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=-6.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 999E5C433DF for ; Tue, 7 Jul 2020 20:24:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6D08320720 for ; Tue, 7 Jul 2020 20:24:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594153450; bh=40urT3yultzL1QLUZ36YCR16H0oUPShoY0I57dvbUr8=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=yg0Fo+O7g3eDmagzgVuvmLvgYRuuU6NJaAgb/XaNmTGhG5uJr52nUKpUVpdiExeQY Pqhbe3hUwGtmcnDy8Q8EJB2XvZlaneFzaVNRkbCD2lWLEsY8vH6kCQwjY5kmxd7tf9 4HNVwBvdm+Q/Kst6zGMCEQ/zT2+9mRlL2UF/SaJI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728447AbgGGUYH (ORCPT ); Tue, 7 Jul 2020 16:24:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:47690 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728292AbgGGUYG (ORCPT ); Tue, 7 Jul 2020 16:24:06 -0400 Received: from gmail.com (unknown [104.132.1.76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 79B99206BE; Tue, 7 Jul 2020 20:24:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594153445; bh=40urT3yultzL1QLUZ36YCR16H0oUPShoY0I57dvbUr8=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=nT/o5KAXF2gFIf05jT6b2gEiT9nuQSKnyAqyTp57qFBRm/vDI9YT0MrRyzYNOdjTG W+tMQIpTmbs4CxmsWHyeZdBOMG3x2QuunzX8XSwDLhY9W8x3dRhdnAJKSxJjaQ90e8 zsyYhLPzxBRvCKxIK3EnzApxnnv0i9R+pTEq2A9s= Date: Tue, 7 Jul 2020 13:24:04 -0700 From: Eric Biggers To: syzbot Cc: bp@alien8.de, hpa@zytor.com, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, luto@kernel.org, mingo@redhat.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, viro@zeniv.linux.org.uk, x86@kernel.org Subject: Re: BUG: sleeping function called from invalid context in do_user_addr_fault Message-ID: <20200707202404.GA3426938@gmail.com> References: <0000000000002c6fbf05a8954afe@google.com> <0000000000006dbe1005a9dfaa7c@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0000000000006dbe1005a9dfaa7c@google.com> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On Tue, Jul 07, 2020 at 01:16:25PM -0700, syzbot wrote: > syzbot has found a reproducer for the following crash on: > > HEAD commit: 7cc2a8ea Merge tag 'block-5.8-2020-07-01' of git://git.ker.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=14ed01a3100000 > kernel config: https://syzkaller.appspot.com/x/.config?x=183dd243398ba7ec > dashboard link: https://syzkaller.appspot.com/bug?extid=7748c5375dc20dfdb92f > compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1469d28f100000 > The reproducer uses ioctl$FBIOPUT_VSCREENINFO on /dev/fb0, which is generating lots of other syzbot reports. This is probably another duplicate. See https://lkml.kernel.org/lkml/000000000000ff323f05a053100c@google.com/T/#u for some previous discussion.