Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.10.59' (ECDSA) to the list of known hosts.
2020/04/26 02:55:50 fuzzer started
2020/04/26 02:55:52 connecting to host at 10.128.0.26:33973
2020/04/26 02:55:52 checking machine...
2020/04/26 02:55:52 checking revisions...
2020/04/26 02:55:52 testing simple program...
syzkaller login: [   65.490853][ T6859] IPVS: ftp: loaded support on port[0] = 21
2020/04/26 02:55:52 building call list...
[   65.883764][   T21] tipc: TX() has been purged, node left!
[   65.936227][   T21] 
[   65.938688][   T21] =============================
[   65.944148][   T21] WARNING: suspicious RCU usage
[   65.949114][   T21] 5.7.0-rc2-next-20200424-syzkaller #0 Not tainted
[   65.956435][   T21] -----------------------------
[   65.961339][   T21] net/ipv4/ipmr.c:1757 RCU-list traversed in non-reader section!!
[   65.969801][   T21] 
[   65.969801][   T21] other info that might help us debug this:
[   65.969801][   T21] 
[   65.980659][   T21] 
[   65.980659][   T21] rcu_scheduler_active = 2, debug_locks = 1
[   65.990305][   T21] 4 locks held by kworker/u4:1/21:
[   65.995922][   T21]  #0: ffff8880a9772138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0
[   66.006832][   T21]  #1: ffffc90000dd7dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0
[   66.017243][   T21]  #2: ffffffff8a5a2c30 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50
[   66.027066][   T21]  #3: ffffffff8a5aeba8 (rtnl_mutex){+.+.}-{3:3}, at: ip6gre_exit_batch_net+0x88/0x700
[   66.037196][   T21] 
[   66.037196][   T21] stack backtrace:
[   66.043169][   T21] CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 5.7.0-rc2-next-20200424-syzkaller #0
[   66.052644][   T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   66.062993][   T21] Workqueue: netns cleanup_net
[   66.067751][   T21] Call Trace:
[   66.071046][   T21]  dump_stack+0x18f/0x20d
[   66.075571][   T21]  ipmr_device_event+0x240/0x2b0
[   66.081128][   T21]  ? __sanitizer_cov_trace_switch+0x45/0x70
[   66.087031][   T21]  notifier_call_chain+0xc0/0x230
[   66.092066][   T21]  call_netdevice_notifiers_info+0xb5/0x130
[   66.097977][   T21]  rollback_registered_many+0x75c/0xe70
[   66.103539][   T21]  ? netif_set_real_num_tx_queues+0x700/0x700
[   66.109606][   T21]  ? lock_downgrade+0x840/0x840
[   66.114502][   T21]  unregister_netdevice_many.part.0+0x16/0x1e0
[   66.120665][   T21]  unregister_netdevice_many+0x36/0x50
[   66.126117][   T21]  ip6gre_exit_batch_net+0x4e8/0x700
[   66.131400][   T21]  ? ip6gre_tunnel_link+0xf0/0xf0
[   66.136421][   T21]  ? rcu_read_lock_held_common+0x130/0x130
[   66.142221][   T21]  ? ip6gre_tunnel_link+0xf0/0xf0
[   66.147240][   T21]  ops_exit_list.isra.0+0x103/0x150
[   66.152425][   T21]  cleanup_net+0x511/0xa50
[   66.156840][   T21]  ? unregister_pernet_device+0x70/0x70
[   66.165081][   T21]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   66.171070][   T21]  ? _raw_spin_unlock_irq+0x1f/0x80
[   66.176266][   T21]  process_one_work+0x965/0x16a0
[   66.181219][   T21]  ? lock_release+0x800/0x800
[   66.185889][   T21]  ? pwq_dec_nr_in_flight+0x310/0x310
[   66.191242][   T21]  ? rwlock_bug.part.0+0x90/0x90
[   66.196185][   T21]  worker_thread+0x96/0xe20
[   66.200699][   T21]  ? process_one_work+0x16a0/0x16a0
[   66.205889][   T21]  kthread+0x38b/0x470
[   66.209949][   T21]  ? kthread_mod_delayed_work+0x1a0/0x1a0
[   66.215671][   T21]  ret_from_fork+0x24/0x30
[   67.552807][ T6842] can: request_module (can-proto-0) failed.
executing program
[   69.321938][ T6842] can: request_module (can-proto-0) failed.
[   69.334084][ T6842] can: request_module (can-proto-0) failed.