======================================
| 0
| xx__-> [    9.973954][  T251] ------------[ cut here ]------------
| [ 9.974387][ 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) 
| [    9.974912][  T251] Modules linked in: netdevsim psample
[    9.975564][  T251] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 9.975856][ T251] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 9.976141][ 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
[    9.976880][  T251] RSP: 0018:ffffc90000bf7528 EFLAGS: 00010246
[    9.977175][  T251] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[    9.977499][  T251] RDX: 0000000000000000 RSI: ffff888005372cd0 RDI: ffff88800cf250f8
[    9.977835][  T251] RBP: ffffffff8f053580 R08: 0000000000000000 R09: fffffbfff19c2504
[    9.978159][  T251] R10: ffffffff8ce12827 R11: ffff88800cf245c0 R12: 0000000000000000
[    9.978498][  T251] R13: ffff888005372130 R14: ffff888005372008 R15: ffff888005372000
[    9.978833][  T251] FS:  00007fa828c85740(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
[    9.979207][  T251] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.979487][  T251] CR2: 0000555a18b69f88 CR3: 000000000a1b4001 CR4: 0000000000772ef0
[    9.979817][  T251] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    9.980145][  T251] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    9.980463][  T251] PKRU: 55555554
[    9.980655][  T251] Call Trace:
[    9.980833][  T251]  <TASK>
[ 9.980958][ T251] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 9.981182][ T251] ? __warn (kernel/panic.c:748) 
[ 9.981357][ T251] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 9.981577][ T251] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 9.982152][ T251] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 9.982327][ T251] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 9.982547][ T251] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 9.982793][ T251] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 9.983014][ T251] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10566) 
[ 9.983239][ T251] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 9.983513][ 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) 
[ 9.983754][ T251] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 9.983977][ T251] register_netdevice (net/core/dev.c:11003) 
[ 9.984215][ T251] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 9.984431][ T251] ? __debugfs_create_file (fs/debugfs/inode.c:466) 
[ 9.984677][ T251] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 9.984911][ T251] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 9.985190][ T251] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 9.985361][ T251] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 9.985654][ T251] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 9.985930][ T251] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[ 9.986208][ T251] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[ 9.986435][ T251] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[ 9.986722][ T251] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[ 9.986941][ 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)) 
[ 9.987111][ T251] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[ 9.987337][ T251] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[ 9.987563][ T251] __driver_probe_device (drivers/base/dd.c:800) 
[ 9.987793][ T251] driver_probe_device (drivers/base/dd.c:830) 
[ 9.988014][ T251] __device_attach_driver (drivers/base/dd.c:959) 
[ 9.988237][ T251] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[ 9.988500][ T251] bus_for_each_drv (drivers/base/bus.c:462) 
[ 9.988729][ T251] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[ 9.988945][ T251] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 9.989162][ T251] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 9.989375][ T251] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 9.989605][ T251] __device_attach (drivers/base/dd.c:1030) 
[ 9.989836][ T251] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[ 9.990052][ T251] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 9.990268][ 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) 
[ 9.990492][ T251] bus_probe_device (drivers/base/bus.c:537) 
[ 9.990727][ T251] device_add (drivers/base/core.c:3672) 
[ 9.990963][ T251] ? __pfx_device_add (drivers/base/core.c:3548) 
[ 9.991177][ T251] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[ 9.991407][ T251] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[ 9.991697][ T251] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[ 9.991978][ T251] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 9.992191][ T251] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[ 9.992415][ T251] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 9.992640][ T251] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 9.992865][ T251] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[ 9.993045][ T251] ? __pfx_vfs_write (fs/read_write.c:660) 
[ 9.993266][ T251] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 9.993482][ 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) 
[ 9.993717][ T251] ? __pfx___up_read (kernel/locking/rwsem.c:1337) 
[ 9.993943][ T251] ksys_write (fs/read_write.c:731) 
[ 9.994111][ T251] ? __pfx_ksys_write (fs/read_write.c:721) 
[ 9.994327][ T251] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[ 9.994552][ T251] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 9.994788][ T251] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[    9.995051][  T251] RIP: 0033:0x7fa828dc6b77
[ 9.995277][ 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
[    9.995995][  T251] RSP: 002b:00007ffcb7a975c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[    9.996318][  T251] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007fa828dc6b77
[    9.996657][  T251] RDX: 0000000000000004 RSI: 0000555a18b68f80 RDI: 0000000000000001
[    9.996975][  T251] RBP: 0000555a18b68f80 R08: 0000000000000003 R09: 0000000000000000
[    9.997290][  T251] R10: 0000000000000020 R11: 0000000000000246 R12: 0000000000000004
[    9.997608][  T251] R13: 00007fa828e82760 R14: 0000000000000004 R15: 00007fa828e7d9c0
| [   10.031067][  T251] ------------[ cut here ]------------
| [ 10.031356][ T251] WARNING: CPU: 0 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) 
| [   10.031859][  T251] Modules linked in: netdevsim psample
| [   10.032483][  T251] Tainted: [W]=WARN
[   10.032673][  T251] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 10.032928][ T251] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.033188][ 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
[   10.033904][  T251] RSP: 0018:ffffc90000bf7528 EFLAGS: 00010246
[   10.034161][  T251] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   10.034464][  T251] RDX: 0000000000000000 RSI: ffff88800537acd0 RDI: ffff88800cf250f8
[   10.034801][  T251] RBP: ffffffff8f053580 R08: 0000000000000000 R09: fffffbfff19c2504
[   10.035106][  T251] R10: ffffffff8ce12827 R11: ffff88800cf245c0 R12: 0000000000000000
[   10.035411][  T251] R13: ffff88800537a130 R14: ffff88800537a008 R15: ffff88800537a000
[   10.035724][  T251] FS:  00007fa828c85740(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
[   10.036081][  T251] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   10.036336][  T251] CR2: 0000561365fbefe8 CR3: 000000000a1b4002 CR4: 0000000000772ef0
[   10.036647][  T251] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   10.036958][  T251] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   10.037253][  T251] PKRU: 55555554
[   10.037403][  T251] Call Trace:
[   10.037551][  T251]  <TASK>
[ 10.037662][ T251] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.037860][ T251] ? __warn (kernel/panic.c:748) 
[ 10.038014][ T251] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.038215][ T251] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 10.038416][ T251] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 10.038569][ T251] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 10.038795][ T251] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 10.039038][ T251] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.039243][ T251] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10566) 
[ 10.039457][ T251] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 10.039726][ 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) 
[ 10.039940][ T251] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 10.040163][ T251] register_netdevice (net/core/dev.c:11003) 
[ 10.040374][ T251] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 10.040572][ T251] ? __debugfs_create_file (fs/debugfs/inode.c:466) 
[ 10.040830][ T251] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 10.041051][ T251] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 10.041313][ T251] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 10.041473][ T251] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 10.041767][ T251] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 10.042034][ T251] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[ 10.042300][ T251] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[ 10.042521][ T251] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[ 10.042803][ T251] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[ 10.043014][ 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)) 
[ 10.043185][ T251] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[ 10.043401][ T251] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[ 10.043612][ T251] __driver_probe_device (drivers/base/dd.c:800) 
[ 10.043832][ T251] driver_probe_device (drivers/base/dd.c:830) 
[ 10.044046][ T251] __device_attach_driver (drivers/base/dd.c:959) 
[ 10.044255][ T251] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[ 10.044509][ T251] bus_for_each_drv (drivers/base/bus.c:462) 
[ 10.044731][ T251] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[ 10.044935][ T251] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 10.045139][ T251] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 10.045342][ T251] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 10.045555][ T251] __device_attach (drivers/base/dd.c:1030) 
[ 10.045768][ T251] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[ 10.045982][ T251] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 10.046190][ 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) 
[ 10.046405][ T251] bus_probe_device (drivers/base/bus.c:537) 
[ 10.046615][ T251] device_add (drivers/base/core.c:3672) 
[ 10.046846][ T251] ? __pfx_device_add (drivers/base/core.c:3548) 
[ 10.047055][ T251] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[ 10.047272][ T251] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[ 10.047544][ T251] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[ 10.047822][ T251] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 10.048026][ T251] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[ 10.048238][ T251] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 10.048442][ T251] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 10.048666][ T251] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[ 10.048830][ T251] ? __pfx_vfs_write (fs/read_write.c:660) 
[ 10.049048][ T251] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 10.049263][ T251] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 10.049483][ T251] ksys_write (fs/read_write.c:731) 
[ 10.049653][ T251] ? __pfx_ksys_write (fs/read_write.c:721) 
[ 10.049872][ T251] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 10.050079][ T251] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   10.050330][  T251] RIP: 0033:0x7fa828dc6b77
[ 10.050540][ T251] Code: Unable to access opcode bytes at 0x7fa828dc6b4d.

Code starting with the faulting instruction
===========================================
[   10.050839][  T251] RSP: 002b:00007ffcb7a975c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   10.051150][  T251] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007fa828dc6b77
[   10.051456][  T251] RDX: 0000000000000004 RSI: 0000555a18b68f80 RDI: 0000000000000001
[   10.051768][  T251] RBP: 0000555a18b68f80 R08: 0000000000000000 R09: 00007fa828e394e0
[   10.052081][  T251] R10: 00007fa828e393e0 R11: 0000000000000246 R12: 0000000000000004


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