======================================
| 0
| xx__-> [   35.334369][  T708] ------------[ cut here ]------------
| [ 35.334846][ T708] WARNING: CPU: 2 PID: 708 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) 
| [   35.335322][  T708] Modules linked in: netdevsim psample unix_diag sctp
[   35.335988][  T708] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 35.336281][ T708] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 35.336586][ T708] 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
[   35.337406][  T708] RSP: 0018:ffffc90000657528 EFLAGS: 00010246
[   35.337698][  T708] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   35.338058][  T708] RDX: 0000000000000000 RSI: ffff888005beacd0 RDI: ffff88800e9550f8
[   35.338398][  T708] RBP: ffffffff95c53580 R08: 0000000000000000 R09: fffffbfff2742504
[   35.338736][  T708] R10: ffffffff93a12827 R11: ffff88800e9545c0 R12: 0000000000000000
[   35.339089][  T708] R13: ffff888005bea130 R14: ffff888005bea008 R15: ffff888005bea000
[   35.339433][  T708] FS:  00007f761b4041c0(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
[   35.339825][  T708] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   35.340128][  T708] CR2: 00007f760dce7bc0 CR3: 000000000c01e002 CR4: 0000000000772ef0
[   35.340466][  T708] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   35.340804][  T708] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   35.341161][  T708] PKRU: 55555554
[   35.341344][  T708] Call Trace:
[   35.341525][  T708]  <TASK>
[ 35.341657][ T708] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 35.342012][ T708] ? __warn (kernel/panic.c:748) 
[ 35.342202][ T708] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 35.342437][ T708] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 35.342676][ T708] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 35.342861][ T708] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 35.343110][ T708] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 35.343358][ T708] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 35.343589][ T708] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10566) 
[ 35.343827][ T708] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 35.344127][ T708] ? _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) 
[ 35.344364][ T708] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 35.344605][ T708] register_netdevice (net/core/dev.c:11003) 
[ 35.344874][ T708] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 35.345116][ T708] ? __debugfs_create_file (fs/debugfs/inode.c:466) 
[ 35.345366][ T708] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 35.345611][ T708] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 35.345904][ T708] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 35.346112][ T708] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 35.346416][ T708] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 35.346707][ T708] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[ 35.347015][ T708] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[ 35.347260][ T708] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[ 35.347556][ T708] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[ 35.347795][ T708] ? 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)) 
[ 35.347989][ T708] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[ 35.348230][ T708] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[ 35.348474][ T708] __driver_probe_device (drivers/base/dd.c:800) 
[ 35.348707][ T708] driver_probe_device (drivers/base/dd.c:830) 
[ 35.348954][ T708] __device_attach_driver (drivers/base/dd.c:959) 
[ 35.349189][ T708] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[ 35.349473][ T708] bus_for_each_drv (drivers/base/bus.c:462) 
[ 35.349706][ T708] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[ 35.349936][ T708] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 35.350183][ T708] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 35.350414][ T708] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 35.350653][ T708] __device_attach (drivers/base/dd.c:1030) 
[ 35.350886][ T708] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[ 35.351135][ T708] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 35.351368][ T708] ? 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) 
[ 35.351609][ T708] bus_probe_device (drivers/base/bus.c:537) 
[ 35.351845][ T708] device_add (drivers/base/core.c:3672) 
[ 35.352102][ T708] ? __pfx_device_add (drivers/base/core.c:3548) 
[ 35.352335][ T708] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[ 35.352580][ T708] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[ 35.352883][ T708] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[ 35.353197][ T708] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 35.353426][ T708] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[ 35.353667][ T708] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 35.353895][ T708] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 35.354146][ T708] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[ 35.354334][ T708] ? __pfx_vfs_write (fs/read_write.c:660) 
[ 35.354577][ T708] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 35.354807][ T708] ? 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) 
[ 35.355062][ T708] ? __pfx___up_read (kernel/locking/rwsem.c:1337) 
[ 35.355302][ T708] ksys_write (fs/read_write.c:731) 
[ 35.355482][ T708] ? __pfx_ksys_write (fs/read_write.c:721) 
[ 35.355712][ T708] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[ 35.355966][ T708] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 35.356211][ T708] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   35.356494][  T708] RIP: 0033:0x7f761b61eb77
[ 35.356737][ T708] 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
[   35.357511][  T708] RSP: 002b:00007ffe3a014148 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   35.357855][  T708] RAX: ffffffffffffffda RBX: 00007f761b404140 RCX: 00007f761b61eb77
[   35.358208][  T708] RDX: 0000000000000009 RSI: 000055e3fff94d20 RDI: 0000000000000006
[   35.358550][  T708] RBP: 0000000000000009 R08: 0000000000000000 R09: 0000000000000000
[   35.358885][  T708] R10: 0000000000000002 R11: 0000000000000246 R12: 00007f760d3414c0
[   35.359239][  T708] R13: 000055e3fff94d20 R14: 0000000000000006 R15: 000055e3ffd6f900
| [   38.488118][  T708] ------------[ cut here ]------------
| [ 38.488575][ T708] WARNING: CPU: 2 PID: 708 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) 
| [   38.489044][  T708] Modules linked in: netdevsim psample unix_diag sctp
| [   38.489907][  T708] Tainted: [W]=WARN
[   38.490120][  T708] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 38.490411][ T708] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 38.490856][ T708] 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
[   38.491764][  T708] RSP: 0018:ffffc90000657528 EFLAGS: 00010246
[   38.492071][  T708] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   38.492410][  T708] RDX: 0000000000000000 RSI: ffff888005be2cd0 RDI: ffff88800e9550f8
[   38.492879][  T708] RBP: ffffffff95c53580 R08: 0000000000000000 R09: fffffbfff2742504
[   38.493233][  T708] R10: ffffffff93a12827 R11: ffff88800e9545c0 R12: 0000000000000000
[   38.493571][  T708] R13: ffff888005be2130 R14: ffff888005be2008 R15: ffff888005be2000
[   38.494056][  T708] FS:  00007f761b4041c0(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
[   38.494450][  T708] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   38.494734][  T708] CR2: 000055e852cf2a91 CR3: 000000000c01e002 CR4: 0000000000772ef0
[   38.495209][  T708] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   38.495541][  T708] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   38.496025][  T708] PKRU: 55555554
[   38.496206][  T708] Call Trace:
[   38.496386][  T708]  <TASK>
[ 38.496512][ T708] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 38.496743][ T708] ? __warn (kernel/panic.c:748) 
[ 38.496922][ T708] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 38.497174][ T708] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 38.497414][ T708] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 38.497594][ T708] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 38.497827][ T708] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 38.498215][ T708] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 38.498452][ T708] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10566) 
[ 38.498689][ T708] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 38.498990][ T708] ? _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) 
[ 38.499230][ T708] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 38.499470][ T708] register_netdevice (net/core/dev.c:11003) 
[ 38.499706][ T708] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 38.499938][ T708] ? __debugfs_create_file (fs/debugfs/inode.c:466) 
[ 38.500209][ T708] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 38.500456][ T708] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 38.500742][ T708] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 38.500926][ T708] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 38.501233][ T708] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 38.501523][ T708] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[ 38.501813][ T708] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[ 38.502189][ T708] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[ 38.502491][ T708] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[ 38.502725][ T708] ? 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)) 
[ 38.502903][ T708] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[ 38.503285][ T708] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[ 38.503523][ T708] __driver_probe_device (drivers/base/dd.c:800) 
[ 38.503764][ T708] driver_probe_device (drivers/base/dd.c:830) 
[ 38.504007][ T708] __device_attach_driver (drivers/base/dd.c:959) 
[ 38.504367][ T708] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[ 38.504646][ T708] bus_for_each_drv (drivers/base/bus.c:462) 
[ 38.504922][ T708] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[ 38.505288][ T708] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 38.505522][ T708] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 38.505753][ T708] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 38.506001][ T708] __device_attach (drivers/base/dd.c:1030) 
[ 38.506244][ T708] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[ 38.506602][ T708] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 38.506840][ T708] ? 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) 
[ 38.507087][ T708] bus_probe_device (drivers/base/bus.c:537) 
[ 38.507326][ T708] device_add (drivers/base/core.c:3672) 
[ 38.507692][ T708] ? __pfx_device_add (drivers/base/core.c:3548) 
[ 38.507920][ T708] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[ 38.508170][ T708] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[ 38.508613][ T708] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[ 38.508915][ T708] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 38.509154][ T708] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[ 38.509391][ T708] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 38.509748][ T708] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 38.509997][ T708] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[ 38.510188][ T708] ? __pfx_vfs_write (fs/read_write.c:660) 
[ 38.510416][ T708] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 38.510791][ T708] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:885) 
[ 38.511102][ T708] ksys_write (fs/read_write.c:731) 
[ 38.511280][ T708] ? __pfx_ksys_write (fs/read_write.c:721) 
[ 38.511506][ T708] ? kernfs_fop_llseek (fs/kernfs/file.c:891) 
[ 38.511884][ T708] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 38.512128][ T708] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   38.512404][  T708] RIP: 0033:0x7f761b61eb77
[ 38.512639][ T708] 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
[   38.513537][  T708] RSP: 002b:00007ffe3a0141e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   38.514016][  T708] RAX: ffffffffffffffda RBX: 00007f761b404140 RCX: 00007f761b61eb77
[   38.514423][  T708] RDX: 000000000000000b RSI: 000055e3fff98c30 RDI: 0000000000000006
[   38.514821][  T708] RBP: 000000000000000b R08: 0000000000000000 R09: 0000000000000000
[   38.515165][  T708] R10: 0000000000000002 R11: 0000000000000246 R12: 00007f760d341700
[   38.515498][  T708] R13: 000055e3fff98c30 R14: 0000000000000006 R15: 000055e3ffd6f900
| [   42.463337][  T708] ------------[ cut here ]------------
| [ 42.463827][ T708] WARNING: CPU: 2 PID: 708 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) 
| [   42.464310][  T708] Modules linked in: netdevsim psample unix_diag sctp
| [   42.465118][  T708] Tainted: [W]=WARN
[   42.465300][  T708] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 42.465609][ T708] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 42.465901][ T708] 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
[   42.466705][  T708] RSP: 0018:ffffc90000657528 EFLAGS: 00010246
[   42.467007][  T708] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   42.467337][  T708] RDX: 0000000000000000 RSI: ffff888005bdacd0 RDI: ffff88800e9550f8
[   42.467676][  T708] RBP: ffffffff95c53580 R08: 0000000000000000 R09: fffffbfff2742504
[   42.468101][  T708] R10: ffffffff93a12827 R11: ffff88800e9545c0 R12: 0000000000000000
[   42.468537][  T708] R13: ffff888005bda130 R14: ffff888005bda008 R15: ffff888005bda000
[   42.468988][  T708] FS:  00007f761b4041c0(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
[   42.469393][  T708] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   42.469684][  T708] CR2: 000055e3ffd99900 CR3: 000000000c01e003 CR4: 0000000000772ef0
[   42.470037][  T708] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   42.470373][  T708] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   42.470717][  T708] PKRU: 55555554
[   42.470893][  T708] Call Trace:
[   42.471085][  T708]  <TASK>
[ 42.471213][ T708] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 42.471445][ T708] ? __warn (kernel/panic.c:748) 
[ 42.471629][ T708] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 42.471865][ T708] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 42.472113][ T708] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 42.472296][ T708] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 42.472530][ T708] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 42.472776][ T708] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 42.473023][ T708] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10566) 
[ 42.473260][ T708] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 42.473550][ T708] ? _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) 
[ 42.473792][ T708] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 42.474043][ T708] register_netdevice (net/core/dev.c:11003) 
[ 42.474287][ T708] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 42.474520][ T708] ? __debugfs_create_file (fs/debugfs/inode.c:466) 
[ 42.474771][ T708] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 42.475033][ T708] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 42.475328][ T708] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 42.475511][ T708] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 42.475812][ T708] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 42.476132][ T708] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[ 42.476429][ T708] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[ 42.476675][ T708] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[ 42.476978][ T708] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[ 42.477211][ T708] ? 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)) 
[ 42.477399][ T708] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[ 42.477641][ T708] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[ 42.477882][ T708] __driver_probe_device (drivers/base/dd.c:800) 
[ 42.478130][ T708] driver_probe_device (drivers/base/dd.c:830) 
[ 42.478363][ T708] __device_attach_driver (drivers/base/dd.c:959) 
[ 42.478598][ T708] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[ 42.478884][ T708] bus_for_each_drv (drivers/base/bus.c:462) 
[ 42.479128][ T708] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[ 42.479359][ T708] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 42.479587][ T708] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 42.479822][ T708] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 42.480071][ T708] __device_attach (drivers/base/dd.c:1030) 
[ 42.480303][ T708] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[ 42.480539][ T708] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 42.480774][ T708] ? 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) 
[ 42.481035][ T708] bus_probe_device (drivers/base/bus.c:537) 
[ 42.481270][ T708] device_add (drivers/base/core.c:3672) 
[ 42.481509][ T708] ? __pfx_device_add (drivers/base/core.c:3548) 
[ 42.481741][ T708] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[ 42.481998][ T708] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[ 42.482294][ T708] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[ 42.482597][ T708] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 42.482825][ T708] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[ 42.483083][ T708] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 42.483316][ T708] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 42.483557][ T708] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[ 42.483745][ T708] ? __pfx_vfs_write (fs/read_write.c:660) 
[ 42.483993][ T708] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 42.484239][ T708] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:885) 
[ 42.484532][ T708] ksys_write (fs/read_write.c:731) 
[ 42.484716][ T708] ? __pfx_ksys_write (fs/read_write.c:721) 
[ 42.484983][ T708] ? kernfs_fop_llseek (fs/kernfs/file.c:891) 
[ 42.485230][ T708] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 42.485464][ T708] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   42.485746][  T708] RIP: 0033:0x7f761b61eb77
[ 42.486001][ T708] 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
[   42.486771][  T708] RSP: 002b:00007ffe3a0141e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   42.487122][  T708] RAX: ffffffffffffffda RBX: 00007f761b404140 RCX: 00007f761b61eb77
[   42.487458][  T708] RDX: 0000000000000009 RSI: 000055e3fff98c30 RDI: 0000000000000006
[   42.487789][  T708] RBP: 0000000000000009 R08: 0000000000000000 R09: 0000000000000000
[   42.488147][  T708] R10: 0000000000000002 R11: 0000000000000246 R12: 00007f760d341700


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