======================================
| 0
| xx__-> [    9.773208][  T227] ------------[ cut here ]------------
| [ 9.773739][ T227] WARNING: CPU: 2 PID: 227 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) 
| [    9.774195][  T227] Modules linked in: netdevsim
[    9.774805][  T227] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 9.775087][ T227] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 9.775485][ T227] Code: 00 e8 a3 4a fe ff 48 8b 5c 24 58 e9 87 fb ff ff 49 8d bf 98 0c 00 00 be ff ff ff ff e8 d8 33 78 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:	a3 4a fe ff 48 8b 5c 	movabs %eax,0x58245c8b48fffe4a
   9:	24 58 
   b:	e9 87 fb ff ff       	jmp    0xfffffffffffffb97
  10:	49 8d bf 98 0c 00 00 	lea    0xc98(%r15),%rdi
  17:	be ff ff ff ff       	mov    $0xffffffff,%esi
  1c:	e8 d8 33 78 00       	call   0x7833f9
  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
[    9.776244][  T227] RSP: 0018:ffffc90000aa7520 EFLAGS: 00010246
[    9.776522][  T227] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[    9.776847][  T227] RDX: 0000000000000000 RSI: ffff88800bbcac98 RDI: ffff8880091dae38
[    9.777180][  T227] RBP: ffffffff88f23440 R08: 0000000000000000 R09: fffffbfff0dbd83c
[    9.777502][  T227] R10: ffffffff86dec1e7 R11: ffff8880091da300 R12: 0000000000000000
[    9.777829][  T227] R13: ffff88800bbca128 R14: ffff88800bbca008 R15: ffff88800bbca000
[    9.778167][  T227] FS:  00007f31b6006740(0000) GS:ffff888036100000(0000) knlGS:0000000000000000
[    9.778546][  T227] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.778824][  T227] CR2: 00005569a47644c8 CR3: 000000000adb8005 CR4: 0000000000772ef0
[    9.779234][  T227] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    9.779567][  T227] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    9.779892][  T227] PKRU: 55555554
[    9.780077][  T227] Call Trace:
[    9.780262][  T227]  <TASK>
[ 9.780389][ T227] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 9.780615][ T227] ? __warn (kernel/panic.c:748) 
[ 9.780790][ T227] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 9.781013][ T227] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 9.781249][ T227] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 9.781424][ T227] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 9.781643][ T227] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 9.781875][ T227] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 9.782106][ T227] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 9.782395][ T227] ? _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) 
[ 9.782632][ T227] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 9.782857][ T227] register_netdevice (net/core/dev.c:11003) 
[ 9.783096][ T227] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 9.783340][ T227] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 9.783577][ T227] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 9.783854][ T227] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 9.784031][ T227] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 9.784328][ T227] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 9.784610][ T227] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[ 9.784889][ T227] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[ 9.785125][ T227] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[ 9.785415][ T227] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[ 9.785640][ T227] ? 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)) 
[ 9.785811][ T227] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[ 9.786044][ T227] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[ 9.786281][ T227] __driver_probe_device (drivers/base/dd.c:800) 
[ 9.786506][ T227] driver_probe_device (drivers/base/dd.c:830) 
[ 9.786725][ T227] __device_attach_driver (drivers/base/dd.c:959) 
[ 9.786948][ T227] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[ 9.787236][ T227] bus_for_each_drv (drivers/base/bus.c:462) 
[ 9.787460][ T227] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[ 9.787678][ T227] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 9.787904][ T227] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 9.788124][ T227] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 9.788364][ T227] __device_attach (drivers/base/dd.c:1030) 
[ 9.788585][ T227] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[ 9.788805][ T227] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 9.789032][ T227] ? 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) 
[ 9.789274][ T227] bus_probe_device (drivers/base/bus.c:537) 
[ 9.789506][ T227] device_add (drivers/base/core.c:3672) 
[ 9.789732][ T227] ? __pfx_device_add (drivers/base/core.c:3548) 
[ 9.789958][ T227] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[ 9.790199][ T227] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[ 9.790480][ T227] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[ 9.790764][ T227] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 9.790987][ T227] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[ 9.791224][ T227] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 9.791445][ T227] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 9.791674][ T227] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[ 9.791854][ T227] ? __pfx_vfs_write (fs/read_write.c:660) 
[ 9.792079][ T227] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 9.792303][ T227] ? 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) 
[ 9.792533][ T227] ? __pfx___up_read (kernel/locking/rwsem.c:1337) 
[ 9.792762][ T227] ksys_write (fs/read_write.c:731) 
[ 9.792935][ T227] ? __pfx_ksys_write (fs/read_write.c:721) 
[ 9.793167][ T227] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[ 9.793399][ T227] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 9.793622][ T227] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[    9.793890][  T227] RIP: 0033:0x7f31b6147b77
[ 9.794117][ T227] 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
[    9.794857][  T227] RSP: 002b:00007ffe54bc0708 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[    9.795196][  T227] RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 00007f31b6147b77
[    9.795529][  T227] RDX: 0000000000000007 RSI: 00005569a47634c0 RDI: 0000000000000001
[    9.795850][  T227] RBP: 00005569a47634c0 R08: 0000000000000003 R09: 0000000000000077
[    9.796186][  T227] R10: 0000000000000063 R11: 0000000000000246 R12: 0000000000000007
[    9.796520][  T227] R13: 00007f31b6203760 R14: 0000000000000007 R15: 00007f31b61fe9c0
| [   10.052033][  T256] ------------[ cut here ]------------
| [ 10.052617][ T256] WARNING: CPU: 0 PID: 256 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) 
| [   10.052994][  T256] Modules linked in: netdevsim
| [   10.053625][  T256] Tainted: [W]=WARN
[   10.053782][  T256] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 10.054017][ T256] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.054267][ T256] Code: 00 e8 a3 4a fe ff 48 8b 5c 24 58 e9 87 fb ff ff 49 8d bf 98 0c 00 00 be ff ff ff ff e8 d8 33 78 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:	a3 4a fe ff 48 8b 5c 	movabs %eax,0x58245c8b48fffe4a
   9:	24 58 
   b:	e9 87 fb ff ff       	jmp    0xfffffffffffffb97
  10:	49 8d bf 98 0c 00 00 	lea    0xc98(%r15),%rdi
  17:	be ff ff ff ff       	mov    $0xffffffff,%esi
  1c:	e8 d8 33 78 00       	call   0x7833f9
  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
[   10.054929][  T256] RSP: 0018:ffffc900005271e8 EFLAGS: 00010246
[   10.055181][  T256] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   10.055464][  T256] RDX: 0000000000000000 RSI: ffff88800dda2c98 RDI: ffff88800b425080
[   10.055743][  T256] RBP: ffff88800dd10040 R08: 0000000000000000 R09: fffffbfff0dbd83c
[   10.056024][  T256] R10: ffffffff86dec1e7 R11: ffff88800b4245c0 R12: 0000000000000000
[   10.056311][  T256] R13: ffff88800dda2128 R14: ffff88800dda2008 R15: ffff88800dda2000
[   10.056595][  T256] FS:  00007f6d3014f800(0000) GS:ffff888036000000(0000) knlGS:0000000000000000
[   10.056918][  T256] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   10.057176][  T256] CR2: 00007f6d30290290 CR3: 000000000dcc0005 CR4: 0000000000772ef0
[   10.057459][  T256] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   10.057741][  T256] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   10.058018][  T256] PKRU: 55555554
[   10.058170][  T256] Call Trace:
[   10.058313][  T256]  <TASK>
[ 10.058415][ T256] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.058603][ T256] ? __warn (kernel/panic.c:748) 
[ 10.058749][ T256] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.058946][ T256] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 10.059140][ T256] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 10.059295][ T256] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 10.059492][ T256] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 10.059695][ T256] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.059892][ T256] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10566) 
[ 10.060085][ T256] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 10.060332][ T256] ? _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) 
[ 10.060527][ T256] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 10.060722][ T256] register_netdevice (net/core/dev.c:11003) 
[ 10.060915][ T256] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 10.061116][ T256] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 10.061329][ T256] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 10.061573][ T256] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 10.061821][ T256] ? nsim_dev_hwstats_init (./include/linux/workqueue.h:817 drivers/net/netdevsim/hwstats.c:442) netdevsim 
[ 10.062068][ T256] nsim_dev_reload_create (drivers/net/netdevsim/dev.c:1450 drivers/net/netdevsim/dev.c:1501) netdevsim 
[ 10.062320][ T256] ? __pfx_nsim_dev_reload_create (drivers/net/netdevsim/dev.c:1462) netdevsim 
[ 10.062561][ T256] ? devlink_params_driverinit_load_new (net/devlink/param.c:833 (discriminator 2)) 
[ 10.062808][ T256] devlink_reload (net/devlink/dev.c:474) 
[ 10.063000][ T256] ? __pfx_devlink_reload (net/devlink/dev.c:446) 
[ 10.063197][ T256] ? trace_cap_capable (./include/trace/events/capability.h:26 (discriminator 21)) 
[ 10.063394][ T256] ? cap_capable (security/commoncap.c:131) 
[ 10.063583][ T256] ? fdget (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1146 fs/file.c:1160) 
[ 10.063742][ T256] devlink_nl_reload_doit (net/devlink/dev.c:584) 
[ 10.063935][ T256] ? __pfx_devlink_nl_reload_doit (net/devlink/dev.c:520) 
[ 10.064183][ T256] ? __nla_parse (lib/nlattr.c:732) 
[ 10.064381][ T256] genl_family_rcv_msg_doit (net/netlink/genetlink.c:1115) 
[ 10.064574][ T256] ? __pfx_genl_family_rcv_msg_doit (net/netlink/genetlink.c:1088) 
[ 10.064821][ T256] ? cap_capable (security/commoncap.c:131) 
[ 10.065008][ T256] ? validate_chain (kernel/locking/lockdep.c:3799 kernel/locking/lockdep.c:3819 kernel/locking/lockdep.c:3874) 
[ 10.065214][ T256] genl_family_rcv_msg (net/netlink/genetlink.c:1195) 
[ 10.065410][ T256] ? __pfx_genl_family_rcv_msg (net/netlink/genetlink.c:1160) 
[ 10.065599][ T256] ? __pfx_devlink_nl_pre_doit_dev_lock (net/devlink/netlink.c:257) 
[ 10.065828][ T256] ? __pfx_devlink_nl_reload_doit (net/devlink/dev.c:520) 
[ 10.066058][ T256] ? __pfx_devlink_nl_post_doit_dev_lock (net/devlink/netlink.c:288) 
[ 10.066313][ T256] genl_rcv_msg (net/netlink/genetlink.c:65 net/netlink/genetlink.c:1211) 
[ 10.066505][ T256] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[ 10.066692][ T256] ? __pfx_genl_rcv_msg (net/netlink/genetlink.c:1201) 
[ 10.066889][ T256] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[ 10.067092][ T256] ? genl_rcv (net/netlink/genetlink.c:1219) 
[ 10.067249][ T256] ? __pfx_down_read (kernel/locking/rwsem.c:1522) 
[ 10.067440][ T256] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) 
[ 10.067638][ T256] genl_rcv (net/netlink/genetlink.c:1220) 
[ 10.067781][ T256] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[ 10.067973][ T256] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[ 10.068175][ T256] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 10.068376][ T256] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[ 10.068568][ T256] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[ 10.068752][ T256] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 10.068942][ T256] ? __might_fault (mm/memory.c:6851 mm/memory.c:6844) 
[ 10.069138][ T256] __sys_sendto (net/socket.c:709 net/socket.c:724 net/socket.c:2178) 
[ 10.069339][ T256] ? __pfx___sys_sendto (net/socket.c:2145) 
[ 10.069533][ T256] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 10.069723][ T256] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 21)) 
[ 10.069925][ T256] ? rseq_update_cpu_node_id (kernel/rseq.c:188 (discriminator 10)) 
[ 10.070125][ T256] ? __rseq_handle_notify_resume (kernel/rseq.c:420) 
[ 10.070369][ T256] ? __pfx___rseq_handle_notify_resume (kernel/rseq.c:403) 
[ 10.070610][ T256] ? __pfx___x64_sys_openat (fs/open.c:1454) 
[ 10.070805][ T256] __x64_sys_sendto (net/socket.c:2181) 
[ 10.070990][ T256] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 10.071231][ T256] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 10.071420][ T256] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   10.071654][  T256] RIP: 0033:0x7f6d3035ba4a
[ 10.071848][ T256] Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3 0f 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 15 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 7e c3 0f 1f 44 00 00 41 54 48 83 ec 30 44 89
All code
========
   0:	d8 64 89 02          	fsubs  0x2(%rcx,%rcx,4)
   4:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   b:	eb b8                	jmp    0xffffffffffffffc5
   d:	0f 1f 00             	nopl   (%rax)
  10:	f3 0f 1e fa          	endbr64
  14:	41 89 ca             	mov    %ecx,%r10d
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 15                	jne    0x38
  23:	b8 2c 00 00 00       	mov    $0x2c,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 7e                	ja     0xb0
  32:	c3                   	ret
  33:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  38:	41 54                	push   %r12
  3a:	48 83 ec 30          	sub    $0x30,%rsp
  3e:	44                   	rex.R
  3f:	89                   	.byte 0x89

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 7e                	ja     0x86
   8:	c3                   	ret
   9:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
   e:	41 54                	push   %r12
  10:	48 83 ec 30          	sub    $0x30,%rsp
  14:	44                   	rex.R
  15:	89                   	.byte 0x89
[   10.072509][  T256] RSP: 002b:00007ffd4dc14428 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[   10.072796][  T256] RAX: ffffffffffffffda RBX: 00000000078c5b00 RCX: 00007f6d3035ba4a
[   10.073074][  T256] RDX: 0000000000000040 RSI: 00000000078c5b00 RDI: 0000000000000005
[   10.073361][  T256] RBP: 00000000078c5910 R08: 00007f6d304ff200 R09: 000000000000000c
[   10.073637][  T256] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000040f200
[   10.073916][  T256] R13: 00000000078c5910 R14: 0000000000000000 R15: 0000000000000001
| [   36.282105][   T11] ------------[ cut here ]------------
| [ 36.282451][ T11] WARNING: CPU: 1 PID: 11 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) 
| [   36.282789][   T11] Modules linked in: netdevsim
| [   36.283322][   T11] Tainted: [W]=WARN
[   36.283453][   T11] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   36.283662][   T11] Workqueue: netns cleanup_net
[ 36.283855][ T11] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 36.284068][ T11] Code: 00 e8 a3 4a fe ff 48 8b 5c 24 58 e9 87 fb ff ff 49 8d bf 98 0c 00 00 be ff ff ff ff e8 d8 33 78 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:	a3 4a fe ff 48 8b 5c 	movabs %eax,0x58245c8b48fffe4a
   9:	24 58 
   b:	e9 87 fb ff ff       	jmp    0xfffffffffffffb97
  10:	49 8d bf 98 0c 00 00 	lea    0xc98(%r15),%rdi
  17:	be ff ff ff ff       	mov    $0xffffffff,%esi
  1c:	e8 d8 33 78 00       	call   0x7833f9
  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
[   36.284655][   T11] RSP: 0018:ffffc900000b7620 EFLAGS: 00010246
[   36.284870][   T11] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   36.285118][   T11] RDX: 0000000000000000 RSI: ffff88800d7eac98 RDI: ffff888001a82e10
[   36.285454][   T11] RBP: ffffffff88f23440 R08: 0000000000000000 R09: fffffbfff0dbd83c
[   36.285704][   T11] R10: ffffffff86dec1e7 R11: ffff888001a82300 R12: 0000000000000000
[   36.285953][   T11] R13: ffff88800d7ea128 R14: ffff88800d7ea008 R15: ffff88800d7ea000
[   36.286242][   T11] FS:  0000000000000000(0000) GS:ffff888036080000(0000) knlGS:0000000000000000
[   36.286527][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   36.286735][   T11] CR2: 00007fc3073732f0 CR3: 00000000059fa003 CR4: 0000000000772ef0
[   36.287071][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   36.287332][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   36.287580][   T11] PKRU: 55555554
[   36.287706][   T11] Call Trace:
[   36.287835][   T11]  <TASK>
[ 36.287924][ T11] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 36.288096][ T11] ? __warn (kernel/panic.c:748) 
[ 36.288238][ T11] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 36.288409][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 36.288587][ T11] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 36.288717][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 36.288885][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 36.289068][ T11] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 36.289261][ T11] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 36.289488][ T11] ? _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) 
[ 36.289662][ T11] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 36.289835][ T11] register_netdevice (net/core/dev.c:11003) 
[ 36.290012][ T11] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 36.290201][ T11] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 36.290387][ T11] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 36.290608][ T11] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 36.290836][ T11] ? nsim_dev_hwstats_init (./include/linux/workqueue.h:817 drivers/net/netdevsim/hwstats.c:442) netdevsim 
[ 36.291057][ T11] nsim_dev_reload_create (drivers/net/netdevsim/dev.c:1450 drivers/net/netdevsim/dev.c:1501) netdevsim 
[ 36.291298][ T11] ? __pfx_nsim_dev_reload_create (drivers/net/netdevsim/dev.c:1462) netdevsim 
[ 36.291520][ T11] ? devlink_params_driverinit_load_new (net/devlink/param.c:833 (discriminator 2)) 
[ 36.291748][ T11] devlink_reload (net/devlink/dev.c:474) 
[ 36.291924][ T11] ? __pfx_devlink_reload (net/devlink/dev.c:446) 
[ 36.292097][ T11] ? devlinks_xa_find_get (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/devlink/core.c:343) 
[ 36.292287][ T11] devlink_pernet_pre_exit (net/devlink/core.c:288 net/devlink/devl_internal.h:114 net/devlink/core.c:513) 
[ 36.292462][ T11] ? __pfx_devlink_pernet_pre_exit (net/devlink/core.c:496) 
[ 36.292686][ T11] cleanup_net (net/core/net_namespace.c:162 net/core/net_namespace.c:632) 
[ 36.292855][ T11] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 36.293025][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:594) 
[ 36.293204][ T11] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 21)) 
[ 36.293378][ T11] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 36.293544][ T11] ? process_one_work (kernel/workqueue.c:3214) 
[ 36.293723][ T11] process_one_work (kernel/workqueue.c:3238) 
[ 36.293902][ T11] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 36.294071][ T11] ? __pfx_process_one_work (kernel/workqueue.c:3140) 
[ 36.294259][ T11] ? assign_work (kernel/workqueue.c:1200) 
[ 36.294433][ T11] worker_thread (kernel/workqueue.c:3313 kernel/workqueue.c:3400) 
[ 36.294614][ T11] ? __pfx_worker_thread (kernel/workqueue.c:3346) 
[ 36.294784][ T11] kthread (kernel/kthread.c:464) 
[ 36.294915][ T11] ? __pfx_kthread (kernel/kthread.c:413) 
[ 36.295089][ T11] ? __pfx_kthread (kernel/kthread.c:413) 
[ 36.295267][ T11] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 36.295438][ T11] ? __pfx_kthread (kernel/kthread.c:413) 


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