Since few days ago (maybe kernel version 4.8.11, but not sure), a warning with a call trace is appearing from time to time in the system log, I guess when starting up a KVM machine. The system looks fine, and if you need more information, just let me know and I'll try to provide everything requested. The log below is from the recently released 4.9.0: Dec 12 10:02:58 desktop kernel: ------------[ cut here ]------------ Dec 12 10:02:58 desktop kernel: WARNING: CPU: 3 PID: 1034 at kernel/cgroup.c:492 cgroup_get+0x55/0x70 Dec 12 10:02:58 desktop kernel: Modules linked in: vhost_net vhost macvtap macvlan algif_skcipher af_alg xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf Dec 12 10:02:58 desktop kernel: ablk_helper snd_pcm mei_me e1000e cryptd serio_raw drm lpc_ich firewire_core mei i2c_i801 snd_timer crc_itu_t ptp pp Dec 12 10:02:58 desktop kernel: CPU: 3 PID: 1034 Comm: vhost-1020 Tainted: P OE 4.9.0-gentoo_kdbus-bfq-300Hz #1 Dec 12 10:02:58 desktop kernel: Hardware name: System manufacturer System Product Name/P9X79 WS, BIOS 4601 03/05/2014 Dec 12 10:02:58 desktop kernel: 0000000000000000 ffffffff812b06cd 0000000000000000 0000000000000000 Dec 12 10:02:58 desktop kernel: ffffffff8105134a ffff880427672400 ffff8804216a8780 ffff880428341708 Dec 12 10:02:58 desktop kernel: ffff8803c79c6f00 ffff88043fcc3ab7 0000000000000000 ffffffff810c5ab5 Dec 12 10:02:58 desktop kernel: Call Trace: Dec 12 10:02:58 desktop kernel: <IRQ> Dec 12 10:02:58 desktop kernel: [<ffffffff812b06cd>] ? dump_stack+0x46/0x59 Dec 12 10:02:58 desktop kernel: [<ffffffff8105134a>] ? __warn+0xba/0xe0 Dec 12 10:02:58 desktop kernel: [<ffffffff810c5ab5>] ? cgroup_get+0x55/0x70 Dec 12 10:02:58 desktop kernel: [<ffffffff814ff566>] ? sk_clone_lock+0x2d6/0x380 Dec 12 10:02:58 desktop kernel: [<ffffffff8155612c>] ? inet_csk_clone_lock+0xc/0xb0 Dec 12 10:02:58 desktop kernel: [<ffffffff8156fb79>] ? tcp_create_openreq_child+0x19/0x490 Dec 12 10:02:58 desktop kernel: [<ffffffff8156ddee>] ? tcp_v4_syn_recv_sock+0x3e/0x2e0 Dec 12 10:02:58 desktop kernel: [<ffffffff81570384>] ? tcp_check_req+0x394/0x4e0 Dec 12 10:02:58 desktop kernel: [<ffffffff8156ca2b>] ? tcp_v4_inbound_md5_hash+0x5b/0x1a0 Dec 12 10:02:58 desktop kernel: [<ffffffff8156f19b>] ? tcp_v4_rcv+0x49b/0xc40 Dec 12 10:02:58 desktop kernel: [<ffffffffa016d58a>] ? nf_nat_ipv4_fn+0x5a/0x1d0 [nf_nat_ipv4] Dec 12 10:02:58 desktop kernel: [<ffffffffa015e2ef>] ? ipv4_confirm+0x6f/0xe0 [nf_conntrack_ipv4] Dec 12 10:02:58 desktop kernel: [<ffffffff8154ac1f>] ? ip_local_deliver_finish+0x8f/0x1e0 Dec 12 10:02:58 desktop kernel: [<ffffffff8154b273>] ? ip_local_deliver+0x43/0x100 Dec 12 10:02:58 desktop kernel: [<ffffffff8154ab90>] ? inet_del_offload+0x30/0x30 Dec 12 10:02:58 desktop kernel: [<ffffffff8154b5b2>] ? ip_rcv+0x282/0x3a0 Dec 12 10:02:58 desktop kernel: [<ffffffff8154ad70>] ? ip_local_deliver_finish+0x1e0/0x1e0 Dec 12 10:02:58 desktop kernel: [<ffffffff81512333>] ? __netif_receive_skb_core+0x2a3/0x9f0 Dec 12 10:02:58 desktop kernel: [<ffffffff8151478f>] ? netif_receive_skb_internal+0x1f/0x90 Dec 12 10:02:58 desktop kernel: [<ffffffffa0116ec8>] ? br_pass_frame_up+0xa8/0x150 [bridge] Dec 12 10:02:58 desktop kernel: [<ffffffffa0116da0>] ? br_port_flags_change+0x10/0x10 [bridge] Dec 12 10:02:58 desktop kernel: [<ffffffffa0117131>] ? br_handle_frame_finish+0x1c1/0x4f0 [bridge] Dec 12 10:02:58 desktop kernel: [<ffffffffa0117601>] ? br_handle_frame+0x161/0x2f0 [bridge] Dec 12 10:02:58 desktop kernel: [<ffffffff815123ba>] ? __netif_receive_skb_core+0x32a/0x9f0 Dec 12 10:02:58 desktop kernel: [<ffffffff81078a94>] ? cpu_load_update+0xb4/0xc0 Dec 12 10:02:58 desktop kernel: [<ffffffff810a710f>] ? run_timer_softirq.part.23+0x8f/0xa0 Dec 12 10:02:58 desktop kernel: [<ffffffff81515e97>] ? process_backlog+0x97/0x130 Dec 12 10:02:58 desktop kernel: [<ffffffff81515cf7>] ? net_rx_action+0x1a7/0x2b0 Dec 12 10:02:58 desktop kernel: [<ffffffff81055963>] ? __do_softirq+0xd3/0x1c0 Dec 12 10:02:58 desktop kernel: [<ffffffff816060bc>] ? do_softirq_own_stack+0x1c/0x30 Dec 12 10:02:58 desktop kernel: <EOI> Dec 12 10:02:58 desktop kernel: [<ffffffff8105562a>] ? do_softirq.part.16+0x2a/0x30 Dec 12 10:02:58 desktop kernel: [<ffffffff81511fbc>] ? netif_rx_ni+0x3c/0x50 Dec 12 10:02:58 desktop kernel: [<ffffffff81444342>] ? tun_get_user+0x3f2/0x8e0 Dec 12 10:02:58 desktop kernel: [<ffffffffa01b6426>] ? translate_desc+0x76/0x150 [vhost] Dec 12 10:02:58 desktop kernel: [<ffffffffa01b70a7>] ? vhost_get_vq_desc+0x2d7/0x630 [vhost] Dec 12 10:02:58 desktop kernel: [<ffffffff8144486c>] ? tun_sendmsg+0x3c/0x60 Dec 12 10:02:58 desktop kernel: [<ffffffffa01c0777>] ? handle_tx+0x207/0x490 [vhost_net] Dec 12 10:02:58 desktop kernel: [<ffffffffa01b44b9>] ? vhost_worker+0x99/0xf0 [vhost] Dec 12 10:02:58 desktop kernel: [<ffffffffa01b4420>] ? vhost_dev_init+0x260/0x260 [vhost] Dec 12 10:02:58 desktop kernel: [<ffffffff81002536>] ? do_syscall_64+0x56/0x160 Dec 12 10:02:58 desktop kernel: [<ffffffff810550bb>] ? SyS_exit_group+0xb/0x10 Dec 12 10:02:58 desktop kernel: [<ffffffff8106b1c9>] ? kthread+0xb9/0xd0 Dec 12 10:02:58 desktop kernel: [<ffffffff8106b110>] ? kthread_park+0x50/0x50 Dec 12 10:02:58 desktop kernel: [<ffffffff81604ea2>] ? ret_from_fork+0x22/0x30 Dec 12 10:02:58 desktop kernel: ---[ end trace d8a0c3bc226461ef ]--- Thanks for your time, your work and your attention. Kind regards, Jesús Rodríguez Acosta -- http://es.linkedin.com/in/jesusrodriguezacosta (+34) 653 79 09 64 IMPORTANTE: Este mensaje de correo está destinado únicamente a la persona o entidad a la cual se dirige y puede contener información privilegiada, confidencial y/o de acceso restringido según la legislación vigente. Si usted no es el destinatario indicado, por la presente queda informado de que cualquier uso, distribución o copia de la comunicación está estrictamente prohibido. Si usted ha recibido esta comunicación por error, por favor, avíseme de inmediato. Gracias. 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