======================================
| 0
| xx__-> [   10.322305][  T250] ------------[ cut here ]------------
| [ 10.322662][ T250] WARNING: CPU: 0 PID: 250 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) 
| [   10.323116][  T250] Modules linked in: netdevsim psample
[   10.323717][  T250] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 10.324089][ T250] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.324367][ T250] 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
[   10.325124][  T250] RSP: 0018:ffffc90000837528 EFLAGS: 00010246
[   10.325398][  T250] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   10.325715][  T250] RDX: 0000000000000000 RSI: ffff888005ba2cd0 RDI: ffff8880150fd0f8
[   10.326079][  T250] RBP: ffffffff9e053580 R08: 0000000000000000 R09: fffffbfff37c2504
[   10.326400][  T250] R10: ffffffff9be12827 R11: ffff8880150fc5c0 R12: 0000000000000000
[   10.326715][  T250] R13: ffff888005ba2130 R14: ffff888005ba2008 R15: ffff888005ba2000
[   10.327044][  T250] FS:  00007f54c7aa5740(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
[   10.327416][  T250] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   10.327682][  T250] CR2: 0000559b24456178 CR3: 0000000015526004 CR4: 0000000000772ef0
[   10.328007][  T250] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   10.328320][  T250] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   10.328632][  T250] PKRU: 55555554
[   10.328798][  T250] Call Trace:
[   10.328973][  T250]  <TASK>
[ 10.329085][ T250] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.329301][ T250] ? __warn (kernel/panic.c:748) 
[ 10.329461][ T250] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.329670][ T250] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 10.329884][ T250] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 10.330069][ T250] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 10.330285][ T250] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 10.330513][ T250] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.330724][ T250] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10566) 
[ 10.331009][ T250] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 10.331289][ T250] ? _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) 
[ 10.331506][ T250] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 10.331724][ T250] register_netdevice (net/core/dev.c:11003) 
[ 10.331961][ T250] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 10.332185][ T250] ? __debugfs_create_file (fs/debugfs/inode.c:466) 
[ 10.332409][ T250] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 10.332633][ T250] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 10.332903][ T250] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 10.333079][ T250] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 10.333357][ T250] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 10.333629][ T250] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[ 10.333898][ T250] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[ 10.334145][ T250] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[ 10.334412][ T250] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[ 10.334624][ T250] ? 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)) 
[ 10.334783][ T250] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[ 10.335019][ T250] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[ 10.335238][ T250] __driver_probe_device (drivers/base/dd.c:800) 
[ 10.335451][ T250] driver_probe_device (drivers/base/dd.c:830) 
[ 10.335661][ T250] __device_attach_driver (drivers/base/dd.c:959) 
[ 10.335873][ T250] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[ 10.336146][ T250] bus_for_each_drv (drivers/base/bus.c:462) 
[ 10.336360][ T250] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[ 10.336573][ T250] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 10.336782][ T250] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 10.337004][ T250] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 10.337219][ T250] __device_attach (drivers/base/dd.c:1030) 
[ 10.337429][ T250] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[ 10.337637][ T250] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 10.337844][ T250] ? 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) 
[ 10.338089][ T250] bus_probe_device (drivers/base/bus.c:537) 
[ 10.338303][ T250] device_add (drivers/base/core.c:3672) 
[ 10.338517][ T250] ? __pfx_device_add (drivers/base/core.c:3548) 
[ 10.338725][ T250] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[ 10.338957][ T250] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[ 10.339232][ T250] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[ 10.339511][ T250] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 10.339723][ T250] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[ 10.339952][ T250] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 10.340162][ T250] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 10.340377][ T250] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[ 10.340544][ T250] ? __pfx_vfs_write (fs/read_write.c:660) 
[ 10.340758][ T250] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 10.340977][ T250] ? 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) 
[ 10.341201][ T250] ? __pfx___up_read (kernel/locking/rwsem.c:1337) 
[ 10.341419][ T250] ksys_write (fs/read_write.c:731) 
[ 10.341580][ T250] ? __pfx_ksys_write (fs/read_write.c:721) 
[ 10.341788][ T250] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[ 10.342029][ T250] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 10.342272][ T250] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   10.342530][  T250] RIP: 0033:0x7f54c7be6b77
[ 10.342753][ T250] 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
[   10.343479][  T250] RSP: 002b:00007ffe801f7d78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   10.343798][  T250] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f54c7be6b77
[   10.344126][  T250] RDX: 0000000000000004 RSI: 000055f93cd0bf80 RDI: 0000000000000001
[   10.344442][  T250] RBP: 000055f93cd0bf80 R08: 0000000000000003 R09: 0000000000000000
[   10.344753][  T250] R10: 0000000000000020 R11: 0000000000000246 R12: 0000000000000004
[   10.345075][  T250] R13: 00007f54c7ca2760 R14: 0000000000000004 R15: 00007f54c7c9d9c0
| [   10.375306][  T250] ------------[ cut here ]------------
| [ 10.375859][ T250] WARNING: CPU: 2 PID: 250 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) 
| [   10.376378][  T250] Modules linked in: netdevsim psample
| [   10.377087][  T250] Tainted: [W]=WARN
[   10.377297][  T250] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 10.377584][ T250] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.377880][ T250] 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
[   10.378670][  T250] RSP: 0018:ffffc90000837528 EFLAGS: 00010246
[   10.378978][  T250] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   10.379329][  T250] RDX: 0000000000000000 RSI: ffff888005baacd0 RDI: ffff8880150fd0f8
[   10.379677][  T250] RBP: ffffffff9e053580 R08: 0000000000000000 R09: fffffbfff37c2504
[   10.380029][  T250] R10: ffffffff9be12827 R11: ffff8880150fc5c0 R12: 0000000000000000
[   10.380363][  T250] R13: ffff888005baa130 R14: ffff888005baa008 R15: ffff888005baa000
[   10.380704][  T250] FS:  00007f54c7aa5740(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
[   10.381110][  T250] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   10.381392][  T250] CR2: 0000559b244183b8 CR3: 0000000015526006 CR4: 0000000000772ef0
[   10.381754][  T250] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   10.382125][  T250] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   10.382477][  T250] PKRU: 55555554
[   10.382664][  T250] Call Trace:
[   10.382849][  T250]  <TASK>
[ 10.382989][ T250] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.383228][ T250] ? __warn (kernel/panic.c:748) 
[ 10.383419][ T250] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.383658][ T250] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 10.383910][ T250] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 10.384111][ T250] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 10.384359][ T250] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 10.384609][ T250] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.384844][ T250] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10566) 
[ 10.385093][ T250] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 10.385385][ T250] ? _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) 
[ 10.385632][ T250] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 10.385871][ T250] register_netdevice (net/core/dev.c:11003) 
[ 10.386118][ T250] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 10.386348][ T250] ? __debugfs_create_file (fs/debugfs/inode.c:466) 
[ 10.386612][ T250] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 10.386869][ T250] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 10.387184][ T250] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 10.387373][ T250] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 10.387678][ T250] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 10.387994][ T250] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[ 10.388292][ T250] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[ 10.388536][ T250] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[ 10.388830][ T250] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[ 10.389086][ T250] ? 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)) 
[ 10.389285][ T250] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[ 10.389539][ T250] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[ 10.389790][ T250] __driver_probe_device (drivers/base/dd.c:800) 
[ 10.390040][ T250] driver_probe_device (drivers/base/dd.c:830) 
[ 10.390286][ T250] __device_attach_driver (drivers/base/dd.c:959) 
[ 10.390532][ T250] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[ 10.390829][ T250] bus_for_each_drv (drivers/base/bus.c:462) 
[ 10.391086][ T250] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[ 10.391323][ T250] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 10.391570][ T250] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 10.391804][ T250] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 10.392059][ T250] __device_attach (drivers/base/dd.c:1030) 
[ 10.392320][ T250] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[ 10.392569][ T250] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 10.392813][ T250] ? 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) 
[ 10.393075][ T250] bus_probe_device (drivers/base/bus.c:537) 
[ 10.393324][ T250] device_add (drivers/base/core.c:3672) 
[ 10.393586][ T250] ? __pfx_device_add (drivers/base/core.c:3548) 
[ 10.393823][ T250] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[ 10.394109][ T250] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[ 10.394420][ T250] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[ 10.394736][ T250] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 10.394983][ T250] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[ 10.395230][ T250] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 10.395469][ T250] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 10.395723][ T250] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[ 10.395920][ T250] ? __pfx_vfs_write (fs/read_write.c:660) 
[ 10.396178][ T250] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 10.396420][ T250] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 10.396676][ T250] ksys_write (fs/read_write.c:731) 
[ 10.396856][ T250] ? __pfx_ksys_write (fs/read_write.c:721) 
[ 10.397110][ T250] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 10.397355][ T250] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   10.397658][  T250] RIP: 0033:0x7f54c7be6b77
[ 10.397903][ T250] Code: Unable to access opcode bytes at 0x7f54c7be6b4d.

Code starting with the faulting instruction
===========================================
[   10.398209][  T250] RSP: 002b:00007ffe801f7d78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   10.398558][  T250] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f54c7be6b77
[   10.398915][  T250] RDX: 0000000000000004 RSI: 000055f93cd0bf80 RDI: 0000000000000001
[   10.399277][  T250] RBP: 000055f93cd0bf80 R08: 0000000000000000 R09: 00007f54c7c594e0
[   10.399619][  T250] R10: 00007f54c7c593e0 R11: 0000000000000246 R12: 0000000000000004


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