[ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. Starting Load/Save RF Kill Switch Status... [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.15.217' (ECDSA) to the list of known hosts. 2020/04/01 07:41:37 fuzzer started 2020/04/01 07:41:39 connecting to host at 10.128.0.26:45941 2020/04/01 07:41:39 checking machine... 2020/04/01 07:41:39 checking revisions... 2020/04/01 07:41:39 testing simple program... syzkaller login: [ 61.438896][ T7068] IPVS: ftp: loaded support on port[0] = 21 2020/04/01 07:41:40 building call list... [ 61.637073][ T379] [ 61.639558][ T379] ============================= [ 61.644402][ T379] WARNING: suspicious RCU usage [ 61.669850][ T379] 5.6.0-next-20200401-syzkaller #0 Not tainted [ 61.696061][ T379] ----------------------------- [ 61.700952][ T379] net/openvswitch/conntrack.c:1898 RCU-list traversed in non-reader section!! [ 61.736045][ T379] [ 61.736045][ T379] other info that might help us debug this: [ 61.736045][ T379] [ 61.761708][ T379] [ 61.761708][ T379] rcu_scheduler_active = 2, debug_locks = 1 [ 61.786076][ T379] 3 locks held by kworker/u4:5/379: [ 61.791648][ T379] #0: ffff8880a977e138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 [ 61.806285][ T379] #1: ffffc90002257dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 [ 61.817701][ T379] #2: ffffffff8a56f970 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50 [ 61.827235][ T379] [ 61.827235][ T379] stack backtrace: [ 61.833230][ T379] CPU: 0 PID: 379 Comm: kworker/u4:5 Not tainted 5.6.0-next-20200401-syzkaller #0 [ 61.842415][ T379] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.852486][ T379] Workqueue: netns cleanup_net [ 61.857253][ T379] Call Trace: [ 61.860549][ T379] dump_stack+0x188/0x20d [ 61.864891][ T379] ovs_ct_exit+0x3db/0x558 [ 61.869338][ T379] ovs_exit_net+0x1df/0xba0 [ 61.873854][ T379] ? synchronize_rcu.part.0+0xda/0xf0 [ 61.879233][ T379] ? synchronize_rcu_expedited+0x620/0x620 [ 61.885075][ T379] ? ovs_dp_cmd_del+0x270/0x270 [ 61.889990][ T379] ? ovs_dp_cmd_del+0x270/0x270 [ 61.894855][ T379] ops_exit_list.isra.0+0xa8/0x150 [ 61.899995][ T379] cleanup_net+0x511/0xa50 [ 61.904471][ T379] ? unregister_pernet_device+0x70/0x70 [ 61.910031][ T379] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 61.916019][ T379] ? _raw_spin_unlock_irq+0x1f/0x80 [ 61.921221][ T379] process_one_work+0x965/0x16a0 [ 61.926174][ T379] ? lock_release+0x800/0x800 [ 61.930844][ T379] ? pwq_dec_nr_in_flight+0x310/0x310 [ 61.936217][ T379] ? rwlock_bug.part.0+0x90/0x90 [ 61.941161][ T379] worker_thread+0x96/0xe20 [ 61.945684][ T379] ? process_one_work+0x16a0/0x16a0 [ 61.950903][ T379] kthread+0x388/0x470 [ 61.954973][ T379] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 61.960703][ T379] ret_from_fork+0x24/0x30 [ 62.156097][ T379] tipc: TX() has been purged, node left! [ 62.207807][ T379] [ 62.210345][ T379] ============================= [ 62.215184][ T379] WARNING: suspicious RCU usage [ 62.221922][ T379] 5.6.0-next-20200401-syzkaller #0 Not tainted [ 62.229009][ T379] ----------------------------- [ 62.234121][ T379] net/ipv4/ipmr.c:1757 RCU-list traversed in non-reader section!! [ 62.256018][ T379] [ 62.256018][ T379] other info that might help us debug this: [ 62.256018][ T379] [ 62.267535][ T379] [ 62.267535][ T379] rcu_scheduler_active = 2, debug_locks = 1 [ 62.275710][ T379] 4 locks held by kworker/u4:5/379: [ 62.282546][ T379] #0: ffff8880a977e138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 [ 62.293930][ T379] #1: ffffc90002257dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 [ 62.304961][ T379] #2: ffffffff8a56f970 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50 [ 62.315408][ T379] #3: ffffffff8a57b8e8 (rtnl_mutex){+.+.}-{3:3}, at: ip6gre_exit_batch_net+0x88/0x700 [ 62.326359][ T379] [ 62.326359][ T379] stack backtrace: [ 62.332327][ T379] CPU: 0 PID: 379 Comm: kworker/u4:5 Not tainted 5.6.0-next-20200401-syzkaller #0 [ 62.341518][ T379] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.351590][ T379] Workqueue: netns cleanup_net [ 62.356352][ T379] Call Trace: [ 62.359644][ T379] dump_stack+0x188/0x20d [ 62.363985][ T379] ipmr_device_event+0x240/0x2b0 [ 62.368930][ T379] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 62.374937][ T379] notifier_call_chain+0xc0/0x230 [ 62.379981][ T379] call_netdevice_notifiers_info+0xb5/0x130 [ 62.385884][ T379] rollback_registered_many+0x75c/0xe70 [ 62.391443][ T379] ? netif_set_real_num_tx_queues+0x700/0x700 [ 62.397527][ T379] ? lock_downgrade+0x840/0x840 [ 62.402398][ T379] unregister_netdevice_many.part.0+0x16/0x1e0 [ 62.408558][ T379] unregister_netdevice_many+0x36/0x50 [ 62.414023][ T379] ip6gre_exit_batch_net+0x4e8/0x700 [ 62.419354][ T379] ? ip6gre_tunnel_link+0xf0/0xf0 [ 62.424382][ T379] ? rcu_read_lock_held_common+0x130/0x130 [ 62.430201][ T379] ? ip6gre_tunnel_link+0xf0/0xf0 [ 62.435228][ T379] ops_exit_list.isra.0+0x103/0x150 [ 62.440438][ T379] cleanup_net+0x511/0xa50 [ 62.444866][ T379] ? unregister_pernet_device+0x70/0x70 [ 62.450425][ T379] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.456415][ T379] ? _raw_spin_unlock_irq+0x1f/0x80 [ 62.461648][ T379] process_one_work+0x965/0x16a0 [ 62.466640][ T379] ? lock_release+0x800/0x800 [ 62.471336][ T379] ? pwq_dec_nr_in_flight+0x310/0x310 [ 62.476722][ T379] ? rwlock_bug.part.0+0x90/0x90 [ 62.481691][ T379] worker_thread+0x96/0xe20 [ 62.486223][ T379] ? process_one_work+0x16a0/0x16a0 [ 62.491431][ T379] kthread+0x388/0x470 [ 62.495511][ T379] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.501241][ T379] ret_from_fork+0x24/0x30 [ 63.503075][ T7053] can: request_module (can-proto-0) failed. executing program [ 65.660211][ T7053] can: request_module (can-proto-0) failed. [ 65.674599][ T7053] can: request_module (can-proto-0) failed.