[ 11.707658][ T261] ip (261) used greatest stack depth: 23072 bytes left [ 16.606866][ T336] 8021q: 802.1Q VLAN Support v1.8 [ 16.989715][ T341] gre: GRE over IPv4 demultiplexor driver [ 17.053617][ T341] ip6_gre: GRE over IPv6 tunneling driver [ 26.728978][ T418] GACT probability NOT on [ 45.103336][ T635] [ 45.103543][ T635] ============================================ [ 45.103760][ T635] WARNING: possible recursive locking detected [ 45.103961][ T635] 6.13.0-rc5-virtme #1 Not tainted [ 45.104127][ T635] -------------------------------------------- [ 45.104341][ T635] ip/635 is trying to acquire lock: [ 45.104505][ T635] ffffffffabfd6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90 [ 45.104851][ T635] [ 45.104851][ T635] but task is already holding lock: [ 45.105091][ T635] ffffffffabfd6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90 [ 45.105416][ T635] [ 45.105416][ T635] other info that might help us debug this: [ 45.105664][ T635] Possible unsafe locking scenario: [ 45.105664][ T635] [ 45.105900][ T635] CPU0 [ 45.106020][ T635] ---- [ 45.106145][ T635] lock((netdev_chain).rwsem); [ 45.106314][ T635] lock((netdev_chain).rwsem); [ 45.106474][ T635] [ 45.106474][ T635] *** DEADLOCK *** [ 45.106474][ T635] [ 45.106721][ T635] May be due to missing lock nesting notation [ 45.106721][ T635] [ 45.106957][ T635] 2 locks held by ip/635: [ 45.107083][ T635] #0: ffffffffabfe7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink+0x228/0xa40 [ 45.107379][ T635] #1: ffffffffabfd6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90 [ 45.107693][ T635] [ 45.107693][ T635] stack backtrace: [ 45.107885][ T635] CPU: 2 UID: 0 PID: 635 Comm: ip Not tainted 6.13.0-rc5-virtme #1 [ 45.108117][ T635] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 45.108313][ T635] Call Trace: [ 45.108441][ T635] [ 45.108527][ T635] dump_stack_lvl+0x82/0xd0 [ 45.108689][ T635] print_deadlock_bug+0x40a/0x650 [ 45.108861][ T635] validate_chain+0x5bf/0xae0 [ 45.109019][ T635] ? __pfx_validate_chain+0x10/0x10 [ 45.109178][ T635] ? hlock_class+0x4e/0x130 [ 45.109332][ T635] ? mark_lock+0x38/0x3e0 [ 45.109446][ T635] __lock_acquire+0xb9a/0x1680 [ 45.109629][ T635] lock_acquire.part.0+0xeb/0x330 [ 45.109790][ T635] ? blocking_notifier_call_chain+0x50/0x90 [ 45.109994][ T635] ? netconsole_process_cleanups_core+0x2e/0x3d0 [ 45.110206][ T635] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 45.110357][ T635] ? trace_lock_acquire+0x14c/0x1f0 [ 45.110511][ T635] ? lock_acquire+0x32/0xc0 [ 45.110670][ T635] ? blocking_notifier_call_chain+0x50/0x90 [ 45.110860][ T635] down_read+0x9f/0x340 [ 45.110981][ T635] ? blocking_notifier_call_chain+0x50/0x90 [ 45.111163][ T635] ? __pfx_down_read+0x10/0x10 [ 45.111318][ T635] ? __lock_release+0x103/0x460 [ 45.111466][ T635] ? netconsole_netdev_event+0x2c1/0x620 [ 45.111620][ T635] ? __pfx___lock_release+0x10/0x10 [ 45.111768][ T635] blocking_notifier_call_chain+0x50/0x90 [ 45.111930][ T635] __netdev_upper_dev_unlink+0xd9/0x220 [ 45.112090][ T635] ? __pfx___netdev_upper_dev_unlink+0x10/0x10 [ 45.112273][ T635] ? __mutex_unlock_slowpath+0x14a/0x3d0 [ 45.112428][ T635] ? __pfx___mutex_unlock_slowpath+0x10/0x10 [ 45.112611][ T635] ? rtnl_is_locked+0x15/0x20 [ 45.112773][ T635] netdev_upper_dev_unlink+0x71/0xa0 [ 45.112923][ T635] ? __pfx_netdev_upper_dev_unlink+0x10/0x10 [ 45.113111][ T635] ? netconsole_netdev_event+0x2c1/0x620 [ 45.113267][ T635] ? mutex_is_locked+0x1c/0x60 [ 45.113415][ T635] ? rtnl_is_locked+0x15/0x20 [ 45.113568][ T635] ? netdev_master_upper_dev_get+0x13/0x120 [ 45.113755][ T635] vrf_device_event+0x78/0xe0 [vrf] [ 45.113917][ T635] notifier_call_chain+0xcd/0x150 [ 45.114076][ T635] blocking_notifier_call_chain+0x66/0x90 [ 45.114233][ T635] unregister_netdevice_many_notify+0xa7b/0x1580 [ 45.114426][ T635] ? __lock_release+0x103/0x460 [ 45.114572][ T635] ? __pfx___lock_release+0x10/0x10 [ 45.114736][ T635] ? __pfx_unregister_netdevice_many_notify+0x10/0x10 [ 45.114937][ T635] ? hlock_class+0x4e/0x130 [ 45.115102][ T635] ? mark_held_locks+0x9e/0xe0 [ 45.115264][ T635] ? __pfx_vlan_info_rcu_free+0x10/0x10 [ 45.115424][ T635] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 45.115609][ T635] rtnl_dellink+0x348/0xa40 [ 45.115765][ T635] ? __pfx_rtnl_dellink+0x10/0x10 [ 45.115923][ T635] ? find_held_lock+0x2c/0x110 [ 45.116070][ T635] ? __lock_release+0x103/0x460 [ 45.116218][ T635] ? rtnetlink_rcv_msg+0x6ef/0xc10 [ 45.116366][ T635] ? __pfx___lock_release+0x10/0x10 [ 45.116511][ T635] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 45.116659][ T635] ? rtnetlink_rcv_msg+0x6ef/0xc10 [ 45.116807][ T635] ? __pfx_rtnl_dellink+0x10/0x10 [ 45.116966][ T635] rtnetlink_rcv_msg+0x712/0xc10 [ 45.117121][ T635] ? __pfx_rtnetlink_rcv_msg+0x10/0x10 [ 45.117273][ T635] ? hlock_class+0x4e/0x130 [ 45.117427][ T635] ? mark_lock+0x38/0x3e0 [ 45.117538][ T635] ? __lock_acquire+0xb9a/0x1680 [ 45.117701][ T635] netlink_rcv_skb+0x130/0x360 [ 45.117857][ T635] ? __pfx_rtnetlink_rcv_msg+0x10/0x10 [ 45.118022][ T635] ? __pfx_netlink_rcv_skb+0x10/0x10 [ 45.118182][ T635] ? netlink_deliver_tap+0x13e/0x340 [ 45.118332][ T635] ? netlink_deliver_tap+0xc3/0x340 [ 45.118495][ T635] netlink_unicast+0x44b/0x710 [ 45.118652][ T635] ? __pfx_netlink_unicast+0x10/0x10 [ 45.118799][ T635] ? find_held_lock+0x2c/0x110 [ 45.118959][ T635] netlink_sendmsg+0x723/0xbe0 [ 45.119115][ T635] ? __pfx_netlink_sendmsg+0x10/0x10 [ 45.119280][ T635] ____sys_sendmsg+0x7ac/0xa10 [ 45.119430][ T635] ? __pfx_____sys_sendmsg+0x10/0x10 [ 45.119605][ T635] ? __pfx_copy_msghdr_from_user+0x10/0x10 [ 45.119810][ T635] ___sys_sendmsg+0xee/0x170 [ 45.119967][ T635] ? __pfx____sys_sendmsg+0x10/0x10 [ 45.120122][ T635] ? kasan_save_stack+0x34/0x50 [ 45.120273][ T635] ? kasan_save_stack+0x24/0x50 [ 45.120427][ T635] ? __kasan_record_aux_stack+0x8e/0xa0 [ 45.120574][ T635] ? __call_rcu_common.constprop.0+0xa1/0x4b0 [ 45.120763][ T635] ? __x64_sys_close+0x7c/0xd0 [ 45.120917][ T635] ? do_syscall_64+0xc1/0x1d0 [ 45.121065][ T635] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 45.121251][ T635] ? __lock_acquire+0xb9a/0x1680 [ 45.121398][ T635] ? find_held_lock+0x2c/0x110 [ 45.121547][ T635] ? __lock_release+0x103/0x460 [ 45.121698][ T635] ? __virt_addr_valid+0x22b/0x430 [ 45.121859][ T635] ? __pfx___lock_release+0x10/0x10 [ 45.122021][ T635] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 45.122168][ T635] __sys_sendmsg+0x109/0x1a0 [ 45.122327][ T635] ? __pfx___sys_sendmsg+0x10/0x10 [ 45.122485][ T635] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 45.122672][ T635] do_syscall_64+0xc1/0x1d0 [ 45.122830][ T635] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 45.123016][ T635] RIP: 0033:0x7f38646ea9a7 [ 45.123193][ T635] Code: 0a 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b9 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10 [ 45.123725][ T635] RSP: 002b:00007ffcb547e3c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 45.123947][ T635] RAX: ffffffffffffffda RBX: 00007ffcb547eaf0 RCX: 00007f38646ea9a7 [ 45.124180][ T635] RDX: 0000000000000000 RSI: 00007ffcb547e430 RDI: 0000000000000005 [ 45.124415][ T635] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 45.124641][ T635] R10: 00007f38645a8ef8 R11: 0000000000000246 R12: 0000000000000002 [ 45.124866][ T635] R13: 0000000067795419 R14: 0000000000498600 R15: 0000000000000000 [ 45.125097][ T635]