[ 10.865856][ T248] ip (248) used greatest stack depth: 23664 bytes left [ 16.436409][ T326] gre: GRE over IPv4 demultiplexor driver [ 16.482943][ T326] ip6_gre: GRE over IPv6 tunneling driver [ 18.257710][ T348] 8021q: 802.1Q VLAN Support v1.8 [ 21.543032][ T386] GACT probability NOT on [ 439.944289][ C2] hrtimer: interrupt took 2626527 ns [ 1330.003619][T17284] ip (17284) used greatest stack depth: 23640 bytes left [ 1332.407922][T17312] [ 1332.408091][T17312] ============================================ [ 1332.408305][T17312] WARNING: possible recursive locking detected [ 1332.408504][T17312] 6.13.0-rc5-virtme #1 Not tainted [ 1332.408663][T17312] -------------------------------------------- [ 1332.408865][T17312] ip/17312 is trying to acquire lock: [ 1332.409031][T17312] ffffffff8b7d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90 [ 1332.409366][T17312] [ 1332.409366][T17312] but task is already holding lock: [ 1332.409604][T17312] ffffffff8b7d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90 [ 1332.409919][T17312] [ 1332.409919][T17312] other info that might help us debug this: [ 1332.410142][T17312] Possible unsafe locking scenario: [ 1332.410142][T17312] [ 1332.410385][T17312] CPU0 [ 1332.410507][T17312] ---- [ 1332.410632][T17312] lock((netdev_chain).rwsem); [ 1332.410809][T17312] lock((netdev_chain).rwsem); [ 1332.410997][T17312] [ 1332.410997][T17312] *** DEADLOCK *** [ 1332.410997][T17312] [ 1332.411242][T17312] May be due to missing lock nesting notation [ 1332.411242][T17312] [ 1332.411476][T17312] 2 locks held by ip/17312: [ 1332.411636][T17312] #0: ffffffff8b7e7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink+0x228/0xa40 [ 1332.411926][T17312] #1: ffffffff8b7d6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90 [ 1332.412259][T17312] [ 1332.412259][T17312] stack backtrace: [ 1332.412467][T17312] CPU: 3 UID: 0 PID: 17312 Comm: ip Not tainted 6.13.0-rc5-virtme #1 [ 1332.412713][T17312] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 1332.412919][T17312] Call Trace: [ 1332.413043][T17312] [ 1332.413126][T17312] dump_stack_lvl+0x82/0xd0 [ 1332.413295][T17312] print_deadlock_bug+0x40a/0x650 [ 1332.413462][T17312] validate_chain+0x5bf/0xae0 [ 1332.413625][T17312] ? __pfx_validate_chain+0x10/0x10 [ 1332.413788][T17312] ? hlock_class+0x4e/0x130 [ 1332.413951][T17312] ? mark_lock+0x38/0x3e0 [ 1332.414076][T17312] __lock_acquire+0xb9a/0x1680 [ 1332.414239][T17312] lock_acquire.part.0+0xeb/0x330 [ 1332.414400][T17312] ? blocking_notifier_call_chain+0x50/0x90 [ 1332.414601][T17312] ? netconsole_process_cleanups_core+0x2e/0x3d0 [ 1332.414808][T17312] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 1332.414968][T17312] ? trace_lock_acquire+0x14c/0x1f0 [ 1332.415139][T17312] ? lock_acquire+0x32/0xc0 [ 1332.415302][T17312] ? blocking_notifier_call_chain+0x50/0x90 [ 1332.415503][T17312] down_read+0x9f/0x340 [ 1332.415627][T17312] ? blocking_notifier_call_chain+0x50/0x90 [ 1332.415830][T17312] ? __pfx_down_read+0x10/0x10 [ 1332.415994][T17312] ? __lock_release+0x103/0x460 [ 1332.416154][T17312] ? netconsole_netdev_event+0x2c1/0x620 [ 1332.416315][T17312] ? __pfx___lock_release+0x10/0x10 [ 1332.416478][T17312] blocking_notifier_call_chain+0x50/0x90 [ 1332.416640][T17312] __netdev_upper_dev_unlink+0xd9/0x220 [ 1332.416803][T17312] ? __pfx___netdev_upper_dev_unlink+0x10/0x10 [ 1332.417002][T17312] ? __mutex_unlock_slowpath+0x14a/0x3d0 [ 1332.417169][T17312] ? __pfx___mutex_unlock_slowpath+0x10/0x10 [ 1332.417377][T17312] ? rtnl_is_locked+0x15/0x20 [ 1332.417544][T17312] netdev_upper_dev_unlink+0x71/0xa0 [ 1332.417713][T17312] ? __pfx_netdev_upper_dev_unlink+0x10/0x10 [ 1332.417916][T17312] ? netconsole_netdev_event+0x2c1/0x620 [ 1332.418080][T17312] ? mutex_is_locked+0x1c/0x60 [ 1332.418253][T17312] ? rtnl_is_locked+0x15/0x20 [ 1332.418415][T17312] ? netdev_master_upper_dev_get+0x13/0x120 [ 1332.418628][T17312] vrf_device_event+0x78/0xe0 [vrf] [ 1332.418801][T17312] notifier_call_chain+0xcd/0x150 [ 1332.418968][T17312] blocking_notifier_call_chain+0x66/0x90 [ 1332.419133][T17312] unregister_netdevice_many_notify+0xa7b/0x1580 [ 1332.419341][T17312] ? hlock_class+0x4e/0x130 [ 1332.419504][T17312] ? mark_lock+0x38/0x3e0 [ 1332.419630][T17312] ? __pfx_unregister_netdevice_many_notify+0x10/0x10 [ 1332.419828][T17312] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 1332.420033][T17312] ? kfree+0xf3/0x330 [ 1332.420145][T17312] ? vlan_vid_del+0x310/0x5e0 [ 1332.420298][T17312] ? vlan_vid_del+0x310/0x5e0 [ 1332.420445][T17312] rtnl_dellink+0x348/0xa40 [ 1332.420601][T17312] ? __pfx_rtnl_dellink+0x10/0x10 [ 1332.420761][T17312] ? find_held_lock+0x2c/0x110 [ 1332.420908][T17312] ? __lock_release+0x103/0x460 [ 1332.421054][T17312] ? rtnetlink_rcv_msg+0x6ef/0xc10 [ 1332.421201][T17312] ? __pfx___lock_release+0x10/0x10 [ 1332.421347][T17312] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 1332.421494][T17312] ? rtnetlink_rcv_msg+0x6ef/0xc10 [ 1332.421646][T17312] ? __pfx_rtnl_dellink+0x10/0x10 [ 1332.421794][T17312] rtnetlink_rcv_msg+0x712/0xc10 [ 1332.421940][T17312] ? __pfx_rtnetlink_rcv_msg+0x10/0x10 [ 1332.422087][T17312] ? hlock_class+0x4e/0x130 [ 1332.422234][T17312] ? mark_lock+0x38/0x3e0 [ 1332.422348][T17312] ? __lock_acquire+0xb9a/0x1680 [ 1332.422506][T17312] netlink_rcv_skb+0x130/0x360 [ 1332.422653][T17312] ? __pfx_rtnetlink_rcv_msg+0x10/0x10 [ 1332.422809][T17312] ? __pfx_netlink_rcv_skb+0x10/0x10 [ 1332.422961][T17312] ? netlink_deliver_tap+0x13e/0x340 [ 1332.423123][T17312] ? netlink_deliver_tap+0xc3/0x340 [ 1332.423285][T17312] netlink_unicast+0x44b/0x710 [ 1332.423448][T17312] ? __pfx_netlink_unicast+0x10/0x10 [ 1332.423611][T17312] ? find_held_lock+0x2c/0x110 [ 1332.423773][T17312] netlink_sendmsg+0x723/0xbe0 [ 1332.423942][T17312] ? __pfx_netlink_sendmsg+0x10/0x10 [ 1332.424105][T17312] ____sys_sendmsg+0x7ac/0xa10 [ 1332.424267][T17312] ? __pfx_____sys_sendmsg+0x10/0x10 [ 1332.424427][T17312] ? __pfx_copy_msghdr_from_user+0x10/0x10 [ 1332.424629][T17312] ___sys_sendmsg+0xee/0x170 [ 1332.424779][T17312] ? __pfx____sys_sendmsg+0x10/0x10 [ 1332.424928][T17312] ? kasan_save_stack+0x34/0x50 [ 1332.425091][T17312] ? kasan_save_stack+0x24/0x50 [ 1332.425240][T17312] ? __kasan_record_aux_stack+0x8e/0xa0 [ 1332.425390][T17312] ? __call_rcu_common.constprop.0+0xa1/0x4b0 [ 1332.425574][T17312] ? __x64_sys_close+0x7c/0xd0 [ 1332.425723][T17312] ? do_syscall_64+0xc1/0x1d0 [ 1332.425877][T17312] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 1332.426067][T17312] ? __lock_acquire+0xb9a/0x1680 [ 1332.426225][T17312] ? find_held_lock+0x2c/0x110 [ 1332.426371][T17312] ? __lock_release+0x103/0x460 [ 1332.426517][T17312] ? __virt_addr_valid+0x22b/0x430 [ 1332.426668][T17312] ? __pfx___lock_release+0x10/0x10 [ 1332.426813][T17312] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 1332.426961][T17312] __sys_sendmsg+0x109/0x1a0 [ 1332.427127][T17312] ? __pfx___sys_sendmsg+0x10/0x10 [ 1332.427297][T17312] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 1332.427502][T17312] do_syscall_64+0xc1/0x1d0 [ 1332.427662][T17312] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 1332.427861][T17312] RIP: 0033:0x7f20e5e1b9a7 [ 1332.428031][T17312] 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 [ 1332.428605][T17312] RSP: 002b:00007fff3cb1a4e8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 1332.428829][T17312] RAX: ffffffffffffffda RBX: 00007fff3cb1ac10 RCX: 00007f20e5e1b9a7 [ 1332.429053][T17312] RDX: 0000000000000000 RSI: 00007fff3cb1a550 RDI: 0000000000000005 [ 1332.429273][T17312] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 1332.429502][T17312] R10: 00007f20e5cd9ef8 R11: 0000000000000246 R12: 0000000000000002 [ 1332.429721][T17312] R13: 0000000067792afc R14: 0000000000498600 R15: 0000000000000000 [ 1332.429942][T17312]