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=-0.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 DC21EC32789 for ; Wed, 7 Nov 2018 01:38:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 946E82086C for ; Wed, 7 Nov 2018 01:38:07 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 946E82086C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389178AbeKGLGN (ORCPT ); Wed, 7 Nov 2018 06:06:13 -0500 Received: from mail-it1-f199.google.com ([209.85.166.199]:54952 "EHLO mail-it1-f199.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731041AbeKGLGN (ORCPT ); Wed, 7 Nov 2018 06:06:13 -0500 Received: by mail-it1-f199.google.com with SMTP id r79-v6so8154585itc.4 for ; Tue, 06 Nov 2018 17:38:05 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=zLfIIYC+kz0FLbrzhXVatrNwp2S/BkHfR0TxQ0h2Gas=; b=Ru7hkA0TePTspCu4rVDP3OQLS0fNS/2zqino1DgQhjRAPbJsGjlY8lP/nr+wupGgXt 6AkyZM/+4VCqcH4vgxfTmyquDx1WkrvsI3vi6yqhYcc5QQLIJ5RFCAJ9jX2sVNNWsEKf wjacy8LBbBy2sSspkj1BIG7sgVD1t2BkOFtI7UyGKkfgI6KH/RHYnkdBuTvVfD1ZfteX XrkTEpxIcvwNywkf5wpAwd0zciYuWvTM9EZGulvk69JMelcP2ctoRLbnVWxyOsy81VQ+ oUHZwAhyu9xNzBYzDiP/nTQpcOe7yjeuCfguyrr+22ALNayPupNyLDGVsqxzVzbrt/jr Uc7A== X-Gm-Message-State: AGRZ1gJnWAC52Z64MVzCVS+v0es+QYmFg1LnaKryU6Pn+E6qBDx1kni+ Eda4D8Fejb9KOKYX77/0+Fox15nRKwaIzV0+8i/nOZ8OFW4u X-Google-Smtp-Source: AJdET5fnVMjV8FauntCO4Ro9YwYXMIumNDAQWINnqlbLONzWQek1I6q1EFpZDH35B7KQ/py1E7DmBsRXn+Vd6b8o+4M2Z56qqYo+ MIME-Version: 1.0 X-Received: by 2002:a6b:3b4b:: with SMTP id i72-v6mr19926989ioa.6.1541554684843; Tue, 06 Nov 2018 17:38:04 -0800 (PST) Date: Tue, 06 Nov 2018 17:38:04 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000645f00057a092b8c@google.com> Subject: BUG: spinlock cpu recursion on CPU, syz-executor From: syzbot To: bp@alien8.de, hpa@zytor.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, mingo@redhat.com, pbonzini@redhat.com, rkrcmar@redhat.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, x86@kernel.org Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 651022382c7f Linux 4.20-rc1 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14d6ae33400000 kernel config: https://syzkaller.appspot.com/x/.config?x=8f559fee2fc3375a dashboard link: https://syzkaller.appspot.com/bug?extid=e9a3960298616a5a5abc compiler: gcc (GCC) 8.0.1 20180413 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=130d742b400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+e9a3960298616a5a5abc@syzkaller.appspotmail.com IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready 8021q: adding VLAN 0 to HW filter on device team0 8021q: adding VLAN 0 to HW filter on device team0 L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/l1tf.html for details. BUG: spinlock cpu recursion on CPU#0, syz-executor0/8023 lock: 0xffffc900045ea000, .magic: dead4ead, .owner: /-1, .owner_cpu: 0 CPU: 0 PID: 8023 Comm: syz-executor0 Not tainted 4.20.0-rc1+ #99 kobject: 'kvm' (00000000968c974f): kobject_uevent_env Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 kobject: 'kvm' (00000000968c974f): kobject_uevent_env Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x244/0x39d lib/dump_stack.c:113 spin_dump.cold.3+0x81/0xe7 kernel/locking/spinlock_debug.c:67 kobject: 'kvm' (00000000968c974f): fill_kobj_path: path = '/devices/virtual/misc/kvm' spin_bug kernel/locking/spinlock_debug.c:75 [inline] debug_spin_lock_before kernel/locking/spinlock_debug.c:85 [inline] do_raw_spin_lock+0x26a/0x350 kernel/locking/spinlock_debug.c:112 kobject: 'loop2' (000000000bdb293a): kobject_uevent_env __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_lock+0x35/0x40 kernel/locking/spinlock.c:144 kobject: 'loop2' (000000000bdb293a): fill_kobj_path: path = '/devices/virtual/block/loop2' spin_lock include/linux/spinlock.h:329 [inline] kvm_mmu_change_mmu_pages+0xf3/0x450 arch/x86/kvm/mmu.c:2717 kobject: 'kvm' (00000000968c974f): kobject_uevent_env kvm_arch_commit_memory_region+0x289/0x2d0 arch/x86/kvm/x86.c:9322 kobject: 'kvm' (00000000968c974f): fill_kobj_path: path = '/devices/virtual/misc/kvm' __kvm_set_memory_region+0x1c99/0x2d50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1064 kobject: 'kvm' (00000000968c974f): kobject_uevent_env kobject: 'kvm' (00000000968c974f): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (00000000968c974f): kobject_uevent_env kvm_set_memory_region+0x2e/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1085 kobject: 'kvm' (00000000968c974f): kobject_uevent_env kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1097 [inline] kvm_vm_ioctl+0x652/0x1d60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2995 kobject: 'loop3' (0000000005b5310e): kobject_uevent_env kobject: 'kvm' (00000000968c974f): kobject_uevent_env kobject: 'kvm' (00000000968c974f): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (00000000968c974f): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (00000000968c974f): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (00000000968c974f): fill_kobj_path: path = '/devices/virtual/misc/kvm' vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x1de/0x1790 fs/ioctl.c:696 kobject: 'loop3' (0000000005b5310e): fill_kobj_path: path = '/devices/virtual/block/loop3' ------------[ cut here ]------------ downgrading a read lock WARNING: CPU: 1 PID: 5667 at kernel/locking/lockdep.c:3556 __lock_downgrade kernel/locking/lockdep.c:3556 [inline] WARNING: CPU: 1 PID: 5667 at kernel/locking/lockdep.c:3556 lock_downgrade+0x4d7/0x900 kernel/locking/lockdep.c:3819 --- 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#bug-status-tracking for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches