======================================
| 0
| xx__-> [   20.360311][  T921] ------------[ cut here ]------------
| [ 20.360682][ T921] WARNING: CPU: 3 PID: 921 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) 
| [   20.361200][  T921] Modules linked in: netdevsim psample
[   20.361980][  T921] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 20.362259][ T921] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 20.362538][ T921] 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
[   20.363288][  T921] RSP: 0018:ffffc90002c17528 EFLAGS: 00010246
[   20.363559][  T921] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   20.363894][  T921] RDX: 0000000000000000 RSI: ffff888013812cd0 RDI: ffff888009ec50f8
[   20.364225][  T921] RBP: ffffffffb9c53580 R08: 0000000000000000 R09: fffffbfff6f42504
[   20.364543][  T921] R10: ffffffffb7a12827 R11: ffff888009ec45c0 R12: 0000000000000000
[   20.364885][  T921] R13: ffff888013812130 R14: ffff888013812008 R15: ffff888013812000
[   20.365206][  T921] FS:  00007f704cf89740(0000) GS:ffff88806cf80000(0000) knlGS:0000000000000000
[   20.365575][  T921] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   20.365864][  T921] CR2: 0000559a76918d80 CR3: 000000000261c002 CR4: 0000000000772ef0
[   20.366186][  T921] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   20.366507][  T921] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   20.366838][  T921] PKRU: 55555554
[   20.367004][  T921] Call Trace:
[   20.367168][  T921]  <TASK>
[ 20.367288][ T921] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 20.367506][ T921] ? __warn (kernel/panic.c:748) 
[ 20.367671][ T921] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 20.367898][ T921] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 20.368118][ T921] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 20.368285][ T921] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 20.368502][ T921] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 20.368745][ T921] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 20.368971][ T921] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10566) 
[ 20.369192][ T921] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 20.369459][ T921] ? _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) 
[ 20.369681][ T921] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 20.369924][ T921] register_netdevice (net/core/dev.c:11003) 
[ 20.370158][ T921] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 20.370368][ T921] ? __debugfs_create_file (fs/debugfs/inode.c:466) 
[ 20.370595][ T921] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 20.370836][ T921] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 20.371105][ T921] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 20.371269][ T921] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 20.371551][ T921] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 20.371836][ T921] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[ 20.372109][ T921] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[ 20.372332][ T921] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[ 20.372604][ T921] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[ 20.372832][ T921] ? 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)) 
[ 20.372994][ T921] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[ 20.373219][ T921] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[ 20.373439][ T921] __driver_probe_device (drivers/base/dd.c:800) 
[ 20.373654][ T921] driver_probe_device (drivers/base/dd.c:830) 
[ 20.373885][ T921] __device_attach_driver (drivers/base/dd.c:959) 
[ 20.374110][ T921] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[ 20.374369][ T921] bus_for_each_drv (drivers/base/bus.c:462) 
[ 20.374582][ T921] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[ 20.374813][ T921] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 20.375025][ T921] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 20.375235][ T921] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 20.375453][ T921] __device_attach (drivers/base/dd.c:1030) 
[ 20.375674][ T921] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[ 20.375897][ T921] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 20.376110][ T921] ? 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) 
[ 20.376334][ T921] bus_probe_device (drivers/base/bus.c:537) 
[ 20.376550][ T921] device_add (drivers/base/core.c:3672) 
[ 20.376780][ T921] ? __pfx_device_add (drivers/base/core.c:3548) 
[ 20.376995][ T921] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[ 20.377220][ T921] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[ 20.377493][ T921] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[ 20.377790][ T921] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 20.378008][ T921] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[ 20.378226][ T921] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 20.378436][ T921] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 20.378655][ T921] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[ 20.378841][ T921] ? __pfx_vfs_write (fs/read_write.c:660) 
[ 20.379061][ T921] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 20.379269][ T921] ? 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) 
[ 20.379496][ T921] ? __pfx___up_read (kernel/locking/rwsem.c:1337) 
[ 20.379715][ T921] ksys_write (fs/read_write.c:731) 
[ 20.379891][ T921] ? __pfx_ksys_write (fs/read_write.c:721) 
[ 20.380101][ T921] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[ 20.380323][ T921] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 20.380538][ T921] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   20.380812][  T921] RIP: 0033:0x7f704d0cab77
[ 20.381037][ T921] 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
[   20.381790][  T921] RSP: 002b:00007ffea24ee748 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   20.382112][  T921] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f704d0cab77
[   20.382433][  T921] RDX: 0000000000000004 RSI: 000055ddf5179f80 RDI: 0000000000000001
[   20.382764][  T921] RBP: 000055ddf5179f80 R08: 0000000000000003 R09: 0000000000000000
[   20.383081][  T921] R10: 0000000000000020 R11: 0000000000000246 R12: 0000000000000004
[   20.383398][  T921] R13: 00007f704d186760 R14: 0000000000000004 R15: 00007f704d1819c0
| [   20.402282][  T921] ------------[ cut here ]------------
| [ 20.402780][ T921] WARNING: CPU: 2 PID: 921 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) 
| [   20.403292][  T921] Modules linked in: netdevsim psample
| [   20.404196][  T921] Tainted: [W]=WARN
[   20.404417][  T921] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 20.404715][ T921] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 20.405047][ T921] 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
[   20.405864][  T921] RSP: 0018:ffffc90002c17528 EFLAGS: 00010246
[   20.406162][  T921] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   20.406516][  T921] RDX: 0000000000000000 RSI: ffff88800e14acd0 RDI: ffff888009ec50f8
[   20.406874][  T921] RBP: ffffffffb9c53580 R08: 0000000000000000 R09: fffffbfff6f42504
[   20.407208][  T921] R10: ffffffffb7a12827 R11: ffff888009ec45c0 R12: 0000000000000000
[   20.407548][  T921] R13: ffff88800e14a130 R14: ffff88800e14a008 R15: ffff88800e14a000
[   20.407910][  T921] FS:  00007f704cf89740(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
[   20.408309][  T921] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   20.408604][  T921] CR2: 0000559a76938148 CR3: 000000000261c001 CR4: 0000000000772ef0
[   20.408957][  T921] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   20.409313][  T921] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   20.409666][  T921] PKRU: 55555554
[   20.409869][  T921] Call Trace:
[   20.410052][  T921]  <TASK>
[ 20.410183][ T921] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 20.410416][ T921] ? __warn (kernel/panic.c:748) 
[ 20.410603][ T921] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 20.410867][ T921] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 20.411119][ T921] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 20.411304][ T921] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 20.411536][ T921] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 20.411808][ T921] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 20.412049][ T921] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10566) 
[ 20.412296][ T921] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 20.412594][ T921] ? _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) 
[ 20.412859][ T921] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 20.413106][ T921] register_netdevice (net/core/dev.c:11003) 
[ 20.413361][ T921] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 20.413596][ T921] ? __debugfs_create_file (fs/debugfs/inode.c:466) 
[ 20.413868][ T921] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 20.414136][ T921] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 20.414445][ T921] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 20.414635][ T921] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 20.414960][ T921] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 20.415260][ T921] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[ 20.415563][ T921] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[ 20.415823][ T921] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[ 20.416120][ T921] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[ 20.416357][ T921] ? 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)) 
[ 20.416542][ T921] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[ 20.416802][ T921] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[ 20.417047][ T921] __driver_probe_device (drivers/base/dd.c:800) 
[ 20.417283][ T921] driver_probe_device (drivers/base/dd.c:830) 
[ 20.417518][ T921] __device_attach_driver (drivers/base/dd.c:959) 
[ 20.417772][ T921] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[ 20.418061][ T921] bus_for_each_drv (drivers/base/bus.c:462) 
[ 20.418299][ T921] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[ 20.418533][ T921] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 20.418788][ T921] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 20.419027][ T921] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 20.419278][ T921] __device_attach (drivers/base/dd.c:1030) 
[ 20.419525][ T921] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[ 20.419782][ T921] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 20.420022][ T921] ? 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) 
[ 20.420264][ T921] bus_probe_device (drivers/base/bus.c:537) 
[ 20.420503][ T921] device_add (drivers/base/core.c:3672) 
[ 20.420754][ T921] ? __pfx_device_add (drivers/base/core.c:3548) 
[ 20.420989][ T921] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[ 20.421234][ T921] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[ 20.421534][ T921] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[ 20.421849][ T921] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 20.422078][ T921] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[ 20.422319][ T921] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 20.422551][ T921] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 20.422804][ T921] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[ 20.422996][ T921] ? __pfx_vfs_write (fs/read_write.c:660) 
[ 20.423235][ T921] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 20.423478][ T921] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 20.423736][ T921] ksys_write (fs/read_write.c:731) 
[ 20.423925][ T921] ? __pfx_ksys_write (fs/read_write.c:721) 
[ 20.424182][ T921] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 20.424417][ T921] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   20.424697][  T921] RIP: 0033:0x7f704d0cab77
[ 20.424950][ T921] 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
[   20.425709][  T921] RSP: 002b:00007ffea24ee748 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   20.426060][  T921] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f704d0cab77
[   20.426395][  T921] RDX: 0000000000000004 RSI: 000055ddf5179f80 RDI: 0000000000000001
[   20.426743][  T921] RBP: 000055ddf5179f80 R08: 0000000000000000 R09: 00007f704d13d4e0
[   20.427082][  T921] R10: 00007f704d13d3e0 R11: 0000000000000246 R12: 0000000000000004


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