[ 18.470820][ T795] modprobe (795) used greatest stack depth: 23888 bytes left [ 23.422740][ T870] gre: GRE over IPv4 demultiplexor driver [ 23.468883][ T870] ip6_gre: GRE over IPv6 tunneling driver [ 24.966137][ T892] 8021q: 802.1Q VLAN Support v1.8 [ 27.781293][ T930] GACT probability NOT on [ 27.810054][ T928] tc (928) used greatest stack depth: 23696 bytes left [ 180.412618][ T1142] [ 180.412773][ T1142] ============================================ [ 180.413037][ T1142] WARNING: possible recursive locking detected [ 180.413326][ T1142] 6.13.0-rc5-virtme #1 Not tainted [ 180.413557][ T1142] -------------------------------------------- [ 180.413833][ T1142] ip/1142 is trying to acquire lock: [ 180.414070][ T1142] ffffffffbbfd6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90 [ 180.414545][ T1142] [ 180.414545][ T1142] but task is already holding lock: [ 180.414876][ T1142] ffffffffbbfd6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90 [ 180.415331][ T1142] [ 180.415331][ T1142] other info that might help us debug this: [ 180.415676][ T1142] Possible unsafe locking scenario: [ 180.415676][ T1142] [ 180.416014][ T1142] CPU0 [ 180.416183][ T1142] ---- [ 180.416364][ T1142] lock((netdev_chain).rwsem); [ 180.416600][ T1142] lock((netdev_chain).rwsem); [ 180.416831][ T1142] [ 180.416831][ T1142] *** DEADLOCK *** [ 180.416831][ T1142] [ 180.417164][ T1142] May be due to missing lock nesting notation [ 180.417164][ T1142] [ 180.417505][ T1142] 2 locks held by ip/1142: [ 180.417742][ T1142] #0: ffffffffbbfe7a48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink+0x228/0xa40 [ 180.418166][ T1142] #1: ffffffffbbfd6630 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90 [ 180.418635][ T1142] [ 180.418635][ T1142] stack backtrace: [ 180.418928][ T1142] CPU: 3 UID: 0 PID: 1142 Comm: ip Not tainted 6.13.0-rc5-virtme #1 [ 180.419286][ T1142] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 180.419574][ T1142] Call Trace: [ 180.419779][ T1142] [ 180.419902][ T1142] dump_stack_lvl+0x82/0xd0 [ 180.420140][ T1142] print_deadlock_bug+0x40a/0x650 [ 180.420373][ T1142] validate_chain+0x5bf/0xae0 [ 180.420605][ T1142] ? __pfx_validate_chain+0x10/0x10 [ 180.420839][ T1142] ? hlock_class+0x4e/0x130 [ 180.421068][ T1142] ? mark_lock+0x38/0x3e0 [ 180.421244][ T1142] __lock_acquire+0xb9a/0x1680 [ 180.421484][ T1142] lock_acquire.part.0+0xeb/0x330 [ 180.421715][ T1142] ? blocking_notifier_call_chain+0x50/0x90 [ 180.422004][ T1142] ? netconsole_process_cleanups_core+0x2e/0x3d0 [ 180.422291][ T1142] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 180.422519][ T1142] ? trace_lock_acquire+0x14c/0x1f0 [ 180.422749][ T1142] ? lock_acquire+0x32/0xc0 [ 180.422975][ T1142] ? blocking_notifier_call_chain+0x50/0x90 [ 180.423268][ T1142] down_read+0x9f/0x340 [ 180.423442][ T1142] ? blocking_notifier_call_chain+0x50/0x90 [ 180.423730][ T1142] ? __pfx_down_read+0x10/0x10 [ 180.423967][ T1142] ? __lock_release+0x103/0x460 [ 180.424199][ T1142] ? netconsole_netdev_event+0x2c1/0x620 [ 180.424427][ T1142] ? __pfx___lock_release+0x10/0x10 [ 180.424657][ T1142] blocking_notifier_call_chain+0x50/0x90 [ 180.424892][ T1142] __netdev_upper_dev_unlink+0xd9/0x220 [ 180.425126][ T1142] ? __pfx___netdev_upper_dev_unlink+0x10/0x10 [ 180.425415][ T1142] ? __mutex_unlock_slowpath+0x14a/0x3d0 [ 180.425644][ T1142] ? __pfx___mutex_unlock_slowpath+0x10/0x10 [ 180.425928][ T1142] ? rtnl_is_locked+0x15/0x20 [ 180.426161][ T1142] netdev_upper_dev_unlink+0x71/0xa0 [ 180.426387][ T1142] ? __pfx_netdev_upper_dev_unlink+0x10/0x10 [ 180.426684][ T1142] ? netconsole_netdev_event+0x2c1/0x620 [ 180.426912][ T1142] ? mutex_is_locked+0x1c/0x60 [ 180.427148][ T1142] ? rtnl_is_locked+0x15/0x20 [ 180.427377][ T1142] ? netdev_master_upper_dev_get+0x13/0x120 [ 180.427660][ T1142] vrf_device_event+0x78/0xe0 [vrf] [ 180.427894][ T1142] notifier_call_chain+0xcd/0x150 [ 180.428125][ T1142] blocking_notifier_call_chain+0x66/0x90 [ 180.428363][ T1142] unregister_netdevice_many_notify+0xa7b/0x1580 [ 180.428648][ T1142] ? hlock_class+0x4e/0x130 [ 180.428874][ T1142] ? mark_lock+0x38/0x3e0 [ 180.429050][ T1142] ? __pfx_unregister_netdevice_many_notify+0x10/0x10 [ 180.429331][ T1142] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 180.429616][ T1142] ? kfree+0xf3/0x330 [ 180.429795][ T1142] ? vlan_vid_del+0x310/0x5e0 [ 180.430031][ T1142] ? vlan_vid_del+0x310/0x5e0 [ 180.430261][ T1142] rtnl_dellink+0x348/0xa40 [ 180.430494][ T1142] ? __pfx_rtnl_dellink+0x10/0x10 [ 180.430750][ T1142] ? find_held_lock+0x2c/0x110 [ 180.430979][ T1142] ? __lock_release+0x103/0x460 [ 180.431204][ T1142] ? rtnetlink_rcv_msg+0x6ef/0xc10 [ 180.431432][ T1142] ? __pfx___lock_release+0x10/0x10 [ 180.431668][ T1142] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 180.431900][ T1142] ? rtnetlink_rcv_msg+0x6ef/0xc10 [ 180.432127][ T1142] ? __pfx_rtnl_dellink+0x10/0x10 [ 180.432360][ T1142] rtnetlink_rcv_msg+0x712/0xc10 [ 180.432589][ T1142] ? __pfx_rtnetlink_rcv_msg+0x10/0x10 [ 180.432815][ T1142] ? hlock_class+0x4e/0x130 [ 180.433040][ T1142] ? mark_lock+0x38/0x3e0 [ 180.433223][ T1142] ? __lock_acquire+0xb9a/0x1680 [ 180.433452][ T1142] netlink_rcv_skb+0x130/0x360 [ 180.433679][ T1142] ? __pfx_rtnetlink_rcv_msg+0x10/0x10 [ 180.433931][ T1142] ? __pfx_netlink_rcv_skb+0x10/0x10 [ 180.434169][ T1142] ? netlink_deliver_tap+0x13e/0x340 [ 180.434397][ T1142] ? netlink_deliver_tap+0xc3/0x340 [ 180.434624][ T1142] netlink_unicast+0x44b/0x710 [ 180.434861][ T1142] ? __pfx_netlink_unicast+0x10/0x10 [ 180.435089][ T1142] ? find_held_lock+0x2c/0x110 [ 180.435318][ T1142] netlink_sendmsg+0x723/0xbe0 [ 180.435545][ T1142] ? __pfx_netlink_sendmsg+0x10/0x10 [ 180.435777][ T1142] ____sys_sendmsg+0x7ac/0xa10 [ 180.436004][ T1142] ? __pfx_____sys_sendmsg+0x10/0x10 [ 180.436230][ T1142] ? __pfx_copy_msghdr_from_user+0x10/0x10 [ 180.436529][ T1142] ___sys_sendmsg+0xee/0x170 [ 180.436757][ T1142] ? __pfx____sys_sendmsg+0x10/0x10 [ 180.436985][ T1142] ? kasan_save_stack+0x34/0x50 [ 180.437214][ T1142] ? kasan_save_stack+0x24/0x50 [ 180.437439][ T1142] ? __kasan_record_aux_stack+0x8e/0xa0 [ 180.437667][ T1142] ? __call_rcu_common.constprop.0+0xa1/0x4b0 [ 180.437949][ T1142] ? __x64_sys_close+0x7c/0xd0 [ 180.438176][ T1142] ? do_syscall_64+0xc1/0x1d0 [ 180.438416][ T1142] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 180.438699][ T1142] ? __lock_acquire+0xb9a/0x1680 [ 180.438931][ T1142] ? find_held_lock+0x2c/0x110 [ 180.439160][ T1142] ? __lock_release+0x103/0x460 [ 180.439384][ T1142] ? __virt_addr_valid+0x22b/0x430 [ 180.439616][ T1142] ? __pfx___lock_release+0x10/0x10 [ 180.439842][ T1142] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 180.440079][ T1142] __sys_sendmsg+0x109/0x1a0 [ 180.440305][ T1142] ? __pfx___sys_sendmsg+0x10/0x10 [ 180.440534][ T1142] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 180.440828][ T1142] do_syscall_64+0xc1/0x1d0 [ 180.441054][ T1142] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 180.441336][ T1142] RIP: 0033:0x7ff68d7149a7 [ 180.441577][ T1142] 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 [ 180.442378][ T1142] RSP: 002b:00007fff747e26a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 180.442727][ T1142] RAX: ffffffffffffffda RBX: 00007fff747e2dd0 RCX: 00007ff68d7149a7 [ 180.443065][ T1142] RDX: 0000000000000000 RSI: 00007fff747e2710 RDI: 0000000000000005 [ 180.443414][ T1142] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078 [ 180.443753][ T1142] R10: 00007ff68d5d2ef8 R11: 0000000000000246 R12: 0000000000000002 [ 180.444108][ T1142] R13: 000000006779021c R14: 0000000000498600 R15: 0000000000000000 [ 180.444454][ T1142]