[ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty2. [ OK ] Reached target Login Prompts. [ OK ] Started OpenBSD Secure Shell server. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.62' (ECDSA) to the list of known hosts. 2020/04/16 06:34:04 fuzzer started 2020/04/16 06:34:06 connecting to host at 10.128.0.26:34645 2020/04/16 06:34:06 checking machine... 2020/04/16 06:34:06 checking revisions... 2020/04/16 06:34:06 testing simple program... syzkaller login: [ 61.998553][ T7089] IPVS: ftp: loaded support on port[0] = 21 2020/04/16 06:34:06 building call list... [ 62.234499][ T7028] [ 62.237021][ T7028] ============================= [ 62.241874][ T7028] WARNING: suspicious RCU usage [ 62.253453][ T7028] 5.7.0-rc1-next-20200416-syzkaller #0 Not tainted [ 62.259997][ T7028] ----------------------------- [ 62.267139][ T7028] net/openvswitch/conntrack.c:1898 RCU-list traversed in non-reader section!! [ 62.277088][ T7028] [ 62.277088][ T7028] other info that might help us debug this: [ 62.277088][ T7028] [ 62.289719][ T7028] [ 62.289719][ T7028] rcu_scheduler_active = 2, debug_locks = 1 [ 62.298868][ T7028] 3 locks held by kworker/u4:9/7028: [ 62.308634][ T7028] #0: ffff8880a977a138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 [ 62.323585][ T7028] #1: ffffc90001757dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 [ 62.336788][ T7028] #2: ffffffff8a59fdf0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50 [ 62.347861][ T7028] [ 62.347861][ T7028] stack backtrace: [ 62.354816][ T7028] CPU: 1 PID: 7028 Comm: kworker/u4:9 Not tainted 5.7.0-rc1-next-20200416-syzkaller #0 [ 62.367430][ T7028] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.378941][ T7028] Workqueue: netns cleanup_net [ 62.383731][ T7028] Call Trace: [ 62.387215][ T7028] dump_stack+0x188/0x20d [ 62.392088][ T7028] ovs_ct_exit+0x3db/0x558 [ 62.396621][ T7028] ovs_exit_net+0x1df/0xba0 [ 62.401222][ T7028] ? synchronize_rcu.part.0+0xda/0xf0 [ 62.406601][ T7028] ? synchronize_rcu_expedited+0x620/0x620 [ 62.413042][ T7028] ? ovs_dp_cmd_del+0x270/0x270 [ 62.418013][ T7028] ? ovs_dp_cmd_del+0x270/0x270 [ 62.423708][ T7028] ops_exit_list.isra.0+0xa8/0x150 [ 62.429854][ T7028] cleanup_net+0x511/0xa50 [ 62.434470][ T7028] ? unregister_pernet_device+0x70/0x70 [ 62.440771][ T7028] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.447746][ T7028] ? _raw_spin_unlock_irq+0x1f/0x80 [ 62.453572][ T7028] process_one_work+0x965/0x16a0 [ 62.461250][ T7028] ? lock_release+0x800/0x800 [ 62.465937][ T7028] ? pwq_dec_nr_in_flight+0x310/0x310 [ 62.471491][ T7028] ? rwlock_bug.part.0+0x90/0x90 [ 62.476543][ T7028] worker_thread+0x96/0xe20 [ 62.481090][ T7028] ? process_one_work+0x16a0/0x16a0 [ 62.486901][ T7028] kthread+0x388/0x470 [ 62.490973][ T7028] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 62.496704][ T7028] ret_from_fork+0x24/0x30 [ 62.672134][ T7028] tipc: TX() has been purged, node left! [ 62.714487][ T7028] [ 62.716958][ T7028] ============================= [ 62.723406][ T7028] WARNING: suspicious RCU usage [ 62.728729][ T7028] 5.7.0-rc1-next-20200416-syzkaller #0 Not tainted [ 62.738265][ T7028] ----------------------------- [ 62.745253][ T7028] net/ipv4/ipmr.c:1757 RCU-list traversed in non-reader section!! [ 62.754327][ T7028] [ 62.754327][ T7028] other info that might help us debug this: [ 62.754327][ T7028] [ 62.765638][ T7028] [ 62.765638][ T7028] rcu_scheduler_active = 2, debug_locks = 1 [ 62.774823][ T7028] 4 locks held by kworker/u4:9/7028: [ 62.780182][ T7028] #0: ffff8880a977a138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 [ 62.791898][ T7028] #1: ffffc90001757dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 [ 62.803317][ T7028] #2: ffffffff8a59fdf0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50 [ 62.814443][ T7028] #3: ffffffff8a5abd68 (rtnl_mutex){+.+.}-{3:3}, at: ip6gre_exit_batch_net+0x88/0x700 [ 62.825487][ T7028] [ 62.825487][ T7028] stack backtrace: [ 62.831541][ T7028] CPU: 1 PID: 7028 Comm: kworker/u4:9 Not tainted 5.7.0-rc1-next-20200416-syzkaller #0 [ 62.841187][ T7028] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.851443][ T7028] Workqueue: netns cleanup_net [ 62.856385][ T7028] Call Trace: [ 62.859693][ T7028] dump_stack+0x188/0x20d [ 62.864149][ T7028] ipmr_device_event+0x240/0x2b0 [ 62.869105][ T7028] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 62.875018][ T7028] notifier_call_chain+0xc0/0x230 [ 62.880077][ T7028] call_netdevice_notifiers_info+0xb5/0x130 [ 62.885977][ T7028] rollback_registered_many+0x75c/0xe70 [ 62.891619][ T7028] ? netif_set_real_num_tx_queues+0x700/0x700 [ 62.897818][ T7028] ? lock_downgrade+0x840/0x840 [ 62.902709][ T7028] unregister_netdevice_many.part.0+0x16/0x1e0 [ 62.908893][ T7028] unregister_netdevice_many+0x36/0x50 [ 62.914380][ T7028] ip6gre_exit_batch_net+0x4e8/0x700 [ 62.919691][ T7028] ? ip6gre_tunnel_link+0xf0/0xf0 [ 62.924729][ T7028] ? rcu_read_lock_held_common+0x130/0x130 [ 62.930546][ T7028] ? ip6gre_tunnel_link+0xf0/0xf0 [ 62.935761][ T7028] ops_exit_list.isra.0+0x103/0x150 [ 62.940964][ T7028] cleanup_net+0x511/0xa50 [ 62.945383][ T7028] ? unregister_pernet_device+0x70/0x70 [ 62.951439][ T7028] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.957422][ T7028] ? _raw_spin_unlock_irq+0x1f/0x80 [ 62.962640][ T7028] process_one_work+0x965/0x16a0 [ 62.967590][ T7028] ? lock_release+0x800/0x800 [ 62.972272][ T7028] ? pwq_dec_nr_in_flight+0x310/0x310 [ 62.977678][ T7028] ? rwlock_bug.part.0+0x90/0x90 [ 62.982642][ T7028] worker_thread+0x96/0xe20 [ 62.987248][ T7028] ? process_one_work+0x16a0/0x16a0 [ 62.992449][ T7028] kthread+0x388/0x470 [ 62.996522][ T7028] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 63.002245][ T7028] ret_from_fork+0x24/0x30 [ 63.980346][ T7072] can: request_module (can-proto-0) failed. executing program [ 66.088367][ T7072] can: request_module (can-proto-0) failed. [ 66.102148][ T7072] can: request_module (can-proto-0) failed.