Warning: Permanently added '10.128.10.15' (ECDSA) to the list of known hosts.
2020/04/25 10:22:24 fuzzer started
2020/04/25 10:22:26 connecting to host at 10.128.0.26:32987
2020/04/25 10:22:26 checking machine...
2020/04/25 10:22:26 checking revisions...
2020/04/25 10:22:26 testing simple program...
syzkaller login: [   66.118369][ T6831] IPVS: ftp: loaded support on port[0] = 21
2020/04/25 10:22:27 building call list...
[   66.442281][   T21] tipc: TX() has been purged, node left!
[   66.494557][   T21] 
[   66.497016][   T21] =============================
[   66.501875][   T21] WARNING: suspicious RCU usage
[   66.508670][   T21] 5.7.0-rc2-next-20200424-syzkaller #0 Not tainted
[   66.516375][   T21] -----------------------------
[   66.521276][   T21] net/ipv4/ipmr.c:1757 RCU-list traversed in non-reader section!!
[   66.530555][   T21] 
[   66.530555][   T21] other info that might help us debug this:
[   66.530555][   T21] 
[   66.541943][   T21] 
[   66.541943][   T21] rcu_scheduler_active = 2, debug_locks = 1
[   66.551116][   T21] 4 locks held by kworker/u4:1/21:
[   66.557352][   T21]  #0: ffff8880a9772138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0
[   66.569221][   T21]  #1: ffffc90000dd7dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0
[   66.581003][   T21]  #2: ffffffff8a5a2c30 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50
[   66.605745][   T21]  #3: ffffffff8a5aeba8 (rtnl_mutex){+.+.}-{3:3}, at: ip6gre_exit_batch_net+0x88/0x700
[   66.617020][   T21] 
[   66.617020][   T21] stack backtrace:
[   66.624055][   T21] CPU: 1 PID: 21 Comm: kworker/u4:1 Not tainted 5.7.0-rc2-next-20200424-syzkaller #0
[   66.633514][   T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   66.643574][   T21] Workqueue: netns cleanup_net
[   66.648675][   T21] Call Trace:
[   66.652229][   T21]  dump_stack+0x18f/0x20d
[   66.656564][   T21]  ipmr_device_event+0x240/0x2b0
[   66.661534][   T21]  ? __sanitizer_cov_trace_switch+0x45/0x70
[   66.667432][   T21]  notifier_call_chain+0xc0/0x230
[   66.672728][   T21]  call_netdevice_notifiers_info+0xb5/0x130
[   66.678629][   T21]  rollback_registered_many+0x75c/0xe70
[   66.684182][   T21]  ? netif_set_real_num_tx_queues+0x700/0x700
[   66.690258][   T21]  ? lock_downgrade+0x840/0x840
[   66.695119][   T21]  unregister_netdevice_many.part.0+0x16/0x1e0
[   66.701274][   T21]  unregister_netdevice_many+0x36/0x50
[   66.706740][   T21]  ip6gre_exit_batch_net+0x4e8/0x700
[   66.712066][   T21]  ? ip6gre_tunnel_link+0xf0/0xf0
[   66.717091][   T21]  ? rcu_read_lock_held_common+0x130/0x130
[   66.722911][   T21]  ? ip6gre_tunnel_link+0xf0/0xf0
[   66.727940][   T21]  ops_exit_list.isra.0+0x103/0x150
[   66.733143][   T21]  cleanup_net+0x511/0xa50
[   66.737564][   T21]  ? unregister_pernet_device+0x70/0x70
[   66.743115][   T21]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   66.749093][   T21]  ? _raw_spin_unlock_irq+0x1f/0x80
[   66.754331][   T21]  process_one_work+0x965/0x16a0
[   66.759278][   T21]  ? lock_release+0x800/0x800
[   66.763958][   T21]  ? pwq_dec_nr_in_flight+0x310/0x310
[   66.769336][   T21]  ? rwlock_bug.part.0+0x90/0x90
[   66.774292][   T21]  worker_thread+0x96/0xe20
[   66.778814][   T21]  ? process_one_work+0x16a0/0x16a0
[   66.784011][   T21]  kthread+0x38b/0x470
[   66.788079][   T21]  ? kthread_mod_delayed_work+0x1a0/0x1a0
[   66.793799][   T21]  ret_from_fork+0x24/0x30
[   67.949619][ T6857] can: request_module (can-proto-0) failed.
executing program
[   69.909676][ T6857] can: request_module (can-proto-0) failed.
[   69.921125][ T6857] can: request_module (can-proto-0) failed.