======================================
| 0
| xx__-> [ 4494.817739][T20882] ------------[ cut here ]------------
| [4494.818141][T20882] WARNING: CPU: 0 PID: 20882 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) 
| [ 4494.818666][T20882] Modules linked in: netdevsim psample pktgen nft_chain_nat xt_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip6t_REJECT ipt_REJECT nft_compat nf_tables
[ 4494.819884][T20882] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[4494.820202][T20882] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 4494.820527][T20882] 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
[ 4494.821402][T20882] RSP: 0018:ffffc900007b7528 EFLAGS: 00010246
[ 4494.821719][T20882] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[ 4494.822096][T20882] RDX: 0000000000000000 RSI: ffff888011a22cd0 RDI: ffff88800b6cd0f8
[ 4494.822499][T20882] RBP: ffffffffbba53580 R08: 0000000000000000 R09: fffffbfff7302504
[ 4494.822882][T20882] R10: ffffffffb9812827 R11: ffff88800b6cc5c0 R12: 0000000000000000
[ 4494.823232][T20882] R13: ffff888011a22130 R14: ffff888011a22008 R15: ffff888011a22000
[ 4494.823728][T20882] FS:  00007f2079c381c0(0000) GS:ffff888065a00000(0000) knlGS:0000000000000000
[ 4494.824146][T20882] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 4494.824455][T20882] CR2: 00007f206c605bd0 CR3: 000000000c438001 CR4: 0000000000772ef0
[ 4494.824818][T20882] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 4494.825174][T20882] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 4494.825536][T20882] PKRU: 55555554
[ 4494.825728][T20882] Call Trace:
[ 4494.825923][T20882]  <TASK>
[4494.826058][T20882] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[4494.826322][T20882] ? __warn (kernel/panic.c:748) 
[4494.826507][T20882] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[4494.826742][T20882] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[4494.826983][T20882] ? handle_bug (arch/x86/kernel/traps.c:285) 
[4494.827163][T20882] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[4494.827414][T20882] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[4494.827672][T20882] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[4494.827912][T20882] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10566) 
[4494.828154][T20882] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[4494.828468][T20882] ? _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) 
[4494.828714][T20882] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[4494.828952][T20882] register_netdevice (net/core/dev.c:11003) 
[4494.829204][T20882] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[4494.829448][T20882] ? __debugfs_create_file (fs/debugfs/inode.c:466) 
[4494.829699][T20882] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[4494.829950][T20882] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[4494.830253][T20882] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[4494.830486][T20882] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[4494.830833][T20882] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[4494.831164][T20882] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[4494.831498][T20882] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[4494.831764][T20882] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[4494.832061][T20882] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[4494.832321][T20882] ? 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)) 
[4494.832503][T20882] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[4494.832780][T20882] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[4494.833027][T20882] __driver_probe_device (drivers/base/dd.c:800) 
[4494.833267][T20882] driver_probe_device (drivers/base/dd.c:830) 
[4494.833522][T20882] __device_attach_driver (drivers/base/dd.c:959) 
[4494.833762][T20882] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[4494.834062][T20882] bus_for_each_drv (drivers/base/bus.c:462) 
[4494.834311][T20882] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[4494.834555][T20882] ? bus_to_subsys (drivers/base/bus.c:85) 
[4494.834791][T20882] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[4494.835025][T20882] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[4494.835268][T20882] __device_attach (drivers/base/dd.c:1030) 
[4494.835538][T20882] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[4494.835778][T20882] ? bus_to_subsys (drivers/base/bus.c:85) 
[4494.836012][T20882] ? 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) 
[4494.836261][T20882] bus_probe_device (drivers/base/bus.c:537) 
[4494.836516][T20882] device_add (drivers/base/core.c:3672) 
[4494.836756][T20882] ? __pfx_device_add (drivers/base/core.c:3548) 
[4494.836991][T20882] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[4494.837241][T20882] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[4494.837559][T20882] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[4494.837867][T20882] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[4494.838110][T20882] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[4494.838363][T20882] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[4494.838600][T20882] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[4494.838842][T20882] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[4494.839031][T20882] ? __pfx_vfs_write (fs/read_write.c:660) 
[4494.839269][T20882] ? __lock_release (kernel/locking/lockdep.c:5527) 
[4494.839522][T20882] ? 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) 
[4494.839775][T20882] ? __pfx___up_read (kernel/locking/rwsem.c:1337) 
[4494.840018][T20882] ksys_write (fs/read_write.c:731) 
[4494.840197][T20882] ? __pfx_ksys_write (fs/read_write.c:721) 
[4494.840444][T20882] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[4494.840701][T20882] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[4494.840923][T20882] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 4494.841203][T20882] RIP: 0033:0x7f2079e52b77
[ 4494.841462][T20882] 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
[ 4494.842309][T20882] RSP: 002b:00007ffc4e355b68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[ 4494.842671][T20882] RAX: ffffffffffffffda RBX: 00007f2079c38140 RCX: 00007f2079e52b77
[ 4494.843027][T20882] RDX: 0000000000000009 RSI: 00005562721921a0 RDI: 0000000000000006
[ 4494.843408][T20882] RBP: 0000000000000009 R08: 0000000000000000 R09: 0000000000000000
[ 4494.843761][T20882] R10: 0000000000000002 R11: 0000000000000246 R12: 00007f206bcf0340
[ 4494.844120][T20882] R13: 00005562721921a0 R14: 0000000000000006 R15: 0000556271f69900
| [ 4498.054757][T20882] ------------[ cut here ]------------
| [4498.055191][T20882] WARNING: CPU: 2 PID: 20882 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) 
| [ 4498.055658][T20882] Modules linked in: netdevsim psample pktgen nft_chain_nat xt_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip6t_REJECT ipt_REJECT nft_compat nf_tables
| [ 4498.056769][T20882] Tainted: [W]=WARN
[ 4498.056979][T20882] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[4498.057257][T20882] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 4498.057563][T20882] 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
[ 4498.058311][T20882] RSP: 0018:ffffc900007b7528 EFLAGS: 00010246
[ 4498.058913][T20882] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[ 4498.059273][T20882] RDX: 0000000000000000 RSI: ffff88800c31acd0 RDI: ffff88800b6cd0f8
[ 4498.059635][T20882] RBP: ffffffffbba53580 R08: 0000000000000000 R09: fffffbfff7302504
[ 4498.059991][T20882] R10: ffffffffb9812827 R11: ffff88800b6cc5c0 R12: 0000000000000000
[ 4498.060348][T20882] R13: ffff88800c31a130 R14: ffff88800c31a008 R15: ffff88800c31a000
[ 4498.060682][T20882] FS:  00007f2079c381c0(0000) GS:ffff888065b00000(0000) knlGS:0000000000000000
[ 4498.061061][T20882] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 4498.061448][T20882] CR2: 00007fa148302000 CR3: 000000000c438005 CR4: 0000000000772ef0
[ 4498.061872][T20882] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 4498.062373][T20882] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 4498.062727][T20882] PKRU: 55555554
[ 4498.062913][T20882] Call Trace:
[ 4498.063085][T20882]  <TASK>
[4498.063207][T20882] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[4498.063445][T20882] ? __warn (kernel/panic.c:748) 
[4498.063629][T20882] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[4498.063852][T20882] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[4498.064094][T20882] ? handle_bug (arch/x86/kernel/traps.c:285) 
[4498.064267][T20882] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[4498.064504][T20882] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[4498.064743][T20882] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[4498.064968][T20882] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10566) 
[4498.065195][T20882] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[4498.065487][T20882] ? _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) 
[4498.065722][T20882] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[4498.065958][T20882] register_netdevice (net/core/dev.c:11003) 
[4498.066189][T20882] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[4498.066424][T20882] ? __debugfs_create_file (fs/debugfs/inode.c:466) 
[4498.066663][T20882] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[4498.066909][T20882] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[4498.067193][T20882] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[4498.067388][T20882] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[4498.067680][T20882] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[4498.067959][T20882] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[4498.068245][T20882] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[4498.068493][T20882] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[4498.068773][T20882] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[4498.068999][T20882] ? 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)) 
[4498.069171][T20882] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[4498.069421][T20882] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[4498.069655][T20882] __driver_probe_device (drivers/base/dd.c:800) 
[4498.069880][T20882] driver_probe_device (drivers/base/dd.c:830) 
[4498.070102][T20882] __device_attach_driver (drivers/base/dd.c:959) 
[4498.070336][T20882] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[4498.070614][T20882] bus_for_each_drv (drivers/base/bus.c:462) 
[4498.070835][T20882] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[4498.071055][T20882] ? bus_to_subsys (drivers/base/bus.c:85) 
[4498.071274][T20882] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[4498.071508][T20882] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[4498.071735][T20882] __device_attach (drivers/base/dd.c:1030) 
[4498.071957][T20882] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[4498.072209][T20882] ? bus_to_subsys (drivers/base/bus.c:85) 
[4498.072444][T20882] ? 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) 
[4498.072685][T20882] bus_probe_device (drivers/base/bus.c:537) 
[4498.072915][T20882] device_add (drivers/base/core.c:3672) 
[4498.073138][T20882] ? __pfx_device_add (drivers/base/core.c:3548) 
[4498.073372][T20882] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[4498.073608][T20882] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[4498.073893][T20882] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[4498.074186][T20882] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[4498.074418][T20882] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[4498.074650][T20882] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[4498.074870][T20882] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[4498.075096][T20882] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[4498.075276][T20882] ? __pfx_vfs_write (fs/read_write.c:660) 
[4498.075513][T20882] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[4498.075748][T20882] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:885) 
[4498.076028][T20882] ksys_write (fs/read_write.c:731) 
[4498.076198][T20882] ? __pfx_ksys_write (fs/read_write.c:721) 
[4498.076428][T20882] ? kernfs_fop_llseek (fs/kernfs/file.c:891) 
[4498.076661][T20882] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[4498.076882][T20882] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 4498.077152][T20882] RIP: 0033:0x7f2079e52b77
[ 4498.077412][T20882] 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
[ 4498.078190][T20882] RSP: 002b:00007ffc4e355c08 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[ 4498.078547][T20882] RAX: ffffffffffffffda RBX: 00007f2079c38140 RCX: 00007f2079e52b77
[ 4498.078891][T20882] RDX: 000000000000000a RSI: 00005562721960b0 RDI: 0000000000000006
[ 4498.079231][T20882] RBP: 000000000000000a R08: 0000000000000000 R09: 0000000000000000
[ 4498.079566][T20882] R10: 0000000000000002 R11: 0000000000000246 R12: 00007f206bb7a280
[ 4498.079901][T20882] R13: 00005562721960b0 R14: 0000000000000006 R15: 0000556271f69900
| [ 4500.576972][T20882] ------------[ cut here ]------------
| [4500.577475][T20882] WARNING: CPU: 1 PID: 20882 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) 
| [ 4500.577900][T20882] Modules linked in: netdevsim psample pktgen nft_chain_nat xt_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip6t_REJECT ipt_REJECT nft_compat nf_tables
| [ 4500.579021][T20882] Tainted: [W]=WARN
[ 4500.579192][T20882] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[4500.579479][T20882] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 4500.579749][T20882] 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
[ 4500.580488][T20882] RSP: 0018:ffffc900007b7528 EFLAGS: 00010246
[ 4500.580757][T20882] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[ 4500.581085][T20882] RDX: 0000000000000000 RSI: ffff88801427acd0 RDI: ffff88800b6cd0f8
[ 4500.581406][T20882] RBP: ffffffffbba53580 R08: 0000000000000000 R09: fffffbfff7302504
[ 4500.581723][T20882] R10: ffffffffb9812827 R11: ffff88800b6cc5c0 R12: 0000000000000000
[ 4500.582035][T20882] R13: ffff88801427a130 R14: ffff88801427a008 R15: ffff88801427a000
[ 4500.582365][T20882] FS:  00007f2079c381c0(0000) GS:ffff888065a80000(0000) knlGS:0000000000000000
[ 4500.582745][T20882] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 4500.583009][T20882] CR2: 00007fbecc4175a0 CR3: 000000000c438004 CR4: 0000000000772ef0
[ 4500.583352][T20882] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 4500.583679][T20882] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 4500.584018][T20882] PKRU: 55555554
[ 4500.584179][T20882] Call Trace:
[ 4500.584357][T20882]  <TASK>
[4500.584473][T20882] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[4500.584696][T20882] ? __warn (kernel/panic.c:748) 
[4500.584868][T20882] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[4500.585089][T20882] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[4500.585323][T20882] ? handle_bug (arch/x86/kernel/traps.c:285) 
[4500.585492][T20882] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[4500.585700][T20882] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[4500.585928][T20882] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[4500.586139][T20882] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10566) 
[4500.586361][T20882] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[4500.586626][T20882] ? _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) 
[4500.586842][T20882] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[4500.587057][T20882] register_netdevice (net/core/dev.c:11003) 
[4500.587269][T20882] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[4500.587482][T20882] ? __debugfs_create_file (fs/debugfs/inode.c:466) 
[4500.587714][T20882] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[4500.587954][T20882] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[4500.588240][T20882] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[4500.588423][T20882] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[4500.588717][T20882] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[4500.588992][T20882] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[4500.589260][T20882] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[4500.589495][T20882] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[4500.589761][T20882] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[4500.589975][T20882] ? 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)) 
[4500.590133][T20882] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[4500.590363][T20882] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[4500.590588][T20882] __driver_probe_device (drivers/base/dd.c:800) 
[4500.590803][T20882] driver_probe_device (drivers/base/dd.c:830) 
[4500.591013][T20882] __device_attach_driver (drivers/base/dd.c:959) 
[4500.591223][T20882] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[4500.591488][T20882] bus_for_each_drv (drivers/base/bus.c:462) 
[4500.591699][T20882] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[4500.591914][T20882] ? bus_to_subsys (drivers/base/bus.c:85) 
[4500.592134][T20882] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[4500.592358][T20882] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[4500.592589][T20882] __device_attach (drivers/base/dd.c:1030) 
[4500.592814][T20882] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[4500.593033][T20882] ? bus_to_subsys (drivers/base/bus.c:85) 
[4500.593262][T20882] ? 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) 
[4500.593504][T20882] bus_probe_device (drivers/base/bus.c:537) 
[4500.593724][T20882] device_add (drivers/base/core.c:3672) 
[4500.593943][T20882] ? __pfx_device_add (drivers/base/core.c:3548) 
[4500.594167][T20882] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[4500.594411][T20882] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[4500.594689][T20882] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[4500.594958][T20882] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[4500.595168][T20882] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[4500.595390][T20882] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[4500.595601][T20882] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[4500.595814][T20882] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[4500.595981][T20882] ? __pfx_vfs_write (fs/read_write.c:660) 
[4500.596186][T20882] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[4500.596416][T20882] ? __pfx___mutex_unlock_slowpath (kernel/locking/mutex.c:885) 
[4500.596699][T20882] ksys_write (fs/read_write.c:731) 
[4500.596870][T20882] ? __pfx_ksys_write (fs/read_write.c:721) 
[4500.597093][T20882] ? kernfs_fop_llseek (fs/kernfs/file.c:891) 
[4500.597319][T20882] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[4500.597529][T20882] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 4500.597782][T20882] RIP: 0033:0x7f2079e52b77
[ 4500.598002][T20882] 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
[ 4500.598788][T20882] RSP: 002b:00007ffc4e355c08 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[ 4500.599119][T20882] RAX: ffffffffffffffda RBX: 00007f2079c38140 RCX: 00007f2079e52b77
[ 4500.599431][T20882] RDX: 0000000000000009 RSI: 00005562721960b0 RDI: 0000000000000006
[ 4500.599739][T20882] RBP: 0000000000000009 R08: 0000000000000000 R09: 0000000000000000
[ 4500.600069][T20882] R10: 0000000000000002 R11: 0000000000000246 R12: 00007f206bb7a280


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