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 X-Spam-Level: X-Spam-Status: No, score=-1.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 05D56C46464 for ; Mon, 13 Aug 2018 03:10:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A410A21785 for ; Mon, 13 Aug 2018 03:10:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="I/+t2aa2" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A410A21785 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727799AbeHMFun (ORCPT ); Mon, 13 Aug 2018 01:50:43 -0400 Received: from mail-pg1-f196.google.com ([209.85.215.196]:42341 "EHLO mail-pg1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725859AbeHMFum (ORCPT ); Mon, 13 Aug 2018 01:50:42 -0400 Received: by mail-pg1-f196.google.com with SMTP id y4-v6so6872377pgp.9; Sun, 12 Aug 2018 20:10:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=to:cc:from:subject:message-id:date:user-agent:mime-version :content-transfer-encoding:content-language; bh=GRnuIkCAp9Yad6XxdSbUQ+/GvlApUDzXZbi+ZA+He9g=; b=I/+t2aa2EsCE4/Ah6lvtymYe9fg3K4yWV9ckz9acxKEqH6xW/ehBBKvv1HWlZ1VHnY rCeW1zdJOYDgVz7irh1GPK5h8yt1Gq7iqtkBeqVCvcm2H8cubKeWDDA5kkDNB7oogNbY WCzYYV/97nCORlThA0gFACrJC46o2kvbyUT8uVQ43N6ol+OfEyFhwY+PpUHY9F2f0ll4 gP7rBfP5gtHz70Mvan2EPcYVHjybmjsiZyf0HyHo5ZAnLSyE/tl48o+I18R6gpMSPDtE zZQWijXnl6k+CaroWFL/4Hz5WOmxw612jJQBe4JH8Edue8Ee++x8mxtsIPEjE1WA+HoT zYGA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:to:cc:from:subject:message-id:date:user-agent :mime-version:content-transfer-encoding:content-language; bh=GRnuIkCAp9Yad6XxdSbUQ+/GvlApUDzXZbi+ZA+He9g=; b=WyPGd6DWXcDBOFdKEXVZiKtv9WhDtgHDGO57/kyWxXsWY12gajVZFioIOQ6k+2pnQJ lP5OK6uIe7jyIW7+4p74L3oO1gENA0LYtqfWgcaCex0nAs64Aq7P0KTkQKDeOSAo66Jb sVevcX4Oe5v39TX1P4Ykxt4k6Zw7igSTLs1TXGcwF25lrnSPIB8MfkQkycZ2a7ch6Ul9 74vDw8gHEhZyCsd182yi1TUJPHdas0GjVpAVci3/3XRhQRTKCdvXF0ojoDgFNtasqMjR okXMOMavUvMrmvmgAcPp7ZsTeHwbvBKL9+tRdVc107m3BS2yWq+m1voN+ACeApt972TL +QJA== X-Gm-Message-State: AOUpUlFlwOmc+443lsycl2ByudRx9cTRFxGVUnPz/OFW1t89JsW4wdZn 5UxBwgCbwtUSCCUwjur05k0FtiOh X-Google-Smtp-Source: AA+uWPzkbN1J6yc7hfeW/uujJq9B7Z+On3HdIcIpFMTVXcOaa151yAVt2Bkt0QigrFpT4ctlIVZ8qQ== X-Received: by 2002:a63:d80f:: with SMTP id b15-v6mr15507500pgh.347.1534129829186; Sun, 12 Aug 2018 20:10:29 -0700 (PDT) Received: from ?IPv6:2402:f000:1:1501:200:5efe:166.111.71.57? ([2402:f000:1:1501:200:5efe:a66f:4739]) by smtp.gmail.com with ESMTPSA id c66-v6sm30854830pfc.138.2018.08.12.20.10.26 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 12 Aug 2018 20:10:28 -0700 (PDT) To: akpm@linux-foundation.org, jack@suse.cz, mgorman@techsingularity.net, ak@linux.intel.com, mawilcox@microsoft.com, viro@zeniv.linux.org.uk, mawilcox@microsoft.com, ross.zwisler@linux.intel.com Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-fsdevel From: Jia-Ju Bai Subject: [BUG] mm: truncate: a possible sleep-in-atomic-context bug in truncate_exceptional_pvec_entries() Message-ID: Date: Mon, 13 Aug 2018 11:10:23 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.2.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The kernel may sleep with holding a spinlock. The function call paths (from bottom to top) in Linux-4.16 are: [FUNC] schedule fs/dax.c, 259: schedule in get_unlocked_mapping_entry fs/dax.c, 450: get_unlocked_mapping_entry in __dax_invalidate_mapping_entry fs/dax.c, 471: __dax_invalidate_mapping_entry in dax_delete_mapping_entry mm/truncate.c, 97: dax_delete_mapping_entry in truncate_exceptional_pvec_entries mm/truncate.c, 82: spin_lock_irq in truncate_exceptional_pvec_entries I do not find a good way to fix, so I only report. This is found by my static analysis tool (DSAC). Thanks, Jia-Ju Bai