Warning: Permanently added '10.128.10.60' (ECDSA) to the list of known hosts.
2020/04/26 02:55:40 fuzzer started
2020/04/26 02:55:43 connecting to host at 10.128.0.26:44657
2020/04/26 02:55:43 checking machine...
2020/04/26 02:55:43 checking revisions...
2020/04/26 02:55:43 testing simple program...
syzkaller login: [   66.265704][ T6850] IPVS: ftp: loaded support on port[0] = 21
2020/04/26 02:55:43 building call list...
[   66.641070][  T400] tipc: TX() has been purged, node left!
[   66.673227][  T400] 
[   66.675701][  T400] =============================
[   66.681158][  T400] WARNING: suspicious RCU usage
[   66.686170][  T400] 5.7.0-rc2-next-20200424-syzkaller #0 Not tainted
[   66.693164][  T400] -----------------------------
[   66.698173][  T400] net/ipv4/ipmr.c:1757 RCU-list traversed in non-reader section!!
[   66.706696][  T400] 
[   66.706696][  T400] other info that might help us debug this:
[   66.706696][  T400] 
[   66.717595][  T400] 
[   66.717595][  T400] rcu_scheduler_active = 2, debug_locks = 1
[   66.726134][  T400] 4 locks held by kworker/u4:4/400:
[   66.731876][  T400]  #0: ffff8880a9772138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0
[   66.744096][  T400]  #1: ffffc900020b7dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0
[   66.754549][  T400]  #2: ffffffff8a5a2c30 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50
[   66.764310][  T400]  #3: ffffffff8a5aeba8 (rtnl_mutex){+.+.}-{3:3}, at: ip6gre_exit_batch_net+0x88/0x700
[   66.774962][  T400] 
[   66.774962][  T400] stack backtrace:
[   66.781319][  T400] CPU: 0 PID: 400 Comm: kworker/u4:4 Not tainted 5.7.0-rc2-next-20200424-syzkaller #0
[   66.790890][  T400] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   66.801090][  T400] Workqueue: netns cleanup_net
[   66.806026][  T400] Call Trace:
[   66.809344][  T400]  dump_stack+0x18f/0x20d
[   66.813705][  T400]  ipmr_device_event+0x240/0x2b0
[   66.818665][  T400]  ? __sanitizer_cov_trace_switch+0x45/0x70
[   66.824583][  T400]  notifier_call_chain+0xc0/0x230
[   66.829640][  T400]  call_netdevice_notifiers_info+0xb5/0x130
[   66.835557][  T400]  rollback_registered_many+0x75c/0xe70
[   66.841130][  T400]  ? netif_set_real_num_tx_queues+0x700/0x700
[   66.847227][  T400]  ? lock_downgrade+0x840/0x840
[   66.852126][  T400]  unregister_netdevice_many.part.0+0x16/0x1e0
[   66.858379][  T400]  unregister_netdevice_many+0x36/0x50
[   66.863930][  T400]  ip6gre_exit_batch_net+0x4e8/0x700
[   66.869218][  T400]  ? ip6gre_tunnel_link+0xf0/0xf0
[   66.874258][  T400]  ? rcu_read_lock_held_common+0x130/0x130
[   66.880097][  T400]  ? ip6gre_tunnel_link+0xf0/0xf0
[   66.885135][  T400]  ops_exit_list.isra.0+0x103/0x150
[   66.890340][  T400]  cleanup_net+0x511/0xa50
[   66.894938][  T400]  ? unregister_pernet_device+0x70/0x70
[   66.900506][  T400]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   66.906490][  T400]  ? _raw_spin_unlock_irq+0x1f/0x80
[   66.911707][  T400]  process_one_work+0x965/0x16a0
[   66.916677][  T400]  ? lock_release+0x800/0x800
[   66.921358][  T400]  ? pwq_dec_nr_in_flight+0x310/0x310
[   66.926732][  T400]  ? rwlock_bug.part.0+0x90/0x90
[   66.931679][  T400]  worker_thread+0x96/0xe20
[   66.936193][  T400]  ? process_one_work+0x16a0/0x16a0
[   66.941399][  T400]  kthread+0x38b/0x470
[   66.945467][  T400]  ? kthread_mod_delayed_work+0x1a0/0x1a0
[   66.951186][  T400]  ret_from_fork+0x24/0x30
[   68.219136][ T6876] can: request_module (can-proto-0) failed.
executing program
[   70.098209][ T6876] can: request_module (can-proto-0) failed.
[   70.109916][ T6876] can: request_module (can-proto-0) failed.