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=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no 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 32A3BC433DF for ; Fri, 5 Jun 2020 04:02:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 121DA2074B for ; Fri, 5 Jun 2020 04:02:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591329746; bh=4YetJeTqSigg++jHP96/KxPyeD0VjSHYYjyn6+68qRE=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=Q8lqk8AiZt2nQZXjC4CfpsguMfz1MGFNSq8xHQ/s1ijv4lU/Zc1m0ZlRNxaZE3eg/ /2tUwMdKP9yczhdGsrqAa6/tbJnajQoctVq06xQQnK6+OB7+xYMoCf4FFbeSkYvF/l G5/T4GGTkjPPhmEfYx76+BOn6cs6xcZzkryC4zdA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726085AbgFEECW (ORCPT ); Fri, 5 Jun 2020 00:02:22 -0400 Received: from mail.kernel.org ([198.145.29.99]:48022 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726022AbgFEECW (ORCPT ); Fri, 5 Jun 2020 00:02:22 -0400 Received: from sol.localdomain (c-107-3-166-239.hsd1.ca.comcast.net [107.3.166.239]) (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 87FA92074B; Fri, 5 Jun 2020 04:02:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591329741; bh=4YetJeTqSigg++jHP96/KxPyeD0VjSHYYjyn6+68qRE=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=jLOg6HijZZfOwWduH1fPcVNnijybbnBoZxdb9yJnV54wBU1RPZ+Wd1y0JHHX9TvBl 0y7I2k1yhVwJ0ObFKmWSU9LvEtlQJH/+10Cm4uSctE85rN+4+Anr7yJ/cxtZT5eWVh nuZ0/ZCzz9rkzPtfJxxa8Il799erdbSthHyFj9jc= Date: Thu, 4 Jun 2020 21:02:20 -0700 From: Eric Biggers To: Ritesh Harjani Cc: adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, linux-next@vger.kernel.org, sfr@canb.auug.org.au, syzkaller-bugs@googlegroups.com, tytso@mit.edu, syzbot Subject: Re: linux-next test error: BUG: using smp_processor_id() in preemptible [ADDR] code: systemd-rfkill/6728 Message-ID: <20200605040220.GB2667@sol.localdomain> References: <000000000000a7be4a05a74ca69a@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <000000000000a7be4a05a74ca69a@google.com> Sender: linux-next-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-next@vger.kernel.org Introduced by: commit 42f56b7a4a7db127a9d281da584152dc3d525d25 Author: Ritesh Harjani Date: Wed May 20 12:10:34 2020 +0530 ext4: mballoc: introduce pcpu seqcnt for freeing PA to improve ENOSPC handling On Thu, Jun 04, 2020 at 07:02:18PM -0700, syzbot wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: 0e21d462 Add linux-next specific files for 20200602 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=10461661100000 > kernel config: https://syzkaller.appspot.com/x/.config?x=ecc1aef35f550ee3 > dashboard link: https://syzkaller.appspot.com/bug?extid=aed048f49c59eb997737 > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+aed048f49c59eb997737@syzkaller.appspotmail.com > > BUG: using smp_processor_id() in preemptible [00000000] code: systemd-rfkill/6728 > caller is ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711 > CPU: 1 PID: 6728 Comm: systemd-rfkill Not tainted 5.7.0-next-20200602-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0x18f/0x20d lib/dump_stack.c:118 > check_preemption_disabled+0x20d/0x220 lib/smp_processor_id.c:48 > ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711 > ext4_ext_map_blocks+0x201b/0x33e0 fs/ext4/extents.c:4244 > ext4_map_blocks+0x4cb/0x1640 fs/ext4/inode.c:626 > ext4_getblk+0xad/0x520 fs/ext4/inode.c:833 > ext4_bread+0x7c/0x380 fs/ext4/inode.c:883 > ext4_append+0x153/0x360 fs/ext4/namei.c:67 > ext4_init_new_dir fs/ext4/namei.c:2757 [inline] > ext4_mkdir+0x5e0/0xdf0 fs/ext4/namei.c:2802 > vfs_mkdir+0x419/0x690 fs/namei.c:3632 > do_mkdirat+0x21e/0x280 fs/namei.c:3655 > do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359 > entry_SYSCALL_64_after_hwframe+0x44/0xa9 > RIP: 0033:0x7f9ffaa79687 > Code: Bad RIP value. > RSP: 002b:00007ffeb3197c38 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 > RAX: ffffffffffffffda RBX: 000055c2e6155985 RCX: 00007f9ffaa79687 > RDX: 00007ffeb3197b00 RSI: 00000000000001ed RDI: 000055c2e6155985 > RBP: 00007f9ffaa79680 R08: 0000000000000100 R09: 0000000000000000 > R10: 000055c2e6155980 R11: 0000000000000246 R12: 00000000000001ed > R13: 00007ffeb3197dc0 R14: 0000000000000000 R15: 0000000000000000 > > > --- > This bug is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@googlegroups.com. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. >