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=-0.4 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 E7F32C04ABB for ; Tue, 11 Sep 2018 06:12:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 93BE4206BB for ; Tue, 11 Sep 2018 06:12:07 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 93BE4206BB 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 S1727411AbeIKLJq (ORCPT ); Tue, 11 Sep 2018 07:09:46 -0400 Received: from mail-it0-f71.google.com ([209.85.214.71]:58575 "EHLO mail-it0-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726353AbeIKLJq (ORCPT ); Tue, 11 Sep 2018 07:09:46 -0400 Received: by mail-it0-f71.google.com with SMTP id x15-v6so6019ite.8 for ; Mon, 10 Sep 2018 23:12:04 -0700 (PDT) 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=rONckUT4Uv0+6WkLOGykl3ETDkZrgJWKyapO3WAD5Xk=; b=pp/40JEVx2TQSHqiZ6YI+sKBBKgQozLM0MmhBxk3OYrnrtREaAoPSwiOwgT3spRjTn HHT22pXvaUZIhqt8Q5miM6QSE3e6IXL/jOx5YmLUkKnxD8t2DIMPaXzIFc8k5IIhEX6G ZbJvaaljf9WlQ7ccc0gV83F06hxsnppwnU58HwcxPOyQ5HFpdH5pdDEIRzXfM0nzzoRv BT+9LcHQP2Ilr3vlpGrsyicNNec9h5laGoOyAdz6qg7OUXCE/Jgf49cgltLwIKB7HHvC 7BIqRsbaNzkZ/eFAqZHP/fh9u1Vsps3wK+xmF6L3EIgATfbSayHepYksxxB9FXQ1OLqg wUhg== X-Gm-Message-State: APzg51Bu7KYxN5kTc/C8q9KROxSWi2oVes8Eo93e0olPoziOaavq6WPs EdTr2B/7phVcJhFHxXp4LA8287/oPNrjSd9AR9TJ19ecswU/ X-Google-Smtp-Source: ANB0VdZyb0MvMJIiRxCPFWpDRl6gjPcgtlnvqFBAyry9k/OSkCD2T2BHSR3pnIivqpo+wgmwqZL+93jSVjdNci13xS3odqIs6SXf MIME-Version: 1.0 X-Received: by 2002:a24:6ecd:: with SMTP id w196-v6mr156617itc.24.1536646324322; Mon, 10 Sep 2018 23:12:04 -0700 (PDT) Date: Mon, 10 Sep 2018 23:12:04 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000004e8a8c0575925aa2@google.com> Subject: INFO: rcu detected stall in kvm_arch_vcpu_ioctl_run From: syzbot To: 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: 3d0e7a9e00fd Merge tag 'md/4.19-rc2' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12820cd1400000 kernel config: https://syzkaller.appspot.com/x/.config?x=8f59875069d721b6 dashboard link: https://syzkaller.appspot.com/bug?extid=b3fdc9590894087f1188 compiler: gcc (GCC) 8.0.1 20180413 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16940056400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+b3fdc9590894087f1188@syzkaller.appspotmail.com 8021q: adding VLAN 0 to HW filter on device team0 8021q: adding VLAN 0 to HW filter on device team0 8021q: adding VLAN 0 to HW filter on device team0 hrtimer: interrupt took 32920 ns 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. rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 1, t=10502 jiffies, g=7509, q=466) rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295044073-4295033571), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor7 R running task 23424 7586 5576 0x00000000 Call Trace: sched_show_task.cold.83+0x2b6/0x30a kernel/sched/core.c:5296 print_other_cpu_stall.cold.79+0xa83/0xba5 kernel/rcu/tree.c:1430 check_cpu_stall kernel/rcu/tree.c:1557 [inline] __rcu_pending kernel/rcu/tree.c:3276 [inline] rcu_pending kernel/rcu/tree.c:3319 [inline] rcu_check_callbacks+0xafc/0x1990 kernel/rcu/tree.c:2665 update_process_times+0x2d/0x70 kernel/time/timer.c:1636 tick_sched_handle+0x9f/0x180 kernel/time/tick-sched.c:164 tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1274 __run_hrtimer kernel/time/hrtimer.c:1398 [inline] __hrtimer_run_queues+0x41c/0x10d0 kernel/time/hrtimer.c:1460 hrtimer_interrupt+0x313/0x780 kernel/time/hrtimer.c:1518 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1029 [inline] smp_apic_timer_interrupt+0x1a1/0x760 arch/x86/kernel/apic/apic.c:1054 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:864 RIP: 0010:arch_local_irq_enable arch/x86/include/asm/paravirt.h:798 [inline] RIP: 0010:vcpu_enter_guest+0x12ad/0x62e0 arch/x86/kvm/x86.c:7610 Code: 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 b7 4a 00 00 48 83 3d bd 8c 43 08 00 0f 84 b1 3d 00 00 e8 3a 32 70 00 fb 66 0f 1f 44 00 00 01 00 00 00 e8 09 cf 46 00 31 ff 65 44 8b 25 af 50 f3 7e 44 89 RSP: 0018:ffff8801b116f4f0 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff8801cd182680 RBX: ffff8801d97f8080 RCX: 1ffff10039a305e4 RDX: 0000000000000000 RSI: ffffffff810e9d06 RDI: ffffffff895229b8 RBP: ffff8801b116f840 R08: ffff8801cd182f20 R09: 0000000000000006 R10: 0000000000000000 R11: ffff8801cd182680 R12: ffff8801cd182680 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 vcpu_run arch/x86/kvm/x86.c:7693 [inline] kvm_arch_vcpu_ioctl_run+0x375/0x16e0 arch/x86/kvm/x86.c:7870 kvm_vcpu_ioctl+0x72b/0x1150 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2590 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702 __do_sys_ioctl fs/ioctl.c:709 [inline] __se_sys_ioctl fs/ioctl.c:707 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457099 Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffdfe480958 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000001598914 RCX: 0000000000457099 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004cf730 R14: 00000000004c59b9 R15: 0000000000000000 rcu: rcu_preempt kthread starved for 10502 jiffies! g7509 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 22872 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3473 schedule+0xfe/0x460 kernel/sched/core.c:3517 schedule_timeout+0x140/0x260 kernel/time/timer.c:1804 rcu_gp_kthread+0x9d9/0x2310 kernel/rcu/tree.c:2194 kthread+0x35a/0x420 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413 --- 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