======================================
| 0
| xx__-> [  851.845295][T11251] ------------[ cut here ]------------
| [851.845665][T11251] WARNING: CPU: 1 PID: 11251 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) 
| [  851.846096][T11251] Modules linked in: netdevsim psample unix_diag bonding sch_fq vxlan ip6_gre gre xfrm_interface sha1_generic xfrm_user xt_length nft_compat nf_tables act_ct nf_flow_table nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 act_gact cls_flower sctp_diag sctp act_mirred cls_u32 sch_ingress ifb [last unloaded: test_bpf]
[  851.847664][T11251] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[851.847940][T11251] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 851.848209][T11251] 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
[  851.848932][T11251] RSP: 0018:ffffc90000617528 EFLAGS: 00010246
[  851.849339][T11251] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[  851.849661][T11251] RDX: 0000000000000000 RSI: ffff8880112f2cd0 RDI: ffff88800b8a2e38
[  851.849980][T11251] RBP: ffffffffac453580 R08: 0000000000000000 R09: fffffbfff5442504
[  851.850298][T11251] R10: ffffffffaa212827 R11: ffff88800b8a2300 R12: 0000000000000000
[  851.850621][T11251] R13: ffff8880112f2130 R14: ffff8880112f2008 R15: ffff8880112f2000
[  851.850958][T11251] FS:  00007fe6480b31c0(0000) GS:ffff88806ce80000(0000) knlGS:0000000000000000
[  851.851323][T11251] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  851.851586][T11251] CR2: 00007fe64873ac50 CR3: 000000000be84006 CR4: 0000000000772ef0
[  851.851916][T11251] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  851.852240][T11251] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  851.852554][T11251] PKRU: 55555554
[  851.852723][T11251] Call Trace:
[  851.852895][T11251]  <TASK>
[851.853007][T11251] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[851.853234][T11251] ? __warn (kernel/panic.c:748) 
[851.853395][T11251] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[851.853610][T11251] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[851.853834][T11251] ? handle_bug (arch/x86/kernel/traps.c:285) 
[851.854007][T11251] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[851.854214][T11251] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[851.854446][T11251] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[851.854656][T11251] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10566) 
[851.854878][T11251] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[851.855155][T11251] ? _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) 
[851.855373][T11251] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[851.855597][T11251] register_netdevice (net/core/dev.c:11003) 
[851.855823][T11251] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[851.856029][T11251] ? __debugfs_create_file (fs/debugfs/inode.c:466) 
[851.856258][T11251] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[851.856486][T11251] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[851.856771][T11251] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[851.856934][T11251] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[851.857211][T11251] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[851.857483][T11251] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[851.857774][T11251] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[851.857997][T11251] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[851.858263][T11251] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[851.858482][T11251] ? 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)) 
[851.858651][T11251] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[851.858889][T11251] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[851.859114][T11251] __driver_probe_device (drivers/base/dd.c:800) 
[851.859323][T11251] driver_probe_device (drivers/base/dd.c:830) 
[851.859534][T11251] __device_attach_driver (drivers/base/dd.c:959) 
[851.859767][T11251] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[851.860023][T11251] bus_for_each_drv (drivers/base/bus.c:462) 
[851.860249][T11251] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[851.860455][T11251] ? bus_to_subsys (drivers/base/bus.c:85) 
[851.860671][T11251] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[851.860889][T11251] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[851.861185][T11251] __device_attach (drivers/base/dd.c:1030) 
[851.861552][T11251] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[851.861939][T11251] ? bus_to_subsys (drivers/base/bus.c:85) 
[851.862304][T11251] ? 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) 
[851.862562][T11251] bus_probe_device (drivers/base/bus.c:537) 
[851.862781][T11251] device_add (drivers/base/core.c:3672) 
[851.862991][T11251] ? __pfx_device_add (drivers/base/core.c:3548) 
[851.863204][T11251] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[851.863430][T11251] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[851.863709][T11251] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[851.863989][T11251] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[851.864205][T11251] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[851.864421][T11251] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[851.864635][T11251] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[851.864871][T11251] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[851.865036][T11251] ? __pfx_vfs_write (fs/read_write.c:660) 
[851.865259][T11251] ? __lock_release (kernel/locking/lockdep.c:5527) 
[851.865472][T11251] ? 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) 
[851.865696][T11251] ? __pfx___up_read (kernel/locking/rwsem.c:1337) 
[851.865936][T11251] ksys_write (fs/read_write.c:731) 
[851.866096][T11251] ? __pfx_ksys_write (fs/read_write.c:721) 
[851.866301][T11251] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[851.866532][T11251] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[851.866761][T11251] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  851.867027][T11251] RIP: 0033:0x7fe6482cdb77
[ 851.867246][T11251] 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
[  851.867979][T11251] RSP: 002b:00007ffc26948858 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[  851.868303][T11251] RAX: ffffffffffffffda RBX: 00007fe6480b3140 RCX: 00007fe6482cdb77
[  851.868619][T11251] RDX: 0000000000000009 RSI: 000055f0f8a66fa0 RDI: 0000000000000006
[  851.868962][T11251] RBP: 0000000000000009 R08: 0000000000000000 R09: 0000000000000000
[  851.869274][T11251] R10: 0000000000000002 R11: 0000000000000246 R12: 00007fe63a16b340
[  851.869605][T11251] R13: 000055f0f8a66fa0 R14: 0000000000000006 R15: 000055f0f883e900
| [  854.924165][T11251] ------------[ cut here ]------------
| [854.924564][T11251] WARNING: CPU: 2 PID: 11251 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) 
| [  854.925033][T11251] Modules linked in: netdevsim psample unix_diag bonding sch_fq vxlan ip6_gre gre xfrm_interface sha1_generic xfrm_user xt_length nft_compat nf_tables act_ct nf_flow_table nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 act_gact cls_flower sctp_diag sctp act_mirred cls_u32 sch_ingress ifb [last unloaded: test_bpf]
| [  854.927074][T11251] Tainted: [W]=WARN
[  854.927271][T11251] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[854.927545][T11251] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 854.927848][T11251] 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
[  854.928573][T11251] RSP: 0018:ffffc90000617528 EFLAGS: 00010246
[  854.928884][T11251] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[  854.929207][T11251] RDX: 0000000000000000 RSI: ffff88800a1dacd0 RDI: ffff88800b8a2e38
[  854.929544][T11251] RBP: ffffffffac453580 R08: 0000000000000000 R09: fffffbfff5442504
[  854.929887][T11251] R10: ffffffffaa212827 R11: ffff88800b8a2300 R12: 0000000000000000
[  854.930421][T11251] R13: ffff88800a1da130 R14: ffff88800a1da008 R15: ffff88800a1da000
[  854.930772][T11251] FS:  00007fe6480b31c0(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
[  854.931149][T11251] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  854.931439][T11251] CR2: 00007fe63aaf1d60 CR3: 000000000be84004 CR4: 0000000000772ef0
[  854.931796][T11251] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  854.932132][T11251] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  854.932458][T11251] PKRU: 55555554
[  854.932642][T11251] Call Trace:
[  854.932846][T11251]  <TASK>
[854.932971][T11251] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[854.933219][T11251] ? __warn (kernel/panic.c:748) 
[854.933406][T11251] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[854.933647][T11251] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[854.933900][T11251] ? handle_bug (arch/x86/kernel/traps.c:285) 
[854.934089][T11251] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[854.934327][T11251] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[854.934582][T11251] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[854.934837][T11251] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10566) 
[854.935084][T11251] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[854.935384][T11251] ? _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) 
[854.935628][T11251] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[854.935886][T11251] register_netdevice (net/core/dev.c:11003) 
[854.936129][T11251] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[854.936365][T11251] ? __debugfs_create_file (fs/debugfs/inode.c:466) 
[854.936622][T11251] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[854.936889][T11251] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[854.937175][T11251] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[854.937351][T11251] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[854.937637][T11251] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[854.937937][T11251] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[854.938235][T11251] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[854.938482][T11251] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[854.938784][T11251] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[854.939027][T11251] ? 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)) 
[854.939212][T11251] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[854.939460][T11251] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[854.939701][T11251] __driver_probe_device (drivers/base/dd.c:800) 
[854.939957][T11251] driver_probe_device (drivers/base/dd.c:830) 
[854.940202][T11251] __device_attach_driver (drivers/base/dd.c:959) 
[854.940444][T11251] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[854.940731][T11251] bus_for_each_drv (drivers/base/bus.c:462) 
[854.940993][T11251] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[854.941220][T11251] ? bus_to_subsys (drivers/base/bus.c:85) 
[854.941442][T11251] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[854.941667][T11251] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[854.941904][T11251] __device_attach (drivers/base/dd.c:1030) 
[854.942138][T11251] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[854.942363][T11251] ? bus_to_subsys (drivers/base/bus.c:85) 
[854.942589][T11251] ? 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) 
[854.942841][T11251] bus_probe_device (drivers/base/bus.c:537) 
[854.943089][T11251] device_add (drivers/base/core.c:3672) 
[854.943341][T11251] ? __pfx_device_add (drivers/base/core.c:3548) 
[854.943572][T11251] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[854.943820][T11251] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[854.944100][T11251] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[854.944380][T11251] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[854.944601][T11251] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[854.944851][T11251] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[854.945076][T11251] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[854.945304][T11251] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[854.945485][T11251] ? __pfx_vfs_write (fs/read_write.c:660) 
[854.945705][T11251] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[854.945947][T11251] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:885) 
[854.946223][T11251] ksys_write (fs/read_write.c:731) 
[854.946397][T11251] ? __pfx_ksys_write (fs/read_write.c:721) 
[854.946621][T11251] ? kernfs_fop_llseek (fs/kernfs/file.c:891) 
[854.946861][T11251] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[854.947088][T11251] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  854.947359][T11251] RIP: 0033:0x7fe6482cdb77
[ 854.947589][T11251] 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
[  854.948321][T11251] RSP: 002b:00007ffc269488f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[  854.948645][T11251] RAX: ffffffffffffffda RBX: 00007fe6480b3140 RCX: 00007fe6482cdb77
[  854.948980][T11251] RDX: 000000000000000b RSI: 000055f0f8a6aeb0 RDI: 0000000000000006
[  854.949298][T11251] RBP: 000000000000000b R08: 0000000000000000 R09: 0000000000000000
[  854.949623][T11251] R10: 0000000000000002 R11: 0000000000000246 R12: 00007fe639ff5280
[  854.949946][T11251] R13: 000055f0f8a6aeb0 R14: 0000000000000006 R15: 000055f0f883e900
| [  858.741584][T11251] ------------[ cut here ]------------
| [858.741933][T11251] WARNING: CPU: 0 PID: 11251 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) 
| [  858.742472][T11251] Modules linked in: netdevsim psample unix_diag bonding sch_fq vxlan ip6_gre gre xfrm_interface sha1_generic xfrm_user xt_length nft_compat nf_tables act_ct nf_flow_table nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 act_gact cls_flower sctp_diag sctp act_mirred cls_u32 sch_ingress ifb [last unloaded: test_bpf]
| [  858.744176][T11251] Tainted: [W]=WARN
[  858.744349][T11251] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[858.744609][T11251] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 858.744885][T11251] 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
[  858.745609][T11251] RSP: 0018:ffffc90000617528 EFLAGS: 00010246
[  858.745888][T11251] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[  858.746206][T11251] RDX: 0000000000000000 RSI: ffff88800a78acd0 RDI: ffff88800b8a2e38
[  858.746527][T11251] RBP: ffffffffac453580 R08: 0000000000000000 R09: fffffbfff5442504
[  858.746874][T11251] R10: ffffffffaa212827 R11: ffff88800b8a2300 R12: 0000000000000000
[  858.747198][T11251] R13: ffff88800a78a130 R14: ffff88800a78a008 R15: ffff88800a78a000
[  858.747517][T11251] FS:  00007fe6480b31c0(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
[  858.747882][T11251] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  858.748139][T11251] CR2: 000055f0f8868900 CR3: 000000000be84002 CR4: 0000000000772ef0
[  858.748479][T11251] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  858.748819][T11251] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  858.749148][T11251] PKRU: 55555554
[  858.749315][T11251] Call Trace:
[  858.749471][T11251]  <TASK>
[858.749590][T11251] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[858.749902][T11251] ? __warn (kernel/panic.c:748) 
[858.750075][T11251] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[858.750284][T11251] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[858.750508][T11251] ? handle_bug (arch/x86/kernel/traps.c:285) 
[858.750668][T11251] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[858.750912][T11251] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[858.751148][T11251] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[858.751373][T11251] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10566) 
[858.751602][T11251] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[858.751882][T11251] ? _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) 
[858.752097][T11251] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[858.752313][T11251] register_netdevice (net/core/dev.c:11003) 
[858.752525][T11251] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[858.752742][T11251] ? __debugfs_create_file (fs/debugfs/inode.c:466) 
[858.753011][T11251] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[858.753244][T11251] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[858.753508][T11251] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[858.753670][T11251] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[858.753952][T11251] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[858.754218][T11251] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[858.754487][T11251] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[858.754707][T11251] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[858.754992][T11251] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[858.755201][T11251] ? 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)) 
[858.755359][T11251] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[858.755574][T11251] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[858.755799][T11251] __driver_probe_device (drivers/base/dd.c:800) 
[858.756025][T11251] driver_probe_device (drivers/base/dd.c:830) 
[858.756246][T11251] __device_attach_driver (drivers/base/dd.c:959) 
[858.756506][T11251] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[858.756796][T11251] bus_for_each_drv (drivers/base/bus.c:462) 
[858.757033][T11251] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[858.757248][T11251] ? bus_to_subsys (drivers/base/bus.c:85) 
[858.757459][T11251] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[858.757664][T11251] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[858.757898][T11251] __device_attach (drivers/base/dd.c:1030) 
[858.758109][T11251] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[858.758312][T11251] ? bus_to_subsys (drivers/base/bus.c:85) 
[858.758518][T11251] ? 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) 
[858.758731][T11251] bus_probe_device (drivers/base/bus.c:537) 
[858.758950][T11251] device_add (drivers/base/core.c:3672) 
[858.759159][T11251] ? __pfx_device_add (drivers/base/core.c:3548) 
[858.759363][T11251] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[858.759594][T11251] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[858.759882][T11251] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[858.760162][T11251] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[858.760388][T11251] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[858.760612][T11251] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[858.760850][T11251] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[858.761077][T11251] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[858.761247][T11251] ? __pfx_vfs_write (fs/read_write.c:660) 
[858.761450][T11251] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[858.761670][T11251] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:885) 
[858.761944][T11251] ksys_write (fs/read_write.c:731) 
[858.762111][T11251] ? __pfx_ksys_write (fs/read_write.c:721) 
[858.762327][T11251] ? kernfs_fop_llseek (fs/kernfs/file.c:891) 
[858.762550][T11251] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[858.762768][T11251] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  858.763031][T11251] RIP: 0033:0x7fe6482cdb77
[ 858.763251][T11251] 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
[  858.763975][T11251] RSP: 002b:00007ffc269488f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[  858.764298][T11251] RAX: ffffffffffffffda RBX: 00007fe6480b3140 RCX: 00007fe6482cdb77
[  858.764600][T11251] RDX: 0000000000000009 RSI: 000055f0f8a6aeb0 RDI: 0000000000000006
[  858.764936][T11251] RBP: 0000000000000009 R08: 0000000000000000 R09: 0000000000000000
[  858.765241][T11251] R10: 0000000000000002 R11: 0000000000000246 R12: 00007fe639ff5280


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