======================================
| [  184.224193][ T1370] br0: port 1(eth0) entered forwarding state
| [  184.225983][ T1370] ------------[ cut here ]------------
| [ 184.226333][ T1370] WARNING: CPU: 2 PID: 1370 at ./include/net/netdev_lock.h:17 netif_set_mtu_ext (./include/net/netdev_lock.h:17 ./include/net/netdev_lock.h:15 ./include/net/netdev_lock.h:25 net/core/dev.c:9610) 
| [  184.227624][ T1370] Modules linked in: drop_monitor netdevsim psample act_gact cls_flower sch_ingress
[  184.228832][ T1370] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 184.229226][ T1370] RIP: 0010:netif_set_mtu_ext (./include/net/netdev_lock.h:17 ./include/net/netdev_lock.h:15 ./include/net/netdev_lock.h:25 net/core/dev.c:9610) 
[ 184.229561][ T1370] Code: 00 00 8b 05 97 05 bc 02 85 c0 0f 84 52 fe ff ff 48 8d bb c0 0c 00 00 be ff ff ff ff e8 fa fd 9b 00 85 c0 0f 85 39 fe ff ff 90 <0f> 0b 90 e9 30 fe ff ff 48 b8 00 00 00 00 00 fc ff df 4c 89 fa 48
All code
========
   0:	00 00                	add    %al,(%rax)
   2:	8b 05 97 05 bc 02    	mov    0x2bc0597(%rip),%eax        # 0x2bc059f
   8:	85 c0                	test   %eax,%eax
   a:	0f 84 52 fe ff ff    	je     0xfffffffffffffe62
  10:	48 8d bb c0 0c 00 00 	lea    0xcc0(%rbx),%rdi
  17:	be ff ff ff ff       	mov    $0xffffffff,%esi
  1c:	e8 fa fd 9b 00       	call   0x9bfe1b
  21:	85 c0                	test   %eax,%eax
  23:	0f 85 39 fe ff ff    	jne    0xfffffffffffffe62
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	e9 30 fe ff ff       	jmp    0xfffffffffffffe62
  32:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  39:	fc ff df 
  3c:	4c 89 fa             	mov    %r15,%rdx
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	e9 30 fe ff ff       	jmp    0xfffffffffffffe38
   8:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   f:	fc ff df 
  12:	4c 89 fa             	mov    %r15,%rdx
  15:	48                   	rex.W
[  184.230669][ T1370] RSP: 0018:ffffc90000bd6ef0 EFLAGS: 00010246
[  184.231104][ T1370] RAX: 0000000000000000 RBX: ffff88800b5da000 RCX: 0000000000000001
[  184.231572][ T1370] RDX: 0000000000000000 RSI: ffffffff9f910759 RDI: ffffffff9f058280
[  184.232056][ T1370] RBP: ffffc90000bd6fd8 R08: 0000000000000000 R09: 0000000000000000
[  184.232533][ T1370] R10: ffffc90000bd7008 R11: ffffffffa038d1e0 R12: 1ffff9200017ade2
[  184.233008][ T1370] R13: 00000000000005dc R14: ffffc90000bd7008 R15: ffff88800b5daf48
[  184.233476][ T1370] FS:  00007eff058cb800(0000) GS:ffff8880cb099000(0000) knlGS:0000000000000000
[  184.234051][ T1370] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  184.234456][ T1370] CR2: 00000000004e59f0 CR3: 0000000009f3e005 CR4: 0000000000772ef0
[  184.235168][ T1370] PKRU: 55555554
[  184.235416][ T1370] Call Trace:
[  184.235661][ T1370]  <TASK>
[ 184.235850][ T1370] ? __pfx_netif_set_mtu_ext (net/core/dev.c:9607) 
[ 184.236182][ T1370] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 184.236518][ T1370] netif_set_mtu (net/core/dev.c:9652) 
[ 184.236850][ T1370] ? __pfx_netif_set_mtu (net/core/dev.c:9647) 
[ 184.237180][ T1370] dev_set_mtu (./include/net/netdev_lock.h:30 ./include/net/netdev_lock.h:47 net/core/dev_api.c:249) 
[ 184.237425][ T1370] br_mtu_auto_adjust (net/bridge/br_if.c:525) 
[ 184.237780][ T1370] br_add_if (net/bridge/br_if.c:697) 
[ 184.238038][ T1370] do_set_master (net/core/rtnetlink.c:2948) 
[ 184.238353][ T1370] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 184.238679][ T1370] do_setlink.constprop.0 (net/core/rtnetlink.c:3150) 
[ 184.239014][ T1370] ? __pfx_do_setlink.constprop.0 (net/core/rtnetlink.c:3021) 
[ 184.239411][ T1370] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 184.239725][ T1370] ? validate_chain (kernel/locking/lockdep.c:3804 kernel/locking/lockdep.c:3824 kernel/locking/lockdep.c:3879) 
[ 184.240056][ T1370] ? __kernel_text_address (kernel/extable.c:79) 
[ 184.240376][ T1370] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 184.240695][ T1370] ? __mutex_trylock_common (./arch/x86/include/asm/atomic64_64.h:101 ./include/linux/atomic/atomic-arch-fallback.h:4296 ./include/linux/atomic/atomic-long.h:1482 ./include/linux/atomic/atomic-instrumented.h:4458 kernel/locking/mutex.c:113) 
[ 184.241030][ T1370] ? __pfx___mutex_trylock_common (kernel/locking/mutex.c:88) 
[ 184.241421][ T1370] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 184.241738][ T1370] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 184.242076][ T1370] ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 21)) 
[ 184.242398][ T1370] ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:728 kernel/locking/mutex.c:747) 
[ 184.242718][ T1370] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 184.243046][ T1370] ? rtnl_newlink (net/core/rtnetlink.c:343 net/core/rtnetlink.c:4056) 
[ 184.243369][ T1370] ? __create_object (mm/kmemleak.c:771) 
[ 184.243687][ T1370] ? __pfx___mutex_lock (kernel/locking/mutex.c:746) 
[ 184.244014][ T1370] ? trace_cap_capable (./include/trace/events/capability.h:26 (discriminator 21)) 
[ 184.244332][ T1370] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 184.244715][ T1370] ? __rtnl_newlink (net/core/rtnetlink.c:3907) 
[ 184.245048][ T1370] rtnl_newlink (net/core/rtnetlink.c:351 net/core/rtnetlink.c:4058) 
[ 184.245367][ T1370] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3948) 
[ 184.245681][ T1370] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 184.246032][ T1370] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 184.246355][ T1370] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/rtnetlink.c:6944) 
[ 184.246698][ T1370] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 184.247034][ T1370] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3948) 
[ 184.247350][ T1370] rtnetlink_rcv_msg (net/core/rtnetlink.c:6946) 
[ 184.247680][ T1370] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6849) 
[ 184.248029][ T1370] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 184.248352][ T1370] netlink_rcv_skb (net/netlink/af_netlink.c:2551) 
[ 184.248679][ T1370] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6849) 
[ 184.249012][ T1370] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2528) 
[ 184.249339][ T1370] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/netlink/af_netlink.c:340) 
[ 184.249656][ T1370] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 ./include/net/netns/generic.h:48 net/netlink/af_netlink.c:333) 
[ 184.249994][ T1370] netlink_unicast (net/netlink/af_netlink.c:1321 net/netlink/af_netlink.c:1346) 
[ 184.250325][ T1370] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1331) 
[ 184.250646][ T1370] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 184.250984][ T1370] netlink_sendmsg (net/netlink/af_netlink.c:1896) 
[ 184.251305][ T1370] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1815) 
[ 184.251624][ T1370] ? __import_iovec (lib/iov_iter.c:1441 lib/iov_iter.c:1456) 
[ 184.251959][ T1370] ____sys_sendmsg (net/socket.c:714 net/socket.c:729 net/socket.c:2614) 
[ 184.252280][ T1370] ? __pfx_____sys_sendmsg (net/socket.c:2560) 
[ 184.252593][ T1370] ? __pfx_copy_msghdr_from_user (net/socket.c:2540) 
[ 184.253008][ T1370] ___sys_sendmsg (net/socket.c:2670) 
[ 184.253329][ T1370] ? kasan_record_aux_stack (mm/kasan/generic.c:548) 
[ 184.253643][ T1370] ? __call_rcu_common.constprop.0 (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:127 kernel/rcu/tree.c:3096) 
[ 184.254060][ T1370] ? __pfx____sys_sendmsg (net/socket.c:2657) 
[ 184.254388][ T1370] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 184.254712][ T1370] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 184.255044][ T1370] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 184.255358][ T1370] ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:953 ./include/linux/mmzone.h:2168 arch/x86/mm/physaddr.c:65) 
[ 184.255679][ T1370] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 184.256012][ T1370] __sys_sendmsg (net/socket.c:2700) 
[ 184.256328][ T1370] ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3119) 
[ 184.256711][ T1370] ? __pfx___sys_sendmsg (net/socket.c:2685) 
[ 184.257052][ T1370] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 184.257370][ T1370] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 184.257705][ T1370] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  184.258127][ T1370] RIP: 0033:0x7eff05a981e7
[ 184.258460][ T1370] Code: 0e 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
All code
========
   0:	0e                   	(bad)
   1:	00 f7                	add    %dh,%bh
   3:	d8 64 89 02          	fsubs  0x2(%rcx,%rcx,4)
   7:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   e:	eb b9                	jmp    0xffffffffffffffc9
  10:	0f 1f 00             	nopl   (%rax)
  13:	f3 0f 1e fa          	endbr64
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 10                	jne    0x33
  23:	b8 2e 00 00 00       	mov    $0x2e,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 51                	ja     0x83
  32:	c3                   	ret
  33:	48 83 ec 28          	sub    $0x28,%rsp
  37:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  3b:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 51                	ja     0x59
   8:	c3                   	ret
   9:	48 83 ec 28          	sub    $0x28,%rsp
   d:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  11:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)
[  184.259554][ T1370] RSP: 002b:00007fffc2afb1c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  184.260299][ T1370] RAX: ffffffffffffffda RBX: 00007fffc2afb8f0 RCX: 00007eff05a981e7
[  184.260778][ T1370] RDX: 0000000000000000 RSI: 00007fffc2afb230 RDI: 0000000000000005
[  184.261250][ T1370] RBP: 0000000000000004 R08: 0000000000000003 R09: 0000000000000000
[  184.261960][ T1370] R10: 000000002c920910 R11: 0000000000000246 R12: 0000000000000004
[  184.262434][ T1370] R13: 00000000686e4c72 R14: 0000000000499600 R15: 0000000000000000
| [  185.807031][ T1377] ------------[ cut here ]------------
| [ 185.807332][ T1377] WARNING: CPU: 3 PID: 1377 at ./include/net/netdev_lock.h:17 netif_set_mtu_ext (./include/net/netdev_lock.h:17 ./include/net/netdev_lock.h:15 ./include/net/netdev_lock.h:25 net/core/dev.c:9610) 
| [  185.807934][ T1377] Modules linked in: drop_monitor netdevsim psample act_gact cls_flower sch_ingress
| [  185.810357][ T1377] Tainted: [W]=WARN
[  185.810631][ T1377] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 185.811012][ T1377] RIP: 0010:netif_set_mtu_ext (./include/net/netdev_lock.h:17 ./include/net/netdev_lock.h:15 ./include/net/netdev_lock.h:25 net/core/dev.c:9610) 
[ 185.811318][ T1377] Code: 00 00 8b 05 97 05 bc 02 85 c0 0f 84 52 fe ff ff 48 8d bb c0 0c 00 00 be ff ff ff ff e8 fa fd 9b 00 85 c0 0f 85 39 fe ff ff 90 <0f> 0b 90 e9 30 fe ff ff 48 b8 00 00 00 00 00 fc ff df 4c 89 fa 48
All code
========
   0:	00 00                	add    %al,(%rax)
   2:	8b 05 97 05 bc 02    	mov    0x2bc0597(%rip),%eax        # 0x2bc059f
   8:	85 c0                	test   %eax,%eax
   a:	0f 84 52 fe ff ff    	je     0xfffffffffffffe62
  10:	48 8d bb c0 0c 00 00 	lea    0xcc0(%rbx),%rdi
  17:	be ff ff ff ff       	mov    $0xffffffff,%esi
  1c:	e8 fa fd 9b 00       	call   0x9bfe1b
  21:	85 c0                	test   %eax,%eax
  23:	0f 85 39 fe ff ff    	jne    0xfffffffffffffe62
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	e9 30 fe ff ff       	jmp    0xfffffffffffffe62
  32:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  39:	fc ff df 
  3c:	4c 89 fa             	mov    %r15,%rdx
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	e9 30 fe ff ff       	jmp    0xfffffffffffffe38
   8:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   f:	fc ff df 
  12:	4c 89 fa             	mov    %r15,%rdx
  15:	48                   	rex.W
[  185.812379][ T1377] RSP: 0018:ffffc90000f06ef0 EFLAGS: 00010246
[  185.812765][ T1377] RAX: 0000000000000000 RBX: ffff88800b5da000 RCX: 0000000000000001
[  185.813206][ T1377] RDX: 0000000000000000 RSI: ffffffff9f910759 RDI: ffffffff9f058280
[  185.813645][ T1377] RBP: ffffc90000f06fd8 R08: 0000000000000000 R09: 0000000000000000
[  185.814095][ T1377] R10: ffffc90000f07008 R11: ffffffffa0cceab8 R12: 1ffff920001e0de2
[  185.814547][ T1377] R13: 00000000000005dc R14: ffffc90000f07008 R15: ffff88800b5daf48
[  185.814994][ T1377] FS:  00007fe214bb4800(0000) GS:ffff8880cb119000(0000) knlGS:0000000000000000
[  185.815510][ T1377] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  185.815893][ T1377] CR2: 00000000004e59f8 CR3: 000000000de6e005 CR4: 0000000000772ef0
[  185.816344][ T1377] PKRU: 55555554
[  185.816576][ T1377] Call Trace:
[  185.816805][ T1377]  <TASK>
[ 185.816960][ T1377] ? __pfx_netif_set_mtu_ext (net/core/dev.c:9607) 
[ 185.817259][ T1377] ? mark_held_locks (kernel/locking/lockdep.c:4328) 
[ 185.817553][ T1377] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 185.817970][ T1377] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 185.818278][ T1377] netif_set_mtu (net/core/dev.c:9652) 
[ 185.818575][ T1377] ? __pfx_netif_set_mtu (net/core/dev.c:9647) 
[ 185.818894][ T1377] ? br_get_link_af_size_filtered (net/bridge/br_netlink.c:116) 
[ 185.819269][ T1377] dev_set_mtu (./include/net/netdev_lock.h:30 ./include/net/netdev_lock.h:47 net/core/dev_api.c:249) 
[ 185.819492][ T1377] br_mtu_auto_adjust (net/bridge/br_if.c:525) 
[ 185.819800][ T1377] br_add_if (net/bridge/br_if.c:697) 
[ 185.820034][ T1377] do_set_master (net/core/rtnetlink.c:2948) 
[ 185.820332][ T1377] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 185.820628][ T1377] do_setlink.constprop.0 (net/core/rtnetlink.c:3150) 
[ 185.820950][ T1377] ? __pfx_do_setlink.constprop.0 (net/core/rtnetlink.c:3021) 
[ 185.821326][ T1377] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 185.821622][ T1377] ? mark_held_locks (kernel/locking/lockdep.c:4328) 
[ 185.821924][ T1377] ? irqentry_exit (kernel/entry/common.c:311) 
[ 185.822224][ T1377] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 185.822522][ T1377] ? osq_unlock (./arch/x86/include/asm/atomic.h:107 ./include/linux/atomic/atomic-arch-fallback.h:2203 ./include/linux/atomic/atomic-instrumented.h:1325 kernel/locking/osq_lock.c:218) 
[ 185.822824][ T1377] ? __pfx_osq_unlock (kernel/locking/osq_lock.c:211) 
[ 185.823123][ T1377] ? mutex_spin_on_owner (kernel/locking/mutex.h:45 kernel/locking/mutex.c:351) 
[ 185.823421][ T1377] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 185.823714][ T1377] ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 21)) 
[ 185.824017][ T1377] ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:728 kernel/locking/mutex.c:747) 
[ 185.824315][ T1377] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 185.824608][ T1377] ? rtnl_newlink (net/core/rtnetlink.c:343 net/core/rtnetlink.c:4056) 
[ 185.824906][ T1377] ? __create_object (mm/kmemleak.c:771) 
[ 185.825203][ T1377] ? __pfx___mutex_lock (kernel/locking/mutex.c:746) 
[ 185.825505][ T1377] ? trace_cap_capable (./include/trace/events/capability.h:26 (discriminator 21)) 
[ 185.825808][ T1377] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 185.826174][ T1377] ? __rtnl_newlink (net/core/rtnetlink.c:3907) 
[ 185.826474][ T1377] rtnl_newlink (net/core/rtnetlink.c:351 net/core/rtnetlink.c:4058) 
[ 185.826780][ T1377] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3948) 
[ 185.827073][ T1377] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 185.827371][ T1377] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 185.827670][ T1377] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/rtnetlink.c:6944) 
[ 185.827977][ T1377] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 185.828281][ T1377] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3948) 
[ 185.828578][ T1377] rtnetlink_rcv_msg (net/core/rtnetlink.c:6946) 
[ 185.828883][ T1377] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6849) 
[ 185.829181][ T1377] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 185.829483][ T1377] netlink_rcv_skb (net/netlink/af_netlink.c:2551) 
[ 185.829785][ T1377] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6849) 
[ 185.830091][ T1377] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2528) 
[ 185.830396][ T1377] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/netlink/af_netlink.c:340) 
[ 185.830687][ T1377] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 ./include/net/netns/generic.h:48 net/netlink/af_netlink.c:333) 
[ 185.830993][ T1377] netlink_unicast (net/netlink/af_netlink.c:1321 net/netlink/af_netlink.c:1346) 
[ 185.831289][ T1377] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1331) 
[ 185.831582][ T1377] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 185.831890][ T1377] netlink_sendmsg (net/netlink/af_netlink.c:1896) 
[ 185.832197][ T1377] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1815) 
[ 185.832491][ T1377] ? __import_iovec (lib/iov_iter.c:1441 lib/iov_iter.c:1456) 
[ 185.832801][ T1377] ____sys_sendmsg (net/socket.c:714 net/socket.c:729 net/socket.c:2614) 
[ 185.833101][ T1377] ? __pfx_____sys_sendmsg (net/socket.c:2560) 
[ 185.833390][ T1377] ? __pfx_copy_msghdr_from_user (net/socket.c:2540) 
[ 185.833775][ T1377] ___sys_sendmsg (net/socket.c:2670) 
[ 185.834070][ T1377] ? kasan_record_aux_stack (mm/kasan/generic.c:548) 
[ 185.834364][ T1377] ? __call_rcu_common.constprop.0 (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:127 kernel/rcu/tree.c:3096) 
[ 185.834729][ T1377] ? __pfx____sys_sendmsg (net/socket.c:2657) 
[ 185.835032][ T1377] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 185.835333][ T1377] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 185.835632][ T1377] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 185.835934][ T1377] ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:953 ./include/linux/mmzone.h:2168 arch/x86/mm/physaddr.c:65) 
[ 185.836228][ T1377] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 185.836534][ T1377] __sys_sendmsg (net/socket.c:2700) 
[ 185.836852][ T1377] ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3119) 
[ 185.837213][ T1377] ? __pfx___sys_sendmsg (net/socket.c:2685) 
[ 185.837516][ T1377] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 185.837833][ T1377] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 185.838126][ T1377] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  185.838486][ T1377] RIP: 0033:0x7fe214d811e7
[ 185.838801][ T1377] Code: 0e 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
All code
========
   0:	0e                   	(bad)
   1:	00 f7                	add    %dh,%bh
   3:	d8 64 89 02          	fsubs  0x2(%rcx,%rcx,4)
   7:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   e:	eb b9                	jmp    0xffffffffffffffc9
  10:	0f 1f 00             	nopl   (%rax)
  13:	f3 0f 1e fa          	endbr64
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 10                	jne    0x33
  23:	b8 2e 00 00 00       	mov    $0x2e,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 51                	ja     0x83
  32:	c3                   	ret
  33:	48 83 ec 28          	sub    $0x28,%rsp
  37:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  3b:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 51                	ja     0x59
   8:	c3                   	ret
   9:	48 83 ec 28          	sub    $0x28,%rsp
   d:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  11:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)
[  185.839861][ T1377] RSP: 002b:00007fff5d91bc98 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  185.840302][ T1377] RAX: ffffffffffffffda RBX: 00007fff5d91c3c0 RCX: 00007fe214d811e7
[  185.840746][ T1377] RDX: 0000000000000000 RSI: 00007fff5d91bd00 RDI: 0000000000000005
[  185.841193][ T1377] RBP: 0000000000000004 R08: 0000000000000003 R09: 0000000000000000
[  185.841631][ T1377] R10: 00000000011f7910 R11: 0000000000000246 R12: 0000000000000004
[  185.842080][ T1377] R13: 00000000686e4c74 R14: 0000000000499600 R15: 0000000000000000
| [  190.828698][   T12] ------------[ cut here ]------------
| [ 190.829035][ T12] WARNING: CPU: 0 PID: 12 at ./include/net/netdev_lock.h:17 netif_set_mtu_ext (./include/net/netdev_lock.h:17 ./include/net/netdev_lock.h:15 ./include/net/netdev_lock.h:25 net/core/dev.c:9610) 
| [  190.829561][   T12] Modules linked in: drop_monitor netdevsim psample act_gact cls_flower sch_ingress
| [  190.831104][   T12] Tainted: [W]=WARN
[  190.831327][   T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  190.831723][   T12] Workqueue: netns cleanup_net
[ 190.832064][ T12] RIP: 0010:netif_set_mtu_ext (./include/net/netdev_lock.h:17 ./include/net/netdev_lock.h:15 ./include/net/netdev_lock.h:25 net/core/dev.c:9610) 
[ 190.832389][ T12] Code: 00 00 8b 05 97 05 bc 02 85 c0 0f 84 52 fe ff ff 48 8d bb c0 0c 00 00 be ff ff ff ff e8 fa fd 9b 00 85 c0 0f 85 39 fe ff ff 90 <0f> 0b 90 e9 30 fe ff ff 48 b8 00 00 00 00 00 fc ff df 4c 89 fa 48
All code
========
   0:	00 00                	add    %al,(%rax)
   2:	8b 05 97 05 bc 02    	mov    0x2bc0597(%rip),%eax        # 0x2bc059f
   8:	85 c0                	test   %eax,%eax
   a:	0f 84 52 fe ff ff    	je     0xfffffffffffffe62
  10:	48 8d bb c0 0c 00 00 	lea    0xcc0(%rbx),%rdi
  17:	be ff ff ff ff       	mov    $0xffffffff,%esi
  1c:	e8 fa fd 9b 00       	call   0x9bfe1b
  21:	85 c0                	test   %eax,%eax
  23:	0f 85 39 fe ff ff    	jne    0xfffffffffffffe62
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	e9 30 fe ff ff       	jmp    0xfffffffffffffe62
  32:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  39:	fc ff df 
  3c:	4c 89 fa             	mov    %r15,%rdx
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	e9 30 fe ff ff       	jmp    0xfffffffffffffe38
   8:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   f:	fc ff df 
  12:	4c 89 fa             	mov    %r15,%rdx
  15:	48                   	rex.W
[  190.833475][   T12] RSP: 0018:ffffc900000c75b0 EFLAGS: 00010246
[  190.833855][   T12] RAX: 0000000000000000 RBX: ffff88800b5da000 RCX: 0000000000000001
[  190.834301][   T12] RDX: 0000000000000000 RSI: ffffffff9f910759 RDI: ffffffff9f058280
[  190.834771][   T12] RBP: ffffc900000c7698 R08: 0000000000000000 R09: 0000000000000000
[  190.835221][   T12] R10: ffffc900000c76c8 R11: ffffffff9c29be78 R12: 1ffff92000018eba
[  190.835661][   T12] R13: 00000000000005dc R14: ffffc900000c76c8 R15: ffff88800b5daf48
[  190.836112][   T12] FS:  0000000000000000(0000) GS:ffff8880caf99000(0000) knlGS:0000000000000000
[  190.836648][   T12] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  190.837024][   T12] CR2: 00007faf275d3000 CR3: 000000006894a004 CR4: 0000000000772ef0
[  190.837483][   T12] PKRU: 55555554
[  190.837722][   T12] Call Trace:
[  190.837950][   T12]  <TASK>
[ 190.838100][ T12] ? __call_rcu_common.constprop.0 (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:127 kernel/rcu/tree.c:3096) 
[ 190.838461][ T12] ? br_del_if (net/bridge/br_if.c:742) 
[ 190.838683][ T12] ? br_device_event (net/bridge/br.c:141) 
[ 190.838979][ T12] ? notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) 
[ 190.839277][ T12] ? __pfx_netif_set_mtu_ext (net/core/dev.c:9607) 
[ 190.839596][ T12] ? cleanup_net (net/core/net_namespace.c:684) 
[ 190.839895][ T12] ? process_one_work (kernel/workqueue.c:3238) 
[ 190.840191][ T12] ? worker_thread (kernel/workqueue.c:3315 kernel/workqueue.c:3402) 
[ 190.840491][ T12] ? kthread (kernel/kthread.c:464) 
[ 190.840721][ T12] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 190.841034][ T12] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 190.841329][ T12] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 190.841645][ T12] netif_set_mtu (net/core/dev.c:9652) 
[ 190.841952][ T12] ? __pfx_netif_set_mtu (net/core/dev.c:9647) 
[ 190.842262][ T12] dev_set_mtu (./include/net/netdev_lock.h:30 ./include/net/netdev_lock.h:47 net/core/dev_api.c:249) 
[ 190.842482][ T12] br_mtu_auto_adjust (net/bridge/br_if.c:525) 
[ 190.842788][ T12] br_del_if (net/bridge/br_if.c:743) 
[ 190.843011][ T12] br_device_event (net/bridge/br.c:141) 
[ 190.843312][ T12] ? __pfx_br_device_event (net/bridge/br.c:29) 
[ 190.843618][ T12] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) 
[ 190.843927][ T12] unregister_netdevice_many_notify (net/core/dev.c:12107) 
[ 190.844331][ T12] ? mutex_is_locked (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-long.h:38 ./include/linux/atomic/atomic-instrumented.h:3189 kernel/locking/mutex.h:47 kernel/locking/mutex.c:67) 
[ 190.844635][ T12] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:12032) 
[ 190.845020][ T12] ? unregister_netdevice_queue (net/core/dev.c:12004) 
[ 190.845393][ T12] ? __pfx_unregister_netdevice_queue (net/core/dev.c:12003) 
[ 190.845767][ T12] ? __pfx_unregister_netdevice_queue (net/core/dev.c:12003) 
[ 190.846141][ T12] default_device_exit_batch (net/core/dev.c:12673) 
[ 190.846440][ T12] ? __pfx_default_device_exit_batch (net/core/dev.c:12648) 
[ 190.846817][ T12] ops_undo_list (net/core/net_namespace.c:204 net/core/net_namespace.c:251) 
[ 190.847124][ T12] ? __pfx_ops_undo_list (net/core/net_namespace.c:222) 
[ 190.847424][ T12] ? cleanup_net (./include/linux/list.h:183 net/core/net_namespace.c:679) 
[ 190.847767][ T12] cleanup_net (net/core/net_namespace.c:684) 
[ 190.848071][ T12] ? __pfx_cleanup_net (net/core/net_namespace.c:648) 
[ 190.848380][ T12] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 190.848694][ T12] process_one_work (kernel/workqueue.c:3238) 
[ 190.849007][ T12] ? __pfx_process_one_work (kernel/workqueue.c:3140) 
[ 190.849303][ T12] ? assign_work (kernel/workqueue.c:1200) 
[ 190.849599][ T12] worker_thread (kernel/workqueue.c:3315 kernel/workqueue.c:3402) 
[ 190.849937][ T12] ? __pfx_worker_thread (kernel/workqueue.c:3348) 
[ 190.850231][ T12] kthread (kernel/kthread.c:464) 
[ 190.850452][ T12] ? __pfx_kthread (kernel/kthread.c:413) 
[ 190.850740][ T12] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 190.851060][ T12] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 190.851368][ T12] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 190.851662][ T12] ? __pfx_kthread (kernel/kthread.c:413) 
[ 190.851967][ T12] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 190.852254][ T12] ? __pfx_kthread (kernel/kthread.c:413) 


Finger prints:
netif_set_mtu_ext:netif_set_mtu:dev_set_mtu:br_mtu_auto_adjust:br_del_if
netif_set_mtu_ext:netif_set_mtu:dev_set_mtu:br_mtu_auto_adjust:br_add_if