Warning: Permanently added '10.128.10.6' (ECDSA) to the list of known hosts.
2020/04/26 18:04:40 fuzzer started
2020/04/26 18:04:42 connecting to host at 10.128.0.26:41659
2020/04/26 18:04:42 checking machine...
2020/04/26 18:04:42 checking revisions...
2020/04/26 18:04:42 testing simple program...
syzkaller login: [   63.921822][ T6846] IPVS: ftp: loaded support on port[0] = 21
2020/04/26 18:04:42 building call list...
[   64.272254][   T43] tipc: TX() has been purged, node left!
[   64.314395][   T43] 
[   64.316882][   T43] =============================
[   64.323116][   T43] WARNING: suspicious RCU usage
[   64.328036][   T43] 5.7.0-rc2-next-20200424-syzkaller #0 Not tainted
[   64.335923][   T43] -----------------------------
[   64.340820][   T43] net/ipv4/ipmr.c:1757 RCU-list traversed in non-reader section!!
[   64.349907][   T43] 
[   64.349907][   T43] other info that might help us debug this:
[   64.349907][   T43] 
[   64.362859][   T43] 
[   64.362859][   T43] rcu_scheduler_active = 2, debug_locks = 1
[   64.370999][   T43] 4 locks held by kworker/u4:2/43:
[   64.377276][   T43]  #0: ffff8880a9772138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0
[   64.388392][   T43]  #1: ffffc90000ef7dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0
[   64.399213][   T43]  #2: ffffffff8a5a2c30 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50
[   64.409380][   T43]  #3: ffffffff8a5aeba8 (rtnl_mutex){+.+.}-{3:3}, at: ip6gre_exit_batch_net+0x88/0x700
[   64.428947][   T43] 
[   64.428947][   T43] stack backtrace:
[   64.435761][   T43] CPU: 1 PID: 43 Comm: kworker/u4:2 Not tainted 5.7.0-rc2-next-20200424-syzkaller #0
[   64.445219][   T43] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   64.455383][   T43] Workqueue: netns cleanup_net
[   64.460142][   T43] Call Trace:
[   64.463430][   T43]  dump_stack+0x18f/0x20d
[   64.467765][   T43]  ipmr_device_event+0x240/0x2b0
[   64.472705][   T43]  ? __sanitizer_cov_trace_switch+0x45/0x70
[   64.478709][   T43]  notifier_call_chain+0xc0/0x230
[   64.483742][   T43]  call_netdevice_notifiers_info+0xb5/0x130
[   64.489637][   T43]  rollback_registered_many+0x75c/0xe70
[   64.495189][   T43]  ? netif_set_real_num_tx_queues+0x700/0x700
[   64.501265][   T43]  ? lock_downgrade+0x840/0x840
[   64.506125][   T43]  unregister_netdevice_many.part.0+0x16/0x1e0
[   64.512279][   T43]  unregister_netdevice_many+0x36/0x50
[   64.517734][   T43]  ip6gre_exit_batch_net+0x4e8/0x700
[   64.523040][   T43]  ? ip6gre_tunnel_link+0xf0/0xf0
[   64.528064][   T43]  ? rcu_read_lock_held_common+0x130/0x130
[   64.533871][   T43]  ? ip6gre_tunnel_link+0xf0/0xf0
[   64.538897][   T43]  ops_exit_list.isra.0+0x103/0x150
[   64.544099][   T43]  cleanup_net+0x511/0xa50
[   64.548517][   T43]  ? unregister_pernet_device+0x70/0x70
[   64.554062][   T43]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   64.560038][   T43]  ? _raw_spin_unlock_irq+0x1f/0x80
[   64.565237][   T43]  process_one_work+0x965/0x16a0
[   64.570181][   T43]  ? lock_release+0x800/0x800
[   64.574858][   T43]  ? pwq_dec_nr_in_flight+0x310/0x310
[   64.580230][   T43]  ? rwlock_bug.part.0+0x90/0x90
[   64.585175][   T43]  worker_thread+0x96/0xe20
[   64.589689][   T43]  ? process_one_work+0x16a0/0x16a0
[   64.594884][   T43]  kthread+0x38b/0x470
[   64.598952][   T43]  ? kthread_mod_delayed_work+0x1a0/0x1a0
[   64.604683][   T43]  ret_from_fork+0x24/0x30
[   65.782857][ T6826] can: request_module (can-proto-0) failed.
executing program
[   67.867980][ T6826] can: request_module (can-proto-0) failed.
[   67.879597][ T6826] can: request_module (can-proto-0) failed.