======================================
| 0
| xx__-> [  247.269122][ T2802] ------------[ cut here ]------------
| [ 247.269582][ T2802] WARNING: CPU: 0 PID: 2802 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) 
| [  247.270202][ T2802] Modules linked in: netdevsim psample vxlan cls_matchall ip6_gre gre act_mirred act_tunnel_key cls_flower bareudp mpls_gso mpls_iptunnel mpls_router cls_bpf sch_ingress
[  247.271376][ T2802] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 247.271668][ T2802] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 247.271974][ T2802] Code: 00 e8 d3 48 fe ff 48 8b 5c 24 58 e9 87 fb ff ff 49 8d bf d0 0c 00 00 be ff ff ff ff e8 98 3b 99 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:	d3 48 fe             	rorl   %cl,-0x2(%rax)
   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 d0 0c 00 00 	lea    0xcd0(%r15),%rdi
  17:	be ff ff ff ff       	mov    $0xffffffff,%esi
  1c:	e8 98 3b 99 00       	call   0x993bb9
  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
[  247.272774][ T2802] RSP: 0018:ffffc90001947528 EFLAGS: 00010246
[  247.273083][ T2802] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[  247.273429][ T2802] RDX: 0000000000000000 RSI: ffff88800de22cd0 RDI: ffff888010cc0b78
[  247.273786][ T2802] RBP: ffffffff9ee53580 R08: 0000000000000000 R09: fffffbfff3982504
[  247.274139][ T2802] R10: ffffffff9cc12827 R11: ffff888010cc0040 R12: 0000000000000000
[  247.274491][ T2802] R13: ffff88800de22130 R14: ffff88800de22008 R15: ffff88800de22000
[  247.274842][ T2802] FS:  00007fb117ab8740(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
[  247.275251][ T2802] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  247.275541][ T2802] CR2: 00005626e2b7ef88 CR3: 000000000c3a0006 CR4: 0000000000772ef0
[  247.275889][ T2802] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  247.276249][ T2802] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  247.276590][ T2802] PKRU: 55555554
[  247.276769][ T2802] Call Trace:
[  247.276949][ T2802]  <TASK>
[ 247.277089][ T2802] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 247.277326][ T2802] ? __warn (kernel/panic.c:748) 
[ 247.277644][ T2802] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 247.277880][ T2802] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 247.278126][ T2802] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 247.278304][ T2802] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 247.278535][ T2802] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 247.278775][ T2802] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 247.279003][ T2802] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10566) 
[ 247.279242][ T2802] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 247.279529][ T2802] ? _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) 
[ 247.279759][ T2802] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 247.279997][ T2802] register_netdevice (net/core/dev.c:11003) 
[ 247.280252][ T2802] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 247.280475][ T2802] ? __debugfs_create_file (fs/debugfs/inode.c:466) 
[ 247.280716][ T2802] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 247.280958][ T2802] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 247.281260][ T2802] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 247.281438][ T2802] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 247.281735][ T2802] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 247.282029][ T2802] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[ 247.282334][ T2802] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[ 247.282578][ T2802] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[ 247.282865][ T2802] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[ 247.283104][ T2802] ? 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)) 
[ 247.283275][ T2802] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[ 247.283506][ T2802] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[ 247.283735][ T2802] __driver_probe_device (drivers/base/dd.c:800) 
[ 247.283960][ T2802] driver_probe_device (drivers/base/dd.c:830) 
[ 247.284200][ T2802] __device_attach_driver (drivers/base/dd.c:959) 
[ 247.284426][ T2802] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[ 247.284701][ T2802] bus_for_each_drv (drivers/base/bus.c:462) 
[ 247.284925][ T2802] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[ 247.285156][ T2802] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 247.285379][ T2802] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 247.285598][ T2802] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 247.285828][ T2802] __device_attach (drivers/base/dd.c:1030) 
[ 247.286059][ T2802] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[ 247.286279][ T2802] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 247.286499][ T2802] ? 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) 
[ 247.286728][ T2802] bus_probe_device (drivers/base/bus.c:537) 
[ 247.286953][ T2802] device_add (drivers/base/core.c:3672) 
[ 247.287187][ T2802] ? __pfx_device_add (drivers/base/core.c:3548) 
[ 247.287413][ T2802] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[ 247.287646][ T2802] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[ 247.287937][ T2802] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[ 247.288235][ T2802] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 247.288453][ T2802] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[ 247.288683][ T2802] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 247.288901][ T2802] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 247.289142][ T2802] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[ 247.289320][ T2802] ? __pfx_vfs_write (fs/read_write.c:660) 
[ 247.289548][ T2802] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 247.289767][ T2802] ? 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) 
[ 247.290002][ T2802] ? __pfx___up_read (kernel/locking/rwsem.c:1337) 
[ 247.290240][ T2802] ksys_write (fs/read_write.c:731) 
[ 247.290411][ T2802] ? __pfx_ksys_write (fs/read_write.c:721) 
[ 247.290642][ T2802] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[ 247.290876][ T2802] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 247.291110][ T2802] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  247.291383][ T2802] RIP: 0033:0x7fb117bf9b77
[ 247.291612][ T2802] 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
[  247.292398][ T2802] RSP: 002b:00007fff3d251418 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[  247.292734][ T2802] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007fb117bf9b77
[  247.293073][ T2802] RDX: 0000000000000004 RSI: 00005626e2b7df80 RDI: 0000000000000001
[  247.293405][ T2802] RBP: 00005626e2b7df80 R08: 0000000000000003 R09: 0000000000000000
[  247.293746][ T2802] R10: 0000000000000020 R11: 0000000000000246 R12: 0000000000000004
[  247.294087][ T2802] R13: 00007fb117cb5760 R14: 0000000000000004 R15: 00007fb117cb09c0
| [  247.314811][ T2802] ------------[ cut here ]------------
| [ 247.315240][ T2802] WARNING: CPU: 0 PID: 2802 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) 
| [  247.315691][ T2802] Modules linked in: netdevsim psample vxlan cls_matchall ip6_gre gre act_mirred act_tunnel_key cls_flower bareudp mpls_gso mpls_iptunnel mpls_router cls_bpf sch_ingress
| [  247.316870][ T2802] Tainted: [W]=WARN
[  247.317066][ T2802] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 247.317349][ T2802] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 247.317644][ T2802] Code: 00 e8 d3 48 fe ff 48 8b 5c 24 58 e9 87 fb ff ff 49 8d bf d0 0c 00 00 be ff ff ff ff e8 98 3b 99 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:	d3 48 fe             	rorl   %cl,-0x2(%rax)
   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 d0 0c 00 00 	lea    0xcd0(%r15),%rdi
  17:	be ff ff ff ff       	mov    $0xffffffff,%esi
  1c:	e8 98 3b 99 00       	call   0x993bb9
  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
[  247.318433][ T2802] RSP: 0018:ffffc90001947528 EFLAGS: 00010246
[  247.318715][ T2802] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[  247.319061][ T2802] RDX: 0000000000000000 RSI: ffff88800ae52cd0 RDI: ffff888010cc0b78
[  247.319395][ T2802] RBP: ffffffff9ee53580 R08: 0000000000000000 R09: fffffbfff3982504
[  247.319722][ T2802] R10: ffffffff9cc12827 R11: ffff888010cc0040 R12: 0000000000000000
[  247.320065][ T2802] R13: ffff88800ae52130 R14: ffff88800ae52008 R15: ffff88800ae52000
[  247.320401][ T2802] FS:  00007fb117ab8740(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
[  247.320785][ T2802] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  247.321073][ T2802] CR2: 00005626e2b7ef88 CR3: 000000000c3a0006 CR4: 0000000000772ef0
[  247.321555][ T2802] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  247.321893][ T2802] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  247.322230][ T2802] PKRU: 55555554
[  247.322399][ T2802] Call Trace:
[  247.322567][ T2802]  <TASK>
[ 247.322681][ T2802] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 247.322904][ T2802] ? __warn (kernel/panic.c:748) 
[ 247.323085][ T2802] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 247.323312][ T2802] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 247.323545][ T2802] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 247.323718][ T2802] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 247.323943][ T2802] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 247.324210][ T2802] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 247.324482][ T2802] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10566) 
[ 247.324713][ T2802] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 247.324997][ T2802] ? _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) 
[ 247.325240][ T2802] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 247.325471][ T2802] register_netdevice (net/core/dev.c:11003) 
[ 247.325710][ T2802] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 247.325931][ T2802] ? __debugfs_create_file (fs/debugfs/inode.c:466) 
[ 247.326177][ T2802] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 247.326413][ T2802] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 247.326702][ T2802] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 247.326877][ T2802] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 247.327180][ T2802] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 247.327468][ T2802] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[ 247.327755][ T2802] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[ 247.328302][ T2802] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[ 247.328591][ T2802] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[ 247.328952][ T2802] ? 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)) 
[ 247.329134][ T2802] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[ 247.329367][ T2802] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[ 247.329726][ T2802] __driver_probe_device (drivers/base/dd.c:800) 
[ 247.329952][ T2802] driver_probe_device (drivers/base/dd.c:830) 
[ 247.330325][ T2802] __device_attach_driver (drivers/base/dd.c:959) 
[ 247.330554][ T2802] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[ 247.330833][ T2802] bus_for_each_drv (drivers/base/bus.c:462) 
[ 247.331068][ T2802] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[ 247.331291][ T2802] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 247.331524][ T2802] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 247.331747][ T2802] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 247.332119][ T2802] __device_attach (drivers/base/dd.c:1030) 
[ 247.332350][ T2802] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[ 247.332573][ T2802] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 247.332928][ T2802] ? 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) 
[ 247.333168][ T2802] bus_probe_device (drivers/base/bus.c:537) 
[ 247.333396][ T2802] device_add (drivers/base/core.c:3672) 
[ 247.333626][ T2802] ? __pfx_device_add (drivers/base/core.c:3548) 
[ 247.333851][ T2802] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[ 247.334100][ T2802] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[ 247.334392][ T2802] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[ 247.334815][ T2802] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 247.335049][ T2802] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[ 247.335281][ T2802] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 247.335501][ T2802] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 247.335731][ T2802] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[ 247.335914][ T2802] ? __pfx_vfs_write (fs/read_write.c:660) 
[ 247.336154][ T2802] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 247.336387][ T2802] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 247.336619][ T2802] ksys_write (fs/read_write.c:731) 
[ 247.336928][ T2802] ? __pfx_ksys_write (fs/read_write.c:721) 
[ 247.337174][ T2802] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 247.337400][ T2802] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  247.337680][ T2802] RIP: 0033:0x7fb117bf9b77
[ 247.338063][ T2802] Code: Unable to access opcode bytes at 0x7fb117bf9b4d.

Code starting with the faulting instruction
===========================================
[  247.338348][ T2802] RSP: 002b:00007fff3d251418 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[  247.338677][ T2802] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007fb117bf9b77
[  247.339280][ T2802] RDX: 0000000000000004 RSI: 00005626e2b7df80 RDI: 0000000000000001
[  247.339620][ T2802] RBP: 00005626e2b7df80 R08: 0000000000000000 R09: 00007fb117c6c4e0
[  247.340102][ T2802] R10: 00007fb117c6c3e0 R11: 0000000000000246 R12: 0000000000000004


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