[ 11.160035][ T250] ip (250) used greatest stack depth: 23312 bytes left [ 12.986811][ T286] 8021q: 802.1Q VLAN Support v1.8 [ 24.860656][ T376] [ 24.860848][ T376] ============================================ [ 24.861054][ T376] WARNING: possible recursive locking detected [ 24.861251][ T376] 6.13.0-rc5-virtme #1 Not tainted [ 24.861414][ T376] -------------------------------------------- [ 24.861610][ T376] ip/376 is trying to acquire lock: [ 24.861767][ T376] ffffffff8f1d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90 [ 24.862098][ T376] [ 24.862098][ T376] but task is already holding lock: [ 24.862333][ T376] ffffffff8f1d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90 [ 24.862653][ T376] [ 24.862653][ T376] other info that might help us debug this: [ 24.862889][ T376] Possible unsafe locking scenario: [ 24.862889][ T376] [ 24.863121][ T376] CPU0 [ 24.863242][ T376] ---- [ 24.863362][ T376] lock((netdev_chain).rwsem); [ 24.863523][ T376] lock((netdev_chain).rwsem); [ 24.863682][ T376] [ 24.863682][ T376] *** DEADLOCK *** [ 24.863682][ T376] [ 24.863933][ T376] May be due to missing lock nesting notation [ 24.863933][ T376] [ 24.864172][ T376] 2 locks held by ip/376: [ 24.864295][ T376] #0: ffffffff8f1e7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink+0x228/0xa40 [ 24.864590][ T376] #1: ffffffff8f1d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90 [ 24.864919][ T376] [ 24.864919][ T376] stack backtrace: [ 24.865115][ T376] CPU: 2 UID: 0 PID: 376 Comm: ip Not tainted 6.13.0-rc5-virtme #1 [ 24.865353][ T376] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 24.865555][ T376] Call Trace: [ 24.865683][ T376] [ 24.865769][ T376] dump_stack_lvl+0x82/0xd0 [ 24.865938][ T376] print_deadlock_bug+0x40a/0x650 [ 24.866101][ T376] validate_chain+0x5bf/0xae0 [ 24.866265][ T376] ? __pfx_validate_chain+0x10/0x10 [ 24.866434][ T376] ? hlock_class+0x4e/0x130 [ 24.866592][ T376] ? mark_lock+0x38/0x3e0 [ 24.866719][ T376] __lock_acquire+0xb9a/0x1680 [ 24.866879][ T376] lock_acquire.part.0+0xeb/0x330 [ 24.867037][ T376] ? blocking_notifier_call_chain+0x50/0x90 [ 24.867234][ T376] ? netconsole_process_cleanups_core+0x2e/0x3d0 [ 24.867440][ T376] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 24.867604][ T376] ? trace_lock_acquire+0x14c/0x1f0 [ 24.867764][ T376] ? lock_acquire+0x32/0xc0 [ 24.867931][ T376] ? blocking_notifier_call_chain+0x50/0x90 [ 24.868130][ T376] down_read+0x9f/0x340 [ 24.868254][ T376] ? blocking_notifier_call_chain+0x50/0x90 [ 24.868449][ T376] ? __pfx_down_read+0x10/0x10 [ 24.868611][ T376] ? __lock_release+0x103/0x460 [ 24.868772][ T376] ? netconsole_netdev_event+0x2c1/0x620 [ 24.868947][ T376] ? __pfx___lock_release+0x10/0x10 [ 24.869115][ T376] blocking_notifier_call_chain+0x50/0x90 [ 24.869284][ T376] __netdev_upper_dev_unlink+0xd9/0x220 [ 24.869445][ T376] ? __pfx___netdev_upper_dev_unlink+0x10/0x10 [ 24.869642][ T376] ? __mutex_unlock_slowpath+0x14a/0x3d0 [ 24.869806][ T376] ? __pfx___mutex_unlock_slowpath+0x10/0x10 [ 24.870006][ T376] ? rtnl_is_locked+0x15/0x20 [ 24.870174][ T376] netdev_upper_dev_unlink+0x71/0xa0 [ 24.870335][ T376] ? __pfx_netdev_upper_dev_unlink+0x10/0x10 [ 24.870534][ T376] ? netconsole_netdev_event+0x2c1/0x620 [ 24.870695][ T376] ? mutex_is_locked+0x1c/0x60 [ 24.870853][ T376] ? rtnl_is_locked+0x15/0x20 [ 24.871014][ T376] ? netdev_master_upper_dev_get+0x13/0x120 [ 24.871212][ T376] vrf_device_event+0x78/0xe0 [vrf] [ 24.871380][ T376] notifier_call_chain+0xcd/0x150 [ 24.871540][ T376] blocking_notifier_call_chain+0x66/0x90 [ 24.871700][ T376] unregister_netdevice_many_notify+0xa7b/0x1580 [ 24.871900][ T376] ? __lock_release+0x103/0x460 [ 24.872059][ T376] ? __pfx___lock_release+0x10/0x10 [ 24.872220][ T376] ? __pfx_unregister_netdevice_many_notify+0x10/0x10 [ 24.872423][ T376] ? hlock_class+0x4e/0x130 [ 24.872585][ T376] ? mark_held_locks+0x9e/0xe0 [ 24.872742][ T376] ? __pfx_vlan_info_rcu_free+0x10/0x10 [ 24.872910][ T376] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 24.873112][ T376] rtnl_dellink+0x348/0xa40 [ 24.873273][ T376] ? __pfx_rtnl_dellink+0x10/0x10 [ 24.873447][ T376] ? find_held_lock+0x2c/0x110 [ 24.873607][ T376] ? __lock_release+0x103/0x460 [ 24.873780][ T376] ? rtnetlink_rcv_msg+0x6ef/0xc10 [ 24.873939][ T376] ? __pfx___lock_release+0x10/0x10 [ 24.874099][ T376] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 24.874261][ T376] ? rtnetlink_rcv_msg+0x6ef/0xc10 [ 24.874422][ T376] ? __pfx_rtnl_dellink+0x10/0x10 [ 24.874581][ T376] rtnetlink_rcv_msg+0x712/0xc10 [ 24.874752][ T376] ? __pfx_rtnetlink_rcv_msg+0x10/0x10 [ 24.874934][ T376] ? hlock_class+0x4e/0x130 [ 24.875095][ T376] ? mark_lock+0x38/0x3e0 [ 24.875216][ T376] ? __lock_acquire+0xb9a/0x1680 [ 24.875376][ T376] netlink_rcv_skb+0x130/0x360 [ 24.875536][ T376] ? __pfx_rtnetlink_rcv_msg+0x10/0x10 [ 24.875705][ T376] ? __pfx_netlink_rcv_skb+0x10/0x10 [ 24.875871][ T376] ? netlink_deliver_tap+0x13e/0x340 [ 24.876035][ T376] ? netlink_deliver_tap+0xc3/0x340 [ 24.876198][ T376] netlink_unicast+0x44b/0x710 [ 24.876357][ T376] ? __pfx_netlink_unicast+0x10/0x10 [ 24.876519][ T376] ? find_held_lock+0x2c/0x110 [ 24.876680][ T376] netlink_sendmsg+0x723/0xbe0 [ 24.876845][ T376] ? __pfx_netlink_sendmsg+0x10/0x10 [ 24.877007][ T376] ____sys_sendmsg+0x7ac/0xa10 [ 24.877171][ T376] ? __pfx_____sys_sendmsg+0x10/0x10 [ 24.877329][ T376] ? __pfx_copy_msghdr_from_user+0x10/0x10 [ 24.877531][ T376] ___sys_sendmsg+0xee/0x170 [ 24.877693][ T376] ? __pfx____sys_sendmsg+0x10/0x10 [ 24.877854][ T376] ? kasan_save_stack+0x34/0x50 [ 24.878016][ T376] ? kasan_save_stack+0x24/0x50 [ 24.878173][ T376] ? __kasan_record_aux_stack+0x8e/0xa0 [ 24.878354][ T376] ? __call_rcu_common.constprop.0+0xa1/0x4b0 [ 24.878558][ T376] ? __x64_sys_close+0x7c/0xd0 [ 24.878718][ T376] ? do_syscall_64+0xc1/0x1d0 [ 24.878880][ T376] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 24.879083][ T376] ? __lock_acquire+0xb9a/0x1680 [ 24.879244][ T376] ? find_held_lock+0x2c/0x110 [ 24.879406][ T376] ? __lock_release+0x103/0x460 [ 24.879566][ T376] ? __virt_addr_valid+0x22b/0x430 [ 24.879732][ T376] ? __pfx___lock_release+0x10/0x10 [ 24.879892][ T376] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 24.880054][ T376] __sys_sendmsg+0x109/0x1a0 [ 24.880213][ T376] ? __pfx___sys_sendmsg+0x10/0x10 [ 24.880377][ T376] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 24.880579][ T376] do_syscall_64+0xc1/0x1d0 [ 24.880744][ T376] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 24.880953][ T376] RIP: 0033:0x7f4e754d69a7 [ 24.881144][ T376] 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 [ 24.881706][ T376] RSP: 002b:00007ffdc7bfdc18 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 24.881953][ T376] RAX: ffffffffffffffda RBX: 00007ffdc7bfe340 RCX: 00007f4e754d69a7 [ 24.882195][ T376] RDX: 0000000000000000 RSI: 00007ffdc7bfdc80 RDI: 0000000000000005 [ 24.882442][ T376] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 24.882683][ T376] R10: 00007f4e75394ef8 R11: 0000000000000246 R12: 0000000000000002 [ 24.882929][ T376] R13: 0000000067792faa R14: 0000000000498600 R15: 0000000000000000 [ 24.883175][ T376]