======================================
| 0
| xx__-> [   10.961097][  T227] ------------[ cut here ]------------
| [ 10.961515][ T227] WARNING: CPU: 0 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) 
| [   10.962059][  T227] Modules linked in: netdevsim
[   10.962703][  T227] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 10.963043][ T227] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.963334][ 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
[   10.964400][  T227] RSP: 0018:ffffc90000b67520 EFLAGS: 00010246
[   10.964837][  T227] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   10.965356][  T227] RDX: 0000000000000000 RSI: ffff8880114dac98 RDI: ffff8880093bd0f8
[   10.965863][  T227] RBP: ffffffffb4f23440 R08: 0000000000000000 R09: fffffbfff65bd83c
[   10.966370][  T227] R10: ffffffffb2dec1e7 R11: ffff8880093bc5c0 R12: 0000000000000000
[   10.966701][  T227] R13: ffff8880114da128 R14: ffff8880114da008 R15: ffff8880114da000
[   10.967027][  T227] FS:  00007fc47ae3b740(0000) GS:ffff888036000000(0000) knlGS:0000000000000000
[   10.967479][  T227] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   10.967800][  T227] CR2: 000055765e1f4598 CR3: 00000000103dc002 CR4: 0000000000772ef0
[   10.968170][  T227] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   10.968540][  T227] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   10.968912][  T227] PKRU: 55555554
[   10.969074][  T227] Call Trace:
[   10.969303][  T227]  <TASK>
[ 10.969424][ T227] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.969685][ T227] ? __warn (kernel/panic.c:748) 
[ 10.969909][ T227] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.970198][ T227] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 10.970504][ T227] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 10.970769][ T227] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 10.971136][ T227] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 10.971552][ T227] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 10.971932][ T227] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 10.972394][ 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) 
[ 10.972763][ T227] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 10.973124][ T227] register_netdevice (net/core/dev.c:11003) 
[ 10.973509][ T227] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 10.973814][ T227] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 10.974038][ T227] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 10.974315][ T227] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 10.974475][ T227] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 10.974826][ T227] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 10.975143][ T227] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[ 10.975432][ T227] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[ 10.975665][ T227] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[ 10.975931][ T227] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[ 10.976142][ 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)) 
[ 10.976310][ T227] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[ 10.976528][ T227] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[ 10.976745][ T227] __driver_probe_device (drivers/base/dd.c:800) 
[ 10.976956][ T227] driver_probe_device (drivers/base/dd.c:830) 
[ 10.977180][ T227] __device_attach_driver (drivers/base/dd.c:959) 
[ 10.977394][ T227] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[ 10.977659][ T227] bus_for_each_drv (drivers/base/bus.c:462) 
[ 10.977870][ T227] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[ 10.978074][ T227] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 10.978294][ T227] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 10.978501][ T227] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 10.978719][ T227] __device_attach (drivers/base/dd.c:1030) 
[ 10.978924][ T227] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[ 10.979129][ T227] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 10.979345][ 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) 
[ 10.979561][ T227] bus_probe_device (drivers/base/bus.c:537) 
[ 10.979772][ T227] device_add (drivers/base/core.c:3672) 
[ 10.979983][ T227] ? __pfx_device_add (drivers/base/core.c:3548) 
[ 10.980202][ T227] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[ 10.980424][ T227] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[ 10.980691][ T227] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[ 10.980959][ T227] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 10.981186][ T227] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[ 10.981401][ T227] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 10.981612][ T227] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 10.981824][ T227] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[ 10.981993][ T227] ? __pfx_vfs_write (fs/read_write.c:660) 
[ 10.982214][ T227] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 10.982418][ 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) 
[ 10.982635][ T227] ? __pfx___up_read (kernel/locking/rwsem.c:1337) 
[ 10.982853][ T227] ksys_write (fs/read_write.c:731) 
[ 10.983010][ T227] ? __pfx_ksys_write (fs/read_write.c:721) 
[ 10.983232][ T227] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[ 10.983451][ T227] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 10.983662][ T227] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   10.983917][  T227] RIP: 0033:0x7fc47af7cb77
[ 10.984132][ 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
[   10.984862][  T227] RSP: 002b:00007ffe5947a918 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   10.985186][  T227] RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 00007fc47af7cb77
[   10.985508][  T227] RDX: 0000000000000007 RSI: 000055765e1f3590 RDI: 0000000000000001
[   10.985815][  T227] RBP: 000055765e1f3590 R08: 0000000000000003 R09: 0000000000000077
[   10.986128][  T227] R10: 0000000000000063 R11: 0000000000000246 R12: 0000000000000007
[   10.986451][  T227] R13: 00007fc47b038760 R14: 0000000000000007 R15: 00007fc47b0339c0
| [   11.269455][  T246] ------------[ cut here ]------------
| [ 11.269794][ T246] WARNING: CPU: 2 PID: 246 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) 
| [   11.270207][  T246] Modules linked in: netdevsim
| [   11.270935][  T246] Tainted: [W]=WARN
[   11.271183][  T246] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 11.271443][ T246] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 11.271711][ T246] 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
[   11.272403][  T246] RSP: 0018:ffffc90000be71e8 EFLAGS: 00010246
[   11.272660][  T246] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   11.272957][  T246] RDX: 0000000000000000 RSI: ffff8880092b2c98 RDI: ffff88801060adc0
[   11.273264][  T246] RBP: ffff8880115f0040 R08: 0000000000000000 R09: fffffbfff65bd83c
[   11.273564][  T246] R10: ffffffffb2dec1e7 R11: ffff88801060a300 R12: 0000000000000000
[   11.273859][  T246] R13: ffff8880092b2128 R14: ffff8880092b2008 R15: ffff8880092b2000
[   11.274168][  T246] FS:  00007f79f0e54800(0000) GS:ffff888036100000(0000) knlGS:0000000000000000
[   11.274522][  T246] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   11.274814][  T246] CR2: 00007f79f0f93440 CR3: 0000000004c00003 CR4: 0000000000772ef0
[   11.275123][  T246] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   11.275440][  T246] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   11.275734][  T246] PKRU: 55555554
[   11.275891][  T246] Call Trace:
[   11.276050][  T246]  <TASK>
[ 11.276170][ T246] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 11.276379][ T246] ? __warn (kernel/panic.c:748) 
[ 11.276541][ T246] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 11.276754][ T246] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 11.276966][ T246] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 11.277124][ T246] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 11.277340][ T246] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 11.277560][ T246] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 11.277772][ T246] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10566) 
[ 11.277984][ T246] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 11.278261][ T246] ? _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) 
[ 11.278481][ T246] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 11.278732][ T246] register_netdevice (net/core/dev.c:11003) 
[ 11.278987][ T246] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 11.279220][ T246] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 11.279441][ T246] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 11.279703][ T246] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 11.279986][ T246] ? nsim_dev_hwstats_init (./include/linux/workqueue.h:817 drivers/net/netdevsim/hwstats.c:442) netdevsim 
[ 11.280263][ T246] nsim_dev_reload_create (drivers/net/netdevsim/dev.c:1450 drivers/net/netdevsim/dev.c:1501) netdevsim 
[ 11.280531][ T246] ? __pfx_nsim_dev_reload_create (drivers/net/netdevsim/dev.c:1462) netdevsim 
[ 11.280788][ T246] ? devlink_params_driverinit_load_new (net/devlink/param.c:833 (discriminator 2)) 
[ 11.281065][ T246] devlink_reload (net/devlink/dev.c:474) 
[ 11.281291][ T246] ? __pfx_devlink_reload (net/devlink/dev.c:446) 
[ 11.281491][ T246] ? trace_cap_capable (./include/trace/events/capability.h:26 (discriminator 21)) 
[ 11.281703][ T246] ? cap_capable (security/commoncap.c:131) 
[ 11.281905][ T246] ? fdget (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1146 fs/file.c:1160) 
[ 11.282075][ T246] devlink_nl_reload_doit (net/devlink/dev.c:584) 
[ 11.282293][ T246] ? __pfx_devlink_nl_reload_doit (net/devlink/dev.c:520) 
[ 11.282554][ T246] ? __nla_parse (lib/nlattr.c:732) 
[ 11.282804][ T246] genl_family_rcv_msg_doit (net/netlink/genetlink.c:1115) 
[ 11.283018][ T246] ? __pfx_genl_family_rcv_msg_doit (net/netlink/genetlink.c:1088) 
[ 11.283301][ T246] ? cap_capable (security/commoncap.c:131) 
[ 11.283508][ T246] ? validate_chain (kernel/locking/lockdep.c:3799 kernel/locking/lockdep.c:3819 kernel/locking/lockdep.c:3874) 
[ 11.283722][ T246] genl_family_rcv_msg (net/netlink/genetlink.c:1195) 
[ 11.283931][ T246] ? __pfx_genl_family_rcv_msg (net/netlink/genetlink.c:1160) 
[ 11.284141][ T246] ? __pfx_devlink_nl_pre_doit_dev_lock (net/devlink/netlink.c:257) 
[ 11.284454][ T246] ? __pfx_devlink_nl_reload_doit (net/devlink/dev.c:520) 
[ 11.284850][ T246] ? __pfx_devlink_nl_post_doit_dev_lock (net/devlink/netlink.c:288) 
[ 11.285255][ T246] genl_rcv_msg (net/netlink/genetlink.c:65 net/netlink/genetlink.c:1211) 
[ 11.285597][ T246] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[ 11.285928][ T246] ? __pfx_genl_rcv_msg (net/netlink/genetlink.c:1201) 
[ 11.286314][ T246] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[ 11.286689][ T246] ? genl_rcv (net/netlink/genetlink.c:1219) 
[ 11.286961][ T246] ? __pfx_down_read (kernel/locking/rwsem.c:1522) 
[ 11.287331][ T246] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) 
[ 11.287680][ T246] genl_rcv (net/netlink/genetlink.c:1220) 
[ 11.287941][ T246] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[ 11.288291][ T246] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[ 11.288628][ T246] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 11.288996][ T246] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[ 11.289363][ T246] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[ 11.289701][ T246] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 11.290043][ T246] ? __might_fault (mm/memory.c:6851 mm/memory.c:6844) 
[ 11.290414][ T246] __sys_sendto (net/socket.c:709 net/socket.c:724 net/socket.c:2178) 
[ 11.290759][ T246] ? __pfx___sys_sendto (net/socket.c:2145) 
[ 11.291106][ T246] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 11.291464][ T246] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 21)) 
[ 11.291821][ T246] ? rseq_update_cpu_node_id (kernel/rseq.c:188 (discriminator 10)) 
[ 11.292146][ T246] ? __rseq_handle_notify_resume (kernel/rseq.c:420) 
[ 11.292491][ T246] ? rseq_update_cpu_node_id (kernel/rseq.c:188 (discriminator 10)) 
[ 11.292715][ T246] ? __pfx___rseq_handle_notify_resume (kernel/rseq.c:403) 
[ 11.292979][ T246] ? __pfx___x64_sys_openat (fs/open.c:1454) 
[ 11.293202][ T246] __x64_sys_sendto (net/socket.c:2181) 
[ 11.293419][ T246] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 11.293683][ T246] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 11.293891][ T246] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   11.294144][  T246] RIP: 0033:0x7f79f1060a4a
[ 11.294366][ T246] 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
[   11.295058][  T246] RSP: 002b:00007ffd6846fae8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[   11.295368][  T246] RAX: ffffffffffffffda RBX: 0000000034a40b00 RCX: 00007f79f1060a4a
[   11.295687][  T246] RDX: 0000000000000040 RSI: 0000000034a40b00 RDI: 0000000000000005
[   11.295991][  T246] RBP: 0000000034a40910 R08: 00007f79f1204200 R09: 000000000000000c
[   11.296294][  T246] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000040f200
[   11.296614][  T246] R13: 0000000034a40910 R14: 0000000000000000 R15: 0000000000000001
| [   82.194784][   T67] ------------[ cut here ]------------
| [ 82.195060][ T67] WARNING: CPU: 3 PID: 67 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) 
| [   82.195446][   T67] Modules linked in: netdevsim
| [   82.195981][   T67] Tainted: [W]=WARN
[   82.196118][   T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   82.196359][   T67] Workqueue: netns cleanup_net
[ 82.196566][ T67] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 82.196786][ T67] 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
[   82.197406][   T67] RSP: 0018:ffffc90000487620 EFLAGS: 00010246
[   82.197629][   T67] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   82.197886][   T67] RDX: 0000000000000000 RSI: ffff888012852c98 RDI: ffff8880061f0b50
[   82.198187][   T67] RBP: ffffffffb4f23440 R08: 0000000000000000 R09: fffffbfff65bd83c
[   82.198443][   T67] R10: ffffffffb2dec1e7 R11: ffff8880061f0040 R12: 0000000000000000
[   82.198695][   T67] R13: ffff888012852128 R14: ffff888012852008 R15: ffff888012852000
[   82.198957][   T67] FS:  0000000000000000(0000) GS:ffff888036180000(0000) knlGS:0000000000000000
[   82.199259][   T67] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   82.199489][   T67] CR2: 00007fc47ae3a258 CR3: 000000000d128004 CR4: 0000000000772ef0
[   82.199745][   T67] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   82.200138][   T67] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   82.200400][   T67] PKRU: 55555554
[   82.200531][   T67] Call Trace:
[   82.200675][   T67]  <TASK>
[ 82.200765][ T67] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 82.200942][ T67] ? __warn (kernel/panic.c:748) 
[ 82.201073][ T67] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 82.201260][ T67] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 82.201448][ T67] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 82.201580][ T67] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 82.201752][ T67] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 82.201938][ T67] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 82.202149][ T67] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 82.202381][ T67] ? _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) 
[ 82.202560][ T67] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 82.202734][ T67] register_netdevice (net/core/dev.c:11003) 
[ 82.202908][ T67] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 82.203089][ T67] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 82.203283][ T67] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 82.203518][ T67] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 82.203751][ T67] ? nsim_dev_hwstats_init (./include/linux/workqueue.h:817 drivers/net/netdevsim/hwstats.c:442) netdevsim 
[ 82.203977][ T67] nsim_dev_reload_create (drivers/net/netdevsim/dev.c:1450 drivers/net/netdevsim/dev.c:1501) netdevsim 
[ 82.204207][ T67] ? __pfx_nsim_dev_reload_create (drivers/net/netdevsim/dev.c:1462) netdevsim 
[ 82.204428][ T67] ? devlink_params_driverinit_load_new (net/devlink/param.c:833 (discriminator 2)) 
[ 82.204655][ T67] devlink_reload (net/devlink/dev.c:474) 
[ 82.204830][ T67] ? __pfx_devlink_reload (net/devlink/dev.c:446) 
[ 82.205006][ T67] ? devlinks_xa_find_get (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/devlink/core.c:343) 
[ 82.205199][ T67] devlink_pernet_pre_exit (net/devlink/core.c:288 net/devlink/devl_internal.h:114 net/devlink/core.c:513) 
[ 82.205402][ T67] ? __pfx_devlink_pernet_pre_exit (net/devlink/core.c:496) 
[ 82.205625][ T67] cleanup_net (net/core/net_namespace.c:162 net/core/net_namespace.c:632) 
[ 82.205798][ T67] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 82.206006][ T67] ? __pfx_cleanup_net (net/core/net_namespace.c:594) 
[ 82.206188][ T67] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 21)) 
[ 82.206368][ T67] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 82.206536][ T67] ? process_one_work (kernel/workqueue.c:3214) 
[ 82.206722][ T67] process_one_work (kernel/workqueue.c:3238) 
[ 82.206900][ T67] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 82.207072][ T67] ? __pfx_process_one_work (kernel/workqueue.c:3140) 
[ 82.207267][ T67] ? assign_work (kernel/workqueue.c:1200) 
[ 82.207469][ T67] worker_thread (kernel/workqueue.c:3313 kernel/workqueue.c:3400) 
[ 82.207637][ T67] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 82.207858][ T67] ? __pfx_worker_thread (kernel/workqueue.c:3346) 
[ 82.208031][ T67] kthread (kernel/kthread.c:464) 
[ 82.208176][ T67] ? __pfx_kthread (kernel/kthread.c:413) 
[ 82.208382][ T67] ? __pfx_kthread (kernel/kthread.c:413) 
[ 82.208555][ T67] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 82.208740][ T67] ? __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