[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
         Starting Load/Save RF Kill Switch Status...
[  OK  ] Started Update UTMP about System Runlevel Changes.
[  OK  ] Started Load/Save RF Kill Switch Status.


Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.15.200' (ECDSA) to the list of known hosts.
2020/04/22 07:22:51 fuzzer started
2020/04/22 07:22:53 connecting to host at 10.128.0.26:42967
2020/04/22 07:22:53 checking machine...
2020/04/22 07:22:53 checking revisions...
2020/04/22 07:22:53 testing simple program...
syzkaller login: [   70.792552][ T6858] IPVS: ftp: loaded support on port[0] = 21
2020/04/22 07:22:53 building call list...
[   71.164521][ T6797] tipc: TX() has been purged, node left!
[   71.216595][ T6797] 
[   71.219036][ T6797] =============================
[   71.223875][ T6797] WARNING: suspicious RCU usage
[   71.231068][ T6797] 5.7.0-rc2-next-20200422-syzkaller #0 Not tainted
[   71.238629][ T6797] -----------------------------
[   71.243527][ T6797] net/ipv4/ipmr.c:1757 RCU-list traversed in non-reader section!!
[   71.253149][ T6797] 
[   71.253149][ T6797] other info that might help us debug this:
[   71.253149][ T6797] 
[   71.264581][ T6797] 
[   71.264581][ T6797] rcu_scheduler_active = 2, debug_locks = 1
[   71.272701][ T6797] 4 locks held by kworker/u4:6/6797:
[   71.279489][ T6797]  #0: ffff8880a9772138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0
[   71.301290][ T6797]  #1: ffffc900017e7dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0
[   71.312639][ T6797]  #2: ffffffff8a5a2cb0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50
[   71.323353][ T6797]  #3: ffffffff8a5aec28 (rtnl_mutex){+.+.}-{3:3}, at: ip6gre_exit_batch_net+0x88/0x700
[   71.334498][ T6797] 
[   71.334498][ T6797] stack backtrace:
[   71.340480][ T6797] CPU: 1 PID: 6797 Comm: kworker/u4:6 Not tainted 5.7.0-rc2-next-20200422-syzkaller #0
[   71.350103][ T6797] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   71.360160][ T6797] Workqueue: netns cleanup_net
[   71.364913][ T6797] Call Trace:
[   71.368203][ T6797]  dump_stack+0x18f/0x20d
[   71.372535][ T6797]  ipmr_device_event+0x240/0x2b0
[   71.377469][ T6797]  ? __sanitizer_cov_trace_switch+0x45/0x70
[   71.383362][ T6797]  notifier_call_chain+0xc0/0x230
[   71.388392][ T6797]  call_netdevice_notifiers_info+0xb5/0x130
[   71.394286][ T6797]  rollback_registered_many+0x75c/0xe70
[   71.399835][ T6797]  ? netif_set_real_num_tx_queues+0x700/0x700
[   71.405913][ T6797]  ? lock_downgrade+0x840/0x840
[   71.410770][ T6797]  unregister_netdevice_many.part.0+0x16/0x1e0
[   71.416924][ T6797]  unregister_netdevice_many+0x36/0x50
[   71.422466][ T6797]  ip6gre_exit_batch_net+0x4e8/0x700
[   71.427751][ T6797]  ? ip6gre_tunnel_link+0xf0/0xf0
[   71.432772][ T6797]  ? rcu_read_lock_held_common+0x130/0x130
[   71.438580][ T6797]  ? ip6gre_tunnel_link+0xf0/0xf0
[   71.443606][ T6797]  ops_exit_list.isra.0+0x103/0x150
[   71.448808][ T6797]  cleanup_net+0x511/0xa50
[   71.453228][ T6797]  ? unregister_pernet_device+0x70/0x70
[   71.458773][ T6797]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   71.464749][ T6797]  ? _raw_spin_unlock_irq+0x1f/0x80
[   71.470126][ T6797]  process_one_work+0x965/0x16a0
[   71.475074][ T6797]  ? lock_release+0x800/0x800
[   71.479748][ T6797]  ? pwq_dec_nr_in_flight+0x310/0x310
[   71.485121][ T6797]  ? rwlock_bug.part.0+0x90/0x90
[   71.490064][ T6797]  worker_thread+0x96/0xe20
[   71.494578][ T6797]  ? process_one_work+0x16a0/0x16a0
[   71.499785][ T6797]  kthread+0x38b/0x470
[   71.503892][ T6797]  ? kthread_mod_delayed_work+0x1a0/0x1a0
[   71.509621][ T6797]  ret_from_fork+0x24/0x30
[   72.702803][ T6837] can: request_module (can-proto-0) failed.
executing program
[   74.682002][ T6837] can: request_module (can-proto-0) failed.
[   74.694790][ T6837] can: request_module (can-proto-0) failed.