[ 9.509258][ T134] rpm (134) used greatest stack depth: 24240 bytes left [ 10.245228][ T173] sctp: Hash tables configured (bind 32/56) [ 10.555567][ T185] ip (185) used greatest stack depth: 24192 bytes left [ 11.263089][ T204] ip (204) used greatest stack depth: 24080 bytes left [ 31.317754][ C1] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies. [ 31.349564][ C0] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies. [ 31.566513][ C0] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies. [ 31.967524][ C3] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies. [ 32.396679][ C1] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies. [ 32.655122][ C1] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies. [ 32.878746][ C1] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies. [ 33.556307][ C3] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies. [ 33.663036][ C0] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies. [ 96.058487][ T816] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this. [ 96.127240][ T819] br0: port 1(veth0) entered blocking state [ 96.127723][ T819] br0: port 1(veth0) entered disabled state [ 96.128471][ T819] veth0: entered allmulticast mode [ 96.132205][ T819] veth0: entered promiscuous mode [ 96.177095][ T820] br0: port 2(veth1) entered blocking state [ 96.177302][ T820] br0: port 2(veth1) entered disabled state [ 96.177493][ T820] veth1: entered allmulticast mode [ 96.179051][ T820] veth1: entered promiscuous mode [ 96.230712][ T821] br0: port 2(veth1) entered blocking state [ 96.231232][ T821] br0: port 2(veth1) entered forwarding state [ 96.231932][ T821] br0: port 1(veth0) entered blocking state [ 96.232213][ T821] br0: port 1(veth0) entered forwarding state [ 102.814993][ T840] nf_queue (840) used greatest stack depth: 23576 bytes left [ 102.818742][ T839] nf_queue (839) used greatest stack depth: 22688 bytes left [ 108.713957][ T12] [ 108.714051][ T12] ====================================================== [ 108.714169][ T12] WARNING: possible circular locking dependency detected [ 108.714280][ T12] 7.2.0-rc6-virtme #1 Not tainted [ 108.714371][ T12] ------------------------------------------------------ [ 108.714479][ T12] kworker/u16:0/12 is trying to acquire lock: [ 108.714598][ T12] ff1100000207cd08 ((&n->timer)){+.-.}-{0:0}, at: __timer_delete_sync+0xdb/0x130 [ 108.714773][ T12] [ 108.714773][ T12] but task is already holding lock: [ 108.714902][ T12] ff1100000cca6b58 (&tbl->lock){+.-.}-{3:3}, at: __neigh_ifdown.isra.0+0xa1/0xea0 [ 108.715054][ T12] [ 108.715054][ T12] which lock already depends on the new lock. [ 108.715054][ T12] [ 108.715226][ T12] [ 108.715226][ T12] the existing dependency chain (in reverse order) is: [ 108.715376][ T12] [ 108.715376][ T12] -> #1 (&tbl->lock){+.-.}-{3:3}: [ 108.715511][ T12] __lock_acquire+0x518/0xc20 [ 108.715615][ T12] lock_acquire.part.0+0xbc/0x260 [ 108.715707][ T12] _raw_spin_lock_bh+0x38/0x50 [ 108.715799][ T12] ___neigh_create+0x2be/0x1070 [ 108.715890][ T12] ip6_finish_output2+0xb8b/0x1310 [ 108.715983][ T12] ip6_finish_output+0x646/0xda0 [ 108.716083][ T12] ip6_output+0x23f/0x7f0 [ 108.716173][ T12] ndisc_send_skb+0xba3/0x1520 [ 108.716262][ T12] ndisc_send_ns+0xa9/0x120 [ 108.716353][ T12] ndisc_solicit+0x314/0x480 [ 108.716444][ T12] neigh_probe+0xb3/0x100 [ 108.716532][ T12] neigh_timer_handler+0x191/0x1210 [ 108.716627][ T12] call_timer_fn+0x163/0x4c0 [ 108.716715][ T12] __run_timers+0x68f/0xaa0 [ 108.716803][ T12] run_timer_softirq+0xf0/0x160 [ 108.716892][ T12] handle_softirqs+0x1d8/0x8f0 [ 108.716977][ T12] __irq_exit_rcu+0x103/0x1c0 [ 108.717060][ T12] irq_exit_rcu+0xe/0x30 [ 108.717143][ T12] sysvec_apic_timer_interrupt+0x9d/0xe0 [ 108.717247][ T12] asm_sysvec_apic_timer_interrupt+0x1a/0x20 [ 108.717352][ T12] pv_native_safe_halt+0xf/0x10 [ 108.717437][ T12] default_idle+0x9/0x10 [ 108.717521][ T12] default_idle_call+0x6e/0xb0 [ 108.717617][ T12] cpuidle_idle_call.constprop.0+0x237/0x410 [ 108.717722][ T12] do_idle+0xd8/0x180 [ 108.717806][ T12] cpu_startup_entry+0x53/0x70 [ 108.717889][ T12] rest_init+0x1f7/0x200 [ 108.717979][ T12] start_kernel+0x3af/0x3b0 [ 108.718067][ T12] x86_64_start_reservations+0x24/0x30 [ 108.718175][ T12] x86_64_start_kernel+0x12b/0x130 [ 108.718258][ T12] common_startup_64+0x13e/0x148 [ 108.718342][ T12] [ 108.718342][ T12] -> #0 ((&n->timer)){+.-.}-{0:0}: [ 108.718472][ T12] check_prev_add+0xd8/0xe90 [ 108.718564][ T12] validate_chain+0x6b8/0xc20 [ 108.718652][ T12] __lock_acquire+0x518/0xc20 [ 108.718735][ T12] lock_acquire.part.0+0xbc/0x260 [ 108.718819][ T12] __timer_delete_sync+0xea/0x130 [ 108.718908][ T12] neigh_flush_one+0x4bf/0x650 [ 108.718996][ T12] __neigh_ifdown.isra.0+0x1b5/0xea0 [ 108.719099][ T12] neigh_ifdown+0x10/0x20 [ 108.719182][ T12] fib_netdev_event+0x1a9/0x5d0 [ 108.719277][ T12] notifier_call_chain+0xae/0x300 [ 108.719361][ T12] netif_close_many+0x366/0x770 [ 108.719446][ T12] unregister_netdevice_many_notify+0x71a/0x1b40 [ 108.719553][ T12] default_device_exit_batch+0x38b/0x600 [ 108.719659][ T12] ops_undo_list+0x2ce/0x8f0 [ 108.719745][ T12] cleanup_net+0x431/0x890 [ 108.719832][ T12] process_one_work+0xdf8/0x1410 [ 108.719917][ T12] worker_thread+0x4f1/0xd60 [ 108.720002][ T12] kthread+0x367/0x460 [ 108.720086][ T12] ret_from_fork+0x4a4/0x720 [ 108.720222][ T12] ret_from_fork_asm+0x11/0x20 [ 108.720308][ T12] [ 108.720308][ T12] other info that might help us debug this: [ 108.720308][ T12] [ 108.720475][ T12] Possible unsafe locking scenario: [ 108.720475][ T12] [ 108.720656][ T12] CPU0 CPU1 [ 108.720740][ T12] ---- ---- [ 108.720824][ T12] lock(&tbl->lock); [ 108.720890][ T12] lock((&n->timer)); [ 108.721039][ T12] lock(&tbl->lock); [ 108.721148][ T12] lock((&n->timer)); [ 108.721212][ T12] [ 108.721212][ T12] *** DEADLOCK *** [ 108.721212][ T12] [ 108.721379][ T12] 5 locks held by kworker/u16:0/12: [ 108.721463][ T12] #0: ff110000019e1d40 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0xd55/0x1410 [ 108.721639][ T12] #1: ffa00000000c7d10 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0xdb7/0x1410 [ 108.721839][ T12] #2: ffffffff8cca9d28 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xbf/0x890 [ 108.721988][ T12] #3: ffffffff8ccc5580 (rtnl_mutex){+.+.}-{4:4}, at: default_device_exit_batch+0x9a/0x600 [ 108.722206][ T12] #4: ff1100000cca6b58 (&tbl->lock){+.-.}-{3:3}, at: __neigh_ifdown.isra.0+0xa1/0xea0 [ 108.722361][ T12] [ 108.722361][ T12] stack backtrace: [ 108.722465][ T12] CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 7.2.0-rc6-virtme #1 PREEMPT(full) [ 108.722468][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 108.722471][ T12] Workqueue: netns cleanup_net [ 108.722474][ T12] Call Trace: [ 108.722475][ T12] [ 108.722477][ T12] dump_stack_lvl+0x6f/0xa0 [ 108.722482][ T12] print_circular_bug.cold+0x38/0x46 [ 108.722485][ T12] check_noncircular+0x171/0x1a0 [ 108.722487][ T12] check_prev_add+0xd8/0xe90 [ 108.722489][ T12] ? do_raw_spin_unlock+0x59/0x250 [ 108.722490][ T12] ? look_up_lock_class+0x65/0x150 [ 108.722493][ T12] validate_chain+0x6b8/0xc20 [ 108.722495][ T12] __lock_acquire+0x518/0xc20 [ 108.722497][ T12] ? io_run_task_work_sig+0x116/0x1b0 [ 108.722500][ T12] lock_acquire.part.0+0xbc/0x260 [ 108.722502][ T12] ? __timer_delete_sync+0xdb/0x130 [ 108.722504][ T12] ? rcu_is_watching+0x15/0xd0 [ 108.722506][ T12] ? lock_acquire+0x13c/0x160 [ 108.722508][ T12] ? __timer_delete_sync+0xdb/0x130 [ 108.722510][ T12] __timer_delete_sync+0xea/0x130 [ 108.722511][ T12] ? __timer_delete_sync+0xdb/0x130 [ 108.722513][ T12] neigh_flush_one+0x4bf/0x650 [ 108.722515][ T12] __neigh_ifdown.isra.0+0x1b5/0xea0 [ 108.722518][ T12] ? neigh_flush_one+0x650/0x650 [ 108.722519][ T12] ? __lock_release.isra.0+0x6b/0x1a0 [ 108.722521][ T12] ? fib_sync_mtu+0x110/0x110 [ 108.722524][ T12] ? __lock_release.isra.0+0x6b/0x1a0 [ 108.722525][ T12] ? mark_held_locks+0x40/0x70 [ 108.722528][ T12] neigh_ifdown+0x10/0x20 [ 108.722529][ T12] fib_netdev_event+0x1a9/0x5d0 [ 108.722531][ T12] notifier_call_chain+0xae/0x300 [ 108.722534][ T12] netif_close_many+0x366/0x770 [ 108.722536][ T12] ? trace_kfree+0xd2/0x100 [ 108.722539][ T12] ? __dev_close_many+0x680/0x680 [ 108.722544][ T12] ? netif_close_many_and_unlock+0x22/0x2c0 [ 108.722547][ T12] unregister_netdevice_many_notify+0x71a/0x1b40 [ 108.722549][ T12] ? ops_undo_list+0x2ce/0x8f0 [ 108.722550][ T12] ? worker_thread+0x4f1/0xd60 [ 108.722552][ T12] ? kthread+0x367/0x460 [ 108.722553][ T12] ? ret_from_fork+0x4a4/0x720 [ 108.722554][ T12] ? ret_from_fork_asm+0x11/0x20 [ 108.722556][ T12] ? unregister_netdevice_queued+0x80/0x80 [ 108.722559][ T12] default_device_exit_batch+0x38b/0x600 [ 108.722561][ T12] ? generic_xdp_install+0x470/0x470 [ 108.722564][ T12] ? unregister_netdev+0x60/0x60 [ 108.722566][ T12] ? rtnl_is_locked+0x15/0x20 [ 108.722568][ T12] ? nexthop_net_exit_rtnl+0x1f/0x270 [ 108.722572][ T12] ? mutex_is_locked+0x1c/0x50 [ 108.722576][ T12] ops_undo_list+0x2ce/0x8f0 [ 108.722578][ T12] ? lockdep_hardirqs_on+0x8c/0x130 [ 108.722580][ T12] ? rtnl_net_dumpid_one+0x2d0/0x2d0 [ 108.722581][ T12] ? __lock_release.isra.0+0x6b/0x1a0 [ 108.722583][ T12] ? idr_destroy+0x121/0x250 [ 108.722586][ T12] cleanup_net+0x431/0x890 [ 108.722588][ T12] ? net_passive_dec+0x1c0/0x1c0 [ 108.722589][ T12] ? process_one_work+0xdb7/0x1410 [ 108.722591][ T12] ? lock_acquire+0x13c/0x160 [ 108.722592][ T12] ? rcu_is_watching+0x15/0xd0 [ 108.722594][ T12] process_one_work+0xdf8/0x1410 [ 108.722597][ T12] ? pwq_dec_nr_in_flight+0x710/0x710 [ 108.722599][ T12] ? lock_acquire.part.0+0xbc/0x260 [ 108.722601][ T12] worker_thread+0x4f1/0xd60 [ 108.722604][ T12] ? rescuer_thread+0x1320/0x1320 [ 108.722606][ T12] kthread+0x367/0x460 [ 108.722607][ T12] ? trace_irq_enable.constprop.0+0x9b/0x160 [ 108.722610][ T12] ? kthread_affine_node+0x330/0x330 [ 108.722612][ T12] ret_from_fork+0x4a4/0x720 [ 108.722613][ T12] ? arch_exit_to_user_mode_prepare.isra.0+0x120/0x120 [ 108.722615][ T12] ? __switch_to+0x5a3/0xe00 [ 108.722617][ T12] ? kthread_affine_node+0x330/0x330 [ 108.722618][ T12] ret_from_fork_asm+0x11/0x20 [ 108.722621][ T12] [ 108.731108][ T12] br0: port 1(veth0) entered disabled state [ 108.733236][ T12] veth0 (unregistering): left allmulticast mode [ 108.733382][ T12] veth0 (unregistering): left promiscuous mode [ 108.733604][ T12] br0: port 1(veth0) entered disabled state [ 108.815996][ T12] br0: port 2(veth1) entered disabled state [ 108.817346][ T12] veth1 (unregistering): left allmulticast mode [ 108.817514][ T12] veth1 (unregistering): left promiscuous mode [ 108.817705][ T12] br0: port 2(veth1) entered disabled state