[  OK  ] Reached target Login Prompts.
[  OK  ] Reached target Multi-User System.
[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
[  OK  ] Started Update UTMP about System Runlevel Changes.


Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.10.26' (ECDSA) to the list of known hosts.
2020/04/24 12:02:07 fuzzer started
2020/04/24 12:02:09 connecting to host at 10.128.0.26:41779
2020/04/24 12:02:09 checking machine...
2020/04/24 12:02:09 checking revisions...
2020/04/24 12:02:09 testing simple program...
syzkaller login: [   59.331312][ T6853] IPVS: ftp: loaded support on port[0] = 21
2020/04/24 12:02:09 building call list...
[   59.682220][  T158] tipc: TX() has been purged, node left!
[   59.724648][  T158] 
[   59.727089][  T158] =============================
[   59.731945][  T158] WARNING: suspicious RCU usage
[   59.738340][  T158] 5.7.0-rc2-next-20200423-syzkaller #0 Not tainted
[   59.745664][  T158] -----------------------------
[   59.750586][  T158] net/ipv4/ipmr.c:1757 RCU-list traversed in non-reader section!!
[   59.760127][  T158] 
[   59.760127][  T158] other info that might help us debug this:
[   59.760127][  T158] 
[   59.796415][  T158] 
[   59.796415][  T158] rcu_scheduler_active = 2, debug_locks = 1
[   59.822063][  T158] 4 locks held by kworker/u4:3/158:
[   59.827286][  T158]  #0: ffff8880a9772138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0
[   59.837771][  T158]  #1: ffffc900015a7dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0
[   59.848408][  T158]  #2: ffffffff8a5a3030 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50
[   59.858018][  T158]  #3: ffffffff8a5aefa8 (rtnl_mutex){+.+.}-{3:3}, at: ip6gre_exit_batch_net+0x88/0x700
[   59.867941][  T158] 
[   59.867941][  T158] stack backtrace:
[   59.874165][  T158] CPU: 1 PID: 158 Comm: kworker/u4:3 Not tainted 5.7.0-rc2-next-20200423-syzkaller #0
[   59.883706][  T158] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   59.894202][  T158] Workqueue: netns cleanup_net
[   59.898957][  T158] Call Trace:
[   59.902245][  T158]  dump_stack+0x18f/0x20d
[   59.906577][  T158]  ipmr_device_event+0x240/0x2b0
[   59.911517][  T158]  ? __sanitizer_cov_trace_switch+0x45/0x70
[   59.917411][  T158]  notifier_call_chain+0xc0/0x230
[   59.922442][  T158]  call_netdevice_notifiers_info+0xb5/0x130
[   59.928601][  T158]  rollback_registered_many+0x75c/0xe70
[   59.934160][  T158]  ? netif_set_real_num_tx_queues+0x700/0x700
[   59.940433][  T158]  ? lock_downgrade+0x840/0x840
[   59.945302][  T158]  unregister_netdevice_many.part.0+0x16/0x1e0
[   59.951632][  T158]  unregister_netdevice_many+0x36/0x50
[   59.957736][  T158]  ip6gre_exit_batch_net+0x4e8/0x700
[   59.963028][  T158]  ? ip6gre_tunnel_link+0xf0/0xf0
[   59.968048][  T158]  ? rcu_read_lock_held_common+0x130/0x130
[   59.973856][  T158]  ? ip6gre_tunnel_link+0xf0/0xf0
[   59.978878][  T158]  ops_exit_list.isra.0+0x103/0x150
[   59.984101][  T158]  cleanup_net+0x511/0xa50
[   59.988519][  T158]  ? unregister_pernet_device+0x70/0x70
[   59.994069][  T158]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   60.000040][  T158]  ? _raw_spin_unlock_irq+0x1f/0x80
[   60.005239][  T158]  process_one_work+0x965/0x16a0
[   60.010185][  T158]  ? lock_release+0x800/0x800
[   60.014859][  T158]  ? pwq_dec_nr_in_flight+0x310/0x310
[   60.020227][  T158]  ? rwlock_bug.part.0+0x90/0x90
[   60.025329][  T158]  ? schedule+0xe7/0x2a0
[   60.029581][  T158]  worker_thread+0x96/0xe20
[   60.034189][  T158]  ? process_one_work+0x16a0/0x16a0
[   60.040170][  T158]  kthread+0x38b/0x470
[   60.044235][  T158]  ? kthread_mod_delayed_work+0x1a0/0x1a0
[   60.049960][  T158]  ret_from_fork+0x24/0x30
[   61.110652][ T6831] can: request_module (can-proto-0) failed.
executing program
[   63.197927][ T6831] can: request_module (can-proto-0) failed.
[   63.210402][ T6831] can: request_module (can-proto-0) failed.