Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.240' (ECDSA) to the list of known hosts. 2020/04/20 11:33:58 fuzzer started 2020/04/20 11:34:00 connecting to host at 10.128.0.26:38217 2020/04/20 11:34:00 checking machine... 2020/04/20 11:34:00 checking revisions... 2020/04/20 11:34:00 testing simple program... syzkaller login: [ 65.764580][ T6867] IPVS: ftp: loaded support on port[0] = 21 2020/04/20 11:34:00 building call list... [ 65.964268][ T6802] [ 65.966835][ T6802] ============================= [ 65.971683][ T6802] WARNING: suspicious RCU usage [ 65.985585][ T6802] 5.7.0-rc2-next-20200420-syzkaller #0 Not tainted [ 65.992380][ T6802] ----------------------------- [ 66.013443][ T6802] net/openvswitch/conntrack.c:1898 RCU-list traversed in non-reader section!! [ 66.031429][ T6802] [ 66.031429][ T6802] other info that might help us debug this: [ 66.031429][ T6802] [ 66.053875][ T6802] [ 66.053875][ T6802] rcu_scheduler_active = 2, debug_locks = 1 [ 66.077665][ T6802] 3 locks held by kworker/u4:8/6802: [ 66.097445][ T6802] #0: ffff8880a9772138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 [ 66.108487][ T6802] #1: ffffc900017c7dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 [ 66.119131][ T6802] #2: ffffffff8a5a26f0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50 [ 66.128813][ T6802] [ 66.128813][ T6802] stack backtrace: [ 66.134896][ T6802] CPU: 0 PID: 6802 Comm: kworker/u4:8 Not tainted 5.7.0-rc2-next-20200420-syzkaller #0 [ 66.144960][ T6802] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.155050][ T6802] Workqueue: netns cleanup_net [ 66.159813][ T6802] Call Trace: [ 66.163106][ T6802] dump_stack+0x188/0x20d [ 66.167461][ T6802] ovs_ct_exit+0x3db/0x558 [ 66.171900][ T6802] ovs_exit_net+0x1df/0xba0 [ 66.176410][ T6802] ? synchronize_rcu.part.0+0xda/0xf0 [ 66.181785][ T6802] ? synchronize_rcu_expedited+0x620/0x620 [ 66.187602][ T6802] ? ovs_dp_cmd_del+0x270/0x270 [ 66.192522][ T6802] ? ovs_dp_cmd_del+0x270/0x270 [ 66.197411][ T6802] ops_exit_list.isra.0+0xa8/0x150 [ 66.202543][ T6802] cleanup_net+0x511/0xa50 [ 66.206990][ T6802] ? unregister_pernet_device+0x70/0x70 [ 66.212564][ T6802] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 66.218566][ T6802] ? _raw_spin_unlock_irq+0x1f/0x80 [ 66.223777][ T6802] process_one_work+0x965/0x16a0 [ 66.228733][ T6802] ? lock_release+0x800/0x800 [ 66.233525][ T6802] ? pwq_dec_nr_in_flight+0x310/0x310 [ 66.238912][ T6802] ? rwlock_bug.part.0+0x90/0x90 [ 66.243879][ T6802] worker_thread+0x96/0xe20 [ 66.248419][ T6802] ? process_one_work+0x16a0/0x16a0 [ 66.254414][ T6802] kthread+0x38b/0x470 [ 66.258491][ T6802] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 66.264219][ T6802] ret_from_fork+0x24/0x30 [ 66.463677][ T6802] tipc: TX() has been purged, node left! [ 66.505924][ T6802] [ 66.508384][ T6802] ============================= [ 66.513246][ T6802] WARNING: suspicious RCU usage [ 66.519923][ T6802] 5.7.0-rc2-next-20200420-syzkaller #0 Not tainted [ 66.528435][ T6802] ----------------------------- [ 66.533359][ T6802] net/ipv4/ipmr.c:1757 RCU-list traversed in non-reader section!! [ 66.542723][ T6802] [ 66.542723][ T6802] other info that might help us debug this: [ 66.542723][ T6802] [ 66.554120][ T6802] [ 66.554120][ T6802] rcu_scheduler_active = 2, debug_locks = 1 [ 66.562269][ T6802] 4 locks held by kworker/u4:8/6802: [ 66.569869][ T6802] #0: ffff8880a9772138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 [ 66.581360][ T6802] #1: ffffc900017c7dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 [ 66.592761][ T6802] #2: ffffffff8a5a26f0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50 [ 66.603175][ T6802] #3: ffffffff8a5ae668 (rtnl_mutex){+.+.}-{3:3}, at: ip6gre_exit_batch_net+0x88/0x700 [ 66.614040][ T6802] [ 66.614040][ T6802] stack backtrace: [ 66.620022][ T6802] CPU: 0 PID: 6802 Comm: kworker/u4:8 Not tainted 5.7.0-rc2-next-20200420-syzkaller #0 [ 66.632001][ T6802] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.642071][ T6802] Workqueue: netns cleanup_net [ 66.646830][ T6802] Call Trace: [ 66.650138][ T6802] dump_stack+0x188/0x20d [ 66.654490][ T6802] ipmr_device_event+0x240/0x2b0 [ 66.659446][ T6802] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 66.665375][ T6802] notifier_call_chain+0xc0/0x230 [ 66.670432][ T6802] call_netdevice_notifiers_info+0xb5/0x130 [ 66.676348][ T6802] rollback_registered_many+0x75c/0xe70 [ 66.681922][ T6802] ? netif_set_real_num_tx_queues+0x700/0x700 [ 66.688005][ T6802] ? lock_downgrade+0x840/0x840 [ 66.692866][ T6802] unregister_netdevice_many.part.0+0x16/0x1e0 [ 66.699552][ T6802] unregister_netdevice_many+0x36/0x50 [ 66.705016][ T6802] ip6gre_exit_batch_net+0x4e8/0x700 [ 66.710320][ T6802] ? ip6gre_tunnel_link+0xf0/0xf0 [ 66.715362][ T6802] ? rcu_read_lock_held_common+0x130/0x130 [ 66.721175][ T6802] ? ip6gre_tunnel_link+0xf0/0xf0 [ 66.726333][ T6802] ops_exit_list.isra.0+0x103/0x150 [ 66.731549][ T6802] cleanup_net+0x511/0xa50 [ 66.735988][ T6802] ? unregister_pernet_device+0x70/0x70 [ 66.741740][ T6802] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 66.747726][ T6802] ? _raw_spin_unlock_irq+0x1f/0x80 [ 66.752954][ T6802] process_one_work+0x965/0x16a0 [ 66.757907][ T6802] ? lock_release+0x800/0x800 [ 66.762595][ T6802] ? pwq_dec_nr_in_flight+0x310/0x310 [ 66.767976][ T6802] ? rwlock_bug.part.0+0x90/0x90 [ 66.773043][ T6802] worker_thread+0x96/0xe20 [ 66.777600][ T6802] ? process_one_work+0x16a0/0x16a0 [ 66.782950][ T6802] kthread+0x38b/0x470 [ 66.787035][ T6802] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 66.792766][ T6802] ret_from_fork+0x24/0x30 [ 67.838428][ T6895] can: request_module (can-proto-0) failed. executing program [ 69.901252][ T6895] can: request_module (can-proto-0) failed. [ 69.913079][ T6895] can: request_module (can-proto-0) failed.