[[0;32m OK [0m] Reached target Login Prompts.
[[0;32m OK [0m] Reached target Multi-User System.
[[0;32m OK [0m] Reached target Graphical Interface.
Starting Update UTMP about System Runlevel Changes...
[[0;32m OK [0m] Started Update UTMP about System Runlevel Changes.
Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.1.50' (ECDSA) to the list of known hosts.
2020/04/17 19:24:42 fuzzer started
2020/04/17 19:24:44 connecting to host at 10.128.0.26:38123
2020/04/17 19:24:44 checking machine...
2020/04/17 19:24:44 checking revisions...
2020/04/17 19:24:44 testing simple program...
syzkaller login: [ 61.039895][ T6837] IPVS: ftp: loaded support on port[0] = 21
2020/04/17 19:24:45 building call list...
[ 61.212160][ T21]
[ 61.214683][ T21] =============================
[ 61.220332][ T21] WARNING: suspicious RCU usage
[ 61.245627][ T21] 5.7.0-rc1-next-20200417-syzkaller #0 Not tainted
[ 61.255138][ T21] -----------------------------
[ 61.266962][ T21] net/openvswitch/conntrack.c:1898 RCU-list traversed in non-reader section!!
[ 61.305808][ T21]
[ 61.305808][ T21] other info that might help us debug this:
[ 61.305808][ T21]
[ 61.317524][ T21]
[ 61.317524][ T21] rcu_scheduler_active = 2, debug_locks = 1
[ 61.326877][ T21] 3 locks held by kworker/u4:1/21:
[ 61.333315][ T21] #0: ffff8880a977a138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0
[ 61.344188][ T21] #1: ffffc90000dd7dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0
[ 61.354829][ T21] #2: ffffffff8a5a08f0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50
[ 61.364753][ T21]
[ 61.364753][ T21] stack backtrace:
[ 61.370668][ T21] CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 5.7.0-rc1-next-20200417-syzkaller #0
[ 61.380142][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 61.390223][ T21] Workqueue: netns cleanup_net
[ 61.397086][ T21] Call Trace:
[ 61.400384][ T21] dump_stack+0x188/0x20d
[ 61.404755][ T21] ovs_ct_exit+0x3db/0x558
[ 61.409197][ T21] ovs_exit_net+0x1df/0xba0
[ 61.413715][ T21] ? synchronize_rcu.part.0+0xda/0xf0
[ 61.419116][ T21] ? synchronize_rcu_expedited+0x620/0x620
[ 61.425198][ T21] ? ovs_dp_cmd_del+0x270/0x270
[ 61.430085][ T21] ? ovs_dp_cmd_del+0x270/0x270
[ 61.435745][ T21] ops_exit_list.isra.0+0xa8/0x150
[ 61.440898][ T21] cleanup_net+0x511/0xa50
[ 61.445327][ T21] ? unregister_pernet_device+0x70/0x70
[ 61.450877][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50
[ 61.456873][ T21] ? _raw_spin_unlock_irq+0x1f/0x80
[ 61.462090][ T21] process_one_work+0x965/0x16a0
[ 61.467051][ T21] ? lock_release+0x800/0x800
[ 61.471744][ T21] ? pwq_dec_nr_in_flight+0x310/0x310
[ 61.477144][ T21] ? rwlock_bug.part.0+0x90/0x90
[ 61.482098][ T21] worker_thread+0x96/0xe20
[ 61.486614][ T21] ? process_one_work+0x16a0/0x16a0
[ 61.491815][ T21] kthread+0x388/0x470
[ 61.495894][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0
[ 61.501624][ T21] ret_from_fork+0x24/0x30
[ 61.681612][ T21] tipc: TX() has been purged, node left!
[ 61.723913][ T21]
[ 61.726378][ T21] =============================
[ 61.733565][ T21] WARNING: suspicious RCU usage
[ 61.738530][ T21] 5.7.0-rc1-next-20200417-syzkaller #0 Not tainted
[ 61.746517][ T21] -----------------------------
[ 61.752518][ T21] net/ipv4/ipmr.c:1757 RCU-list traversed in non-reader section!!
[ 61.760411][ T21]
[ 61.760411][ T21] other info that might help us debug this:
[ 61.760411][ T21]
[ 61.772491][ T21]
[ 61.772491][ T21] rcu_scheduler_active = 2, debug_locks = 1
[ 61.780764][ T21] 4 locks held by kworker/u4:1/21:
[ 61.787444][ T21] #0: ffff8880a977a138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0
[ 61.798954][ T21] #1: ffffc90000dd7dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0
[ 61.825472][ T21] #2: ffffffff8a5a08f0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50
[ 61.835094][ T21] #3: ffffffff8a5ac868 (rtnl_mutex){+.+.}-{3:3}, at: ip6gre_exit_batch_net+0x88/0x700
[ 61.845823][ T21]
[ 61.845823][ T21] stack backtrace:
[ 61.851856][ T21] CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 5.7.0-rc1-next-20200417-syzkaller #0
[ 61.861602][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 61.871793][ T21] Workqueue: netns cleanup_net
[ 61.877306][ T21] Call Trace:
[ 61.880629][ T21] dump_stack+0x188/0x20d
[ 61.884972][ T21] ipmr_device_event+0x240/0x2b0
[ 61.890445][ T21] ? __sanitizer_cov_trace_switch+0x45/0x70
[ 61.896416][ T21] notifier_call_chain+0xc0/0x230
[ 61.901496][ T21] call_netdevice_notifiers_info+0xb5/0x130
[ 61.908626][ T21] rollback_registered_many+0x75c/0xe70
[ 61.914205][ T21] ? netif_set_real_num_tx_queues+0x700/0x700
[ 61.920329][ T21] ? lock_downgrade+0x840/0x840
[ 61.925200][ T21] unregister_netdevice_many.part.0+0x16/0x1e0
[ 61.931362][ T21] unregister_netdevice_many+0x36/0x50
[ 61.937180][ T21] ip6gre_exit_batch_net+0x4e8/0x700
[ 61.942506][ T21] ? ip6gre_tunnel_link+0xf0/0xf0
[ 61.947632][ T21] ? rcu_read_lock_held_common+0x130/0x130
[ 61.955732][ T21] ? ip6gre_tunnel_link+0xf0/0xf0
[ 61.961812][ T21] ops_exit_list.isra.0+0x103/0x150
[ 61.968601][ T21] cleanup_net+0x511/0xa50
[ 61.973033][ T21] ? unregister_pernet_device+0x70/0x70
[ 61.978589][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50
[ 61.984688][ T21] ? _raw_spin_unlock_irq+0x1f/0x80
[ 61.990141][ T21] process_one_work+0x965/0x16a0
[ 61.995113][ T21] ? lock_release+0x800/0x800
[ 61.999823][ T21] ? pwq_dec_nr_in_flight+0x310/0x310
[ 62.005244][ T21] ? rwlock_bug.part.0+0x90/0x90
[ 62.010397][ T21] worker_thread+0x96/0xe20
[ 62.014948][ T21] ? process_one_work+0x16a0/0x16a0
[ 62.020697][ T21] kthread+0x388/0x470
[ 62.025327][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0
[ 62.031757][ T21] ret_from_fork+0x24/0x30
[ 62.958670][ T6820] can: request_module (can-proto-0) failed.
executing program
[ 65.057329][ T6820] can: request_module (can-proto-0) failed.
[ 65.069940][ T6820] can: request_module (can-proto-0) failed.