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 55F56C433E0 for ; Fri, 5 Jun 2020 04:13:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 30CAD207D3 for ; Fri, 5 Jun 2020 04:13:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591330383; bh=+NxZeQQV122stsr2nScCsU71IkrPpO3LGJL9ob3Ylfs=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=xT0ZG+X4OySQ3G2aYpMwzLEwUTg78pmBgRr/T5+uuSIfrN7NUon2Y+NqtQGC3u1ro sN2fb7BDYqxUZ9jx3+PF+zLQbpBDit3oSzmTV4fQwJZZEnxtn/WN5I4eImbe0nvRrN 4b11UAhnly9+xmg1Erl47iwzJ0EklpDfFK0quOOo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726191AbgFEENC (ORCPT ); Fri, 5 Jun 2020 00:13:02 -0400 Received: from mail.kernel.org ([198.145.29.99]:51642 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725968AbgFEENC (ORCPT ); Fri, 5 Jun 2020 00:13:02 -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 8C2E820738; Fri, 5 Jun 2020 04:13:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591330381; bh=+NxZeQQV122stsr2nScCsU71IkrPpO3LGJL9ob3Ylfs=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=eSFGS2diQET6j2vGSoHzUnXsAJ9v+U94pytvnWomxYEowwy3E9mwRNj1YPIQfvOIM pubHOYTXzYrlR/mAay9MkjQ74s6bJpmSIfTrQUr76QSRG/yBG51VXM0I/CXhuPrv5X WxPZ6FCG1vjd3P9t3+E7hsI33ozr7o6PpuUQ2npg= Date: Thu, 4 Jun 2020 21:13:00 -0700 From: Eric Biggers To: syzbot 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 Subject: Re: linux-next test error: BUG: using smp_processor_id() in preemptible [ADDR] code: syz-fuzzer/6927 Message-ID: <20200605041300.GF2667@sol.localdomain> References: <00000000000098f29705a7181812@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <00000000000098f29705a7181812@google.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jun 02, 2020 at 04:20:17AM -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=1597f2fe100000 > kernel config: https://syzkaller.appspot.com/x/.config?x=ecc1aef35f550ee3 > dashboard link: https://syzkaller.appspot.com/bug?extid=cd8a20b91d68ef113b45 > 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+cd8a20b91d68ef113b45@syzkaller.appspotmail.com > > BUG: using smp_processor_id() in preemptible [00000000] code: syz-fuzzer/6927 > caller is ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711 > CPU: 1 PID: 6927 Comm: syz-fuzzer 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: 0033:0x4b02a0 > Code: Bad RIP value. > RSP: 002b:000000c0000cf4b8 EFLAGS: 00000212 ORIG_RAX: 0000000000000102 > RAX: ffffffffffffffda RBX: 000000c00002c000 RCX: 00000000004b02a0 > RDX: 00000000000001c0 RSI: 000000c000116be0 RDI: ffffffffffffff9c > RBP: 000000c0000cf510 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000212 R12: ffffffffffffffff > R13: 0000000000000060 R14: 000000000000005f R15: 0000000000000100 > > #syz dup: linux-next test error: BUG: using smp_processor_id() in preemptible [ADDR] code: syz-fuzzer/6792