======================================
| 0
| xx__-> [    9.904784][  T228] ------------[ cut here ]------------
| [ 9.905202][ T228] WARNING: CPU: 3 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:10566) 
| [    9.905629][  T228] Modules linked in: netdevsim
[    9.906334][  T228] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 9.906618][ T228] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 9.906890][ T228] Code: 00 e8 a3 4a 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 d8 33 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:	a3 4a fe ff 48 8b 5c 	movabs %eax,0x58245c8b48fffe4a
   9:	24 58 
   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 d8 33 78 00       	call   0x7833f9
  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
[    9.907634][  T228] RSP: 0018:ffffc90000b37520 EFLAGS: 00010246
[    9.907902][  T228] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[    9.908234][  T228] RDX: 0000000000000000 RSI: ffff8880050fac98 RDI: ffff88800b4450f8
[    9.908554][  T228] RBP: ffffffffa3123440 R08: 0000000000000000 R09: fffffbfff41fd83c
[    9.908868][  T228] R10: ffffffffa0fec1e7 R11: ffff88800b4445c0 R12: 0000000000000000
[    9.909200][  T228] R13: ffff8880050fa128 R14: ffff8880050fa008 R15: ffff8880050fa000
[    9.909518][  T228] FS:  00007efe52801740(0000) GS:ffff888036180000(0000) knlGS:0000000000000000
[    9.909883][  T228] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.910150][  T228] CR2: 0000558d9d5a74c8 CR3: 000000000520c002 CR4: 0000000000772ef0
[    9.910482][  T228] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    9.910796][  T228] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    9.911110][  T228] PKRU: 55555554
[    9.911283][  T228] Call Trace:
[    9.911447][  T228]  <TASK>
[ 9.911560][ T228] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 9.911774][ T228] ? __warn (kernel/panic.c:748) 
[ 9.911942][ T228] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 9.912153][ T228] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 9.912382][ T228] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 9.912543][ T228] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 9.912767][ T228] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 9.912992][ T228] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 9.913223][ T228] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 9.913489][ 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) 
[ 9.913702][ T228] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 9.913918][ T228] register_netdevice (net/core/dev.c:11003) 
[ 9.914140][ T228] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 9.914372][ T228] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 9.914597][ T228] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 9.914872][ T228] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 9.915037][ T228] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 9.915331][ T228] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 9.915611][ T228] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[ 9.915885][ T228] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[ 9.916116][ T228] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[ 9.916396][ T228] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[ 9.916616][ 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)) 
[ 9.916778][ T228] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[ 9.916998][ T228] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[ 9.917231][ T228] __driver_probe_device (drivers/base/dd.c:800) 
[ 9.917446][ T228] driver_probe_device (drivers/base/dd.c:830) 
[ 9.917658][ T228] __device_attach_driver (drivers/base/dd.c:959) 
[ 9.917871][ T228] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[ 9.918130][ T228] bus_for_each_drv (drivers/base/bus.c:462) 
[ 9.918352][ T228] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[ 9.918563][ T228] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 9.918775][ T228] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 9.918984][ T228] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 9.919209][ T228] __device_attach (drivers/base/dd.c:1030) 
[ 9.919422][ T228] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[ 9.919630][ T228] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 9.919844][ 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) 
[ 9.920063][ T228] bus_probe_device (drivers/base/bus.c:537) 
[ 9.920297][ T228] device_add (drivers/base/core.c:3672) 
[ 9.920515][ T228] ? __pfx_device_add (drivers/base/core.c:3548) 
[ 9.920726][ T228] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[ 9.920950][ T228] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[ 9.921234][ T228] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[ 9.921508][ T228] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 9.921717][ T228] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[ 9.921936][ T228] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 9.922145][ T228] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 9.922373][ T228] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[ 9.922542][ T228] ? __pfx_vfs_write (fs/read_write.c:660) 
[ 9.922774][ T228] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 9.922985][ 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) 
[ 9.923215][ T228] ? __pfx___up_read (kernel/locking/rwsem.c:1337) 
[ 9.923440][ T228] ksys_write (fs/read_write.c:731) 
[ 9.923601][ T228] ? __pfx_ksys_write (fs/read_write.c:721) 
[ 9.923809][ T228] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[ 9.924030][ T228] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 9.924255][ T228] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[    9.924513][  T228] RIP: 0033:0x7efe52942b77
[ 9.924732][ 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
[    9.925476][  T228] RSP: 002b:00007ffebf01ce08 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[    9.925805][  T228] RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 00007efe52942b77
[    9.926135][  T228] RDX: 0000000000000007 RSI: 0000558d9d5a64c0 RDI: 0000000000000001
[    9.926473][  T228] RBP: 0000558d9d5a64c0 R08: 0000000000000003 R09: 0000000000000077
[    9.926800][  T228] R10: 0000000000000063 R11: 0000000000000246 R12: 0000000000000007
[    9.927123][  T228] R13: 00007efe529fe760 R14: 0000000000000007 R15: 00007efe529f99c0
| [   10.166534][  T256] ------------[ cut here ]------------
| [ 10.166826][ T256] WARNING: CPU: 0 PID: 256 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:10566) 
| [   10.167233][  T256] Modules linked in: netdevsim
| [   10.167854][  T256] Tainted: [W]=WARN
[   10.168018][  T256] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 10.168273][ T256] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.168536][ T256] Code: 00 e8 a3 4a 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 d8 33 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:	a3 4a fe ff 48 8b 5c 	movabs %eax,0x58245c8b48fffe4a
   9:	24 58 
   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 d8 33 78 00       	call   0x7833f9
  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
[   10.169210][  T256] RSP: 0018:ffffc900005571e8 EFLAGS: 00010246
[   10.169454][  T256] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   10.169736][  T256] RDX: 0000000000000000 RSI: ffff8880091fac98 RDI: ffff888009b2d080
[   10.170022][  T256] RBP: ffff888009d10040 R08: 0000000000000000 R09: fffffbfff41fd83c
[   10.170323][  T256] R10: ffffffffa0fec1e7 R11: ffff888009b2c5c0 R12: 0000000000000000
[   10.170610][  T256] R13: ffff8880091fa128 R14: ffff8880091fa008 R15: ffff8880091fa000
[   10.170894][  T256] FS:  00007fb29efda800(0000) GS:ffff888036000000(0000) knlGS:0000000000000000
[   10.171236][  T256] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   10.171474][  T256] CR2: 00007fb29f119440 CR3: 00000000024e8003 CR4: 0000000000772ef0
[   10.171769][  T256] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   10.172064][  T256] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   10.172371][  T256] PKRU: 55555554
[   10.172522][  T256] Call Trace:
[   10.172677][  T256]  <TASK>
[ 10.172781][ T256] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.172986][ T256] ? __warn (kernel/panic.c:748) 
[ 10.173141][ T256] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.173356][ T256] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 10.173558][ T256] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 10.173709][ T256] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 10.173903][ T256] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 10.174109][ T256] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.174318][ T256] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10566) 
[ 10.174522][ T256] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 10.174770][ T256] ? _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) 
[ 10.174970][ T256] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 10.175189][ T256] register_netdevice (net/core/dev.c:11003) 
[ 10.175391][ T256] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 10.175602][ T256] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 10.175818][ T256] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 10.176071][ T256] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 10.176347][ T256] ? nsim_dev_hwstats_init (./include/linux/workqueue.h:817 drivers/net/netdevsim/hwstats.c:442) netdevsim 
[ 10.176607][ T256] nsim_dev_reload_create (drivers/net/netdevsim/dev.c:1450 drivers/net/netdevsim/dev.c:1501) netdevsim 
[ 10.176855][ T256] ? __pfx_nsim_dev_reload_create (drivers/net/netdevsim/dev.c:1462) netdevsim 
[ 10.177100][ T256] ? devlink_params_driverinit_load_new (net/devlink/param.c:833 (discriminator 2)) 
[ 10.177371][ T256] devlink_reload (net/devlink/dev.c:474) 
[ 10.177571][ T256] ? __pfx_devlink_reload (net/devlink/dev.c:446) 
[ 10.177766][ T256] ? trace_cap_capable (./include/trace/events/capability.h:26 (discriminator 21)) 
[ 10.177967][ T256] ? cap_capable (security/commoncap.c:131) 
[ 10.178158][ T256] ? fdget (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1146 fs/file.c:1160) 
[ 10.178325][ T256] devlink_nl_reload_doit (net/devlink/dev.c:584) 
[ 10.178527][ T256] ? __pfx_devlink_nl_reload_doit (net/devlink/dev.c:520) 
[ 10.178773][ T256] ? __nla_parse (lib/nlattr.c:732) 
[ 10.178980][ T256] genl_family_rcv_msg_doit (net/netlink/genetlink.c:1115) 
[ 10.179189][ T256] ? __pfx_genl_family_rcv_msg_doit (net/netlink/genetlink.c:1088) 
[ 10.179441][ T256] ? cap_capable (security/commoncap.c:131) 
[ 10.179634][ T256] ? validate_chain (kernel/locking/lockdep.c:3799 kernel/locking/lockdep.c:3819 kernel/locking/lockdep.c:3874) 
[ 10.179837][ T256] genl_family_rcv_msg (net/netlink/genetlink.c:1195) 
[ 10.180039][ T256] ? __pfx_genl_family_rcv_msg (net/netlink/genetlink.c:1160) 
[ 10.180247][ T256] ? __pfx_devlink_nl_pre_doit_dev_lock (net/devlink/netlink.c:257) 
[ 10.180485][ T256] ? __pfx_devlink_nl_reload_doit (net/devlink/dev.c:520) 
[ 10.180725][ T256] ? __pfx_devlink_nl_post_doit_dev_lock (net/devlink/netlink.c:288) 
[ 10.180979][ T256] genl_rcv_msg (net/netlink/genetlink.c:65 net/netlink/genetlink.c:1211) 
[ 10.181190][ T256] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[ 10.181381][ T256] ? __pfx_genl_rcv_msg (net/netlink/genetlink.c:1201) 
[ 10.181581][ T256] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[ 10.181788][ T256] ? genl_rcv (net/netlink/genetlink.c:1219) 
[ 10.181934][ T256] ? __pfx_down_read (kernel/locking/rwsem.c:1522) 
[ 10.182129][ T256] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) 
[ 10.182340][ T256] genl_rcv (net/netlink/genetlink.c:1220) 
[ 10.182490][ T256] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[ 10.182694][ T256] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[ 10.182895][ T256] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 10.183094][ T256] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[ 10.183307][ T256] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[ 10.183497][ T256] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 10.183693][ T256] ? __might_fault (mm/memory.c:6851 mm/memory.c:6844) 
[ 10.183899][ T256] __sys_sendto (net/socket.c:709 net/socket.c:724 net/socket.c:2178) 
[ 10.184098][ T256] ? __pfx___sys_sendto (net/socket.c:2145) 
[ 10.184302][ T256] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 10.184500][ T256] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 21)) 
[ 10.184706][ T256] ? rseq_update_cpu_node_id (kernel/rseq.c:188 (discriminator 10)) 
[ 10.184906][ T256] ? __rseq_handle_notify_resume (kernel/rseq.c:420) 
[ 10.185145][ T256] ? rseq_update_cpu_node_id (kernel/rseq.c:188 (discriminator 10)) 
[ 10.185357][ T256] ? __pfx___rseq_handle_notify_resume (kernel/rseq.c:403) 
[ 10.185603][ T256] ? __pfx___x64_sys_openat (fs/open.c:1454) 
[ 10.185809][ T256] __x64_sys_sendto (net/socket.c:2181) 
[ 10.186006][ T256] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 10.186261][ T256] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 10.186458][ T256] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   10.186695][  T256] RIP: 0033:0x7fb29f1e6a4a
[ 10.186895][ T256] 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
[   10.187581][  T256] RSP: 002b:00007ffd4ff467c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[   10.187874][  T256] RAX: ffffffffffffffda RBX: 000000002313db00 RCX: 00007fb29f1e6a4a
[   10.188159][  T256] RDX: 0000000000000040 RSI: 000000002313db00 RDI: 0000000000000005
[   10.188629][  T256] RBP: 000000002313d910 R08: 00007fb29f38a200 R09: 000000000000000c
[   10.188925][  T256] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000040f200
[   10.189225][  T256] R13: 000000002313d910 R14: 0000000000000000 R15: 0000000000000001
| [   36.510284][   T68] ------------[ cut here ]------------
| [ 36.510562][ T68] WARNING: CPU: 3 PID: 68 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:10566) 
| [   36.510916][   T68] Modules linked in: netdevsim
| [   36.511541][   T68] Tainted: [W]=WARN
[   36.511689][   T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   36.511916][   T68] Workqueue: netns cleanup_net
[ 36.512113][ T68] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 36.512428][ T68] Code: 00 e8 a3 4a 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 d8 33 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:	a3 4a fe ff 48 8b 5c 	movabs %eax,0x58245c8b48fffe4a
   9:	24 58 
   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 d8 33 78 00       	call   0x7833f9
  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
[   36.513047][   T68] RSP: 0018:ffffc90000497620 EFLAGS: 00010246
[   36.513343][   T68] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   36.513611][   T68] RDX: 0000000000000000 RSI: ffff8880097d2c98 RDI: ffff888009012e10
[   36.513869][   T68] RBP: ffffffffa3123440 R08: 0000000000000000 R09: fffffbfff41fd83c
[   36.514130][   T68] R10: ffffffffa0fec1e7 R11: ffff888009012300 R12: 0000000000000000
[   36.514469][   T68] R13: ffff8880097d2128 R14: ffff8880097d2008 R15: ffff8880097d2000
[   36.514737][   T68] FS:  0000000000000000(0000) GS:ffff888036180000(0000) knlGS:0000000000000000
[   36.515047][   T68] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   36.515428][   T68] CR2: 00007f38e22a0000 CR3: 0000000015f28006 CR4: 0000000000772ef0
[   36.515701][   T68] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   36.515971][   T68] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   36.516250][   T68] PKRU: 55555554
[   36.516393][   T68] Call Trace:
[   36.516532][   T68]  <TASK>
[ 36.516628][ T68] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 36.516810][ T68] ? __warn (kernel/panic.c:748) 
[ 36.516953][ T68] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 36.517133][ T68] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 36.517335][ T68] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 36.517478][ T68] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 36.517659][ T68] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 36.517854][ T68] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 36.518043][ T68] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 36.518288][ T68] ? _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) 
[ 36.518475][ T68] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 36.518658][ T68] register_netdevice (net/core/dev.c:11003) 
[ 36.518842][ T68] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 36.519035][ T68] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 36.519246][ T68] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 36.519485][ T68] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 36.519728][ T68] ? nsim_dev_hwstats_init (./include/linux/workqueue.h:817 drivers/net/netdevsim/hwstats.c:442) netdevsim 
[ 36.519967][ T68] nsim_dev_reload_create (drivers/net/netdevsim/dev.c:1450 drivers/net/netdevsim/dev.c:1501) netdevsim 
[ 36.520234][ T68] ? __pfx_nsim_dev_reload_create (drivers/net/netdevsim/dev.c:1462) netdevsim 
[ 36.520487][ T68] ? devlink_params_driverinit_load_new (net/devlink/param.c:833 (discriminator 2)) 
[ 36.520742][ T68] devlink_reload (net/devlink/dev.c:474) 
[ 36.520926][ T68] ? __pfx_devlink_reload (net/devlink/dev.c:446) 
[ 36.521114][ T68] ? devlinks_xa_find_get (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/devlink/core.c:343) 
[ 36.521316][ T68] devlink_pernet_pre_exit (net/devlink/core.c:288 net/devlink/devl_internal.h:114 net/devlink/core.c:513) 
[ 36.521496][ T68] ? __pfx_devlink_pernet_pre_exit (net/devlink/core.c:496) 
[ 36.521730][ T68] cleanup_net (net/core/net_namespace.c:162 net/core/net_namespace.c:632) 
[ 36.521913][ T68] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 36.522093][ T68] ? __pfx_cleanup_net (net/core/net_namespace.c:594) 
[ 36.522284][ T68] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 21)) 
[ 36.522475][ T68] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 36.522662][ T68] ? process_one_work (kernel/workqueue.c:3214) 
[ 36.522851][ T68] process_one_work (kernel/workqueue.c:3238) 
[ 36.523040][ T68] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 36.523238][ T68] ? __pfx_process_one_work (kernel/workqueue.c:3140) 
[ 36.523434][ T68] ? assign_work (kernel/workqueue.c:1200) 
[ 36.523621][ T68] worker_thread (kernel/workqueue.c:3313 kernel/workqueue.c:3400) 
[ 36.523805][ T68] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 36.524038][ T68] ? __pfx_worker_thread (kernel/workqueue.c:3346) 
[ 36.524228][ T68] kthread (kernel/kthread.c:464) 
[ 36.524372][ T68] ? __pfx_kthread (kernel/kthread.c:413) 
[ 36.524562][ T68] ? __pfx_kthread (kernel/kthread.c:413) 
[ 36.524747][ T68] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 36.524927][ T68] ? __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