Warning: Permanently added '10.128.0.126' (ECDSA) to the list of known hosts. 2020/03/24 08:42:02 fuzzer started 2020/03/24 08:42:04 connecting to host at 10.128.0.26:34655 2020/03/24 08:42:04 checking machine... 2020/03/24 08:42:04 checking revisions... 2020/03/24 08:42:04 testing simple program... syzkaller login: [ 87.648097][ T9964] IPVS: ftp: loaded support on port[0] = 21 2020/03/24 08:42:04 building call list... [ 87.876500][ T35] [ 87.879262][ T35] ============================= [ 87.891233][ T35] WARNING: suspicious RCU usage [ 87.910794][ T35] 5.6.0-rc7-next-20200324-syzkaller #0 Not tainted [ 87.917660][ T35] ----------------------------- [ 87.922526][ T35] net/openvswitch/conntrack.c:1898 RCU-list traversed in non-reader section!! [ 87.942381][ T35] [ 87.942381][ T35] other info that might help us debug this: [ 87.942381][ T35] [ 87.954308][ T35] [ 87.954308][ T35] rcu_scheduler_active = 2, debug_locks = 1 [ 87.962496][ T35] 3 locks held by kworker/u4:2/35: [ 87.968047][ T35] #0: ffff88821b78d928 ((wq_completion)netns){+.+.}, at: process_one_work+0x82a/0x1690 [ 87.978064][ T35] #1: ffffc90000ea7dd0 (net_cleanup_work){+.+.}, at: process_one_work+0x85e/0x1690 [ 87.987911][ T35] #2: ffffffff8a55f388 (pernet_ops_rwsem){++++}, at: cleanup_net+0x9b/0xa50 [ 88.000324][ T35] [ 88.000324][ T35] stack backtrace: [ 88.022951][ T35] CPU: 0 PID: 35 Comm: kworker/u4:2 Not tainted 5.6.0-rc7-next-20200324-syzkaller #0 [ 88.032573][ T35] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 88.042630][ T35] Workqueue: netns cleanup_net [ 88.047391][ T35] Call Trace: [ 88.050688][ T35] dump_stack+0x188/0x20d [ 88.055041][ T35] ovs_ct_exit+0x3db/0x558 [ 88.059469][ T35] ovs_exit_net+0x1df/0xba0 [ 88.063984][ T35] ? ovs_dp_cmd_del+0x270/0x270 [ 88.068831][ T35] ? __mutex_unlock_slowpath+0xe2/0x660 [ 88.074380][ T35] ? ovs_dp_cmd_del+0x270/0x270 [ 88.079233][ T35] ops_exit_list.isra.0+0xa8/0x150 [ 88.084348][ T35] cleanup_net+0x511/0xa50 [ 88.088768][ T35] ? unregister_pernet_device+0x70/0x70 [ 88.094328][ T35] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 88.100323][ T35] process_one_work+0x94b/0x1690 [ 88.105292][ T35] ? pwq_dec_nr_in_flight+0x310/0x310 [ 88.110698][ T35] ? do_raw_spin_lock+0x129/0x2e0 [ 88.115752][ T35] worker_thread+0x96/0xe20 [ 88.120278][ T35] ? process_one_work+0x1690/0x1690 [ 88.125483][ T35] kthread+0x357/0x430 [ 88.129556][ T35] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 88.135280][ T35] ret_from_fork+0x24/0x30 [ 88.332982][ T35] tipc: TX() has been purged, node left! [ 88.374978][ T35] [ 88.377426][ T35] ============================= [ 88.382266][ T35] WARNING: suspicious RCU usage [ 88.387632][ T35] 5.6.0-rc7-next-20200324-syzkaller #0 Not tainted [ 88.395555][ T35] ----------------------------- [ 88.400451][ T35] net/ipv4/ipmr.c:1757 RCU-list traversed in non-reader section!! [ 88.409623][ T35] [ 88.409623][ T35] other info that might help us debug this: [ 88.409623][ T35] [ 88.420560][ T35] [ 88.420560][ T35] rcu_scheduler_active = 2, debug_locks = 1 [ 88.439513][ T35] 4 locks held by kworker/u4:2/35: [ 88.445981][ T35] #0: ffff88821b78d928 ((wq_completion)netns){+.+.}, at: process_one_work+0x82a/0x1690 [ 88.456447][ T35] #1: ffffc90000ea7dd0 (net_cleanup_work){+.+.}, at: process_one_work+0x85e/0x1690 [ 88.466354][ T35] #2: ffffffff8a55f388 (pernet_ops_rwsem){++++}, at: cleanup_net+0x9b/0xa50 [ 88.475990][ T35] #3: ffffffff8a56b100 (rtnl_mutex){+.+.}, at: ip6gre_exit_batch_net+0x88/0x700 [ 88.485621][ T35] [ 88.485621][ T35] stack backtrace: [ 88.491625][ T35] CPU: 0 PID: 35 Comm: kworker/u4:2 Not tainted 5.6.0-rc7-next-20200324-syzkaller #0 [ 88.501084][ T35] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 88.511148][ T35] Workqueue: netns cleanup_net [ 88.515934][ T35] Call Trace: [ 88.519239][ T35] dump_stack+0x188/0x20d [ 88.523575][ T35] ipmr_device_event+0x240/0x2b0 [ 88.528523][ T35] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 88.534419][ T35] notifier_call_chain+0xc0/0x230 [ 88.539453][ T35] call_netdevice_notifiers_info+0xb5/0x130 [ 88.545347][ T35] rollback_registered_many+0x75c/0xe70 [ 88.550897][ T35] ? netif_set_real_num_tx_queues+0x700/0x700 [ 88.556970][ T35] ? lock_downgrade+0x7f0/0x7f0 [ 88.561827][ T35] unregister_netdevice_many.part.0+0x16/0x1e0 [ 88.567995][ T35] unregister_netdevice_many+0x36/0x50 [ 88.575364][ T35] ip6gre_exit_batch_net+0x4e8/0x700 [ 88.580678][ T35] ? ip6gre_tunnel_link+0xf0/0xf0 [ 88.585706][ T35] ? rcu_read_lock_held_common+0x130/0x130 [ 88.591523][ T35] ? ip6gre_tunnel_link+0xf0/0xf0 [ 88.596547][ T35] ops_exit_list.isra.0+0x103/0x150 [ 88.601745][ T35] cleanup_net+0x511/0xa50 [ 88.606161][ T35] ? unregister_pernet_device+0x70/0x70 [ 88.611718][ T35] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 88.617700][ T35] process_one_work+0x94b/0x1690 [ 88.622645][ T35] ? pwq_dec_nr_in_flight+0x310/0x310 [ 88.628030][ T35] ? do_raw_spin_lock+0x129/0x2e0 [ 88.633066][ T35] worker_thread+0x96/0xe20 [ 88.637578][ T35] ? process_one_work+0x1690/0x1690 [ 88.642777][ T35] kthread+0x357/0x430 [ 88.646849][ T35] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 88.652578][ T35] ret_from_fork+0x24/0x30 [ 89.475739][ T9951] can: request_module (can-proto-0) failed. executing program [ 91.703670][ T9951] can: request_module (can-proto-0) failed. [ 91.716233][ T9951] can: request_module (can-proto-0) failed.