======================================
| 0
| xx__-> [   70.279464][ T1122] ------------[ cut here ]------------
| [ 70.279833][ T1122] WARNING: CPU: 0 PID: 1122 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:10596) 
| [   70.280278][ T1122] Modules linked in: netdevsim psample bonding sch_etf sch_fq [last unloaded: test_bpf]
[   70.281035][ T1122] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 70.281318][ T1122] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
[ 70.281611][ T1122] Code: 00 e8 13 47 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 5f 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:	13 47 fe             	adc    -0x2(%rdi),%eax
   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 5f 99 00       	call   0x995fb9
  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
[   70.282371][ T1122] RSP: 0018:ffffc90001377528 EFLAGS: 00010246
[   70.282760][ T1122] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   70.283088][ T1122] RDX: 0000000000000000 RSI: ffff88800dc9acd0 RDI: ffff888008a9ae38
[   70.283509][ T1122] RBP: ffffffffae053580 R08: 0000000000000000 R09: fffffbfff57c2504
[   70.283837][ T1122] R10: ffffffffabe12827 R11: ffff888008a9a300 R12: 0000000000000000
[   70.284315][ T1122] R13: ffff88800dc9a130 R14: ffff88800dc9a008 R15: ffff88800dc9a000
[   70.284749][ T1122] FS:  00007f2e9c88c1c0(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
[   70.285129][ T1122] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   70.285417][ T1122] CR2: 00007f2e8e9a6fb0 CR3: 00000000094bc002 CR4: 0000000000772ef0
[   70.285754][ T1122] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   70.286089][ T1122] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   70.286425][ T1122] PKRU: 55555554
[   70.286596][ T1122] Call Trace:
[   70.286767][ T1122]  <TASK>
[ 70.286887][ T1122] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
[ 70.287112][ T1122] ? __warn (kernel/panic.c:748) 
[ 70.287283][ T1122] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
[ 70.287520][ T1122] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 70.287746][ T1122] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 70.287914][ T1122] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 70.288133][ T1122] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 70.288365][ T1122] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
[ 70.288592][ T1122] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10596) 
[ 70.288823][ T1122] ? __pfx___netdev_update_features (net/core/dev.c:10589) 
[ 70.289103][ T1122] ? _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) 
[ 70.289329][ T1122] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 70.289565][ T1122] register_netdevice (net/core/dev.c:11033) 
[ 70.289793][ T1122] ? __pfx_register_netdevice (net/core/dev.c:10911) 
[ 70.290007][ T1122] ? __debugfs_create_file (fs/debugfs/inode.c:466) 
[ 70.290241][ T1122] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 70.290489][ T1122] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 70.290766][ T1122] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 70.290937][ T1122] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 70.291233][ T1122] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 70.291521][ T1122] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[ 70.291803][ T1122] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[ 70.292035][ T1122] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[ 70.292318][ T1122] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[ 70.292550][ T1122] ? 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)) 
[ 70.292719][ T1122] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[ 70.292945][ T1122] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[ 70.293171][ T1122] __driver_probe_device (drivers/base/dd.c:800) 
[ 70.293392][ T1122] driver_probe_device (drivers/base/dd.c:830) 
[ 70.293621][ T1122] __device_attach_driver (drivers/base/dd.c:959) 
[ 70.293846][ T1122] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[ 70.294116][ T1122] bus_for_each_drv (drivers/base/bus.c:462) 
[ 70.294335][ T1122] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[ 70.294561][ T1122] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 70.294779][ T1122] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 70.294996][ T1122] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 70.295225][ T1122] __device_attach (drivers/base/dd.c:1030) 
[ 70.295452][ T1122] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[ 70.295674][ T1122] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 70.295897][ T1122] ? 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) 
[ 70.296121][ T1122] bus_probe_device (drivers/base/bus.c:537) 
[ 70.296341][ T1122] device_add (drivers/base/core.c:3672) 
[ 70.296572][ T1122] ? __pfx_device_add (drivers/base/core.c:3548) 
[ 70.296788][ T1122] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[ 70.297021][ T1122] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[ 70.297302][ T1122] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[ 70.297616][ T1122] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 70.297834][ T1122] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[ 70.298057][ T1122] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 70.298273][ T1122] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 70.298509][ T1122] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[ 70.298686][ T1122] ? __pfx_vfs_write (fs/read_write.c:660) 
[ 70.298907][ T1122] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 70.299123][ T1122] ? 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) 
[ 70.299350][ T1122] ? __pfx___up_read (kernel/locking/rwsem.c:1337) 
[ 70.299584][ T1122] ksys_write (fs/read_write.c:731) 
[ 70.299751][ T1122] ? __pfx_ksys_write (fs/read_write.c:721) 
[ 70.299966][ T1122] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[ 70.300200][ T1122] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 70.300430][ T1122] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   70.300701][ T1122] RIP: 0033:0x7f2e9caa6b77
[ 70.300928][ T1122] 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
[   70.301695][ T1122] RSP: 002b:00007fff5748cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   70.302029][ T1122] RAX: ffffffffffffffda RBX: 00007f2e9c88c140 RCX: 00007f2e9caa6b77
[   70.302353][ T1122] RDX: 0000000000000009 RSI: 000055a3606863c0 RDI: 0000000000000006
[   70.302691][ T1122] RBP: 0000000000000009 R08: 0000000000000000 R09: 0000000000000000
[   70.303018][ T1122] R10: 0000000000000002 R11: 0000000000000246 R12: 00007f2e8e944340
[   70.303349][ T1122] R13: 000055a3606863c0 R14: 0000000000000006 R15: 000055a36045d900
| [   73.454902][ T1122] ------------[ cut here ]------------
| [ 73.455313][ T1122] WARNING: CPU: 1 PID: 1122 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:10596) 
| [   73.455770][ T1122] Modules linked in: netdevsim psample bonding sch_etf sch_fq [last unloaded: test_bpf]
| [   73.456564][ T1122] Tainted: [W]=WARN
[   73.456745][ T1122] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 73.457017][ T1122] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
[ 73.457293][ T1122] Code: 00 e8 13 47 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 5f 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:	13 47 fe             	adc    -0x2(%rdi),%eax
   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 5f 99 00       	call   0x995fb9
  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
[   73.458225][ T1122] RSP: 0018:ffffc90001377528 EFLAGS: 00010246
[   73.458519][ T1122] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   73.458847][ T1122] RDX: 0000000000000000 RSI: ffff88800d3c2cd0 RDI: ffff888008a9ae38
[   73.459170][ T1122] RBP: ffffffffae053580 R08: 0000000000000000 R09: fffffbfff57c2504
[   73.459513][ T1122] R10: ffffffffabe12827 R11: ffff888008a9a300 R12: 0000000000000000
[   73.459837][ T1122] R13: ffff88800d3c2130 R14: ffff88800d3c2008 R15: ffff88800d3c2000
[   73.460163][ T1122] FS:  00007f2e9c88c1c0(0000) GS:ffff88806ce80000(0000) knlGS:0000000000000000
[   73.460571][ T1122] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   73.460844][ T1122] CR2: 00007f2e8f2cad60 CR3: 00000000094bc005 CR4: 0000000000772ef0
[   73.461173][ T1122] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   73.461505][ T1122] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   73.461825][ T1122] PKRU: 55555554
[   73.461994][ T1122] Call Trace:
[   73.462159][ T1122]  <TASK>
[ 73.462272][ T1122] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
[ 73.462502][ T1122] ? __warn (kernel/panic.c:748) 
[ 73.462674][ T1122] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
[ 73.462896][ T1122] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 73.463121][ T1122] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 73.463289][ T1122] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 73.463520][ T1122] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 73.463756][ T1122] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
[ 73.463978][ T1122] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10596) 
[ 73.464203][ T1122] ? __pfx___netdev_update_features (net/core/dev.c:10589) 
[ 73.464491][ T1122] ? _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) 
[ 73.464725][ T1122] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 73.464958][ T1122] register_netdevice (net/core/dev.c:11033) 
[ 73.465184][ T1122] ? __pfx_register_netdevice (net/core/dev.c:10911) 
[ 73.465400][ T1122] ? __debugfs_create_file (fs/debugfs/inode.c:466) 
[ 73.465670][ T1122] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 73.465911][ T1122] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 73.466190][ T1122] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 73.466363][ T1122] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 73.466658][ T1122] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 73.466939][ T1122] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[ 73.467221][ T1122] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[ 73.467470][ T1122] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[ 73.467753][ T1122] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[ 73.467978][ T1122] ? 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)) 
[ 73.468147][ T1122] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[ 73.468377][ T1122] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[ 73.468614][ T1122] __driver_probe_device (drivers/base/dd.c:800) 
[ 73.468868][ T1122] driver_probe_device (drivers/base/dd.c:830) 
[ 73.469088][ T1122] __device_attach_driver (drivers/base/dd.c:959) 
[ 73.469311][ T1122] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[ 73.469590][ T1122] bus_for_each_drv (drivers/base/bus.c:462) 
[ 73.469811][ T1122] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[ 73.470026][ T1122] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 73.470244][ T1122] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 73.470475][ T1122] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 73.470699][ T1122] __device_attach (drivers/base/dd.c:1030) 
[ 73.470917][ T1122] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[ 73.471135][ T1122] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 73.471355][ T1122] ? 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) 
[ 73.471591][ T1122] bus_probe_device (drivers/base/bus.c:537) 
[ 73.471813][ T1122] device_add (drivers/base/core.c:3672) 
[ 73.472036][ T1122] ? __pfx_device_add (drivers/base/core.c:3548) 
[ 73.472258][ T1122] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[ 73.472502][ T1122] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[ 73.472791][ T1122] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[ 73.473074][ T1122] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 73.473291][ T1122] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[ 73.473528][ T1122] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 73.473748][ T1122] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 73.473973][ T1122] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[ 73.474148][ T1122] ? __pfx_vfs_write (fs/read_write.c:660) 
[ 73.474365][ T1122] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 73.474606][ T1122] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:885) 
[ 73.474889][ T1122] ksys_write (fs/read_write.c:731) 
[ 73.475058][ T1122] ? __pfx_ksys_write (fs/read_write.c:721) 
[ 73.475278][ T1122] ? kernfs_fop_llseek (fs/kernfs/file.c:891) 
[ 73.475523][ T1122] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 73.475753][ T1122] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   73.476024][ T1122] RIP: 0033:0x7f2e9caa6b77
[ 73.476250][ T1122] 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
[   73.477010][ T1122] RSP: 002b:00007fff5748cd18 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   73.477338][ T1122] RAX: ffffffffffffffda RBX: 00007f2e9c88c140 RCX: 00007f2e9caa6b77
[   73.477671][ T1122] RDX: 000000000000000b RSI: 000055a36068a2d0 RDI: 0000000000000006
[   73.477993][ T1122] RBP: 000000000000000b R08: 0000000000000000 R09: 0000000000000000
[   73.478319][ T1122] R10: 0000000000000002 R11: 0000000000000246 R12: 00007f2e8e7ce280
[   73.478650][ T1122] R13: 000055a36068a2d0 R14: 0000000000000006 R15: 000055a36045d900
| [   77.517088][ T1122] ------------[ cut here ]------------
| [ 77.517586][ T1122] WARNING: CPU: 0 PID: 1122 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:10596) 
| [   77.518221][ T1122] Modules linked in: netdevsim psample bonding sch_etf sch_fq [last unloaded: test_bpf]
| [   77.519012][ T1122] Tainted: [W]=WARN
[   77.519177][ T1122] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 77.519458][ T1122] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
[ 77.519743][ T1122] Code: 00 e8 13 47 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 5f 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:	13 47 fe             	adc    -0x2(%rdi),%eax
   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 5f 99 00       	call   0x995fb9
  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
[   77.520535][ T1122] RSP: 0018:ffffc90001377528 EFLAGS: 00010246
[   77.520810][ T1122] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   77.521132][ T1122] RDX: 0000000000000000 RSI: ffff88800d2d2cd0 RDI: ffff888008a9ae38
[   77.521470][ T1122] RBP: ffffffffae053580 R08: 0000000000000000 R09: fffffbfff57c2504
[   77.521790][ T1122] R10: ffffffffabe12827 R11: ffff888008a9a300 R12: 0000000000000000
[   77.522110][ T1122] R13: ffff88800d2d2130 R14: ffff88800d2d2008 R15: ffff88800d2d2000
[   77.522444][ T1122] FS:  00007f2e9c88c1c0(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
[   77.522821][ T1122] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   77.523104][ T1122] CR2: 000055a360487900 CR3: 00000000094bc004 CR4: 0000000000772ef0
[   77.523440][ T1122] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   77.523762][ T1122] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   77.524082][ T1122] PKRU: 55555554
[   77.524246][ T1122] Call Trace:
[   77.524420][ T1122]  <TASK>
[ 77.524536][ T1122] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
[ 77.524754][ T1122] ? __warn (kernel/panic.c:748) 
[ 77.524920][ T1122] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
[ 77.525140][ T1122] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 77.525365][ T1122] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 77.525547][ T1122] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 77.525789][ T1122] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 77.526021][ T1122] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10596) 
[ 77.526259][ T1122] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10596) 
[ 77.526495][ T1122] ? __pfx___netdev_update_features (net/core/dev.c:10589) 
[ 77.526776][ T1122] ? _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) 
[ 77.527001][ T1122] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 77.527229][ T1122] register_netdevice (net/core/dev.c:11033) 
[ 77.527468][ T1122] ? __pfx_register_netdevice (net/core/dev.c:10911) 
[ 77.527683][ T1122] ? __debugfs_create_file (fs/debugfs/inode.c:466) 
[ 77.527915][ T1122] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 77.528147][ T1122] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 77.528436][ T1122] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 77.528608][ T1122] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 77.528893][ T1122] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 77.529172][ T1122] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[ 77.529463][ T1122] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[ 77.529696][ T1122] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[ 77.529970][ T1122] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[ 77.530186][ T1122] ? 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)) 
[ 77.530355][ T1122] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[ 77.530597][ T1122] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[ 77.530823][ T1122] __driver_probe_device (drivers/base/dd.c:800) 
[ 77.531043][ T1122] driver_probe_device (drivers/base/dd.c:830) 
[ 77.531263][ T1122] __device_attach_driver (drivers/base/dd.c:959) 
[ 77.531497][ T1122] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[ 77.531764][ T1122] bus_for_each_drv (drivers/base/bus.c:462) 
[ 77.531984][ T1122] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[ 77.532201][ T1122] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 77.532442][ T1122] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 77.532658][ T1122] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 77.532881][ T1122] __device_attach (drivers/base/dd.c:1030) 
[ 77.533102][ T1122] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[ 77.533321][ T1122] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 77.533546][ T1122] ? 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) 
[ 77.533772][ T1122] bus_probe_device (drivers/base/bus.c:537) 
[ 77.533997][ T1122] device_add (drivers/base/core.c:3672) 
[ 77.534223][ T1122] ? __pfx_device_add (drivers/base/core.c:3548) 
[ 77.534447][ T1122] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[ 77.534679][ T1122] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[ 77.534961][ T1122] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[ 77.535248][ T1122] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 77.535481][ T1122] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[ 77.535717][ T1122] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 77.535932][ T1122] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 77.536158][ T1122] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[ 77.536336][ T1122] ? __pfx_vfs_write (fs/read_write.c:660) 
[ 77.536566][ T1122] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 77.536800][ T1122] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:885) 
[ 77.537083][ T1122] ksys_write (fs/read_write.c:731) 
[ 77.537254][ T1122] ? __pfx_ksys_write (fs/read_write.c:721) 
[ 77.537481][ T1122] ? kernfs_fop_llseek (fs/kernfs/file.c:891) 
[ 77.537708][ T1122] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 77.537934][ T1122] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   77.538200][ T1122] RIP: 0033:0x7f2e9caa6b77
[ 77.538444][ T1122] 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
[   77.539210][ T1122] RSP: 002b:00007fff5748cd18 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   77.539550][ T1122] RAX: ffffffffffffffda RBX: 00007f2e9c88c140 RCX: 00007f2e9caa6b77
[   77.539875][ T1122] RDX: 0000000000000007 RSI: 000055a36068a2d0 RDI: 0000000000000006
[   77.540195][ T1122] RBP: 0000000000000007 R08: 0000000000000000 R09: 0000000000000000
[   77.540525][ T1122] R10: 0000000000000002 R11: 0000000000000246 R12: 00007f2e8e7ce280


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