======================================
| 0
| xx__-> [   10.071886][  T251] ------------[ cut here ]------------
| [ 10.072347][ T251] WARNING: CPU: 2 PID: 251 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) 
| [   10.072832][  T251] Modules linked in: netdevsim psample
[   10.073535][  T251] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 10.073931][ T251] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.074264][ T251] 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
[   10.075066][  T251] RSP: 0018:ffffc90000bc7528 EFLAGS: 00010246
[   10.075375][  T251] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   10.075725][  T251] RDX: 0000000000000000 RSI: ffff888005c22cd0 RDI: ffff88800930ae38
[   10.076102][  T251] RBP: ffffffff9ec53580 R08: 0000000000000000 R09: fffffbfff3942504
[   10.076453][  T251] R10: ffffffff9ca12827 R11: ffff88800930a300 R12: 0000000000000000
[   10.076810][  T251] R13: ffff888005c22130 R14: ffff888005c22008 R15: ffff888005c22000
[   10.077196][  T251] FS:  00007f48d02f8740(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
[   10.077599][  T251] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   10.077897][  T251] CR2: 0000558cc53b3f88 CR3: 000000000b62a004 CR4: 0000000000772ef0
[   10.078275][  T251] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   10.078636][  T251] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   10.079002][  T251] PKRU: 55555554
[   10.079192][  T251] Call Trace:
[   10.079383][  T251]  <TASK>
[ 10.079521][ T251] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.079763][ T251] ? __warn (kernel/panic.c:748) 
[ 10.079957][ T251] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.080224][ T251] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 10.080472][ T251] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 10.080663][ T251] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 10.080907][ T251] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 10.081175][ T251] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.081415][ T251] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10566) 
[ 10.081659][ T251] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 10.081979][ T251] ? _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) 
[ 10.082227][ T251] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 10.082477][ T251] register_netdevice (net/core/dev.c:11003) 
[ 10.082732][ T251] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 10.082980][ T251] ? __debugfs_create_file (fs/debugfs/inode.c:466) 
[ 10.083240][ T251] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 10.083501][ T251] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 10.083805][ T251] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 10.084022][ T251] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 10.084334][ T251] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 10.084634][ T251] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[ 10.084939][ T251] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[ 10.085211][ T251] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[ 10.085512][ T251] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[ 10.085756][ T251] ? 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)) 
[ 10.085944][ T251] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[ 10.086207][ T251] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[ 10.086459][ T251] __driver_probe_device (drivers/base/dd.c:800) 
[ 10.086703][ T251] driver_probe_device (drivers/base/dd.c:830) 
[ 10.086950][ T251] __device_attach_driver (drivers/base/dd.c:959) 
[ 10.087203][ T251] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[ 10.087493][ T251] bus_for_each_drv (drivers/base/bus.c:462) 
[ 10.087733][ T251] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[ 10.087978][ T251] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 10.088217][ T251] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 10.088455][ T251] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 10.088705][ T251] __device_attach (drivers/base/dd.c:1030) 
[ 10.088946][ T251] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[ 10.089205][ T251] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 10.089444][ T251] ? 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) 
[ 10.089690][ T251] bus_probe_device (drivers/base/bus.c:537) 
[ 10.089931][ T251] device_add (drivers/base/core.c:3672) 
[ 10.090191][ T251] ? __pfx_device_add (drivers/base/core.c:3548) 
[ 10.090435][ T251] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[ 10.090686][ T251] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[ 10.091009][ T251] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[ 10.091313][ T251] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 10.091551][ T251] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[ 10.091800][ T251] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 10.092050][ T251] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 10.092299][ T251] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[ 10.092494][ T251] ? __pfx_vfs_write (fs/read_write.c:660) 
[ 10.092740][ T251] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 10.093003][ T251] ? 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) 
[ 10.093253][ T251] ? __pfx___up_read (kernel/locking/rwsem.c:1337) 
[ 10.093498][ T251] ksys_write (fs/read_write.c:731) 
[ 10.093685][ T251] ? __pfx_ksys_write (fs/read_write.c:721) 
[ 10.093921][ T251] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[ 10.094192][ T251] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 10.094434][ T251] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   10.094726][  T251] RIP: 0033:0x7f48d0439b77
[ 10.094984][ T251] 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
[   10.095768][  T251] RSP: 002b:00007ffdd73a98e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   10.096135][  T251] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f48d0439b77
[   10.096485][  T251] RDX: 0000000000000004 RSI: 0000558cc53b2f80 RDI: 0000000000000001
[   10.096834][  T251] RBP: 0000558cc53b2f80 R08: 0000000000000003 R09: 0000000000000000
[   10.097214][  T251] R10: 0000000000000020 R11: 0000000000000246 R12: 0000000000000004
[   10.097563][  T251] R13: 00007f48d04f5760 R14: 0000000000000004 R15: 00007f48d04f09c0
| [   10.118842][  T251] ------------[ cut here ]------------
| [ 10.119363][ T251] WARNING: CPU: 2 PID: 251 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) 
| [   10.119840][  T251] Modules linked in: netdevsim psample
| [   10.120626][  T251] Tainted: [W]=WARN
[   10.120836][  T251] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 10.121161][ T251] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.121478][ T251] 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
[   10.122286][  T251] RSP: 0018:ffffc90000bc7528 EFLAGS: 00010246
[   10.122596][  T251] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   10.122947][  T251] RDX: 0000000000000000 RSI: ffff888005c2acd0 RDI: ffff88800930ae38
[   10.123321][  T251] RBP: ffffffff9ec53580 R08: 0000000000000000 R09: fffffbfff3942504
[   10.123675][  T251] R10: ffffffff9ca12827 R11: ffff88800930a300 R12: 0000000000000000
[   10.124045][  T251] R13: ffff888005c2a130 R14: ffff888005c2a008 R15: ffff888005c2a000
[   10.124405][  T251] FS:  00007f48d02f8740(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
[   10.124807][  T251] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   10.125117][  T251] CR2: 0000558cc53b3f88 CR3: 000000000b62a004 CR4: 0000000000772ef0
[   10.125471][  T251] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   10.125825][  T251] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   10.126204][  T251] PKRU: 55555554
[   10.126394][  T251] Call Trace:
[   10.126595][  T251]  <TASK>
[ 10.126730][ T251] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.126988][ T251] ? __warn (kernel/panic.c:748) 
[ 10.127184][ T251] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.127423][ T251] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 10.127674][ T251] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 10.127860][ T251] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 10.128115][ T251] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 10.128374][ T251] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.128617][ T251] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10566) 
[ 10.128864][ T251] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 10.129177][ T251] ? _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) 
[ 10.129462][ T251] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 10.129709][ T251] register_netdevice (net/core/dev.c:11003) 
[ 10.129992][ T251] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 10.130234][ T251] ? __debugfs_create_file (fs/debugfs/inode.c:466) 
[ 10.130495][ T251] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 10.130760][ T251] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 10.131091][ T251] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 10.131289][ T251] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 10.131605][ T251] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 10.131923][ T251] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[ 10.132263][ T251] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[ 10.132526][ T251] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[ 10.132831][ T251] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[ 10.133096][ T251] ? 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)) 
[ 10.133296][ T251] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[ 10.133559][ T251] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[ 10.133808][ T251] __driver_probe_device (drivers/base/dd.c:800) 
[ 10.134077][ T251] driver_probe_device (drivers/base/dd.c:830) 
[ 10.134342][ T251] __device_attach_driver (drivers/base/dd.c:959) 
[ 10.134592][ T251] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[ 10.134894][ T251] bus_for_each_drv (drivers/base/bus.c:462) 
[ 10.135157][ T251] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[ 10.135402][ T251] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 10.135648][ T251] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 10.135889][ T251] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 10.136157][ T251] __device_attach (drivers/base/dd.c:1030) 
[ 10.136401][ T251] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[ 10.136646][ T251] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 10.136910][ T251] ? 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) 
[ 10.137172][ T251] bus_probe_device (drivers/base/bus.c:537) 
[ 10.137431][ T251] device_add (drivers/base/core.c:3672) 
[ 10.137684][ T251] ? __pfx_device_add (drivers/base/core.c:3548) 
[ 10.137928][ T251] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[ 10.138190][ T251] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[ 10.138495][ T251] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[ 10.138826][ T251] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 10.139081][ T251] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[ 10.139327][ T251] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 10.139560][ T251] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 10.139807][ T251] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[ 10.140019][ T251] ? __pfx_vfs_write (fs/read_write.c:660) 
[ 10.140270][ T251] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 10.140536][ T251] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 10.140790][ T251] ksys_write (fs/read_write.c:731) 
[ 10.141012][ T251] ? __pfx_ksys_write (fs/read_write.c:721) 
[ 10.141268][ T251] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 10.141520][ T251] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   10.141836][  T251] RIP: 0033:0x7f48d0439b77
[ 10.142108][ T251] Code: Unable to access opcode bytes at 0x7f48d0439b4d.

Code starting with the faulting instruction
===========================================
[   10.142417][  T251] RSP: 002b:00007ffdd73a98e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   10.142769][  T251] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f48d0439b77
[   10.143154][  T251] RDX: 0000000000000004 RSI: 0000558cc53b2f80 RDI: 0000000000000001
[   10.143509][  T251] RBP: 0000558cc53b2f80 R08: 0000000000000000 R09: 00007f48d04ac4e0
[   10.143875][  T251] R10: 00007f48d04ac3e0 R11: 0000000000000246 R12: 0000000000000004


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