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 06A96C433FE for ; Tue, 4 Oct 2022 19:34:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229658AbiJDTeH (ORCPT ); Tue, 4 Oct 2022 15:34:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53330 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229515AbiJDTeF (ORCPT ); Tue, 4 Oct 2022 15:34:05 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0B8A4696D2 for ; Tue, 4 Oct 2022 12:34:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1664912044; 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: content-transfer-encoding:content-transfer-encoding; bh=F5xmAN9t6CeE2TFrsq+QgzxqKIzmy0qcB2aGqOypPbg=; b=BUfjo1pKaAhWfrazQwSj/dowlERF8DaJVE4wULp3QxVVHtnKwqdhr2VonmFEBBU0jx5WB2 1BFfVuea/wqmX4iCVNcHbQ6jk0mNoz1RzxZoxik7AtZ66YP0MMOXHqvqANV6KTxe9TgbOW XIfvYNUCs8ppWXkvSt5Ng6xldDuB/pY= Received: from mail-qk1-f199.google.com (mail-qk1-f199.google.com [209.85.222.199]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_128_GCM_SHA256) id us-mta-524-d4l1OzjiOgmNC4V5gKJ7Iw-1; Tue, 04 Oct 2022 15:34:03 -0400 X-MC-Unique: d4l1OzjiOgmNC4V5gKJ7Iw-1 Received: by mail-qk1-f199.google.com with SMTP id j13-20020a05620a288d00b006be7b2a758fso12370092qkp.1 for ; Tue, 04 Oct 2022 12:34:03 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date; bh=F5xmAN9t6CeE2TFrsq+QgzxqKIzmy0qcB2aGqOypPbg=; b=7WFrS537whkSBSqpnlu8zxFHk86O2+HXSzIxT7BrzhNdN4Gb+gm0wS3DDsFdigfwCo kcQm5U2cv3G/c3cO4AadyuasMJmOHBm5RByAglNLvv73ov8/8CUo6LuXrJX0pGGAb9m9 NOlxJ6NUq7iOBfVLF8vlKrh/63glkxz2IADj4HHZP9a0Yx0306nwln0an9qsZuE77XtT GPUQbSSThk+dy02v6bTfDHk94fbQ2xjFdNXmM1uJ2Jhinus7dcCJoyTFNlU6MNVw19HU tsPcEQDTGI1q+M1I6HQQZF/3441JBBhOyqoRHIYMPgzO0PFfXMC/79Lb8adJNx+M/Ltr cKiA== X-Gm-Message-State: ACrzQf2AIzoBCXBOGsYOo2nUrzhlQslcGml8sRujUdhJ9VgguLBqLVnR rhSaMU5VYpAu+PpFrRjnSg5DyKXrlyi7u2eESQ/gpHCI/dVRiKfFmKju0m4SakcGuezLXK+6UnY orgN/UhHPBCrW5QGoQhXbvE8B X-Received: by 2002:a05:622a:341:b0:35d:44fc:3908 with SMTP id r1-20020a05622a034100b0035d44fc3908mr21104944qtw.507.1664912042645; Tue, 04 Oct 2022 12:34:02 -0700 (PDT) X-Google-Smtp-Source: AMsMyM5jAF/2MHQhLJAx9+6UCeRp8zUWOpJ+7sJqhIuTupkh+lahPG8XXzChn6HoW8Wyr49jN/OPRQ== X-Received: by 2002:a05:622a:341:b0:35d:44fc:3908 with SMTP id r1-20020a05622a034100b0035d44fc3908mr21104926qtw.507.1664912042438; Tue, 04 Oct 2022 12:34:02 -0700 (PDT) Received: from x1n.redhat.com (bras-base-aurron9127w-grc-46-70-31-27-79.dsl.bell.ca. [70.31.27.79]) by smtp.gmail.com with ESMTPSA id z5-20020a05622a028500b00342fb07944fsm13299811qtw.82.2022.10.04.12.34.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 04 Oct 2022 12:34:01 -0700 (PDT) From: Peter Xu To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Mike Rapoport , peterx@redhat.com, David Hildenbrand , Andrew Morton , Andrea Arcangeli , Nadav Amit , Axel Rasmussen , Mike Kravetz Subject: [PATCH v3 0/3] mm/hugetlb: Fix selftest failures with write check Date: Tue, 4 Oct 2022 15:33:57 -0400 Message-Id: <20221004193400.110155-1-peterx@redhat.com> X-Mailer: git-send-email 2.37.3 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org v3: - Rebase to akpm mm-unstable v2: - Fix the commit message of patch 1, replacing CoW with wr-unprotect example Currently akpm mm-unstable fails with uffd hugetlb private mapping test randomly on a write check. The initial bisection of that points to the recent pmd unshare series, but it turns out there's no direction relationship with the series but only some timing change caused the race to start trigger. The race should be fixed in patch 1. Patch 2 is a trivial cleanup on the similar race with hugetlb migrations, patch 3 comment on the write check so when anyone read it again it'll be clear why it's there. Thanks, Peter Xu (3): mm/hugetlb: Fix race condition of uffd missing/minor handling mm/hugetlb: Use hugetlb_pte_stable in migration race check mm/selftest: uffd: Explain the write missing fault check mm/hugetlb.c | 66 ++++++++++++++++++++---- tools/testing/selftests/vm/userfaultfd.c | 22 +++++++- 2 files changed, 76 insertions(+), 12 deletions(-) -- 2.37.3