Warning: Permanently added '10.128.1.49' (ECDSA) to the list of known hosts.
2020/04/24 12:27:07 fuzzer started
2020/04/24 12:27:09 connecting to host at 10.128.0.26:44929
2020/04/24 12:27:09 checking machine...
2020/04/24 12:27:09 checking revisions...
2020/04/24 12:27:09 testing simple program...
syzkaller login: [   64.708515][ T6849] IPVS: ftp: loaded support on port[0] = 21
2020/04/24 12:27:09 building call list...
[   65.052569][    T7] tipc: TX() has been purged, node left!
[   65.094190][    T7] 
[   65.096674][    T7] =============================
[   65.102980][    T7] WARNING: suspicious RCU usage
[   65.107897][    T7] 5.7.0-rc2-next-20200424-syzkaller #0 Not tainted
[   65.115821][    T7] -----------------------------
[   65.123351][    T7] net/ipv4/ipmr.c:1757 RCU-list traversed in non-reader section!!
[   65.131208][    T7] 
[   65.131208][    T7] other info that might help us debug this:
[   65.131208][    T7] 
[   65.142797][    T7] 
[   65.142797][    T7] rcu_scheduler_active = 2, debug_locks = 1
[   65.150863][    T7] 4 locks held by kworker/u4:0/7:
[   65.156693][    T7]  #0: ffff8880a9772138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0
[   65.169246][    T7]  #1: ffffc90000cdfdc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0
[   65.180237][    T7]  #2: ffffffff8a5a2c30 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50
[   65.191213][    T7]  #3: ffffffff8a5aeba8 (rtnl_mutex){+.+.}-{3:3}, at: ip6gre_exit_batch_net+0x88/0x700
[   65.201772][    T7] 
[   65.201772][    T7] stack backtrace:
[   65.207674][    T7] CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 5.7.0-rc2-next-20200424-syzkaller #0
[   65.217051][    T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   65.227106][    T7] Workqueue: netns cleanup_net
[   65.231857][    T7] Call Trace:
[   65.235142][    T7]  dump_stack+0x18f/0x20d
[   65.239476][    T7]  ipmr_device_event+0x240/0x2b0
[   65.244410][    T7]  ? __sanitizer_cov_trace_switch+0x45/0x70
[   65.250306][    T7]  notifier_call_chain+0xc0/0x230
[   65.255341][    T7]  call_netdevice_notifiers_info+0xb5/0x130
[   65.261232][    T7]  rollback_registered_many+0x75c/0xe70
[   65.266783][    T7]  ? netif_set_real_num_tx_queues+0x700/0x700
[   65.272857][    T7]  ? lock_downgrade+0x840/0x840
[   65.277717][    T7]  unregister_netdevice_many.part.0+0x16/0x1e0
[   65.283878][    T7]  unregister_netdevice_many+0x36/0x50
[   65.289331][    T7]  ip6gre_exit_batch_net+0x4e8/0x700
[   65.294619][    T7]  ? ip6gre_tunnel_link+0xf0/0xf0
[   65.299638][    T7]  ? rcu_read_lock_held_common+0x130/0x130
[   65.305444][    T7]  ? ip6gre_tunnel_link+0xf0/0xf0
[   65.310471][    T7]  ops_exit_list.isra.0+0x103/0x150
[   65.315671][    T7]  cleanup_net+0x511/0xa50
[   65.320106][    T7]  ? unregister_pernet_device+0x70/0x70
[   65.325651][    T7]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   65.331626][    T7]  ? _raw_spin_unlock_irq+0x1f/0x80
[   65.336828][    T7]  process_one_work+0x965/0x16a0
[   65.341771][    T7]  ? lock_release+0x800/0x800
[   65.346445][    T7]  ? pwq_dec_nr_in_flight+0x310/0x310
[   65.351819][    T7]  ? rwlock_bug.part.0+0x90/0x90
[   65.356769][    T7]  worker_thread+0x96/0xe20
[   65.361288][    T7]  ? process_one_work+0x16a0/0x16a0
[   65.366491][    T7]  kthread+0x38b/0x470
[   65.370558][    T7]  ? kthread_mod_delayed_work+0x1a0/0x1a0
[   65.376281][    T7]  ret_from_fork+0x24/0x30
[   66.748081][ T6830] can: request_module (can-proto-0) failed.
executing program
[   68.497531][ T6830] can: request_module (can-proto-0) failed.
[   68.508929][ T6830] can: request_module (can-proto-0) failed.