======================================
| 0
| xx__-> [   11.255060][  T228] ------------[ cut here ]------------
| [ 11.255700][ T228] WARNING: CPU: 2 PID: 228 at ./include/net/netdev_lock.h:52 __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
| [   11.256410][  T228] Modules linked in: netdevsim
[   11.257611][  T228] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 11.258127][ T228] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
[ 11.258609][ T228] Code: 00 e8 b3 48 fe ff 48 8b 5c 24 58 e9 87 fb ff ff 49 8d bf 98 0c 00 00 be ff ff ff ff e8 b8 56 78 00 85 c0 0f 85 99 00 00 00 90 <0f> 0b 90 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 20 48 c1 ea 03
All code
========
   0:	00 e8                	add    %ch,%al
   2:	b3 48                	mov    $0x48,%bl
   4:	fe                   	(bad)
   5:	ff 48 8b             	decl   -0x75(%rax)
   8:	5c                   	pop    %rsp
   9:	24 58                	and    $0x58,%al
   b:	e9 87 fb ff ff       	jmp    0xfffffffffffffb97
  10:	49 8d bf 98 0c 00 00 	lea    0xc98(%r15),%rdi
  17:	be ff ff ff ff       	mov    $0xffffffff,%esi
  1c:	e8 b8 56 78 00       	call   0x7856d9
  21:	85 c0                	test   %eax,%eax
  23:	0f 85 99 00 00 00    	jne    0xc2
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  34:	fc ff df 
  37:	48 8b 54 24 20       	mov    0x20(%rsp),%rdx
  3c:	48 c1 ea 03          	shr    $0x3,%rdx

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   a:	fc ff df 
   d:	48 8b 54 24 20       	mov    0x20(%rsp),%rdx
  12:	48 c1 ea 03          	shr    $0x3,%rdx
[   11.259825][  T228] RSP: 0018:ffffc90000b07520 EFLAGS: 00010246
[   11.260302][  T228] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   11.260853][  T228] RDX: 0000000000000000 RSI: ffff888004e7ac98 RDI: ffff888004e72e38
[   11.261423][  T228] RBP: ffffffff8e924440 R08: 0000000000000000 R09: fffffbfff18fd844
[   11.261959][  T228] R10: ffffffff8c7ec227 R11: ffff888004e72300 R12: 0000000000000000
[   11.262505][  T228] R13: ffff888004e7a128 R14: ffff888004e7a008 R15: ffff888004e7a000
[   11.263068][  T228] FS:  00007f0f965e1740(0000) GS:ffff888036100000(0000) knlGS:0000000000000000
[   11.263726][  T228] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   11.264189][  T228] CR2: 000055954c8c84c8 CR3: 0000000004f18005 CR4: 0000000000772ef0
[   11.264752][  T228] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   11.265286][  T228] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   11.265835][  T228] PKRU: 55555554
[   11.266135][  T228] Call Trace:
[   11.266424][  T228]  <TASK>
[ 11.266639][ T228] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
[ 11.267042][ T228] ? __warn (kernel/panic.c:748) 
[ 11.267329][ T228] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
[ 11.267722][ T228] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 11.268115][ T228] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 11.268409][ T228] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 11.268799][ T228] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 11.269209][ T228] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
[ 11.269607][ T228] ? __pfx___netdev_update_features (net/core/dev.c:10589) 
[ 11.270096][ T228] ? _raw_spin_unlock_irq (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:97 ./include/linux/spinlock_api_smp.h:159 kernel/locking/spinlock.c:202) 
[ 11.270415][ T228] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 11.270681][ T228] register_netdevice (net/core/dev.c:11033) 
[ 11.270936][ T228] ? __pfx_register_netdevice (net/core/dev.c:10911) 
[ 11.271186][ T228] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 11.271444][ T228] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 11.271756][ T228] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 11.271946][ T228] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 11.272255][ T228] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 11.272557][ T228] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[ 11.272868][ T228] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[ 11.273119][ T228] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[ 11.273418][ T228] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[ 11.273673][ T228] ? kernfs_put (./arch/x86/include/asm/atomic.h:67 (discriminator 1) ./include/linux/atomic/atomic-arch-fallback.h:2278 (discriminator 1) ./include/linux/atomic/atomic-instrumented.h:1384 (discriminator 1) fs/kernfs/dir.c:557 (discriminator 1)) 
[ 11.273859][ T228] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[ 11.274110][ T228] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[ 11.274358][ T228] __driver_probe_device (drivers/base/dd.c:800) 
[ 11.274599][ T228] driver_probe_device (drivers/base/dd.c:830) 
[ 11.274856][ T228] __device_attach_driver (drivers/base/dd.c:959) 
[ 11.275096][ T228] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[ 11.275385][ T228] bus_for_each_drv (drivers/base/bus.c:462) 
[ 11.275624][ T228] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[ 11.275870][ T228] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 11.276112][ T228] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 11.276352][ T228] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 11.276598][ T228] __device_attach (drivers/base/dd.c:1030) 
[ 11.276847][ T228] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[ 11.277083][ T228] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 11.277323][ T228] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 11.277574][ T228] bus_probe_device (drivers/base/bus.c:537) 
[ 11.277830][ T228] device_add (drivers/base/core.c:3672) 
[ 11.278081][ T228] ? __pfx_device_add (drivers/base/core.c:3548) 
[ 11.278318][ T228] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[ 11.278572][ T228] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[ 11.278891][ T228] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[ 11.279198][ T228] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 11.279434][ T228] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[ 11.279693][ T228] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 11.279943][ T228] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 11.280195][ T228] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[ 11.280415][ T228] ? __pfx_vfs_write (fs/read_write.c:660) 
[ 11.280674][ T228] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 11.280912][ T228] ? do_user_addr_fault (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[ 11.281160][ T228] ? __pfx___up_read (kernel/locking/rwsem.c:1337) 
[ 11.281406][ T228] ksys_write (fs/read_write.c:731) 
[ 11.281594][ T228] ? __pfx_ksys_write (fs/read_write.c:721) 
[ 11.281843][ T228] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[ 11.282098][ T228] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 11.282343][ T228] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   11.282631][  T228] RIP: 0033:0x7f0f96722b77
[ 11.282893][ T228] Code: 0b 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24
All code
========
   0:	0b 00                	or     (%rax),%eax
   2:	f7 d8                	neg    %eax
   4:	64 89 02             	mov    %eax,%fs:(%rdx)
   7:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   e:	eb b7                	jmp    0xffffffffffffffc7
  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 01 00 00 00       	mov    $0x1,%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:	48 89 54 24 18       	mov    %rdx,0x18(%rsp)
  3c:	48                   	rex.W
  3d:	89                   	.byte 0x89
  3e:	74 24                	je     0x64

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:	48 89 54 24 18       	mov    %rdx,0x18(%rsp)
  12:	48                   	rex.W
  13:	89                   	.byte 0x89
  14:	74 24                	je     0x3a
[   11.283708][  T228] RSP: 002b:00007ffc91676d78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   11.284071][  T228] RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 00007f0f96722b77
[   11.284417][  T228] RDX: 0000000000000007 RSI: 000055954c8c74c0 RDI: 0000000000000001
[   11.284787][  T228] RBP: 000055954c8c74c0 R08: 0000000000000003 R09: 0000000000000077
[   11.285137][  T228] R10: 0000000000000063 R11: 0000000000000246 R12: 0000000000000007
[   11.285487][  T228] R13: 00007f0f967de760 R14: 0000000000000007 R15: 00007f0f967d99c0
| [   11.577407][  T255] ------------[ cut here ]------------
| [ 11.577806][ T255] WARNING: CPU: 2 PID: 255 at ./include/net/netdev_lock.h:52 __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
| [   11.578425][  T255] Modules linked in: netdevsim
| [   11.579059][  T255] Tainted: [W]=WARN
[   11.579346][  T255] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 11.579636][ T255] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
[ 11.579929][ T255] Code: 00 e8 b3 48 fe ff 48 8b 5c 24 58 e9 87 fb ff ff 49 8d bf 98 0c 00 00 be ff ff ff ff e8 b8 56 78 00 85 c0 0f 85 99 00 00 00 90 <0f> 0b 90 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 20 48 c1 ea 03
All code
========
   0:	00 e8                	add    %ch,%al
   2:	b3 48                	mov    $0x48,%bl
   4:	fe                   	(bad)
   5:	ff 48 8b             	decl   -0x75(%rax)
   8:	5c                   	pop    %rsp
   9:	24 58                	and    $0x58,%al
   b:	e9 87 fb ff ff       	jmp    0xfffffffffffffb97
  10:	49 8d bf 98 0c 00 00 	lea    0xc98(%r15),%rdi
  17:	be ff ff ff ff       	mov    $0xffffffff,%esi
  1c:	e8 b8 56 78 00       	call   0x7856d9
  21:	85 c0                	test   %eax,%eax
  23:	0f 85 99 00 00 00    	jne    0xc2
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  34:	fc ff df 
  37:	48 8b 54 24 20       	mov    0x20(%rsp),%rdx
  3c:	48 c1 ea 03          	shr    $0x3,%rdx

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   a:	fc ff df 
   d:	48 8b 54 24 20       	mov    0x20(%rsp),%rdx
  12:	48 c1 ea 03          	shr    $0x3,%rdx
[   11.580705][  T255] RSP: 0018:ffffc90000b271e8 EFLAGS: 00010246
[   11.581043][  T255] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   11.581362][  T255] RDX: 0000000000000000 RSI: ffff888005202c98 RDI: ffff888009818b00
[   11.581686][  T255] RBP: ffff888009558040 R08: 0000000000000000 R09: fffffbfff18fd844
[   11.582088][  T255] R10: ffffffff8c7ec227 R11: ffff888009818040 R12: 0000000000000000
[   11.582436][  T255] R13: ffff888005202128 R14: ffff888005202008 R15: ffff888005202000
[   11.582835][  T255] FS:  00007fd2c4b75800(0000) GS:ffff888036100000(0000) knlGS:0000000000000000
[   11.583258][  T255] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   11.583551][  T255] CR2: 00007fd2c4cb4440 CR3: 0000000004e66003 CR4: 0000000000772ef0
[   11.583877][  T255] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   11.584245][  T255] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   11.584628][  T255] PKRU: 55555554
[   11.584811][  T255] Call Trace:
[   11.584977][  T255]  <TASK>
[ 11.585090][ T255] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
[ 11.585377][ T255] ? __warn (kernel/panic.c:748) 
[ 11.585557][ T255] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
[ 11.585850][ T255] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 11.586131][ T255] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 11.586366][ T255] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 11.586685][ T255] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 11.587045][ T255] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
[ 11.587403][ T255] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10596) 
[ 11.587711][ T255] ? __pfx___netdev_update_features (net/core/dev.c:10589) 
[ 11.587985][ T255] ? _raw_spin_unlock_irq (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:97 ./include/linux/spinlock_api_smp.h:159 kernel/locking/spinlock.c:202) 
[ 11.588201][ T255] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 11.588470][ T255] register_netdevice (net/core/dev.c:11033) 
[ 11.588744][ T255] ? __pfx_register_netdevice (net/core/dev.c:10911) 
[ 11.589033][ T255] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 11.589325][ T255] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 11.589743][ T255] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 11.590198][ T255] ? nsim_dev_hwstats_init (./include/linux/workqueue.h:817 drivers/net/netdevsim/hwstats.c:442) netdevsim 
[ 11.590623][ T255] nsim_dev_reload_create (drivers/net/netdevsim/dev.c:1450 drivers/net/netdevsim/dev.c:1501) netdevsim 
[ 11.591098][ T255] ? __pfx_nsim_dev_reload_create (drivers/net/netdevsim/dev.c:1462) netdevsim 
[ 11.591543][ T255] ? devlink_params_driverinit_load_new (net/devlink/param.c:833 (discriminator 2)) 
[ 11.591936][ T255] devlink_reload (net/devlink/dev.c:474) 
[ 11.592212][ T255] ? __pfx_devlink_reload (net/devlink/dev.c:446) 
[ 11.592538][ T255] ? trace_cap_capable (./include/trace/events/capability.h:26 (discriminator 21)) 
[ 11.592881][ T255] ? cap_capable (security/commoncap.c:131) 
[ 11.593231][ T255] ? fdget (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1146 fs/file.c:1160) 
[ 11.593515][ T255] devlink_nl_reload_doit (net/devlink/dev.c:584) 
[ 11.593897][ T255] ? __pfx_devlink_nl_reload_doit (net/devlink/dev.c:520) 
[ 11.594336][ T255] ? __nla_parse (lib/nlattr.c:732) 
[ 11.594695][ T255] genl_family_rcv_msg_doit (net/netlink/genetlink.c:1115) 
[ 11.594914][ T255] ? __pfx_genl_family_rcv_msg_doit (net/netlink/genetlink.c:1088) 
[ 11.595182][ T255] ? cap_capable (security/commoncap.c:131) 
[ 11.595444][ T255] ? validate_chain (kernel/locking/lockdep.c:3799 kernel/locking/lockdep.c:3819 kernel/locking/lockdep.c:3874) 
[ 11.595683][ T255] genl_family_rcv_msg (net/netlink/genetlink.c:1195) 
[ 11.595908][ T255] ? __pfx_genl_family_rcv_msg (net/netlink/genetlink.c:1160) 
[ 11.596122][ T255] ? __pfx_devlink_nl_pre_doit_dev_lock (net/devlink/netlink.c:257) 
[ 11.596397][ T255] ? __pfx_devlink_nl_reload_doit (net/devlink/dev.c:520) 
[ 11.596646][ T255] ? __pfx_devlink_nl_post_doit_dev_lock (net/devlink/netlink.c:288) 
[ 11.596936][ T255] genl_rcv_msg (net/netlink/genetlink.c:65 net/netlink/genetlink.c:1211) 
[ 11.597144][ T255] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[ 11.597365][ T255] ? __pfx_genl_rcv_msg (net/netlink/genetlink.c:1201) 
[ 11.597582][ T255] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[ 11.597830][ T255] ? genl_rcv (net/netlink/genetlink.c:1219) 
[ 11.597997][ T255] ? __pfx_down_read (kernel/locking/rwsem.c:1522) 
[ 11.598225][ T255] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) 
[ 11.598480][ T255] genl_rcv (net/netlink/genetlink.c:1220) 
[ 11.598668][ T255] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[ 11.598888][ T255] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[ 11.599105][ T255] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 11.599339][ T255] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[ 11.599609][ T255] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[ 11.599832][ T255] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 11.600045][ T255] ? __might_fault (mm/memory.c:6851 mm/memory.c:6844) 
[ 11.600276][ T255] __sys_sendto (net/socket.c:709 net/socket.c:724 net/socket.c:2178) 
[ 11.600511][ T255] ? __pfx___sys_sendto (net/socket.c:2145) 
[ 11.600736][ T255] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 11.600948][ T255] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 21)) 
[ 11.601181][ T255] ? rseq_update_cpu_node_id (kernel/rseq.c:188 (discriminator 10)) 
[ 11.601447][ T255] ? __rseq_handle_notify_resume (kernel/rseq.c:420) 
[ 11.601775][ T255] ? rseq_update_cpu_node_id (kernel/rseq.c:188 (discriminator 10)) 
[ 11.602042][ T255] ? __pfx___rseq_handle_notify_resume (kernel/rseq.c:403) 
[ 11.602411][ T255] ? __pfx___x64_sys_openat (fs/open.c:1454) 
[ 11.602710][ T255] __x64_sys_sendto (net/socket.c:2181) 
[ 11.602958][ T255] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 11.603216][ T255] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 11.603473][ T255] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   11.603749][  T255] RIP: 0033:0x7fd2c4d81a4a
[ 11.604010][ T255] Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3 0f 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 15 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 7e c3 0f 1f 44 00 00 41 54 48 83 ec 30 44 89
All code
========
   0:	d8 64 89 02          	fsubs  0x2(%rcx,%rcx,4)
   4:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   b:	eb b8                	jmp    0xffffffffffffffc5
   d:	0f 1f 00             	nopl   (%rax)
  10:	f3 0f 1e fa          	endbr64
  14:	41 89 ca             	mov    %ecx,%r10d
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 15                	jne    0x38
  23:	b8 2c 00 00 00       	mov    $0x2c,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 7e                	ja     0xb0
  32:	c3                   	ret
  33:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  38:	41 54                	push   %r12
  3a:	48 83 ec 30          	sub    $0x30,%rsp
  3e:	44                   	rex.R
  3f:	89                   	.byte 0x89

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 7e                	ja     0x86
   8:	c3                   	ret
   9:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
   e:	41 54                	push   %r12
  10:	48 83 ec 30          	sub    $0x30,%rsp
  14:	44                   	rex.R
  15:	89                   	.byte 0x89
[   11.604883][  T255] RSP: 002b:00007ffe6961ea98 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[   11.605282][  T255] RAX: ffffffffffffffda RBX: 000000000e8f9b00 RCX: 00007fd2c4d81a4a
[   11.605671][  T255] RDX: 0000000000000040 RSI: 000000000e8f9b00 RDI: 0000000000000005
[   11.605986][  T255] RBP: 000000000e8f9910 R08: 00007fd2c4f25200 R09: 000000000000000c
[   11.606379][  T255] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000040f200
[   11.606720][  T255] R13: 000000000e8f9910 R14: 0000000000000000 R15: 0000000000000001
| [   38.229447][   T66] ------------[ cut here ]------------
| [ 38.229856][ T66] WARNING: CPU: 0 PID: 66 at ./include/net/netdev_lock.h:52 __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
| [   38.230246][   T66] Modules linked in: netdevsim
| [   38.230897][   T66] Tainted: [W]=WARN
[   38.231053][   T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   38.231280][   T66] Workqueue: netns cleanup_net
[ 38.231499][ T66] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
[ 38.231809][ T66] Code: 00 e8 b3 48 fe ff 48 8b 5c 24 58 e9 87 fb ff ff 49 8d bf 98 0c 00 00 be ff ff ff ff e8 b8 56 78 00 85 c0 0f 85 99 00 00 00 90 <0f> 0b 90 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 20 48 c1 ea 03
All code
========
   0:	00 e8                	add    %ch,%al
   2:	b3 48                	mov    $0x48,%bl
   4:	fe                   	(bad)
   5:	ff 48 8b             	decl   -0x75(%rax)
   8:	5c                   	pop    %rsp
   9:	24 58                	and    $0x58,%al
   b:	e9 87 fb ff ff       	jmp    0xfffffffffffffb97
  10:	49 8d bf 98 0c 00 00 	lea    0xc98(%r15),%rdi
  17:	be ff ff ff ff       	mov    $0xffffffff,%esi
  1c:	e8 b8 56 78 00       	call   0x7856d9
  21:	85 c0                	test   %eax,%eax
  23:	0f 85 99 00 00 00    	jne    0xc2
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  34:	fc ff df 
  37:	48 8b 54 24 20       	mov    0x20(%rsp),%rdx
  3c:	48 c1 ea 03          	shr    $0x3,%rdx

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   a:	fc ff df 
   d:	48 8b 54 24 20       	mov    0x20(%rsp),%rdx
  12:	48 c1 ea 03          	shr    $0x3,%rdx
[   38.232452][   T66] RSP: 0018:ffffc90000477620 EFLAGS: 00010246
[   38.232768][   T66] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   38.233048][   T66] RDX: 0000000000000000 RSI: ffff8880051fac98 RDI: ffff888005d750d0
[   38.233322][   T66] RBP: ffffffff8e924440 R08: 0000000000000000 R09: fffffbfff18fd844
[   38.233597][   T66] R10: ffffffff8c7ec227 R11: ffff888005d745c0 R12: 0000000000000000
[   38.234087][   T66] R13: ffff8880051fa128 R14: ffff8880051fa008 R15: ffff8880051fa000
[   38.234364][   T66] FS:  0000000000000000(0000) GS:ffff888036000000(0000) knlGS:0000000000000000
[   38.234753][   T66] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   38.234989][   T66] CR2: 00007f4b570562f0 CR3: 000000000aa86003 CR4: 0000000000772ef0
[   38.235270][   T66] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   38.235542][   T66] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   38.235833][   T66] PKRU: 55555554
[   38.235979][   T66] Call Trace:
[   38.236119][   T66]  <TASK>
[ 38.236217][ T66] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
[ 38.236408][ T66] ? __warn (kernel/panic.c:748) 
[ 38.236560][ T66] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
[ 38.236760][ T66] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 38.236960][ T66] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 38.237105][ T66] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 38.237296][ T66] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 38.237498][ T66] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
[ 38.237710][ T66] ? __pfx___netdev_update_features (net/core/dev.c:10589) 
[ 38.237953][ T66] ? _raw_spin_unlock_irq (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:97 ./include/linux/spinlock_api_smp.h:159 kernel/locking/spinlock.c:202) 
[ 38.238148][ T66] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 38.238342][ T66] register_netdevice (net/core/dev.c:11033) 
[ 38.238539][ T66] ? __pfx_register_netdevice (net/core/dev.c:10911) 
[ 38.238755][ T66] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 38.238961][ T66] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 38.239202][ T66] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 38.239455][ T66] ? nsim_dev_hwstats_init (./include/linux/workqueue.h:817 drivers/net/netdevsim/hwstats.c:442) netdevsim 
[ 38.239710][ T66] nsim_dev_reload_create (drivers/net/netdevsim/dev.c:1450 drivers/net/netdevsim/dev.c:1501) netdevsim 
[ 38.239955][ T66] ? __pfx_nsim_dev_reload_create (drivers/net/netdevsim/dev.c:1462) netdevsim 
[ 38.240240][ T66] ? devlink_params_driverinit_load_new (net/devlink/param.c:833 (discriminator 2)) 
[ 38.240487][ T66] devlink_reload (net/devlink/dev.c:474) 
[ 38.240688][ T66] ? __pfx_devlink_reload (net/devlink/dev.c:446) 
[ 38.240888][ T66] ? devlinks_xa_find_get (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/devlink/core.c:343) 
[ 38.241084][ T66] devlink_pernet_pre_exit (net/devlink/core.c:288 net/devlink/devl_internal.h:114 net/devlink/core.c:513) 
[ 38.241278][ T66] ? __pfx_devlink_pernet_pre_exit (net/devlink/core.c:496) 
[ 38.241525][ T66] cleanup_net (net/core/net_namespace.c:162 net/core/net_namespace.c:632) 
[ 38.241727][ T66] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 38.241922][ T66] ? __pfx_cleanup_net (net/core/net_namespace.c:594) 
[ 38.242110][ T66] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 21)) 
[ 38.242306][ T66] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 38.242491][ T66] ? process_one_work (kernel/workqueue.c:3214) 
[ 38.242699][ T66] process_one_work (kernel/workqueue.c:3238) 
[ 38.242901][ T66] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 38.243089][ T66] ? __pfx_process_one_work (kernel/workqueue.c:3140) 
[ 38.243284][ T66] ? assign_work (kernel/workqueue.c:1200) 
[ 38.243473][ T66] worker_thread (kernel/workqueue.c:3313 kernel/workqueue.c:3400) 
[ 38.243675][ T66] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 38.243915][ T66] ? __pfx_worker_thread (kernel/workqueue.c:3346) 
[ 38.244110][ T66] kthread (kernel/kthread.c:464) 
[ 38.244257][ T66] ? __pfx_kthread (kernel/kthread.c:413) 
[ 38.244452][ T66] ? __pfx_kthread (kernel/kthread.c:413) 
[ 38.244641][ T66] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 38.244839][ T66] ? __pfx_kthread (kernel/kthread.c:413) 


Finger prints:
__netdev_update_features:register_netdevice:nsim_create:__nsim_dev_port_add:nsim_dev_reload_create
__netdev_update_features:register_netdevice:nsim_create:__nsim_dev_port_add:nsim_dev_port_add_all