Warning: Permanently added '10.128.10.22' (ECDSA) to the list of known hosts. 2020/03/23 10:49:06 fuzzer started 2020/03/23 10:49:07 connecting to host at 10.128.0.26:43043 2020/03/23 10:49:07 checking machine... 2020/03/23 10:49:07 checking revisions... 2020/03/23 10:49:07 testing simple program... syzkaller login: [ 85.179514][ T9559] IPVS: ftp: loaded support on port[0] = 21 2020/03/23 10:49:07 building call list... [ 85.361728][ T7] [ 85.364233][ T7] ============================= [ 85.369259][ T7] WARNING: suspicious RCU usage [ 85.391240][ T7] 5.6.0-rc7-next-20200323-syzkaller #0 Not tainted [ 85.397789][ T7] ----------------------------- [ 85.409834][ T7] net/openvswitch/conntrack.c:1898 RCU-list traversed in non-reader section!! [ 85.420692][ T7] [ 85.420692][ T7] other info that might help us debug this: [ 85.420692][ T7] [ 85.446768][ T7] [ 85.446768][ T7] rcu_scheduler_active = 2, debug_locks = 1 [ 85.455251][ T7] 3 locks held by kworker/u4:0/7: [ 85.460707][ T7] #0: ffff88821b78d928 ((wq_completion)netns){+.+.}, at: process_one_work+0x82a/0x1690 [ 85.471917][ T7] #1: ffffc90000cdfdd0 (net_cleanup_work){+.+.}, at: process_one_work+0x85e/0x1690 [ 85.481380][ T7] #2: ffffffff8a55ec88 (pernet_ops_rwsem){++++}, at: cleanup_net+0x9b/0xa50 [ 85.490412][ T7] [ 85.490412][ T7] stack backtrace: [ 85.496454][ T7] CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 5.6.0-rc7-next-20200323-syzkaller #0 [ 85.505845][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 85.515904][ T7] Workqueue: netns cleanup_net [ 85.520689][ T7] Call Trace: [ 85.523991][ T7] dump_stack+0x188/0x20d [ 85.528340][ T7] ovs_ct_exit+0x3db/0x558 [ 85.532762][ T7] ovs_exit_net+0x1df/0xba0 [ 85.537267][ T7] ? ovs_dp_cmd_del+0x270/0x270 [ 85.542132][ T7] ? __mutex_unlock_slowpath+0xe2/0x660 [ 85.547714][ T7] ? ovs_dp_cmd_del+0x270/0x270 [ 85.552577][ T7] ops_exit_list.isra.0+0xa8/0x150 [ 85.557707][ T7] cleanup_net+0x511/0xa50 [ 85.562129][ T7] ? unregister_pernet_device+0x70/0x70 [ 85.567682][ T7] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 85.573670][ T7] process_one_work+0x94b/0x1690 [ 85.578626][ T7] ? pwq_dec_nr_in_flight+0x310/0x310 [ 85.584003][ T7] ? do_raw_spin_lock+0x129/0x2e0 [ 85.589051][ T7] worker_thread+0x96/0xe20 [ 85.593571][ T7] ? process_one_work+0x1690/0x1690 [ 85.599220][ T7] kthread+0x357/0x430 [ 85.603288][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 85.609015][ T7] ret_from_fork+0x24/0x30 [ 85.781333][ T7] tipc: TX() has been purged, node left! [ 85.823316][ T7] [ 85.825792][ T7] ============================= [ 85.830650][ T7] WARNING: suspicious RCU usage [ 85.836114][ T7] 5.6.0-rc7-next-20200323-syzkaller #0 Not tainted [ 85.843145][ T7] ----------------------------- [ 85.848056][ T7] net/ipv4/ipmr.c:1757 RCU-list traversed in non-reader section!! [ 85.856408][ T7] [ 85.856408][ T7] other info that might help us debug this: [ 85.856408][ T7] [ 85.867394][ T7] [ 85.867394][ T7] rcu_scheduler_active = 2, debug_locks = 1 [ 85.876064][ T7] 4 locks held by kworker/u4:0/7: [ 85.881150][ T7] #0: ffff88821b78d928 ((wq_completion)netns){+.+.}, at: process_one_work+0x82a/0x1690 [ 85.891568][ T7] #1: ffffc90000cdfdd0 (net_cleanup_work){+.+.}, at: process_one_work+0x85e/0x1690 [ 85.901855][ T7] #2: ffffffff8a55ec88 (pernet_ops_rwsem){++++}, at: cleanup_net+0x9b/0xa50 [ 85.910901][ T7] #3: ffffffff8a56aa00 (rtnl_mutex){+.+.}, at: ip6gre_exit_batch_net+0x88/0x700 [ 85.920725][ T7] [ 85.920725][ T7] stack backtrace: [ 85.927558][ T7] CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 5.6.0-rc7-next-20200323-syzkaller #0 [ 85.936924][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 85.946986][ T7] Workqueue: netns cleanup_net [ 85.952117][ T7] Call Trace: [ 85.955417][ T7] dump_stack+0x188/0x20d [ 85.959753][ T7] ipmr_device_event+0x240/0x2b0 [ 85.964693][ T7] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 85.970589][ T7] notifier_call_chain+0xc0/0x230 [ 85.975628][ T7] call_netdevice_notifiers_info+0xb5/0x130 [ 85.981518][ T7] rollback_registered_many+0x75c/0xe70 [ 85.987064][ T7] ? netif_set_real_num_tx_queues+0x700/0x700 [ 85.993147][ T7] ? lock_downgrade+0x7f0/0x7f0 [ 85.998021][ T7] unregister_netdevice_many.part.0+0x16/0x1e0 [ 86.004199][ T7] unregister_netdevice_many+0x36/0x50 [ 86.009659][ T7] ip6gre_exit_batch_net+0x4e8/0x700 [ 86.014946][ T7] ? ip6gre_tunnel_link+0xf0/0xf0 [ 86.019981][ T7] ? rcu_read_lock_held_common+0x130/0x130 [ 86.025786][ T7] ? ip6gre_tunnel_link+0xf0/0xf0 [ 86.030821][ T7] ops_exit_list.isra.0+0x103/0x150 [ 86.036022][ T7] cleanup_net+0x511/0xa50 [ 86.040438][ T7] ? unregister_pernet_device+0x70/0x70 [ 86.045995][ T7] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 86.051987][ T7] process_one_work+0x94b/0x1690 [ 86.056931][ T7] ? pwq_dec_nr_in_flight+0x310/0x310 [ 86.062384][ T7] ? do_raw_spin_lock+0x129/0x2e0 [ 86.067418][ T7] worker_thread+0x96/0xe20 [ 86.071934][ T7] ? process_one_work+0x1690/0x1690 [ 86.077226][ T7] kthread+0x357/0x430 [ 86.081303][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 86.087023][ T7] ret_from_fork+0x24/0x30 [ 86.864509][ T9545] can: request_module (can-proto-0) failed. executing program [ 89.100956][ T9545] can: request_module (can-proto-0) failed. [ 89.113244][ T9545] can: request_module (can-proto-0) failed.