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[23.128.96.18]) by mx.google.com with ESMTP id lv23si14468759ejb.649.2021.10.04.16.33.57; Mon, 04 Oct 2021 16:34:21 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=casper.20170209 header.b=vyk2lzF+; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234043AbhJDTI2 (ORCPT + 99 others); Mon, 4 Oct 2021 15:08:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59752 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233226AbhJDTI0 (ORCPT ); Mon, 4 Oct 2021 15:08:26 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AE3EAC061745 for ; Mon, 4 Oct 2021 12:06:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=7zYvaCcq57Js9HjY/9WIt0IYEIm/CuFzck0eVZIai9g=; b=vyk2lzF+2IZ/khyEnmhSkvPS8E VyUjFIxDfsc0bA6aExl92KlG4k5UD1AcK6KPGMjadqdtLDM3pf4ofruHu5qW0Is4kgOb8kfv+yY/3 ZPQkg+HHdKFPxLcUF2WH0oKOLxK9/EG2AJbvBSMwC34Kn4CnucZtXKTUjy/mkqsUQm0CvicuvlcFa yL/oWXGOuNiJ1o9fNWzVLRErw7emIqwqDACX2xsp6Tc8bnAqElrZ2vqFZmrE4w4184QujRnofHMxO KZ9jhxS6EF46riwLNtFOFqxUAvfOPtvQTaMgfhdpUKmSJQaZhvc7Djco/xhBTyCa3as+fP7RLle7c XwRlbf1w==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1mXTGx-00HDiE-U4; Mon, 04 Oct 2021 19:05:35 +0000 Date: Mon, 4 Oct 2021 20:05:11 +0100 From: Matthew Wilcox To: Rongwei Wang Cc: Song Liu , Hugh Dickins , Andrew Morton , Linux MM , Linux Kernel Mailing List , William Kucharski Subject: Re: [PATCH v2 1/2] mm, thp: check page mapping when truncating page cache Message-ID: References: <68737431-01d2-e6e3-5131-7d7c731e49ae@linux.alibaba.com> <8d8fb192-bd8d-8a08-498d-ca7204d4a716@linux.alibaba.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8d8fb192-bd8d-8a08-498d-ca7204d4a716@linux.alibaba.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Oct 05, 2021 at 01:26:50AM +0800, Rongwei Wang wrote: > Hi, > I have run our cases these two days to stress test new Patch #1. The new > Patch #1 mainly add filemap_invalidate_{un}lock before and after > truncate_pagecache(), basing on original Patch #1. And the crash has not > happened. You shouldn't need most of patch 1. In fact, the only two patches you should need would be this: +++ b/mm/filemap.c @@ -2093,7 +2093,6 @@ unsigned find_lock_entries(struct address_space *mapping, pgoff_t start, if (!xa_is_value(page)) { if (page->index < start) goto put; - VM_BUG_ON_PAGE(page->index != xas.xa_index, page); if (page->index + thp_nr_pages(page) - 1 > end) goto put; if (!trylock_page(page)) (already in Andrew's tree) and: > - if (filemap_nr_thps(inode->i_mapping)) > + if (filemap_nr_thps(inode->i_mapping)) { > + filemap_invalidate_lock(inode->i_mapping); > truncate_pagecache(inode, 0); > + filemap_invalidate_unlock(inode->i_mapping); > + } If you can still hit a bug with just those two patches, then something else is going wrong, and needs to be investigated.