======================================
| 0
| xx__-> [ 4469.360207][T21076] ------------[ cut here ]------------
| [4469.360642][T21076] WARNING: CPU: 0 PID: 21076 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) 
| [ 4469.361091][T21076] Modules linked in: netdevsim psample act_mirred cls_flower sch_ingress vxlan ip6t_rpfilter xfrm_user l2tp_ip6 l2tp_eth l2tp_ip l2tp_netlink l2tp_core nft_chain_nat xt_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip6t_REJECT ipt_REJECT nft_compat nf_tables
[ 4469.362704][T21076] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[4469.362968][T21076] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 4469.363247][T21076] 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
[ 4469.364146][T21076] RSP: 0018:ffffc90000667528 EFLAGS: 00010246
[ 4469.364433][T21076] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[ 4469.364748][T21076] RDX: 0000000000000000 RSI: ffff888011d62cd0 RDI: ffff8880027350f8
[ 4469.365059][T21076] RBP: ffffffffa5a53580 R08: 0000000000000000 R09: fffffbfff4702504
[ 4469.365388][T21076] R10: ffffffffa3812827 R11: ffff8880027345c0 R12: 0000000000000000
[ 4469.365712][T21076] R13: ffff888011d62130 R14: ffff888011d62008 R15: ffff888011d62000
[ 4469.366029][T21076] FS:  00007fce03f78740(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
[ 4469.366405][T21076] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 4469.366675][T21076] CR2: 0000564205628f88 CR3: 0000000005448006 CR4: 0000000000772ef0
[ 4469.366986][T21076] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 4469.367309][T21076] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 4469.367619][T21076] PKRU: 55555554
[ 4469.367781][T21076] Call Trace:
[ 4469.367940][T21076]  <TASK>
[4469.368053][T21076] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[4469.368283][T21076] ? __warn (kernel/panic.c:748) 
[4469.368445][T21076] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[4469.368653][T21076] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[4469.368873][T21076] ? handle_bug (arch/x86/kernel/traps.c:285) 
[4469.369031][T21076] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[4469.369248][T21076] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[4469.369481][T21076] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[4469.369693][T21076] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10566) 
[4469.369905][T21076] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[4469.370179][T21076] ? _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) 
[4469.370396][T21076] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[4469.370615][T21076] register_netdevice (net/core/dev.c:11003) 
[4469.370838][T21076] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[4469.371044][T21076] ? __debugfs_create_file (fs/debugfs/inode.c:466) 
[4469.371285][T21076] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[4469.371509][T21076] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[4469.371789][T21076] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[4469.371956][T21076] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[4469.372243][T21076] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[4469.372512][T21076] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[4469.372787][T21076] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[4469.373009][T21076] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[4469.373281][T21076] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[4469.373490][T21076] ? 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)) 
[4469.373649][T21076] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[4469.373869][T21076] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[4469.374084][T21076] __driver_probe_device (drivers/base/dd.c:800) 
[4469.374307][T21076] driver_probe_device (drivers/base/dd.c:830) 
[4469.374516][T21076] __device_attach_driver (drivers/base/dd.c:959) 
[4469.374728][T21076] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[4469.374981][T21076] bus_for_each_drv (drivers/base/bus.c:462) 
[4469.375199][T21076] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[4469.375407][T21076] ? bus_to_subsys (drivers/base/bus.c:85) 
[4469.375626][T21076] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[4469.375841][T21076] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[4469.376054][T21076] __device_attach (drivers/base/dd.c:1030) 
[4469.376271][T21076] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[4469.376476][T21076] ? bus_to_subsys (drivers/base/bus.c:85) 
[4469.376684][T21076] ? 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) 
[4469.376898][T21076] bus_probe_device (drivers/base/bus.c:537) 
[4469.377108][T21076] device_add (drivers/base/core.c:3672) 
[4469.377332][T21076] ? __pfx_device_add (drivers/base/core.c:3548) 
[4469.377537][T21076] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[4469.377755][T21076] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[4469.378020][T21076] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[4469.378301][T21076] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[4469.378507][T21076] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[4469.378720][T21076] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[4469.378932][T21076] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[4469.379146][T21076] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[4469.379323][T21076] ? __pfx_vfs_write (fs/read_write.c:660) 
[4469.379539][T21076] ? __lock_release (kernel/locking/lockdep.c:5527) 
[4469.379743][T21076] ? 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) 
[4469.379965][T21076] ? __pfx___up_read (kernel/locking/rwsem.c:1337) 
[4469.380184][T21076] ksys_write (fs/read_write.c:731) 
[4469.380343][T21076] ? __pfx_ksys_write (fs/read_write.c:721) 
[4469.380552][T21076] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[4469.380771][T21076] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[4469.380981][T21076] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 4469.381246][T21076] RIP: 0033:0x7fce040b9b77
[ 4469.381465][T21076] 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
[ 4469.382195][T21076] RSP: 002b:00007fff34efefd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[ 4469.382508][T21076] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007fce040b9b77
[ 4469.382815][T21076] RDX: 0000000000000004 RSI: 0000564205627f80 RDI: 0000000000000001
[ 4469.383126][T21076] RBP: 0000564205627f80 R08: 0000000000000003 R09: 0000000000000000
[ 4469.383447][T21076] R10: 0000000000000020 R11: 0000000000000246 R12: 0000000000000004
[ 4469.383757][T21076] R13: 00007fce04175760 R14: 0000000000000004 R15: 00007fce041709c0
| [ 4469.402801][T21076] ------------[ cut here ]------------
| [4469.403158][T21076] WARNING: CPU: 2 PID: 21076 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) 
| [ 4469.403609][T21076] Modules linked in: netdevsim psample act_mirred cls_flower sch_ingress vxlan ip6t_rpfilter xfrm_user l2tp_ip6 l2tp_eth l2tp_ip l2tp_netlink l2tp_core nft_chain_nat xt_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip6t_REJECT ipt_REJECT nft_compat nf_tables
| [ 4469.405197][T21076] Tainted: [W]=WARN
[ 4469.405532][T21076] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[4469.405811][T21076] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 4469.406092][T21076] 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
[ 4469.406839][T21076] RSP: 0018:ffffc90000667528 EFLAGS: 00010246
[ 4469.407122][T21076] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[ 4469.407454][T21076] RDX: 0000000000000000 RSI: ffff8880130aacd0 RDI: ffff8880027350f8
[ 4469.407778][T21076] RBP: ffffffffa5a53580 R08: 0000000000000000 R09: fffffbfff4702504
[ 4469.408098][T21076] R10: ffffffffa3812827 R11: ffff8880027345c0 R12: 0000000000000000
[ 4469.408438][T21076] R13: ffff8880130aa130 R14: ffff8880130aa008 R15: ffff8880130aa000
[ 4469.408761][T21076] FS:  00007fce03f78740(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
[ 4469.409136][T21076] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 4469.409418][T21076] CR2: 000055741e930000 CR3: 0000000005448001 CR4: 0000000000772ef0
[ 4469.409743][T21076] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 4469.410080][T21076] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 4469.410412][T21076] PKRU: 55555554
[ 4469.410586][T21076] Call Trace:
[ 4469.410757][T21076]  <TASK>
[4469.410886][T21076] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[4469.411114][T21076] ? __warn (kernel/panic.c:748) 
[4469.411306][T21076] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[4469.411529][T21076] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[4469.411755][T21076] ? handle_bug (arch/x86/kernel/traps.c:285) 
[4469.411930][T21076] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[4469.412154][T21076] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[4469.412400][T21076] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[4469.412623][T21076] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10566) 
[4469.412853][T21076] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[4469.413134][T21076] ? _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) 
[4469.413375][T21076] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[4469.413608][T21076] register_netdevice (net/core/dev.c:11003) 
[4469.413834][T21076] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[4469.414056][T21076] ? __debugfs_create_file (fs/debugfs/inode.c:466) 
[4469.414308][T21076] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[4469.414551][T21076] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[4469.414831][T21076] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[4469.415010][T21076] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[4469.415304][T21076] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[4469.415600][T21076] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[4469.415886][T21076] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[4469.416123][T21076] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[4469.416409][T21076] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[4469.416634][T21076] ? 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)) 
[4469.416805][T21076] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[4469.417034][T21076] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[4469.417272][T21076] __driver_probe_device (drivers/base/dd.c:800) 
[4469.417505][T21076] driver_probe_device (drivers/base/dd.c:830) 
[4469.417726][T21076] __device_attach_driver (drivers/base/dd.c:959) 
[4469.417950][T21076] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[4469.418228][T21076] bus_for_each_drv (drivers/base/bus.c:462) 
[4469.418453][T21076] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[4469.418669][T21076] ? bus_to_subsys (drivers/base/bus.c:85) 
[4469.418888][T21076] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[4469.419112][T21076] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[4469.419348][T21076] __device_attach (drivers/base/dd.c:1030) 
[4469.419570][T21076] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[4469.419791][T21076] ? bus_to_subsys (drivers/base/bus.c:85) 
[4469.420017][T21076] ? 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) 
[4469.420256][T21076] bus_probe_device (drivers/base/bus.c:537) 
[4469.420486][T21076] device_add (drivers/base/core.c:3672) 
[4469.420718][T21076] ? __pfx_device_add (drivers/base/core.c:3548) 
[4469.420945][T21076] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[4469.421191][T21076] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[4469.421478][T21076] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[4469.421764][T21076] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[4469.422304][T21076] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[4469.422533][T21076] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[4469.422759][T21076] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[4469.422987][T21076] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[4469.423180][T21076] ? __pfx_vfs_write (fs/read_write.c:660) 
[4469.423418][T21076] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[4469.423650][T21076] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[4469.423881][T21076] ksys_write (fs/read_write.c:731) 
[4469.424057][T21076] ? __pfx_ksys_write (fs/read_write.c:721) 
[4469.424437][T21076] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[4469.424664][T21076] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 4469.424934][T21076] RIP: 0033:0x7fce040b9b77
[ 4469.425315][T21076] 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
[ 4469.426070][T21076] RSP: 002b:00007fff34efefd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[ 4469.426546][T21076] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007fce040b9b77
[ 4469.426870][T21076] RDX: 0000000000000004 RSI: 0000564205627f80 RDI: 0000000000000001
[ 4469.427205][T21076] RBP: 0000564205627f80 R08: 0000000000000000 R09: 00007fce0412c4e0
[ 4469.427530][T21076] R10: 00007fce0412c3e0 R11: 0000000000000246 R12: 0000000000000004


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