[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty2. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.56' (ECDSA) to the list of known hosts. 2020/04/19 11:27:56 fuzzer started 2020/04/19 11:27:58 connecting to host at 10.128.0.26:32923 2020/04/19 11:27:58 checking machine... 2020/04/19 11:27:58 checking revisions... 2020/04/19 11:27:58 testing simple program... syzkaller login: [ 58.147343][ T6855] IPVS: ftp: loaded support on port[0] = 21 2020/04/19 11:27:59 building call list... [ 58.367525][ T6806] [ 58.370007][ T6806] ============================= [ 58.374864][ T6806] WARNING: suspicious RCU usage [ 58.381445][ T6806] 5.7.0-rc1-next-20200417-syzkaller #0 Not tainted [ 58.390898][ T6806] ----------------------------- [ 58.395881][ T6806] net/openvswitch/conntrack.c:1898 RCU-list traversed in non-reader section!! [ 58.406067][ T6806] [ 58.406067][ T6806] other info that might help us debug this: [ 58.406067][ T6806] [ 58.417587][ T6806] [ 58.417587][ T6806] rcu_scheduler_active = 2, debug_locks = 1 [ 58.425660][ T6806] 3 locks held by kworker/u4:6/6806: [ 58.433159][ T6806] #0: ffff8880a977a138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 [ 58.445451][ T6806] #1: ffffc9000565fdc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 [ 58.459584][ T6806] #2: ffffffff8a5a08f0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50 [ 58.469767][ T6806] [ 58.469767][ T6806] stack backtrace: [ 58.475737][ T6806] CPU: 1 PID: 6806 Comm: kworker/u4:6 Not tainted 5.7.0-rc1-next-20200417-syzkaller #0 [ 58.485359][ T6806] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.495428][ T6806] Workqueue: netns cleanup_net [ 58.500187][ T6806] Call Trace: [ 58.503479][ T6806] dump_stack+0x188/0x20d [ 58.507813][ T6806] ovs_ct_exit+0x3db/0x558 [ 58.512330][ T6806] ovs_exit_net+0x1df/0xba0 [ 58.516871][ T6806] ? synchronize_rcu.part.0+0xda/0xf0 [ 58.522607][ T6806] ? synchronize_rcu_expedited+0x620/0x620 [ 58.528428][ T6806] ? ovs_dp_cmd_del+0x270/0x270 [ 58.533293][ T6806] ? ovs_dp_cmd_del+0x270/0x270 [ 58.538271][ T6806] ops_exit_list.isra.0+0xa8/0x150 [ 58.543397][ T6806] cleanup_net+0x511/0xa50 [ 58.547818][ T6806] ? unregister_pernet_device+0x70/0x70 [ 58.553384][ T6806] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 58.559361][ T6806] ? _raw_spin_unlock_irq+0x1f/0x80 [ 58.564571][ T6806] process_one_work+0x965/0x16a0 [ 58.569521][ T6806] ? lock_release+0x800/0x800 [ 58.574307][ T6806] ? pwq_dec_nr_in_flight+0x310/0x310 [ 58.580372][ T6806] ? rwlock_bug.part.0+0x90/0x90 [ 58.585320][ T6806] worker_thread+0x96/0xe20 [ 58.589864][ T6806] ? process_one_work+0x16a0/0x16a0 [ 58.595167][ T6806] kthread+0x388/0x470 [ 58.599241][ T6806] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 58.604964][ T6806] ret_from_fork+0x24/0x30 [ 58.797022][ T6806] tipc: TX() has been purged, node left! [ 58.849200][ T6806] [ 58.851804][ T6806] ============================= [ 58.856674][ T6806] WARNING: suspicious RCU usage [ 58.864171][ T6806] 5.7.0-rc1-next-20200417-syzkaller #0 Not tainted [ 58.871652][ T6806] ----------------------------- [ 58.876550][ T6806] net/ipv4/ipmr.c:1757 RCU-list traversed in non-reader section!! [ 58.886757][ T6806] [ 58.886757][ T6806] other info that might help us debug this: [ 58.886757][ T6806] [ 58.898516][ T6806] [ 58.898516][ T6806] rcu_scheduler_active = 2, debug_locks = 1 [ 58.906676][ T6806] 4 locks held by kworker/u4:6/6806: [ 58.913391][ T6806] #0: ffff8880a977a138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 [ 58.924727][ T6806] #1: ffffc9000565fdc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 [ 58.935726][ T6806] #2: ffffffff8a5a08f0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50 [ 58.945972][ T6806] #3: ffffffff8a5ac868 (rtnl_mutex){+.+.}-{3:3}, at: ip6gre_exit_batch_net+0x88/0x700 [ 58.956667][ T6806] [ 58.956667][ T6806] stack backtrace: [ 58.963560][ T6806] CPU: 1 PID: 6806 Comm: kworker/u4:6 Not tainted 5.7.0-rc1-next-20200417-syzkaller #0 [ 58.973198][ T6806] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.983264][ T6806] Workqueue: netns cleanup_net [ 58.988023][ T6806] Call Trace: [ 58.991321][ T6806] dump_stack+0x188/0x20d [ 58.995664][ T6806] ipmr_device_event+0x240/0x2b0 [ 59.000609][ T6806] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 59.006517][ T6806] notifier_call_chain+0xc0/0x230 [ 59.011562][ T6806] call_netdevice_notifiers_info+0xb5/0x130 [ 59.017470][ T6806] rollback_registered_many+0x75c/0xe70 [ 59.023025][ T6806] ? netif_set_real_num_tx_queues+0x700/0x700 [ 59.029107][ T6806] ? lock_downgrade+0x840/0x840 [ 59.033969][ T6806] unregister_netdevice_many.part.0+0x16/0x1e0 [ 59.040130][ T6806] unregister_netdevice_many+0x36/0x50 [ 59.045597][ T6806] ip6gre_exit_batch_net+0x4e8/0x700 [ 59.050894][ T6806] ? ip6gre_tunnel_link+0xf0/0xf0 [ 59.055926][ T6806] ? rcu_read_lock_held_common+0x130/0x130 [ 59.061744][ T6806] ? ip6gre_tunnel_link+0xf0/0xf0 [ 59.066783][ T6806] ops_exit_list.isra.0+0x103/0x150 [ 59.071997][ T6806] cleanup_net+0x511/0xa50 [ 59.076418][ T6806] ? unregister_pernet_device+0x70/0x70 [ 59.081975][ T6806] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 59.087966][ T6806] ? _raw_spin_unlock_irq+0x1f/0x80 [ 59.093181][ T6806] process_one_work+0x965/0x16a0 [ 59.098132][ T6806] ? lock_release+0x800/0x800 [ 59.102816][ T6806] ? pwq_dec_nr_in_flight+0x310/0x310 [ 59.108216][ T6806] ? rwlock_bug.part.0+0x90/0x90 [ 59.113254][ T6806] worker_thread+0x96/0xe20 [ 59.117978][ T6806] ? process_one_work+0x16a0/0x16a0 [ 59.123179][ T6806] kthread+0x388/0x470 [ 59.127248][ T6806] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 59.132981][ T6806] ret_from_fork+0x24/0x30 [ 60.124435][ T6835] can: request_module (can-proto-0) failed. executing program [ 62.380860][ T6835] can: request_module (can-proto-0) failed. [ 62.392854][ T6835] can: request_module (can-proto-0) failed.