. Please find attached the config, lshw and kmemleak output. reported-by: Mirsad Todorovac suggested-by: Vlastimil Babka Signed-off-by: Zhaoyang Huang --- v2: use stack_depot_want_early_init instead of CONFIG_STACKDEPOT_ALWAYS_INIT v3: have the Kconfig changes commited in another patch --- Signed-off-by: Zhaoyang Huang --- mm/kmemleak.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/mm/kmemleak.c b/mm/kmemleak.c index 762b91f..ddc1ddf 100644 --- a/mm/kmemleak.c +++ b/mm/kmemleak.c @@ -2070,8 +2070,10 @@ static int __init kmemleak_boot_config(char *str) return -EINVAL; if (strcmp(str, "off") =3D=3D 0) kmemleak_disable(); - else if (strcmp(str, "on") =3D=3D 0) + else if (strcmp(str, "on") =3D=3D 0) { kmemleak_skip_disable =3D 1; + stack_depot_want_early_init(); + } else return -EINVAL; return 0; --=20 1.9.1