[ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ 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 ] Started System Logging Service. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.33' (ECDSA) to the list of known hosts. 2020/03/27 05:20:37 fuzzer started 2020/03/27 05:20:39 connecting to host at 10.128.0.26:46063 2020/03/27 05:20:39 checking machine... 2020/03/27 05:20:39 checking revisions... 2020/03/27 05:20:39 testing simple program... syzkaller login: [ 65.126531][ T7060] IPVS: ftp: loaded support on port[0] = 21 2020/03/27 05:20:39 building call list... [ 65.356079][ T88] [ 65.358607][ T88] ============================= [ 65.363459][ T88] WARNING: suspicious RCU usage [ 65.384837][ T88] 5.6.0-rc7-next-20200326-syzkaller #0 Not tainted [ 65.391382][ T88] ----------------------------- [ 65.415132][ T88] net/openvswitch/conntrack.c:1898 RCU-list traversed in non-reader section!! [ 65.424021][ T88] [ 65.424021][ T88] other info that might help us debug this: [ 65.424021][ T88] [ 65.454801][ T88] [ 65.454801][ T88] rcu_scheduler_active = 2, debug_locks = 1 [ 65.462904][ T88] 3 locks held by kworker/u4:3/88: [ 65.479119][ T88] #0: ffff8880a977e138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 [ 65.490628][ T88] #1: ffffc90000f17dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 [ 65.501758][ T88] #2: ffffffff8a56cd30 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50 [ 65.512108][ T88] [ 65.512108][ T88] stack backtrace: [ 65.519294][ T88] CPU: 0 PID: 88 Comm: kworker/u4:3 Not tainted 5.6.0-rc7-next-20200326-syzkaller #0 [ 65.528879][ T88] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.538965][ T88] Workqueue: netns cleanup_net [ 65.543753][ T88] Call Trace: [ 65.547070][ T88] dump_stack+0x188/0x20d [ 65.551432][ T88] ovs_ct_exit+0x3db/0x558 [ 65.555897][ T88] ovs_exit_net+0x1df/0xba0 [ 65.560433][ T88] ? synchronize_rcu.part.0+0xda/0xf0 [ 65.565824][ T88] ? synchronize_rcu_expedited+0x620/0x620 [ 65.571653][ T88] ? ovs_dp_cmd_del+0x270/0x270 [ 65.576529][ T88] ? ovs_dp_cmd_del+0x270/0x270 [ 65.581405][ T88] ops_exit_list.isra.0+0xa8/0x150 [ 65.586550][ T88] cleanup_net+0x511/0xa50 [ 65.590984][ T88] ? unregister_pernet_device+0x70/0x70 [ 65.596579][ T88] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 65.602579][ T88] ? _raw_spin_unlock_irq+0x1f/0x80 [ 65.607799][ T88] process_one_work+0x965/0x16a0 [ 65.613441][ T88] ? lock_release+0x800/0x800 [ 65.618270][ T88] ? pwq_dec_nr_in_flight+0x310/0x310 [ 65.623673][ T88] ? rwlock_bug.part.0+0x90/0x90 [ 65.628639][ T88] worker_thread+0x96/0xe20 [ 65.633161][ T88] ? process_one_work+0x16a0/0x16a0 [ 65.638365][ T88] kthread+0x388/0x470 [ 65.642711][ T88] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 65.648450][ T88] ret_from_fork+0x24/0x30 [ 65.844791][ T88] tipc: TX() has been purged, node left! [ 65.887069][ T88] [ 65.889523][ T88] ============================= [ 65.894368][ T88] WARNING: suspicious RCU usage [ 65.899780][ T88] 5.6.0-rc7-next-20200326-syzkaller #0 Not tainted [ 65.906852][ T88] ----------------------------- [ 65.911798][ T88] net/ipv4/ipmr.c:1757 RCU-list traversed in non-reader section!! [ 65.920199][ T88] [ 65.920199][ T88] other info that might help us debug this: [ 65.920199][ T88] [ 65.931130][ T88] [ 65.931130][ T88] rcu_scheduler_active = 2, debug_locks = 1 [ 65.939792][ T88] 4 locks held by kworker/u4:3/88: [ 65.945465][ T88] #0: ffff8880a977e138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 [ 65.957269][ T88] #1: ffffc90000f17dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 [ 65.967751][ T88] #2: ffffffff8a56cd30 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50 [ 65.977662][ T88] #3: ffffffff8a578c28 (rtnl_mutex){+.+.}-{3:3}, at: ip6gre_exit_batch_net+0x88/0x700 [ 65.987788][ T88] [ 65.987788][ T88] stack backtrace: [ 65.993889][ T88] CPU: 1 PID: 88 Comm: kworker/u4:3 Not tainted 5.6.0-rc7-next-20200326-syzkaller #0 [ 66.003357][ T88] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.013428][ T88] Workqueue: netns cleanup_net [ 66.018211][ T88] Call Trace: [ 66.021526][ T88] dump_stack+0x188/0x20d [ 66.025867][ T88] ipmr_device_event+0x240/0x2b0 [ 66.030812][ T88] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 66.036719][ T88] notifier_call_chain+0xc0/0x230 [ 66.041757][ T88] call_netdevice_notifiers_info+0xb5/0x130 [ 66.047682][ T88] rollback_registered_many+0x75c/0xe70 [ 66.053259][ T88] ? netif_set_real_num_tx_queues+0x700/0x700 [ 66.059356][ T88] ? lock_downgrade+0x840/0x840 [ 66.064314][ T88] unregister_netdevice_many.part.0+0x16/0x1e0 [ 66.070494][ T88] unregister_netdevice_many+0x36/0x50 [ 66.076007][ T88] ip6gre_exit_batch_net+0x4e8/0x700 [ 66.081322][ T88] ? ip6gre_tunnel_link+0xf0/0xf0 [ 66.086363][ T88] ? rcu_read_lock_held_common+0x130/0x130 [ 66.092181][ T88] ? ip6gre_tunnel_link+0xf0/0xf0 [ 66.097212][ T88] ops_exit_list.isra.0+0x103/0x150 [ 66.102416][ T88] cleanup_net+0x511/0xa50 [ 66.106837][ T88] ? unregister_pernet_device+0x70/0x70 [ 66.112400][ T88] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 66.118402][ T88] ? _raw_spin_unlock_irq+0x1f/0x80 [ 66.123614][ T88] process_one_work+0x965/0x16a0 [ 66.128567][ T88] ? lock_release+0x800/0x800 [ 66.133592][ T88] ? pwq_dec_nr_in_flight+0x310/0x310 [ 66.139005][ T88] ? rwlock_bug.part.0+0x90/0x90 [ 66.143972][ T88] worker_thread+0x96/0xe20 [ 66.148496][ T88] ? process_one_work+0x16a0/0x16a0 [ 66.153827][ T88] kthread+0x388/0x470 [ 66.157914][ T88] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 66.163667][ T88] ret_from_fork+0x24/0x30 [ 67.142974][ T7056] can: request_module (can-proto-0) failed. executing program [ 69.382208][ T7056] can: request_module (can-proto-0) failed. [ 69.393856][ T7056] can: request_module (can-proto-0) failed.