[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
         Starting Load/Save RF Kill Switch Status...
[  OK  ] Started Update UTMP about System Runlevel Changes.
[  OK  ] Started Load/Save RF Kill Switch Status.


Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.1.47' (ECDSA) to the list of known hosts.
2020/04/24 12:27:06 fuzzer started
2020/04/24 12:27:08 connecting to host at 10.128.0.26:42923
2020/04/24 12:27:08 checking machine...
2020/04/24 12:27:08 checking revisions...
2020/04/24 12:27:08 testing simple program...
syzkaller login: [   64.146877][ T6846] IPVS: ftp: loaded support on port[0] = 21
2020/04/24 12:27:08 building call list...
[   64.495890][   T40] tipc: TX() has been purged, node left!
[   64.558275][   T40] 
[   64.560709][   T40] =============================
[   64.565545][   T40] WARNING: suspicious RCU usage
[   64.572808][   T40] 5.7.0-rc2-next-20200424-syzkaller #0 Not tainted
[   64.580114][   T40] -----------------------------
[   64.585030][   T40] net/ipv4/ipmr.c:1757 RCU-list traversed in non-reader section!!
[   64.594174][   T40] 
[   64.594174][   T40] other info that might help us debug this:
[   64.594174][   T40] 
[   64.605249][   T40] 
[   64.605249][   T40] rcu_scheduler_active = 2, debug_locks = 1
[   64.614109][   T40] 4 locks held by kworker/u4:3/40:
[   64.620033][   T40]  #0: ffff8880a9772138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0
[   64.632260][   T40]  #1: ffffc90000ec7dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0
[   64.665806][   T40]  #2: ffffffff8a5a2c30 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50
[   64.675141][   T40]  #3: ffffffff8a5aeba8 (rtnl_mutex){+.+.}-{3:3}, at: ip6gre_exit_batch_net+0x88/0x700
[   64.687174][   T40] 
[   64.687174][   T40] stack backtrace:
[   64.693097][   T40] CPU: 0 PID: 40 Comm: kworker/u4:3 Not tainted 5.7.0-rc2-next-20200424-syzkaller #0
[   64.702542][   T40] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   64.712608][   T40] Workqueue: netns cleanup_net
[   64.717371][   T40] Call Trace:
[   64.720660][   T40]  dump_stack+0x18f/0x20d
[   64.724991][   T40]  ipmr_device_event+0x240/0x2b0
[   64.729926][   T40]  ? __sanitizer_cov_trace_switch+0x45/0x70
[   64.735820][   T40]  notifier_call_chain+0xc0/0x230
[   64.740851][   T40]  call_netdevice_notifiers_info+0xb5/0x130
[   64.746757][   T40]  rollback_registered_many+0x75c/0xe70
[   64.752311][   T40]  ? netif_set_real_num_tx_queues+0x700/0x700
[   64.758389][   T40]  ? lock_downgrade+0x840/0x840
[   64.763248][   T40]  unregister_netdevice_many.part.0+0x16/0x1e0
[   64.769403][   T40]  unregister_netdevice_many+0x36/0x50
[   64.774859][   T40]  ip6gre_exit_batch_net+0x4e8/0x700
[   64.780148][   T40]  ? ip6gre_tunnel_link+0xf0/0xf0
[   64.785174][   T40]  ? rcu_read_lock_held_common+0x130/0x130
[   64.790984][   T40]  ? ip6gre_tunnel_link+0xf0/0xf0
[   64.796009][   T40]  ops_exit_list.isra.0+0x103/0x150
[   64.801214][   T40]  cleanup_net+0x511/0xa50
[   64.805631][   T40]  ? unregister_pernet_device+0x70/0x70
[   64.811179][   T40]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   64.817163][   T40]  ? _raw_spin_unlock_irq+0x1f/0x80
[   64.822377][   T40]  process_one_work+0x965/0x16a0
[   64.827331][   T40]  ? lock_release+0x800/0x800
[   64.832014][   T40]  ? pwq_dec_nr_in_flight+0x310/0x310
[   64.837391][   T40]  ? rwlock_bug.part.0+0x90/0x90
[   64.842338][   T40]  worker_thread+0x96/0xe20
[   64.846854][   T40]  ? process_one_work+0x16a0/0x16a0
[   64.852054][   T40]  kthread+0x38b/0x470
[   64.856122][   T40]  ? kthread_mod_delayed_work+0x1a0/0x1a0
[   64.861841][   T40]  ret_from_fork+0x24/0x30
[   66.107258][ T6828] can: request_module (can-proto-0) failed.
executing program
[   68.131795][ T6828] can: request_module (can-proto-0) failed.
[   68.143818][ T6828] can: request_module (can-proto-0) failed.