[ 80.547937][ T27] audit: type=1800 audit(1585039322.908:26): pid=9666 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 81.396850][ T27] kauditd_printk_skb: 2 callbacks suppressed [ 81.396862][ T27] audit: type=1800 audit(1585039323.778:29): pid=9666 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 81.437639][ T27] audit: type=1800 audit(1585039323.778:30): pid=9666 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.60' (ECDSA) to the list of known hosts. 2020/03/24 08:42:15 fuzzer started 2020/03/24 08:42:16 connecting to host at 10.128.0.26:37547 2020/03/24 08:42:16 checking machine... 2020/03/24 08:42:16 checking revisions... 2020/03/24 08:42:16 testing simple program... 2020/03/24 08:42:16 building call list... syzkaller login: [ 94.266346][ T9833] IPVS: ftp: loaded support on port[0] = 21 [ 94.458155][ T380] [ 94.467576][ T380] ============================= [ 94.472450][ T380] WARNING: suspicious RCU usage [ 94.477292][ T380] 5.6.0-rc7-next-20200324-syzkaller #0 Not tainted [ 94.484307][ T380] ----------------------------- [ 94.489575][ T380] net/openvswitch/conntrack.c:1898 RCU-list traversed in non-reader section!! [ 94.498718][ T380] [ 94.498718][ T380] other info that might help us debug this: [ 94.498718][ T380] [ 94.509747][ T380] [ 94.509747][ T380] rcu_scheduler_active = 2, debug_locks = 1 [ 94.517969][ T380] 3 locks held by kworker/u4:6/380: [ 94.523401][ T380] #0: ffff88821b78d928 ((wq_completion)netns){+.+.}, at: process_one_work+0x82a/0x1690 [ 94.533575][ T380] #1: ffffc900022a7dd0 (net_cleanup_work){+.+.}, at: process_one_work+0x85e/0x1690 [ 94.543352][ T380] #2: ffffffff8a55f388 (pernet_ops_rwsem){++++}, at: cleanup_net+0x9b/0xa50 [ 94.552531][ T380] [ 94.552531][ T380] stack backtrace: [ 94.573208][ T380] CPU: 0 PID: 380 Comm: kworker/u4:6 Not tainted 5.6.0-rc7-next-20200324-syzkaller #0 [ 94.582845][ T380] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 94.592904][ T380] Workqueue: netns cleanup_net [ 94.597660][ T380] Call Trace: [ 94.600953][ T380] dump_stack+0x188/0x20d [ 94.605290][ T380] ovs_ct_exit+0x3db/0x558 [ 94.609714][ T380] ovs_exit_net+0x1df/0xba0 [ 94.614223][ T380] ? ovs_dp_cmd_del+0x270/0x270 [ 94.619075][ T380] ? __mutex_unlock_slowpath+0xe2/0x660 [ 94.624628][ T380] ? ovs_dp_cmd_del+0x270/0x270 [ 94.629504][ T380] ops_exit_list.isra.0+0xa8/0x150 [ 94.634632][ T380] cleanup_net+0x511/0xa50 [ 94.639227][ T380] ? unregister_pernet_device+0x70/0x70 [ 94.644776][ T380] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 94.650766][ T380] process_one_work+0x94b/0x1690 [ 94.655726][ T380] ? pwq_dec_nr_in_flight+0x310/0x310 [ 94.661100][ T380] ? do_raw_spin_lock+0x129/0x2e0 [ 94.666144][ T380] worker_thread+0x96/0xe20 [ 94.670657][ T380] ? process_one_work+0x1690/0x1690 [ 94.675856][ T380] kthread+0x357/0x430 [ 94.679924][ T380] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 94.685653][ T380] ret_from_fork+0x24/0x30 [ 94.877875][ T380] tipc: TX() has been purged, node left! [ 94.921420][ T380] [ 94.923873][ T380] ============================= [ 94.929235][ T380] WARNING: suspicious RCU usage [ 94.934158][ T380] 5.6.0-rc7-next-20200324-syzkaller #0 Not tainted [ 94.941308][ T380] ----------------------------- [ 94.946209][ T380] net/ipv4/ipmr.c:1757 RCU-list traversed in non-reader section!! [ 94.954488][ T380] [ 94.954488][ T380] other info that might help us debug this: [ 94.954488][ T380] [ 94.965409][ T380] [ 94.965409][ T380] rcu_scheduler_active = 2, debug_locks = 1 [ 94.975722][ T380] 4 locks held by kworker/u4:6/380: [ 94.981304][ T380] #0: ffff88821b78d928 ((wq_completion)netns){+.+.}, at: process_one_work+0x82a/0x1690 [ 94.991800][ T380] #1: ffffc900022a7dd0 (net_cleanup_work){+.+.}, at: process_one_work+0x85e/0x1690 [ 95.001694][ T380] #2: ffffffff8a55f388 (pernet_ops_rwsem){++++}, at: cleanup_net+0x9b/0xa50 [ 95.010917][ T380] #3: ffffffff8a56b100 (rtnl_mutex){+.+.}, at: ip6gre_exit_batch_net+0x88/0x700 [ 95.020525][ T380] [ 95.020525][ T380] stack backtrace: [ 95.026457][ T380] CPU: 1 PID: 380 Comm: kworker/u4:6 Not tainted 5.6.0-rc7-next-20200324-syzkaller #0 [ 95.035991][ T380] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 95.046078][ T380] Workqueue: netns cleanup_net [ 95.050836][ T380] Call Trace: [ 95.054129][ T380] dump_stack+0x188/0x20d [ 95.058476][ T380] ipmr_device_event+0x240/0x2b0 [ 95.063422][ T380] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 95.069406][ T380] notifier_call_chain+0xc0/0x230 [ 95.074453][ T380] call_netdevice_notifiers_info+0xb5/0x130 [ 95.080360][ T380] rollback_registered_many+0x75c/0xe70 [ 95.085915][ T380] ? netif_set_real_num_tx_queues+0x700/0x700 [ 95.092051][ T380] ? lock_downgrade+0x7f0/0x7f0 [ 95.096929][ T380] unregister_netdevice_many.part.0+0x16/0x1e0 [ 95.103240][ T380] unregister_netdevice_many+0x36/0x50 [ 95.108729][ T380] ip6gre_exit_batch_net+0x4e8/0x700 [ 95.114042][ T380] ? ip6gre_tunnel_link+0xf0/0xf0 [ 95.119087][ T380] ? rcu_read_lock_held_common+0x130/0x130 [ 95.124912][ T380] ? ip6gre_tunnel_link+0xf0/0xf0 [ 95.130099][ T380] ops_exit_list.isra.0+0x103/0x150 [ 95.135398][ T380] cleanup_net+0x511/0xa50 [ 95.139821][ T380] ? unregister_pernet_device+0x70/0x70 [ 95.145379][ T380] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 95.151496][ T380] process_one_work+0x94b/0x1690 [ 95.156470][ T380] ? pwq_dec_nr_in_flight+0x310/0x310 [ 95.161847][ T380] ? do_raw_spin_lock+0x129/0x2e0 [ 95.166902][ T380] worker_thread+0x96/0xe20 [ 95.171415][ T380] ? process_one_work+0x1690/0x1690 [ 95.176635][ T380] kthread+0x357/0x430 [ 95.180696][ T380] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 95.186421][ T380] ret_from_fork+0x24/0x30 [ 96.160220][ T9837] can: request_module (can-proto-0) failed. executing program [ 98.486277][ T9837] can: request_module (can-proto-0) failed. [ 98.498862][ T9837] can: request_module (can-proto-0) failed.