======================================
| [  181.447469][ T1151] br0: port 1(eth0) entered forwarding state
| [  181.449111][ T1151] ------------[ cut here ]------------
| [ 181.450093][ T1151] WARNING: CPU: 0 PID: 1151 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) 
| [  181.450728][ T1151] Modules linked in: sctp_diag sctp [last unloaded: ila]
[  181.451766][ T1151] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 181.452157][ T1151] 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) 
[ 181.452508][ T1151] Code: 00 00 8b 05 77 04 bc 02 85 c0 0f 84 52 fe ff ff 48 8d bb c0 0c 00 00 be ff ff ff ff e8 da fc 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 77 04 bc 02    	mov    0x2bc0477(%rip),%eax        # 0x2bc047f
   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 da fc 9b 00       	call   0x9bfcfb
  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
[  181.453832][ T1151] RSP: 0018:ffffc90000d16ef0 EFLAGS: 00010246
[  181.454226][ T1151] RAX: 0000000000000000 RBX: ffff88800f06a000 RCX: 0000000000000001
[  181.454699][ T1151] RDX: 0000000000000000 RSI: ffffffffac110751 RDI: ffffffffab858280
[  181.455164][ T1151] RBP: ffffc90000d16fd8 R08: 0000000000000000 R09: 0000000000000000
[  181.455640][ T1151] R10: ffffc90000d17008 R11: ffffffffacb8d1e0 R12: 1ffff920001a2de2
[  181.456102][ T1151] R13: 00000000000005dc R14: ffffc90000d17008 R15: ffff88800f06af48
[  181.456585][ T1151] FS:  00007f1f87f82800(0000) GS:ffff8880be799000(0000) knlGS:0000000000000000
[  181.457132][ T1151] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  181.457535][ T1151] CR2: 00000000004e59f0 CR3: 0000000040957001 CR4: 0000000000772ef0
[  181.458017][ T1151] PKRU: 55555554
[  181.458255][ T1151] Call Trace:
[  181.458498][ T1151]  <TASK>
[ 181.458660][ T1151] ? __pfx_netif_set_mtu_ext (net/core/dev.c:9607) 
[ 181.458976][ T1151] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 181.459305][ T1151] netif_set_mtu (net/core/dev.c:9652) 
[ 181.459637][ T1151] ? __pfx_netif_set_mtu (net/core/dev.c:9647) 
[ 181.459966][ T1151] dev_set_mtu (./include/net/netdev_lock.h:30 ./include/net/netdev_lock.h:47 net/core/dev_api.c:249) 
[ 181.460208][ T1151] br_mtu_auto_adjust (net/bridge/br_if.c:525) 
[ 181.460540][ T1151] br_add_if (net/bridge/br_if.c:697) 
[ 181.460788][ T1151] do_set_master (./include/net/netdev_lock.h:30 ./include/net/netdev_lock.h:41 net/core/rtnetlink.c:2949) 
[ 181.461094][ T1151] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 181.461417][ T1151] do_setlink.constprop.0 (net/core/rtnetlink.c:3150) 
[ 181.461731][ T1151] ? __pfx_do_setlink.constprop.0 (net/core/rtnetlink.c:3021) 
[ 181.462123][ T1151] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 181.462449][ T1151] ? validate_chain (kernel/locking/lockdep.c:3804 kernel/locking/lockdep.c:3824 kernel/locking/lockdep.c:3879) 
[ 181.462757][ T1151] ? __kernel_text_address (kernel/extable.c:79) 
[ 181.463066][ T1151] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 181.463406][ T1151] ? __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) 
[ 181.463717][ T1151] ? __pfx___mutex_trylock_common (kernel/locking/mutex.c:88) 
[ 181.464096][ T1151] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 181.464418][ T1151] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 181.464733][ T1151] ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 21)) 
[ 181.465042][ T1151] ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:728 kernel/locking/mutex.c:747) 
[ 181.465353][ T1151] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 181.465673][ T1151] ? rtnl_newlink (net/core/rtnetlink.c:343 net/core/rtnetlink.c:4056) 
[ 181.465981][ T1151] ? __create_object (mm/kmemleak.c:771) 
[ 181.466296][ T1151] ? __pfx___mutex_lock (kernel/locking/mutex.c:746) 
[ 181.466616][ T1151] ? trace_cap_capable (./include/trace/events/capability.h:26 (discriminator 21)) 
[ 181.466929][ T1151] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 181.467316][ T1151] ? __rtnl_newlink (net/core/rtnetlink.c:3907) 
[ 181.467641][ T1151] rtnl_newlink (net/core/rtnetlink.c:351 net/core/rtnetlink.c:4058) 
[ 181.467993][ T1151] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3948) 
[ 181.468306][ T1151] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 181.468645][ T1151] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 181.468960][ T1151] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/rtnetlink.c:6944) 
[ 181.469266][ T1151] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 181.469595][ T1151] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3948) 
[ 181.469919][ T1151] rtnetlink_rcv_msg (net/core/rtnetlink.c:6946) 
[ 181.470233][ T1151] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6849) 
[ 181.470553][ T1151] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 181.470865][ T1151] netlink_rcv_skb (net/netlink/af_netlink.c:2551) 
[ 181.471174][ T1151] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6849) 
[ 181.471492][ T1151] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2528) 
[ 181.471815][ T1151] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/netlink/af_netlink.c:340) 
[ 181.472127][ T1151] ? 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) 
[ 181.472447][ T1151] netlink_unicast (net/netlink/af_netlink.c:1321 net/netlink/af_netlink.c:1346) 
[ 181.472760][ T1151] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1331) 
[ 181.473069][ T1151] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 181.473399][ T1151] netlink_sendmsg (net/netlink/af_netlink.c:1896) 
[ 181.473712][ T1151] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1815) 
[ 181.474118][ T1151] ? __import_iovec (lib/iov_iter.c:1441 lib/iov_iter.c:1456) 
[ 181.474454][ T1151] ____sys_sendmsg (net/socket.c:714 net/socket.c:729 net/socket.c:2614) 
[ 181.474772][ T1151] ? __pfx_____sys_sendmsg (net/socket.c:2560) 
[ 181.475079][ T1151] ? __pfx_copy_msghdr_from_user (net/socket.c:2540) 
[ 181.475486][ T1151] ___sys_sendmsg (net/socket.c:2670) 
[ 181.475798][ T1151] ? kasan_record_aux_stack (mm/kasan/generic.c:548) 
[ 181.476105][ T1151] ? __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) 
[ 181.476497][ T1151] ? __pfx____sys_sendmsg (net/socket.c:2657) 
[ 181.476817][ T1151] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 181.477131][ T1151] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 181.477454][ T1151] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 181.477762][ T1151] ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:953 ./include/linux/mmzone.h:2168 arch/x86/mm/physaddr.c:65) 
[ 181.478070][ T1151] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 181.478397][ T1151] __sys_sendmsg (net/socket.c:2700) 
[ 181.478982][ T1151] ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3119) 
[ 181.479390][ T1151] ? __pfx___sys_sendmsg (net/socket.c:2685) 
[ 181.479727][ T1151] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 181.480041][ T1151] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 181.480579][ T1151] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  181.480962][ T1151] RIP: 0033:0x7f1f8814f1e7
[ 181.481285][ T1151] 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)
[  181.482638][ T1151] RSP: 002b:00007ffc08d13898 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  181.483107][ T1151] RAX: ffffffffffffffda RBX: 00007ffc08d13fc0 RCX: 00007f1f8814f1e7
[  181.483793][ T1151] RDX: 0000000000000000 RSI: 00007ffc08d13900 RDI: 0000000000000005
[  181.484266][ T1151] RBP: 0000000000000004 R08: 0000000000000003 R09: 0000000000000000
[  181.484956][ T1151] R10: 000000001f742910 R11: 0000000000000246 R12: 0000000000000004
[  181.485432][ T1151] R13: 00000000686e763a R14: 0000000000499600 R15: 0000000000000000
| [  183.119040][ T1158] ------------[ cut here ]------------
| [ 183.120144][ T1158] WARNING: CPU: 2 PID: 1158 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) 
| [  183.121265][ T1158] Modules linked in: sctp_diag sctp [last unloaded: ila]
| [  183.123162][ T1158] Tainted: [W]=WARN
[  183.123632][ T1158] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 183.124333][ T1158] 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) 
[ 183.124946][ T1158] Code: 00 00 8b 05 77 04 bc 02 85 c0 0f 84 52 fe ff ff 48 8d bb c0 0c 00 00 be ff ff ff ff e8 da fc 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 77 04 bc 02    	mov    0x2bc0477(%rip),%eax        # 0x2bc047f
   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 da fc 9b 00       	call   0x9bfcfb
  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
[  183.126917][ T1158] RSP: 0018:ffffc90000d76ef0 EFLAGS: 00010246
[  183.127655][ T1158] RAX: 0000000000000000 RBX: ffff88800f06a000 RCX: 0000000000000001
[  183.128517][ T1158] RDX: 0000000000000000 RSI: ffffffffac110751 RDI: ffffffffab858280
[  183.129349][ T1158] RBP: ffffc90000d76fd8 R08: 0000000000000000 R09: 0000000000000000
[  183.130207][ T1158] R10: ffffc90000d77008 R11: ffffffffacb8d1e0 R12: 1ffff920001aede2
[  183.131078][ T1158] R13: 00000000000005dc R14: ffffc90000d77008 R15: ffff88800f06af48
[  183.131951][ T1158] FS:  00007f25c1e4c800(0000) GS:ffff8880be899000(0000) knlGS:0000000000000000
[  183.132936][ T1158] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  183.133660][ T1158] CR2: 00000000004e59f8 CR3: 0000000009b4d003 CR4: 0000000000772ef0
[  183.134530][ T1158] PKRU: 55555554
[  183.134955][ T1158] Call Trace:
[  183.135407][ T1158]  <TASK>
[ 183.135718][ T1158] ? __pfx_netif_set_mtu_ext (net/core/dev.c:9607) 
[ 183.136291][ T1158] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 183.136897][ T1158] netif_set_mtu (net/core/dev.c:9652) 
[ 183.137492][ T1158] ? __pfx_netif_set_mtu (net/core/dev.c:9647) 
[ 183.138089][ T1158] dev_set_mtu (./include/net/netdev_lock.h:30 ./include/net/netdev_lock.h:47 net/core/dev_api.c:249) 
[ 183.138562][ T1158] br_mtu_auto_adjust (net/bridge/br_if.c:525) 
[ 183.139140][ T1158] br_add_if (net/bridge/br_if.c:697) 
[ 183.139617][ T1158] do_set_master (./include/net/netdev_lock.h:30 ./include/net/netdev_lock.h:41 net/core/rtnetlink.c:2949) 
[ 183.140204][ T1158] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 183.140800][ T1158] do_setlink.constprop.0 (net/core/rtnetlink.c:3150) 
[ 183.141401][ T1158] ? __pfx_do_setlink.constprop.0 (net/core/rtnetlink.c:3021) 
[ 183.142120][ T1158] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 183.142723][ T1158] ? validate_chain (kernel/locking/lockdep.c:3804 kernel/locking/lockdep.c:3824 kernel/locking/lockdep.c:3879) 
[ 183.143276][ T1158] ? __kernel_text_address (kernel/extable.c:79) 
[ 183.143874][ T1158] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 183.144466][ T1158] ? __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) 
[ 183.145026][ T1158] ? __pfx___mutex_trylock_common (kernel/locking/mutex.c:88) 
[ 183.145736][ T1158] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 183.146319][ T1158] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 183.146923][ T1158] ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 21)) 
[ 183.147509][ T1158] ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:728 kernel/locking/mutex.c:747) 
[ 183.148066][ T1158] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 183.148675][ T1158] ? rtnl_newlink (net/core/rtnetlink.c:343 net/core/rtnetlink.c:4056) 
[ 183.149244][ T1158] ? __create_object (mm/kmemleak.c:771) 
[ 183.149832][ T1158] ? __pfx___mutex_lock (kernel/locking/mutex.c:746) 
[ 183.150453][ T1158] ? trace_cap_capable (./include/trace/events/capability.h:26 (discriminator 21)) 
[ 183.151011][ T1158] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 183.151719][ T1158] ? __rtnl_newlink (net/core/rtnetlink.c:3907) 
[ 183.152295][ T1158] rtnl_newlink (net/core/rtnetlink.c:351 net/core/rtnetlink.c:4058) 
[ 183.152899][ T1158] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3948) 
[ 183.153482][ T1158] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 183.154061][ T1158] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 183.154670][ T1158] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/rtnetlink.c:6944) 
[ 183.155225][ T1158] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 183.155816][ T1158] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3948) 
[ 183.156399][ T1158] rtnetlink_rcv_msg (net/core/rtnetlink.c:6946) 
[ 183.156967][ T1158] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6849) 
[ 183.157581][ T1158] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 183.158155][ T1158] netlink_rcv_skb (net/netlink/af_netlink.c:2551) 
[ 183.158753][ T1158] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6849) 
[ 183.159331][ T1158] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2528) 
[ 183.159949][ T1158] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/netlink/af_netlink.c:340) 
[ 183.160530][ T1158] ? 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) 
[ 183.161087][ T1158] netlink_unicast (net/netlink/af_netlink.c:1321 net/netlink/af_netlink.c:1346) 
[ 183.161696][ T1158] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1331) 
[ 183.162262][ T1158] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 183.162881][ T1158] netlink_sendmsg (net/netlink/af_netlink.c:1896) 
[ 183.163471][ T1158] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1815) 
[ 183.164025][ T1158] ? __import_iovec (lib/iov_iter.c:1441 lib/iov_iter.c:1456) 
[ 183.164620][ T1158] ____sys_sendmsg (net/socket.c:714 net/socket.c:729 net/socket.c:2614) 
[ 183.165185][ T1158] ? __pfx_____sys_sendmsg (net/socket.c:2560) 
[ 183.165779][ T1158] ? __pfx_copy_msghdr_from_user (net/socket.c:2540) 
[ 183.166541][ T1158] ___sys_sendmsg (net/socket.c:2670) 
[ 183.167103][ T1158] ? kasan_record_aux_stack (mm/kasan/generic.c:548) 
[ 183.167685][ T1158] ? __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) 
[ 183.168398][ T1158] ? __pfx____sys_sendmsg (net/socket.c:2657) 
[ 183.168969][ T1158] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 183.169563][ T1158] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 183.170255][ T1158] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 183.170901][ T1158] ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:953 ./include/linux/mmzone.h:2168 arch/x86/mm/physaddr.c:65) 
[ 183.171479][ T1158] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 183.172069][ T1158] __sys_sendmsg (net/socket.c:2700) 
[ 183.172653][ T1158] ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3119) 
[ 183.173345][ T1158] ? __pfx___sys_sendmsg (net/socket.c:2685) 
[ 183.173953][ T1158] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 183.174563][ T1158] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 183.175137][ T1158] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  183.175842][ T1158] RIP: 0033:0x7f25c20191e7
[ 183.176449][ T1158] 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)
[  183.178432][ T1158] RSP: 002b:00007ffef2a8fed8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  183.179300][ T1158] RAX: ffffffffffffffda RBX: 00007ffef2a90600 RCX: 00007f25c20191e7
[  183.180156][ T1158] RDX: 0000000000000000 RSI: 00007ffef2a8ff40 RDI: 0000000000000005
[  183.180994][ T1158] RBP: 0000000000000004 R08: 0000000000000003 R09: 0000000000000000
[  183.181842][ T1158] R10: 000000000458a910 R11: 0000000000000246 R12: 0000000000000004
[  183.182698][ T1158] R13: 00000000686e763c R14: 0000000000499600 R15: 0000000000000000
| [  188.232389][   T12] ------------[ cut here ]------------
| [ 188.232698][ 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) 
| [  188.233210][   T12] Modules linked in: sctp_diag sctp [last unloaded: ila]
| [  188.234673][   T12] Tainted: [W]=WARN
[  188.234902][   T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  188.235386][   T12] Workqueue: netns cleanup_net
[ 188.235716][ 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) 
[ 188.236027][ T12] Code: 00 00 8b 05 77 04 bc 02 85 c0 0f 84 52 fe ff ff 48 8d bb c0 0c 00 00 be ff ff ff ff e8 da fc 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 77 04 bc 02    	mov    0x2bc0477(%rip),%eax        # 0x2bc047f
   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 da fc 9b 00       	call   0x9bfcfb
  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
[  188.237087][   T12] RSP: 0018:ffffc900000c75b0 EFLAGS: 00010246
[  188.237672][   T12] RAX: 0000000000000000 RBX: ffff88800f06a000 RCX: 0000000000000001
[  188.238122][   T12] RDX: 0000000000000000 RSI: ffffffffac110751 RDI: ffffffffab858280
[  188.238873][   T12] RBP: ffffc900000c7698 R08: 0000000000000000 R09: 0000000000000000
[  188.239317][   T12] R10: ffffc900000c76c8 R11: ffffffffa8a9be78 R12: 1ffff92000018eba
[  188.239912][   T12] R13: 00000000000005dc R14: ffffc900000c76c8 R15: ffff88800f06af48
[  188.240360][   T12] FS:  0000000000000000(0000) GS:ffff8880be799000(0000) knlGS:0000000000000000
[  188.241014][   T12] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  188.241487][   T12] CR2: 00007ffdba040cc8 CR3: 0000000009c7e001 CR4: 0000000000772ef0
[  188.241931][   T12] PKRU: 55555554
[  188.242153][   T12] Call Trace:
[  188.242389][   T12]  <TASK>
[ 188.242537][ 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) 
[ 188.242911][ T12] ? br_del_if (net/bridge/br_if.c:742) 
[ 188.243136][ T12] ? br_device_event (net/bridge/br.c:141) 
[ 188.243448][ T12] ? notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) 
[ 188.243750][ T12] ? __pfx_netif_set_mtu_ext (net/core/dev.c:9607) 
[ 188.244045][ T12] ? cleanup_net (net/core/net_namespace.c:684) 
[ 188.244344][ T12] ? process_one_work (kernel/workqueue.c:3238) 
[ 188.244660][ T12] ? worker_thread (kernel/workqueue.c:3315 kernel/workqueue.c:3402) 
[ 188.244964][ T12] ? kthread (kernel/kthread.c:464) 
[ 188.245187][ T12] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 188.245501][ T12] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 188.245804][ T12] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 188.246113][ T12] netif_set_mtu (net/core/dev.c:9652) 
[ 188.246419][ T12] ? __pfx_netif_set_mtu (net/core/dev.c:9647) 
[ 188.246731][ T12] dev_set_mtu (./include/net/netdev_lock.h:30 ./include/net/netdev_lock.h:47 net/core/dev_api.c:249) 
[ 188.246963][ T12] br_mtu_auto_adjust (net/bridge/br_if.c:525) 
[ 188.247258][ T12] br_del_if (net/bridge/br_if.c:743) 
[ 188.247495][ T12] br_device_event (net/bridge/br.c:141) 
[ 188.247791][ T12] ? __pfx_br_device_event (net/bridge/br.c:29) 
[ 188.248097][ T12] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) 
[ 188.248410][ T12] unregister_netdevice_many_notify (net/core/dev.c:12107) 
[ 188.248785][ 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) 
[ 188.249080][ T12] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:12032) 
[ 188.249466][ T12] ? unregister_netdevice_queue (net/core/dev.c:12004) 
[ 188.249846][ T12] ? __pfx_unregister_netdevice_queue (net/core/dev.c:12003) 
[ 188.250218][ T12] ? __pfx_unregister_netdevice_queue (net/core/dev.c:12003) 
[ 188.250609][ T12] default_device_exit_batch (net/core/dev.c:12673) 
[ 188.250907][ T12] ? __pfx_default_device_exit_batch (net/core/dev.c:12648) 
[ 188.251285][ T12] ops_undo_list (net/core/net_namespace.c:250) 
[ 188.251603][ T12] ? __pfx_ops_undo_list (net/core/net_namespace.c:222) 
[ 188.251900][ T12] ? cleanup_net (./include/linux/list.h:183 net/core/net_namespace.c:679) 
[ 188.252206][ T12] cleanup_net (net/core/net_namespace.c:684) 
[ 188.252516][ T12] ? __pfx_cleanup_net (net/core/net_namespace.c:648) 
[ 188.252822][ T12] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 188.253125][ T12] process_one_work (kernel/workqueue.c:3238) 
[ 188.253440][ T12] ? __pfx_process_one_work (kernel/workqueue.c:3140) 
[ 188.253752][ T12] ? assign_work (kernel/workqueue.c:1200) 
[ 188.254050][ T12] worker_thread (kernel/workqueue.c:3315 kernel/workqueue.c:3402) 
[ 188.254350][ T12] ? __pfx_worker_thread (kernel/workqueue.c:3348) 
[ 188.254659][ T12] kthread (kernel/kthread.c:464) 
[ 188.254881][ T12] ? __pfx_kthread (kernel/kthread.c:413) 
[ 188.255166][ T12] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 188.255468][ T12] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 188.255765][ T12] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 188.256064][ T12] ? __pfx_kthread (kernel/kthread.c:413) 
[ 188.256355][ T12] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 188.256658][ 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