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 F2114C433FE for ; Mon, 3 Oct 2022 10:48:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229515AbiJCKsk (ORCPT ); Mon, 3 Oct 2022 06:48:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46540 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229568AbiJCKsd (ORCPT ); Mon, 3 Oct 2022 06:48:33 -0400 Received: from mail-pf1-x436.google.com (mail-pf1-x436.google.com [IPv6:2607:f8b0:4864:20::436]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A516E50733; Mon, 3 Oct 2022 03:48:31 -0700 (PDT) Received: by mail-pf1-x436.google.com with SMTP id w2so9896184pfb.0; Mon, 03 Oct 2022 03:48:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=message-id:date:content-id:mime-version:references:in-reply-to:cc :to:subject:from:from:to:cc:subject:date; bh=kQUbyQZ45z3C7K2tcOxsIXOsm6gYJzfQJ0oUyErc9i4=; b=HCBm2L118tNM6BrPO9j7u1/+TlvhP03OqqHvCdI7lKtG4aZxtF0y4YnTfn89KSGBZk T/C7PbBgDDmt1C5gN7xq4m/3WwTyyPe/iUqa6ElaaLN6wmPLARBR9i93GjuM831FwnVX TKIfeVGrMjMqVLn+4f3+G6MGgJgk13u6+Af6xvJph6VTdZuXu61bDxIuyuJ0zlLOBZY7 zQFz84+fYRWZO9Hlg1Ml9k4fJBVupuwdPmn9+9PQHjByPopcZTogONehL90K32UcjMwU JZJNqA7qbImxz5EH34oKxeE5blMAn/BHKo1n9ZB28JZNc505uBaqZ7mzrlmv8NZgARur /GDQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=message-id:date:content-id:mime-version:references:in-reply-to:cc :to:subject:from:x-gm-message-state:from:to:cc:subject:date; bh=kQUbyQZ45z3C7K2tcOxsIXOsm6gYJzfQJ0oUyErc9i4=; b=b7w5ZeSKwUP6US5zBvIHf3NxBUJWrDeVpGI4eSsuU5Y5y+W3IQseO+N4lfDHphyR4d RpxkhFmoJCS4KMdjPAvlmvbCUciLJ6NkFY2n7I0NPj7715JxoLmQ/YRuESyYbywFhoGn PdIrFNDD/461rYk3/R33WQmxUKDMquToG1c2vwXXQgQ9/7Y8wRv69DZwnhY9BbDOOFcU DrI5ZKQeZ0tWoG11WEl/AOtpbJrb73W9iFXgQqYCMWESLPplTTZRYKpwGvyEDfWeZy8R 4gG4/qrt0V7WyKD+aUYa/O5DMd5UKqn63RbKXJ+CAvbZBF7522M1vq01ENTtMkcjPNma j+uw== X-Gm-Message-State: ACrzQf0E0zJolIBPzAhFqGtZLf2PgfEDtHXJOOnABInCVeyowKBL5rfy XQrLgEOoWw9m5vChjLmGOD4= X-Google-Smtp-Source: AMsMyM59iKP1KjXRI2RY6VqzBoVOdD/CE027utRYZAkNz4qTSpNlYVSkeWNF/59ONOeFvkKGMfMkxw== X-Received: by 2002:a05:6a00:138b:b0:561:966a:74a8 with SMTP id t11-20020a056a00138b00b00561966a74a8mr1403827pfg.5.1664794111171; Mon, 03 Oct 2022 03:48:31 -0700 (PDT) Received: from jromail.nowhere (h219-110-108-104.catv02.itscom.jp. [219.110.108.104]) by smtp.gmail.com with ESMTPSA id m3-20020a170902f64300b001781a7c28b9sm6850894plg.240.2022.10.03.03.48.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Oct 2022 03:48:30 -0700 (PDT) Received: from localhost ([127.0.0.1] helo=jrobl) by jrobl id 1ofIzt-00020R-0Q ; Mon, 03 Oct 2022 19:48:29 +0900 From: "J. R. Okajima" Subject: Re: [PATCH][CFT] [coredump] don't use __kernel_write() on kmap_local_page() To: Ira Weiny Cc: Al Viro , Linus Torvalds , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <7713.1664794108.1@jrobl> Date: Mon, 03 Oct 2022 19:48:28 +0900 Message-ID: <7714.1664794108@jrobl> Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Ira Weiny: > On Wed, Sep 28, 2022 at 07:29:43PM +0100, Al Viro wrote: > > On Tue, Sep 27, 2022 at 11:51:17PM +0100, Al Viro wrote: > > > [I'm going to send a pull request tomorrow if nobody yells; > > > please review and test - it seems to work fine here, but extra > > > eyes and extra testing would be very welcome] I tried gdb backtrace 'bt' command with the new core by v6.0, and it doesn't show the call trace correctly. Is it related to this commit? test program ---------------------------------------- void f(int n) { printf("%d\n", n); if (!n) kill(getpid(), SIGQUIT); f(--n); } int main(int argc, char *argv[]) { f(atoi(argv[1])); return 0; } ---------------------------------------- ulimit -c unlimited coredump 2 gdb coredump core bt ---------------------------------------- expected result kill f f f main ---------------------------------------- actual result ?? ?? ---------------------------------------- J. R. Okajima