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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CDE59C433EF for ; Mon, 18 Oct 2021 04:47:50 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 81B22610E8 for ; Mon, 18 Oct 2021 04:47:50 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 81B22610E8 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 1A7B06B006C; Mon, 18 Oct 2021 00:47:50 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 157126B0071; Mon, 18 Oct 2021 00:47:50 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 06CCD6B0072; Mon, 18 Oct 2021 00:47:50 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0157.hostedemail.com [216.40.44.157]) by kanga.kvack.org (Postfix) with ESMTP id ECDE96B006C for ; Mon, 18 Oct 2021 00:47:49 -0400 (EDT) Received: from smtpin32.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id A1FEC2D259 for ; Mon, 18 Oct 2021 04:47:49 +0000 (UTC) X-FDA: 78708325458.32.89FC360 Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by imf20.hostedemail.com (Postfix) with ESMTP id 92B16D0000A7 for ; Mon, 18 Oct 2021 04:47:46 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id F39BA67373; Mon, 18 Oct 2021 06:47:45 +0200 (CEST) Date: Mon, 18 Oct 2021 06:47:45 +0200 From: Christoph Hellwig To: Zqiang Cc: Hao Sun , Hillf Danton , hch@infradead.org, willy@infradead.org, Linux MM , Linux Kernel Mailing List , Christoph Hellwig , syzkaller-bugs@googlegroups.com Subject: Re: WARNING in __init_work Message-ID: <20211018044745.GA23657@lst.de> References: <20210907074432.3711-1-hdanton@sina.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17 (2007-11-01) X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 92B16D0000A7 X-Stat-Signature: jqrpagidp7pesyguh43fx8t944wuqg7b Authentication-Results: imf20.hostedemail.com; dkim=none; spf=none (imf20.hostedemail.com: domain of hch@lst.de has no SPF policy when checking 213.95.11.211) smtp.mailfrom=hch@lst.de; dmarc=none X-HE-Tag: 1634532466-889886 X-Bogosity: Ham, tests=bogofilter, spamicity=0.002365, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Oct 18, 2021 at 12:43:38PM +0800, Zqiang wrote: > This is the details of the test, Hope it helps you Call me stupid, but I can only find the trace and linked to unreadable google sites that wan't me to log in somehow and no actual details. If you have a direct link to the reproducer (an attachment would do it as well) I'd love to try it myself. Otherwise this commit in the block-5.15 tree should help to catch what I suspect is the root cause (final ref drop before unregister) earlier and with a better backtrace: https://git.kernel.dk/cgit/linux-block/commit/?h=block-5.15&id=a20417611b98e12a724e5c828c472ea16990b71f