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 51D16C77B7F for ; Wed, 17 May 2023 12:20:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231590AbjEQMUc (ORCPT ); Wed, 17 May 2023 08:20:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35626 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229815AbjEQMUb (ORCPT ); Wed, 17 May 2023 08:20:31 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 81065198E; Wed, 17 May 2023 05:20:28 -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=NrmV1RlXNUksQObxSTnk5T7ZKt0dHdVGx6FKtxXOMuE=; b=lz5gMl8DB28Tk7MctDq2tS5GlA 6jrqXdvhj1jiLFhVKu9DBa7R/C1q/NIQQzW+3uK7M1QZbsB+VkHpUo+2SfY1FTkpked+w8haV+oZB VJSl3NByTzlAgkfrlAEkODeNDuHWkNQyA4r6mm9EckjjrPNUCcjd5qjkBNy89TZbWuqR6KcOYko9c KEVSjvVE/iWEJYSQC4qIao/hxYfWZxBNHfY5dfhuCdx1nXs2GHVQjN6AdC1n64DkHzEUk5cfetqBc NkQhEuQxcWD0XuJIJelG8PGF+FmDmdrKyt/Y3R8S9ffXUS38IT0aoAKtMtjXOqgwZNYtI6dmURcT1 M/1FPFzA==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1pzG8m-0054gz-A1; Wed, 17 May 2023 12:20:24 +0000 Date: Wed, 17 May 2023 13:20:24 +0100 From: Matthew Wilcox To: yang lan Cc: viro@zeniv.linux.org.uk, linux-kernel@vger.kernel.org, josef@toxicpanda.com, linux-block@vger.kernel.org, nbd@other.debian.org, syzkaller-bugs@googlegroups.com, linux-fsdevel@vger.kernel.org, axboe@kernel.dk, haris.iqbal@ionos.com, jinpu.wang@ionos.com, brauner@kernel.org Subject: Re: INFO: task hung in blkdev_open bug Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On Wed, May 17, 2023 at 07:12:23PM +0800, yang lan wrote: > root@syzkaller:~# uname -a > Linux syzkaller 5.10.179 #1 SMP PREEMPT Thu Apr 27 16:22:48 CST 2023 Does this reproduce on current kernels, eg 6.4-rc2? > root@syzkaller:~# gcc poc_blkdev.c -o poc_blkdev You need to include poc_blkdev.c as part of your report. > Please let me know if I can provide any more information, and I hope I > didn't mess up this bug report. I suspect you've done something that is known to not work (as root, so we won't necessarily care). But I can't really say without seeing what you've done. Running syzkaller is an art, and most people aren't good at it. It takes a lot of work to submit good quality bug reports, see this article: https://blog.regehr.org/archives/2037