[ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ 46.434074][ T6607] sshd (6607) used greatest stack depth: 23328 bytes left Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.223' (ECDSA) to the list of known hosts. 2020/04/19 23:30:59 fuzzer started 2020/04/19 23:31:01 connecting to host at 10.128.0.26:35465 2020/04/19 23:31:01 checking machine... 2020/04/19 23:31:01 checking revisions... 2020/04/19 23:31:01 testing simple program... syzkaller login: [ 59.461483][ T6867] IPVS: ftp: loaded support on port[0] = 21 2020/04/19 23:31:01 building call list... [ 59.694994][ T227] [ 59.697474][ T227] ============================= [ 59.705369][ T227] WARNING: suspicious RCU usage [ 59.710382][ T227] 5.7.0-rc1-next-20200417-syzkaller #0 Not tainted [ 59.734650][ T227] ----------------------------- [ 59.739563][ T227] net/openvswitch/conntrack.c:1898 RCU-list traversed in non-reader section!! [ 59.752616][ T227] [ 59.752616][ T227] other info that might help us debug this: [ 59.752616][ T227] [ 59.763560][ T227] [ 59.763560][ T227] rcu_scheduler_active = 2, debug_locks = 1 [ 59.772493][ T227] 3 locks held by kworker/u4:3/227: [ 59.778283][ T227] #0: ffff8880a977a138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 [ 59.789304][ T227] #1: ffffc90000e87dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 [ 59.799831][ T227] #2: ffffffff8a5a08f0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50 [ 59.814557][ T227] [ 59.814557][ T227] stack backtrace: [ 59.820621][ T227] CPU: 0 PID: 227 Comm: kworker/u4:3 Not tainted 5.7.0-rc1-next-20200417-syzkaller #0 [ 59.830155][ T227] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.840217][ T227] Workqueue: netns cleanup_net [ 59.844980][ T227] Call Trace: [ 59.848265][ T227] dump_stack+0x188/0x20d [ 59.852603][ T227] ovs_ct_exit+0x3db/0x558 [ 59.857152][ T227] ovs_exit_net+0x1df/0xba0 [ 59.861665][ T227] ? synchronize_rcu.part.0+0xda/0xf0 [ 59.867137][ T227] ? synchronize_rcu_expedited+0x620/0x620 [ 59.872961][ T227] ? ovs_dp_cmd_del+0x270/0x270 [ 59.877816][ T227] ? ovs_dp_cmd_del+0x270/0x270 [ 59.882670][ T227] ops_exit_list.isra.0+0xa8/0x150 [ 59.887790][ T227] cleanup_net+0x511/0xa50 [ 59.892232][ T227] ? unregister_pernet_device+0x70/0x70 [ 59.897785][ T227] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 59.903769][ T227] ? _raw_spin_unlock_irq+0x1f/0x80 [ 59.908985][ T227] process_one_work+0x965/0x16a0 [ 59.913945][ T227] ? lock_release+0x800/0x800 [ 59.918660][ T227] ? pwq_dec_nr_in_flight+0x310/0x310 [ 59.924088][ T227] ? rwlock_bug.part.0+0x90/0x90 [ 59.929049][ T227] worker_thread+0x96/0xe20 [ 59.933564][ T227] ? process_one_work+0x16a0/0x16a0 [ 59.938770][ T227] kthread+0x388/0x470 [ 59.942878][ T227] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 59.948612][ T227] ret_from_fork+0x24/0x30 [ 60.114537][ T227] tipc: TX() has been purged, node left! [ 60.156905][ T227] [ 60.159344][ T227] ============================= [ 60.164193][ T227] WARNING: suspicious RCU usage [ 60.169660][ T227] 5.7.0-rc1-next-20200417-syzkaller #0 Not tainted [ 60.194644][ T227] ----------------------------- [ 60.199555][ T227] net/ipv4/ipmr.c:1757 RCU-list traversed in non-reader section!! [ 60.224407][ T227] [ 60.224407][ T227] other info that might help us debug this: [ 60.224407][ T227] [ 60.234879][ T227] [ 60.234879][ T227] rcu_scheduler_active = 2, debug_locks = 1 [ 60.242957][ T227] 4 locks held by kworker/u4:3/227: [ 60.248297][ T227] #0: ffff8880a977a138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 [ 60.259005][ T227] #1: ffffc90000e87dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 [ 60.269668][ T227] #2: ffffffff8a5a08f0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50 [ 60.279172][ T227] #3: ffffffff8a5ac868 (rtnl_mutex){+.+.}-{3:3}, at: ip6gre_exit_batch_net+0x88/0x700 [ 60.289193][ T227] [ 60.289193][ T227] stack backtrace: [ 60.295281][ T227] CPU: 0 PID: 227 Comm: kworker/u4:3 Not tainted 5.7.0-rc1-next-20200417-syzkaller #0 [ 60.304830][ T227] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.314904][ T227] Workqueue: netns cleanup_net [ 60.319674][ T227] Call Trace: [ 60.322976][ T227] dump_stack+0x188/0x20d [ 60.327398][ T227] ipmr_device_event+0x240/0x2b0 [ 60.332334][ T227] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 60.338237][ T227] notifier_call_chain+0xc0/0x230 [ 60.343273][ T227] call_netdevice_notifiers_info+0xb5/0x130 [ 60.349168][ T227] rollback_registered_many+0x75c/0xe70 [ 60.354726][ T227] ? netif_set_real_num_tx_queues+0x700/0x700 [ 60.360803][ T227] ? lock_downgrade+0x840/0x840 [ 60.365670][ T227] unregister_netdevice_many.part.0+0x16/0x1e0 [ 60.371822][ T227] unregister_netdevice_many+0x36/0x50 [ 60.377278][ T227] ip6gre_exit_batch_net+0x4e8/0x700 [ 60.382563][ T227] ? ip6gre_tunnel_link+0xf0/0xf0 [ 60.387584][ T227] ? rcu_read_lock_held_common+0x130/0x130 [ 60.393391][ T227] ? ip6gre_tunnel_link+0xf0/0xf0 [ 60.398419][ T227] ops_exit_list.isra.0+0x103/0x150 [ 60.403619][ T227] cleanup_net+0x511/0xa50 [ 60.408041][ T227] ? unregister_pernet_device+0x70/0x70 [ 60.413598][ T227] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 60.419645][ T227] ? _raw_spin_unlock_irq+0x1f/0x80 [ 60.424854][ T227] process_one_work+0x965/0x16a0 [ 60.429828][ T227] ? lock_release+0x800/0x800 [ 60.434617][ T227] ? pwq_dec_nr_in_flight+0x310/0x310 [ 60.439995][ T227] ? rwlock_bug.part.0+0x90/0x90 [ 60.444946][ T227] worker_thread+0x96/0xe20 [ 60.449466][ T227] ? process_one_work+0x16a0/0x16a0 [ 60.454680][ T227] kthread+0x388/0x470 [ 60.458758][ T227] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 60.464481][ T227] ret_from_fork+0x24/0x30 [ 61.301144][ T6852] can: request_module (can-proto-0) failed. executing program [ 63.670015][ T6852] can: request_module (can-proto-0) failed. [ 63.681279][ T6852] can: request_module (can-proto-0) failed.