[  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 '10.128.0.63' (ECDSA) to the list of known hosts.
2020/04/22 07:22:51 fuzzer started
syzkaller login: [   68.246328][ T6837] as (6837) used greatest stack depth: 22944 bytes left
2020/04/22 07:22:53 connecting to host at 10.128.0.26:33159
2020/04/22 07:22:53 checking machine...
2020/04/22 07:22:53 checking revisions...
2020/04/22 07:22:53 testing simple program...
[   69.032878][ T6848] IPVS: ftp: loaded support on port[0] = 21
2020/04/22 07:22:53 building call list...
[   69.444917][   T56] tipc: TX() has been purged, node left!
[   69.487301][   T56] 
[   69.489767][   T56] =============================
[   69.494609][   T56] WARNING: suspicious RCU usage
[   69.501319][   T56] 5.7.0-rc2-next-20200422-syzkaller #0 Not tainted
[   69.508851][   T56] -----------------------------
[   69.513754][   T56] net/ipv4/ipmr.c:1757 RCU-list traversed in non-reader section!!
[   69.534914][   T56] 
[   69.534914][   T56] other info that might help us debug this:
[   69.534914][   T56] 
[   69.564826][   T56] 
[   69.564826][   T56] rcu_scheduler_active = 2, debug_locks = 1
[   69.572933][   T56] 4 locks held by kworker/u4:2/56:
[   69.578724][   T56]  #0: ffff8880a9772138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0
[   69.589380][   T56]  #1: ffffc90000e97dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0
[   69.600980][   T56]  #2: ffffffff8a5a2cb0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50
[   69.610654][   T56]  #3: ffffffff8a5aec28 (rtnl_mutex){+.+.}-{3:3}, at: ip6gre_exit_batch_net+0x88/0x700
[   69.620704][   T56] 
[   69.620704][   T56] stack backtrace:
[   69.626943][   T56] CPU: 0 PID: 56 Comm: kworker/u4:2 Not tainted 5.7.0-rc2-next-20200422-syzkaller #0
[   69.636423][   T56] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   69.646500][   T56] Workqueue: netns cleanup_net
[   69.651259][   T56] Call Trace:
[   69.655339][   T56]  dump_stack+0x18f/0x20d
[   69.659677][   T56]  ipmr_device_event+0x240/0x2b0
[   69.664655][   T56]  ? __sanitizer_cov_trace_switch+0x45/0x70
[   69.670587][   T56]  notifier_call_chain+0xc0/0x230
[   69.675642][   T56]  call_netdevice_notifiers_info+0xb5/0x130
[   69.681558][   T56]  rollback_registered_many+0x75c/0xe70
[   69.687213][   T56]  ? netif_set_real_num_tx_queues+0x700/0x700
[   69.693301][   T56]  ? lock_downgrade+0x840/0x840
[   69.698163][   T56]  unregister_netdevice_many.part.0+0x16/0x1e0
[   69.704320][   T56]  unregister_netdevice_many+0x36/0x50
[   69.709780][   T56]  ip6gre_exit_batch_net+0x4e8/0x700
[   69.715067][   T56]  ? ip6gre_tunnel_link+0xf0/0xf0
[   69.720105][   T56]  ? rcu_read_lock_held_common+0x130/0x130
[   69.725932][   T56]  ? ip6gre_tunnel_link+0xf0/0xf0
[   69.730977][   T56]  ops_exit_list.isra.0+0x103/0x150
[   69.736187][   T56]  cleanup_net+0x511/0xa50
[   69.740625][   T56]  ? unregister_pernet_device+0x70/0x70
[   69.746191][   T56]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[   69.752188][   T56]  ? _raw_spin_unlock_irq+0x1f/0x80
[   69.757488][   T56]  process_one_work+0x965/0x16a0
[   69.762468][   T56]  ? lock_release+0x800/0x800
[   69.767166][   T56]  ? pwq_dec_nr_in_flight+0x310/0x310
[   69.772546][   T56]  ? rwlock_bug.part.0+0x90/0x90
[   69.779320][   T56]  worker_thread+0x96/0xe20
[   69.783943][   T56]  ? process_one_work+0x16a0/0x16a0
[   69.789143][   T56]  kthread+0x38b/0x470
[   69.793211][   T56]  ? kthread_mod_delayed_work+0x1a0/0x1a0
[   69.798933][   T56]  ret_from_fork+0x24/0x30
[   70.921765][ T6833] can: request_module (can-proto-0) failed.
executing program
[   72.942212][ T6833] can: request_module (can-proto-0) failed.
[   72.955716][ T6833] can: request_module (can-proto-0) failed.