Warning: Permanently added '10.128.0.119' (ECDSA) to the list of known hosts.
2020/04/21 06:49:53 fuzzer started
2020/04/21 06:49:54 connecting to host at 10.128.0.26:39397
2020/04/21 06:49:54 checking machine...
2020/04/21 06:49:54 checking revisions...
2020/04/21 06:49:54 testing simple program...
syzkaller login: [   58.729192][ T6845] ld (6845) used greatest stack depth: 22944 bytes left
[   59.008652][ T6852] IPVS: ftp: loaded support on port[0] = 21
2020/04/21 06:49:55 building call list...
[   59.277723][   T56] tipc: TX() has been purged, node left!
[   59.340104][   T56] 
[   59.342757][   T56] =============================
[   59.349263][   T56] WARNING: suspicious RCU usage
[   59.354329][   T56] 5.7.0-rc2-next-20200421-syzkaller #0 Not tainted
[   59.365962][   T56] -----------------------------
[   59.371812][   T56] net/ipv4/ipmr.c:1757 RCU-list traversed in non-reader section!!
[   59.380627][   T56] 
[   59.380627][   T56] other info that might help us debug this:
[   59.380627][   T56] 
[   59.394002][   T56] 
[   59.394002][   T56] rcu_scheduler_active = 2, debug_locks = 1
[   59.403033][   T56] 4 locks held by kworker/u4:3/56:
[   59.409237][   T56]  #0: ffff8880a9772138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0
[   59.420750][   T56]  #1: ffffc90000f17dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0
[   59.431824][   T56]  #2: ffffffff8a5a2b70 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50
[   59.442147][   T56]  #3: ffffffff8a5aeae8 (rtnl_mutex){+.+.}-{3:3}, at: ip6gre_exit_batch_net+0x88/0x700
[   59.453052][   T56] 
[   59.453052][   T56] stack backtrace:
[   59.460185][   T56] CPU: 0 PID: 56 Comm: kworker/u4:3 Not tainted 5.7.0-rc2-next-20200421-syzkaller #0
[   59.470345][   T56] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   59.480755][   T56] Workqueue: netns cleanup_net
[   59.485510][   T56] Call Trace:
[   59.496293][   T56]  dump_stack+0x188/0x20d
[   59.501023][   T56]  ipmr_device_event+0x240/0x2b0
[   59.506598][   T56]  ? __sanitizer_cov_trace_switch+0x45/0x70
[   59.512620][   T56]  notifier_call_chain+0xc0/0x230
[   59.517673][   T56]  call_netdevice_notifiers_info+0xb5/0x130
[   59.523679][   T56]  rollback_registered_many+0x75c/0xe70
[   59.529246][   T56]  ? netif_set_real_num_tx_queues+0x700/0x700
[   59.535329][   T56]  ? lock_downgrade+0x840/0x840
[   59.540571][   T56]  unregister_netdevice_many.part.0+0x16/0x1e0
[   59.546771][   T56]  unregister_netdevice_many+0x36/0x50
[   59.552239][   T56]  ip6gre_exit_batch_net+0x4e8/0x700
[   59.557736][   T56]  ? ip6gre_tunnel_link+0xf0/0xf0
[   59.562779][   T56]  ? rcu_read_lock_held_common+0x130/0x130
[   59.569551][   T56]  ? ip6gre_tunnel_link+0xf0/0xf0
[   59.574587][   T56]  ops_exit_list.isra.0+0x103/0x150
[   59.580143][   T56]  cleanup_net+0x511/0xa50
[   59.584950][   T56]  ? unregister_pernet_device+0x70/0x70
[   59.590510][   T56]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   59.596625][   T56]  ? _raw_spin_unlock_irq+0x1f/0x80
[   59.601943][   T56]  process_one_work+0x965/0x16a0
[   59.606894][   T56]  ? lock_release+0x800/0x800
[   59.611659][   T56]  ? pwq_dec_nr_in_flight+0x310/0x310
[   59.617384][   T56]  ? rwlock_bug.part.0+0x90/0x90
[   59.622343][   T56]  worker_thread+0x96/0xe20
[   59.626857][   T56]  ? process_one_work+0x16a0/0x16a0
[   59.632066][   T56]  kthread+0x38b/0x470
[   59.636144][   T56]  ? kthread_mod_delayed_work+0x1a0/0x1a0
[   59.642128][   T56]  ret_from_fork+0x24/0x30
[   60.824089][ T6837] can: request_module (can-proto-0) failed.
executing program
[   62.824875][ T6837] can: request_module (can-proto-0) failed.
[   62.838494][ T6837] can: request_module (can-proto-0) failed.