[ 11.135031][ T249] ip (249) used greatest stack depth: 24432 bytes left [ 16.372896][ T333] 8021q: 802.1Q VLAN Support v1.8 [ 16.843762][ T339] gre: GRE over IPv4 demultiplexor driver [ 16.863761][ T339] ip_gre: GRE over IPv4 tunneling driver [ 17.165599][ T345] ip (345) used greatest stack depth: 23376 bytes left [ 30.098513][ T441] [ 30.098712][ T441] ============================================ [ 30.098934][ T441] WARNING: possible recursive locking detected [ 30.099138][ T441] 6.13.0-rc5-virtme #1 Not tainted [ 30.099306][ T441] -------------------------------------------- [ 30.099511][ T441] ip/441 is trying to acquire lock: [ 30.099678][ T441] ffffffffb45d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90 [ 30.100033][ T441] [ 30.100033][ T441] but task is already holding lock: [ 30.100277][ T441] ffffffffb45d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90 [ 30.100612][ T441] [ 30.100612][ T441] other info that might help us debug this: [ 30.100862][ T441] Possible unsafe locking scenario: [ 30.100862][ T441] [ 30.101105][ T441] CPU0 [ 30.101231][ T441] ---- [ 30.101353][ T441] lock((netdev_chain).rwsem); [ 30.101526][ T441] lock((netdev_chain).rwsem); [ 30.101694][ T441] [ 30.101694][ T441] *** DEADLOCK *** [ 30.101694][ T441] [ 30.101961][ T441] May be due to missing lock nesting notation [ 30.101961][ T441] [ 30.102207][ T441] 2 locks held by ip/441: [ 30.102341][ T441] #0: ffffffffb45e7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink+0x228/0xa40 [ 30.102644][ T441] #1: ffffffffb45d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90 [ 30.102984][ T441] [ 30.102984][ T441] stack backtrace: [ 30.103192][ T441] CPU: 3 UID: 0 PID: 441 Comm: ip Not tainted 6.13.0-rc5-virtme #1 [ 30.103446][ T441] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 30.103660][ T441] Call Trace: [ 30.103787][ T441] [ 30.103877][ T441] dump_stack_lvl+0x82/0xd0 [ 30.104052][ T441] print_deadlock_bug+0x40a/0x650 [ 30.104216][ T441] validate_chain+0x5bf/0xae0 [ 30.104400][ T441] ? __pfx_validate_chain+0x10/0x10 [ 30.104579][ T441] ? hlock_class+0x4e/0x130 [ 30.104753][ T441] ? mark_lock+0x38/0x3e0 [ 30.104879][ T441] __lock_acquire+0xb9a/0x1680 [ 30.105048][ T441] lock_acquire.part.0+0xeb/0x330 [ 30.105208][ T441] ? blocking_notifier_call_chain+0x50/0x90 [ 30.105430][ T441] ? netconsole_process_cleanups_core+0x2e/0x3d0 [ 30.105644][ T441] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 30.105814][ T441] ? trace_lock_acquire+0x14c/0x1f0 [ 30.105978][ T441] ? lock_acquire+0x32/0xc0 [ 30.106150][ T441] ? blocking_notifier_call_chain+0x50/0x90 [ 30.106352][ T441] down_read+0x9f/0x340 [ 30.106479][ T441] ? blocking_notifier_call_chain+0x50/0x90 [ 30.106677][ T441] ? __pfx_down_read+0x10/0x10 [ 30.106850][ T441] ? __lock_release+0x103/0x460 [ 30.107011][ T441] ? netconsole_netdev_event+0x2c1/0x620 [ 30.107173][ T441] ? __pfx___lock_release+0x10/0x10 [ 30.107337][ T441] blocking_notifier_call_chain+0x50/0x90 [ 30.107500][ T441] __netdev_upper_dev_unlink+0xd9/0x220 [ 30.107665][ T441] ? __pfx___netdev_upper_dev_unlink+0x10/0x10 [ 30.107865][ T441] ? __mutex_unlock_slowpath+0x14a/0x3d0 [ 30.108030][ T441] ? __pfx___mutex_unlock_slowpath+0x10/0x10 [ 30.108231][ T441] ? rtnl_is_locked+0x15/0x20 [ 30.108394][ T441] netdev_upper_dev_unlink+0x71/0xa0 [ 30.108556][ T441] ? __pfx_netdev_upper_dev_unlink+0x10/0x10 [ 30.108776][ T441] ? netconsole_netdev_event+0x2c1/0x620 [ 30.108954][ T441] ? mutex_is_locked+0x1c/0x60 [ 30.109127][ T441] ? rtnl_is_locked+0x15/0x20 [ 30.109292][ T441] ? netdev_master_upper_dev_get+0x13/0x120 [ 30.109510][ T441] vrf_device_event+0x78/0xe0 [vrf] [ 30.109684][ T441] notifier_call_chain+0xcd/0x150 [ 30.109848][ T441] blocking_notifier_call_chain+0x66/0x90 [ 30.110023][ T441] unregister_netdevice_many_notify+0xa7b/0x1580 [ 30.110235][ T441] ? find_held_lock+0x2c/0x110 [ 30.110404][ T441] ? __pfx_unregister_netdevice_many_notify+0x10/0x10 [ 30.110623][ T441] ? __pfx___lock_release+0x10/0x10 [ 30.110795][ T441] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 30.110961][ T441] ? rtnl_is_locked+0x15/0x20 [ 30.111126][ T441] ? unregister_netdevice_queue+0x70/0x410 [ 30.111326][ T441] ? __pfx_unregister_netdevice_queue+0x10/0x10 [ 30.111530][ T441] ? net_generic+0xbb/0x1f0 [ 30.111718][ T441] rtnl_dellink+0x348/0xa40 [ 30.111885][ T441] ? __pfx_rtnl_dellink+0x10/0x10 [ 30.112068][ T441] ? find_held_lock+0x2c/0x110 [ 30.112237][ T441] ? __lock_release+0x103/0x460 [ 30.112404][ T441] ? rtnetlink_rcv_msg+0x6ef/0xc10 [ 30.112571][ T441] ? __pfx___lock_release+0x10/0x10 [ 30.112735][ T441] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 30.112910][ T441] ? rtnetlink_rcv_msg+0x6ef/0xc10 [ 30.113075][ T441] ? __pfx_rtnl_dellink+0x10/0x10 [ 30.113248][ T441] rtnetlink_rcv_msg+0x712/0xc10 [ 30.113411][ T441] ? __pfx_rtnetlink_rcv_msg+0x10/0x10 [ 30.113574][ T441] ? hlock_class+0x4e/0x130 [ 30.113732][ T441] ? mark_lock+0x38/0x3e0 [ 30.113856][ T441] ? __lock_acquire+0xb9a/0x1680 [ 30.114032][ T441] netlink_rcv_skb+0x130/0x360 [ 30.114206][ T441] ? __pfx_rtnetlink_rcv_msg+0x10/0x10 [ 30.114374][ T441] ? __pfx_netlink_rcv_skb+0x10/0x10 [ 30.114546][ T441] ? netlink_deliver_tap+0x13e/0x340 [ 30.114711][ T441] ? netlink_deliver_tap+0xc3/0x340 [ 30.114879][ T441] netlink_unicast+0x44b/0x710 [ 30.115052][ T441] ? __pfx_netlink_unicast+0x10/0x10 [ 30.115216][ T441] ? find_held_lock+0x2c/0x110 [ 30.115388][ T441] netlink_sendmsg+0x723/0xbe0 [ 30.115553][ T441] ? __pfx_netlink_sendmsg+0x10/0x10 [ 30.115720][ T441] ____sys_sendmsg+0x7ac/0xa10 [ 30.115884][ T441] ? __pfx_____sys_sendmsg+0x10/0x10 [ 30.116047][ T441] ? __pfx_copy_msghdr_from_user+0x10/0x10 [ 30.116261][ T441] ___sys_sendmsg+0xee/0x170 [ 30.116428][ T441] ? __pfx____sys_sendmsg+0x10/0x10 [ 30.116600][ T441] ? kasan_save_stack+0x34/0x50 [ 30.116765][ T441] ? kasan_save_stack+0x24/0x50 [ 30.116933][ T441] ? __kasan_record_aux_stack+0x8e/0xa0 [ 30.117107][ T441] ? __call_rcu_common.constprop.0+0xa1/0x4b0 [ 30.117317][ T441] ? __x64_sys_close+0x7c/0xd0 [ 30.117483][ T441] ? do_syscall_64+0xc1/0x1d0 [ 30.117650][ T441] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 30.117857][ T441] ? __lock_acquire+0xb9a/0x1680 [ 30.118024][ T441] ? find_held_lock+0x2c/0x110 [ 30.118194][ T441] ? __lock_release+0x103/0x460 [ 30.118358][ T441] ? __virt_addr_valid+0x22b/0x430 [ 30.118523][ T441] ? __pfx___lock_release+0x10/0x10 [ 30.118687][ T441] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 30.118869][ T441] __sys_sendmsg+0x109/0x1a0 [ 30.119045][ T441] ? __pfx___sys_sendmsg+0x10/0x10 [ 30.119204][ T441] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 30.119415][ T441] do_syscall_64+0xc1/0x1d0 [ 30.119574][ T441] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 30.119777][ T441] RIP: 0033:0x7ffb75e109a7 [ 30.119953][ T441] 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 [ 30.120530][ T441] RSP: 002b:00007fff78cd08c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 30.120790][ T441] RAX: ffffffffffffffda RBX: 00007fff78cd0ff0 RCX: 00007ffb75e109a7 [ 30.121039][ T441] RDX: 0000000000000000 RSI: 00007fff78cd0930 RDI: 0000000000000005 [ 30.121295][ T441] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 30.121544][ T441] R10: 00007ffb75cceef8 R11: 0000000000000246 R12: 0000000000000002 [ 30.121792][ T441] R13: 00000000677957e0 R14: 0000000000498600 R15: 0000000000000000 [ 30.122069][ T441]