[ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. Starting Load/Save RF Kill Switch Status... [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ 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 Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.160' (ECDSA) to the list of known hosts. 2020/04/16 06:34:03 fuzzer started 2020/04/16 06:34:05 connecting to host at 10.128.0.26:43071 2020/04/16 06:34:05 checking machine... 2020/04/16 06:34:05 checking revisions... 2020/04/16 06:34:05 testing simple program... syzkaller login: [ 62.279640][ T7103] IPVS: ftp: loaded support on port[0] = 21 2020/04/16 06:34:06 building call list... [ 62.547758][ T394] [ 62.550236][ T394] ============================= [ 62.555176][ T394] WARNING: suspicious RCU usage [ 62.565768][ T394] 5.7.0-rc1-next-20200416-syzkaller #0 Not tainted [ 62.573374][ T394] ----------------------------- [ 62.589911][ T394] net/openvswitch/conntrack.c:1898 RCU-list traversed in non-reader section!! [ 62.600171][ T394] [ 62.600171][ T394] other info that might help us debug this: [ 62.600171][ T394] [ 62.611330][ T394] [ 62.611330][ T394] rcu_scheduler_active = 2, debug_locks = 1 [ 62.620382][ T394] 3 locks held by kworker/u4:4/394: [ 62.625597][ T394] #0: ffff8880a977a138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 [ 62.637305][ T394] #1: ffffc90001fa7dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 [ 62.649431][ T394] #2: ffffffff8a59fdf0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50 [ 62.659869][ T394] [ 62.659869][ T394] stack backtrace: [ 62.665801][ T394] CPU: 1 PID: 394 Comm: kworker/u4:4 Not tainted 5.7.0-rc1-next-20200416-syzkaller #0 [ 62.675362][ T394] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.685428][ T394] Workqueue: netns cleanup_net [ 62.691511][ T394] Call Trace: [ 62.694807][ T394] dump_stack+0x188/0x20d [ 62.699248][ T394] ovs_ct_exit+0x3db/0x558 [ 62.703688][ T394] ovs_exit_net+0x1df/0xba0 [ 62.708201][ T394] ? synchronize_rcu.part.0+0xda/0xf0 [ 62.713575][ T394] ? synchronize_rcu_expedited+0x620/0x620 [ 62.720107][ T394] ? ovs_dp_cmd_del+0x270/0x270 [ 62.724987][ T394] ? ovs_dp_cmd_del+0x270/0x270 [ 62.729857][ T394] ops_exit_list.isra.0+0xa8/0x150 [ 62.735006][ T394] cleanup_net+0x511/0xa50 [ 62.739445][ T394] ? unregister_pernet_device+0x70/0x70 [ 62.745018][ T394] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.751008][ T394] ? _raw_spin_unlock_irq+0x1f/0x80 [ 62.756222][ T394] process_one_work+0x965/0x16a0 [ 62.761271][ T394] ? lock_release+0x800/0x800 [ 62.765964][ T394] ? pwq_dec_nr_in_flight+0x310/0x310 [ 62.771377][ T394] ? rwlock_bug.part.0+0x90/0x90 [ 62.776340][ T394] worker_thread+0x96/0xe20 [ 62.781219][ T394] ? process_one_work+0x16a0/0x16a0 [ 62.786508][ T394] kthread+0x388/0x470 [ 62.790598][ T394] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.796411][ T394] ret_from_fork+0x24/0x30 [ 62.976479][ T394] tipc: TX() has been purged, node left! [ 63.018828][ T394] [ 63.021304][ T394] ============================= [ 63.026152][ T394] WARNING: suspicious RCU usage [ 63.032748][ T394] 5.7.0-rc1-next-20200416-syzkaller #0 Not tainted [ 63.040396][ T394] ----------------------------- [ 63.045298][ T394] net/ipv4/ipmr.c:1757 RCU-list traversed in non-reader section!! [ 63.055459][ T394] [ 63.055459][ T394] other info that might help us debug this: [ 63.055459][ T394] [ 63.066891][ T394] [ 63.066891][ T394] rcu_scheduler_active = 2, debug_locks = 1 [ 63.075108][ T394] 4 locks held by kworker/u4:4/394: [ 63.081709][ T394] #0: ffff8880a977a138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 [ 63.093160][ T394] #1: ffffc90001fa7dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 [ 63.104236][ T394] #2: ffffffff8a59fdf0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50 [ 63.114595][ T394] #3: ffffffff8a5abd68 (rtnl_mutex){+.+.}-{3:3}, at: ip6gre_exit_batch_net+0x88/0x700 [ 63.125481][ T394] [ 63.125481][ T394] stack backtrace: [ 63.134883][ T394] CPU: 1 PID: 394 Comm: kworker/u4:4 Not tainted 5.7.0-rc1-next-20200416-syzkaller #0 [ 63.144570][ T394] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.154648][ T394] Workqueue: netns cleanup_net [ 63.159416][ T394] Call Trace: [ 63.162720][ T394] dump_stack+0x188/0x20d [ 63.167069][ T394] ipmr_device_event+0x240/0x2b0 [ 63.172033][ T394] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 63.177949][ T394] notifier_call_chain+0xc0/0x230 [ 63.183025][ T394] call_netdevice_notifiers_info+0xb5/0x130 [ 63.188944][ T394] rollback_registered_many+0x75c/0xe70 [ 63.194634][ T394] ? netif_set_real_num_tx_queues+0x700/0x700 [ 63.200781][ T394] ? lock_downgrade+0x840/0x840 [ 63.205659][ T394] unregister_netdevice_many.part.0+0x16/0x1e0 [ 63.211832][ T394] unregister_netdevice_many+0x36/0x50 [ 63.217326][ T394] ip6gre_exit_batch_net+0x4e8/0x700 [ 63.222833][ T394] ? ip6gre_tunnel_link+0xf0/0xf0 [ 63.227863][ T394] ? rcu_read_lock_held_common+0x130/0x130 [ 63.233688][ T394] ? ip6gre_tunnel_link+0xf0/0xf0 [ 63.238734][ T394] ops_exit_list.isra.0+0x103/0x150 [ 63.244141][ T394] cleanup_net+0x511/0xa50 [ 63.248580][ T394] ? unregister_pernet_device+0x70/0x70 [ 63.254145][ T394] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 63.260142][ T394] ? _raw_spin_unlock_irq+0x1f/0x80 [ 63.265490][ T394] process_one_work+0x965/0x16a0 [ 63.270459][ T394] ? lock_release+0x800/0x800 [ 63.275189][ T394] ? pwq_dec_nr_in_flight+0x310/0x310 [ 63.280599][ T394] ? rwlock_bug.part.0+0x90/0x90 [ 63.285709][ T394] worker_thread+0x96/0xe20 [ 63.290377][ T394] ? process_one_work+0x16a0/0x16a0 [ 63.295673][ T394] kthread+0x388/0x470 [ 63.299759][ T394] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 63.305510][ T394] ret_from_fork+0x24/0x30 [ 64.283601][ T7088] can: request_module (can-proto-0) failed. executing program [ 66.361558][ T7088] can: request_module (can-proto-0) failed. [ 66.372794][ T7088] can: request_module (can-proto-0) failed.