[ 86.827239][ T27] audit: type=1800 audit(1585109644.347:26): pid=9980 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. [ 87.753305][ T27] kauditd_printk_skb: 2 callbacks suppressed [ 87.753317][ T27] audit: type=1800 audit(1585109645.297:29): pid=9980 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 [ 87.797335][ T27] audit: type=1800 audit(1585109645.307:30): pid=9980 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 '10.128.0.121' (ECDSA) to the list of known hosts. 2020/03/25 04:14:14 fuzzer started 2020/03/25 04:14:16 connecting to host at 10.128.0.26:38821 2020/03/25 04:14:16 checking machine... 2020/03/25 04:14:16 checking revisions... 2020/03/25 04:14:16 testing simple program... syzkaller login: [ 99.076262][T10151] IPVS: ftp: loaded support on port[0] = 21 2020/03/25 04:14:16 building call list... [ 99.278260][ T115] [ 99.280746][ T115] ============================= [ 99.285956][ T115] WARNING: suspicious RCU usage [ 99.304367][ T115] 5.6.0-rc7-next-20200324-syzkaller #0 Not tainted [ 99.318921][ T115] ----------------------------- [ 99.324936][ T115] net/openvswitch/conntrack.c:1898 RCU-list traversed in non-reader section!! [ 99.334188][ T115] [ 99.334188][ T115] other info that might help us debug this: [ 99.334188][ T115] [ 99.344956][ T115] [ 99.344956][ T115] rcu_scheduler_active = 2, debug_locks = 1 [ 99.354871][ T115] 3 locks held by kworker/u4:3/115: [ 99.360593][ T115] #0: ffff88821b78d928 ((wq_completion)netns){+.+.}, at: process_one_work+0x82a/0x1690 [ 99.370925][ T115] #1: ffffc90000e57dd0 (net_cleanup_work){+.+.}, at: process_one_work+0x85e/0x1690 [ 99.380999][ T115] #2: ffffffff8a55f388 (pernet_ops_rwsem){++++}, at: cleanup_net+0x9b/0xa50 [ 99.390257][ T115] [ 99.390257][ T115] stack backtrace: [ 99.396276][ T115] CPU: 1 PID: 115 Comm: kworker/u4:3 Not tainted 5.6.0-rc7-next-20200324-syzkaller #0 [ 99.405830][ T115] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 99.415910][ T115] Workqueue: netns cleanup_net [ 99.420668][ T115] Call Trace: [ 99.423980][ T115] dump_stack+0x188/0x20d [ 99.428336][ T115] ovs_ct_exit+0x3db/0x558 [ 99.432788][ T115] ovs_exit_net+0x1df/0xba0 [ 99.437669][ T115] ? ovs_dp_cmd_del+0x270/0x270 [ 99.442542][ T115] ? __mutex_unlock_slowpath+0xe2/0x660 [ 99.448112][ T115] ? ovs_dp_cmd_del+0x270/0x270 [ 99.452969][ T115] ops_exit_list.isra.0+0xa8/0x150 [ 99.458077][ T115] cleanup_net+0x511/0xa50 [ 99.462496][ T115] ? unregister_pernet_device+0x70/0x70 [ 99.468050][ T115] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 99.474050][ T115] process_one_work+0x94b/0x1690 [ 99.479010][ T115] ? pwq_dec_nr_in_flight+0x310/0x310 [ 99.484430][ T115] ? do_raw_spin_lock+0x129/0x2e0 [ 99.489689][ T115] worker_thread+0x96/0xe20 [ 99.494235][ T115] ? process_one_work+0x1690/0x1690 [ 99.499435][ T115] kthread+0x357/0x430 [ 99.503523][ T115] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 99.509354][ T115] ret_from_fork+0x24/0x30 [ 99.687330][ T115] tipc: TX() has been purged, node left! [ 99.729420][ T115] [ 99.731900][ T115] ============================= [ 99.736745][ T115] WARNING: suspicious RCU usage [ 99.742220][ T115] 5.6.0-rc7-next-20200324-syzkaller #0 Not tainted [ 99.749137][ T115] ----------------------------- [ 99.754032][ T115] net/ipv4/ipmr.c:1757 RCU-list traversed in non-reader section!! [ 99.762400][ T115] [ 99.762400][ T115] other info that might help us debug this: [ 99.762400][ T115] [ 99.773208][ T115] [ 99.773208][ T115] rcu_scheduler_active = 2, debug_locks = 1 [ 99.782638][ T115] 4 locks held by kworker/u4:3/115: [ 99.788315][ T115] #0: ffff88821b78d928 ((wq_completion)netns){+.+.}, at: process_one_work+0x82a/0x1690 [ 99.798762][ T115] #1: ffffc90000e57dd0 (net_cleanup_work){+.+.}, at: process_one_work+0x85e/0x1690 [ 99.809102][ T115] #2: ffffffff8a55f388 (pernet_ops_rwsem){++++}, at: cleanup_net+0x9b/0xa50 [ 99.818422][ T115] #3: ffffffff8a56b100 (rtnl_mutex){+.+.}, at: ip6gre_exit_batch_net+0x88/0x700 [ 99.828019][ T115] [ 99.828019][ T115] stack backtrace: [ 99.833974][ T115] CPU: 1 PID: 115 Comm: kworker/u4:3 Not tainted 5.6.0-rc7-next-20200324-syzkaller #0 [ 99.843512][ T115] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 99.853590][ T115] Workqueue: netns cleanup_net [ 99.858345][ T115] Call Trace: [ 99.861640][ T115] dump_stack+0x188/0x20d [ 99.865981][ T115] ipmr_device_event+0x240/0x2b0 [ 99.870919][ T115] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 99.876854][ T115] notifier_call_chain+0xc0/0x230 [ 99.881887][ T115] call_netdevice_notifiers_info+0xb5/0x130 [ 99.887789][ T115] rollback_registered_many+0x75c/0xe70 [ 99.893338][ T115] ? netif_set_real_num_tx_queues+0x700/0x700 [ 99.899420][ T115] ? lock_downgrade+0x7f0/0x7f0 [ 99.904276][ T115] unregister_netdevice_many.part.0+0x16/0x1e0 [ 99.910486][ T115] unregister_netdevice_many+0x36/0x50 [ 99.915966][ T115] ip6gre_exit_batch_net+0x4e8/0x700 [ 99.921372][ T115] ? ip6gre_tunnel_link+0xf0/0xf0 [ 99.926504][ T115] ? rcu_read_lock_held_common+0x130/0x130 [ 99.932339][ T115] ? ip6gre_tunnel_link+0xf0/0xf0 [ 99.937374][ T115] ops_exit_list.isra.0+0x103/0x150 [ 99.942592][ T115] cleanup_net+0x511/0xa50 [ 99.947015][ T115] ? unregister_pernet_device+0x70/0x70 [ 99.952586][ T115] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 99.958580][ T115] process_one_work+0x94b/0x1690 [ 99.963531][ T115] ? pwq_dec_nr_in_flight+0x310/0x310 [ 99.968899][ T115] ? do_raw_spin_lock+0x129/0x2e0 [ 99.973933][ T115] worker_thread+0x96/0xe20 [ 99.978449][ T115] ? process_one_work+0x1690/0x1690 [ 99.983651][ T115] kthread+0x357/0x430 [ 99.987734][ T115] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 99.993460][ T115] ret_from_fork+0x24/0x30 [ 100.980329][T10132] can: request_module (can-proto-0) failed. executing program [ 103.086312][T10132] can: request_module (can-proto-0) failed. [ 103.098911][T10132] can: request_module (can-proto-0) failed.