[[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 '10.128.0.199' (ECDSA) to the list of known hosts.
2020/04/20 23:36:45 fuzzer started
2020/04/20 23:36:47 connecting to host at 10.128.0.26:42693
2020/04/20 23:36:47 checking machine...
2020/04/20 23:36:47 checking revisions...
2020/04/20 23:36:47 testing simple program...
syzkaller login: [ 64.488532][ T6849] IPVS: ftp: loaded support on port[0] = 21
2020/04/20 23:36:47 building call list...
[ 64.691649][ T7]
[ 64.694086][ T7] =============================
[ 64.701195][ T7] WARNING: suspicious RCU usage
[ 64.706058][ T7] 5.7.0-rc2-next-20200420-syzkaller #0 Not tainted
[ 64.735571][ T7] -----------------------------
[ 64.756960][ T7] net/openvswitch/conntrack.c:1898 RCU-list traversed in non-reader section!!
[ 64.771341][ T7]
[ 64.771341][ T7] other info that might help us debug this:
[ 64.771341][ T7]
[ 64.782188][ T7]
[ 64.782188][ T7] rcu_scheduler_active = 2, debug_locks = 1
[ 64.790451][ T7] 3 locks held by kworker/u4:0/7:
[ 64.795470][ T7] #0: ffff8880a9772138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0
[ 64.805852][ T7] #1: ffffc90000cdfdc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0
[ 64.816143][ T7] #2: ffffffff8a5a26f0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50
[ 64.830225][ T7]
[ 64.830225][ T7] stack backtrace:
[ 64.845660][ T7] CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 5.7.0-rc2-next-20200420-syzkaller #0
[ 64.855060][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 64.865119][ T7] Workqueue: netns cleanup_net
[ 64.869911][ T7] Call Trace:
[ 64.873215][ T7] dump_stack+0x188/0x20d
[ 64.877560][ T7] ovs_ct_exit+0x3db/0x558
[ 64.881987][ T7] ovs_exit_net+0x1df/0xba0
[ 64.886485][ T7] ? synchronize_rcu.part.0+0xda/0xf0
[ 64.891855][ T7] ? synchronize_rcu_expedited+0x620/0x620
[ 64.897665][ T7] ? ovs_dp_cmd_del+0x270/0x270
[ 64.902517][ T7] ? ovs_dp_cmd_del+0x270/0x270
[ 64.907364][ T7] ops_exit_list.isra.0+0xa8/0x150
[ 64.912477][ T7] cleanup_net+0x511/0xa50
[ 64.916897][ T7] ? unregister_pernet_device+0x70/0x70
[ 64.922440][ T7] ? rcu_read_lock_any_held.part.0+0x50/0x50
[ 64.928561][ T7] ? _raw_spin_unlock_irq+0x1f/0x80
[ 64.933765][ T7] process_one_work+0x965/0x16a0
[ 64.938723][ T7] ? lock_release+0x800/0x800
[ 64.943401][ T7] ? pwq_dec_nr_in_flight+0x310/0x310
[ 64.948774][ T7] ? rwlock_bug.part.0+0x90/0x90
[ 64.953745][ T7] worker_thread+0x96/0xe20
[ 64.958293][ T7] ? process_one_work+0x16a0/0x16a0
[ 64.963500][ T7] kthread+0x38b/0x470
[ 64.967572][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0
[ 64.973297][ T7] ret_from_fork+0x24/0x30
[ 65.180157][ T7] tipc: TX() has been purged, node left!
[ 65.222487][ T7]
[ 65.224924][ T7] =============================
[ 65.229759][ T7] WARNING: suspicious RCU usage
[ 65.236280][ T7] 5.7.0-rc2-next-20200420-syzkaller #0 Not tainted
[ 65.244527][ T7] -----------------------------
[ 65.249457][ T7] net/ipv4/ipmr.c:1757 RCU-list traversed in non-reader section!!
[ 65.258537][ T7]
[ 65.258537][ T7] other info that might help us debug this:
[ 65.258537][ T7]
[ 65.269682][ T7]
[ 65.269682][ T7] rcu_scheduler_active = 2, debug_locks = 1
[ 65.278598][ T7] 4 locks held by kworker/u4:0/7:
[ 65.284429][ T7] #0: ffff8880a9772138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0
[ 65.295478][ T7] #1: ffffc90000cdfdc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0
[ 65.306315][ T7] #2: ffffffff8a5a26f0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50
[ 65.316491][ T7] #3: ffffffff8a5ae668 (rtnl_mutex){+.+.}-{3:3}, at: ip6gre_exit_batch_net+0x88/0x700
[ 65.326910][ T7]
[ 65.326910][ T7] stack backtrace:
[ 65.333589][ T7] CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 5.7.0-rc2-next-20200420-syzkaller #0
[ 65.342951][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 65.353002][ T7] Workqueue: netns cleanup_net
[ 65.358534][ T7] Call Trace:
[ 65.361821][ T7] dump_stack+0x188/0x20d
[ 65.366151][ T7] ipmr_device_event+0x240/0x2b0
[ 65.371090][ T7] ? __sanitizer_cov_trace_switch+0x45/0x70
[ 65.376992][ T7] notifier_call_chain+0xc0/0x230
[ 65.382024][ T7] call_netdevice_notifiers_info+0xb5/0x130
[ 65.387920][ T7] rollback_registered_many+0x75c/0xe70
[ 65.393484][ T7] ? netif_set_real_num_tx_queues+0x700/0x700
[ 65.399556][ T7] ? lock_downgrade+0x840/0x840
[ 65.404430][ T7] unregister_netdevice_many.part.0+0x16/0x1e0
[ 65.410582][ T7] unregister_netdevice_many+0x36/0x50
[ 65.416033][ T7] ip6gre_exit_batch_net+0x4e8/0x700
[ 65.421315][ T7] ? ip6gre_tunnel_link+0xf0/0xf0
[ 65.426332][ T7] ? rcu_read_lock_held_common+0x130/0x130
[ 65.432137][ T7] ? ip6gre_tunnel_link+0xf0/0xf0
[ 65.437158][ T7] ops_exit_list.isra.0+0x103/0x150
[ 65.442358][ T7] cleanup_net+0x511/0xa50
[ 65.446773][ T7] ? unregister_pernet_device+0x70/0x70
[ 65.452323][ T7] ? rcu_read_lock_any_held.part.0+0x50/0x50
[ 65.458296][ T7] ? _raw_spin_unlock_irq+0x1f/0x80
[ 65.463497][ T7] process_one_work+0x965/0x16a0
[ 65.468437][ T7] ? lock_release+0x800/0x800
[ 65.473110][ T7] ? pwq_dec_nr_in_flight+0x310/0x310
[ 65.478479][ T7] ? rwlock_bug.part.0+0x90/0x90
[ 65.483420][ T7] worker_thread+0x96/0xe20
[ 65.487931][ T7] ? process_one_work+0x16a0/0x16a0
[ 65.493125][ T7] kthread+0x38b/0x470
[ 65.497382][ T7] ? kthread_mod_delayed_work+0x1a0/0x1a0
[ 65.503099][ T7] ret_from_fork+0x24/0x30
[ 66.536664][ T6829] can: request_module (can-proto-0) failed.
executing program
[ 68.677965][ T6829] can: request_module (can-proto-0) failed.
[ 68.689794][ T6829] can: request_module (can-proto-0) failed.