======================================
| 0
| xx__-> [   11.525697][  T228] ------------[ cut here ]------------
| [ 11.526114][ T228] WARNING: CPU: 0 PID: 228 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) 
| [   11.526711][  T228] Modules linked in: netdevsim
[   11.527381][  T228] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 11.527693][ T228] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 11.528005][ T228] 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
[   11.528857][  T228] RSP: 0018:ffffc90000b07520 EFLAGS: 00010246
[   11.529168][  T228] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   11.529512][  T228] RDX: 0000000000000000 RSI: ffff888009642c98 RDI: ffff88800b5b50f8
[   11.529858][  T228] RBP: ffffffffb4b23440 R08: 0000000000000000 R09: fffffbfff653d83c
[   11.530223][  T228] R10: ffffffffb29ec1e7 R11: ffff88800b5b45c0 R12: 0000000000000000
[   11.530625][  T228] R13: ffff888009642128 R14: ffff888009642008 R15: ffff888009642000
[   11.530973][  T228] FS:  00007ff7b2919740(0000) GS:ffff888036000000(0000) knlGS:0000000000000000
[   11.531402][  T228] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   11.531714][  T228] CR2: 0000559564f04598 CR3: 00000000050c2005 CR4: 0000000000772ef0
[   11.532066][  T228] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   11.532438][  T228] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   11.532801][  T228] PKRU: 55555554
[   11.532983][  T228] Call Trace:
[   11.533175][  T228]  <TASK>
[ 11.533304][ T228] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 11.533560][ T228] ? __warn (kernel/panic.c:748) 
[ 11.533744][ T228] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 11.533981][ T228] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 11.534241][ T228] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 11.534424][ T228] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 11.534661][ T228] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 11.534916][ T228] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 11.535181][ T228] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 11.535485][ T228] ? _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) 
[ 11.535732][ T228] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 11.535994][ T228] register_netdevice (net/core/dev.c:11003) 
[ 11.536250][ T228] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 11.536500][ T228] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 11.536762][ T228] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 11.537075][ T228] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 11.537272][ T228] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 11.537580][ T228] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 11.537886][ T228] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[ 11.538212][ T228] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[ 11.538464][ T228] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[ 11.538765][ T228] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[ 11.539008][ T228] ? 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)) 
[ 11.539198][ T228] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[ 11.539443][ T228] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[ 11.539693][ T228] __driver_probe_device (drivers/base/dd.c:800) 
[ 11.539932][ T228] driver_probe_device (drivers/base/dd.c:830) 
[ 11.540172][ T228] __device_attach_driver (drivers/base/dd.c:959) 
[ 11.540410][ T228] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[ 11.540688][ T228] bus_for_each_drv (drivers/base/bus.c:462) 
[ 11.540926][ T228] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[ 11.541173][ T228] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 11.541421][ T228] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 11.541656][ T228] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 11.541896][ T228] __device_attach (drivers/base/dd.c:1030) 
[ 11.542131][ T228] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[ 11.542391][ T228] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 11.542632][ T228] ? 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) 
[ 11.542879][ T228] bus_probe_device (drivers/base/bus.c:537) 
[ 11.543138][ T228] device_add (drivers/base/core.c:3672) 
[ 11.543399][ T228] ? __pfx_device_add (drivers/base/core.c:3548) 
[ 11.543652][ T228] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[ 11.543903][ T228] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[ 11.544233][ T228] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[ 11.544548][ T228] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 11.544788][ T228] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[ 11.545052][ T228] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 11.545304][ T228] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 11.545564][ T228] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[ 11.545754][ T228] ? __pfx_vfs_write (fs/read_write.c:660) 
[ 11.546023][ T228] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 11.546269][ T228] ? 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) 
[ 11.546642][ T228] ? __pfx___up_read (kernel/locking/rwsem.c:1337) 
[ 11.547053][ T228] ksys_write (fs/read_write.c:731) 
[ 11.547370][ T228] ? __pfx_ksys_write (fs/read_write.c:721) 
[ 11.547754][ T228] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[ 11.548063][ T228] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 11.548316][ T228] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   11.548621][  T228] RIP: 0033:0x7ff7b2a5ab77
[ 11.548869][ T228] 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
[   11.549728][  T228] RSP: 002b:00007ffdb2535608 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   11.550121][  T228] RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 00007ff7b2a5ab77
[   11.550489][  T228] RDX: 0000000000000007 RSI: 0000559564f03590 RDI: 0000000000000001
[   11.550848][  T228] RBP: 0000559564f03590 R08: 0000000000000003 R09: 0000000000000077
[   11.551205][  T228] R10: 0000000000000063 R11: 0000000000000246 R12: 0000000000000007
[   11.551564][  T228] R13: 00007ff7b2b16760 R14: 0000000000000007 R15: 00007ff7b2b119c0
| [   11.848534][  T248] ------------[ cut here ]------------
| [ 11.848867][ T248] WARNING: CPU: 0 PID: 248 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) 
| [   11.849429][  T248] Modules linked in: netdevsim
| [   11.850079][  T248] Tainted: [W]=WARN
[   11.850275][  T248] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 11.850534][ T248] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 11.850805][ T248] 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
[   11.851539][  T248] RSP: 0000:ffffc900004d71e8 EFLAGS: 00010246
[   11.851804][  T248] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   11.852117][  T248] RDX: 0000000000000000 RSI: ffff8880050dac98 RDI: ffff88800a24d080
[   11.852445][  T248] RBP: ffff888002888040 R08: 0000000000000000 R09: fffffbfff653d83c
[   11.852760][  T248] R10: ffffffffb29ec1e7 R11: ffff88800a24c5c0 R12: 0000000000000000
[   11.853078][  T248] R13: ffff8880050da128 R14: ffff8880050da008 R15: ffff8880050da000
[   11.853429][  T248] FS:  00007f78e953a800(0000) GS:ffff888036000000(0000) knlGS:0000000000000000
[   11.853790][  T248] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   11.854051][  T248] CR2: 00007fc3eaacc000 CR3: 00000000090fc002 CR4: 0000000000772ef0
[   11.854377][  T248] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   11.854699][  T248] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   11.855014][  T248] PKRU: 55555554
[   11.855188][  T248] Call Trace:
[   11.855349][  T248]  <TASK>
[ 11.855460][ T248] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 11.855671][ T248] ? __warn (kernel/panic.c:748) 
[ 11.855837][ T248] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 11.856069][ T248] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 11.856302][ T248] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 11.856465][ T248] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 11.856678][ T248] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 11.856904][ T248] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 11.857119][ T248] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10566) 
[ 11.857343][ T248] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 11.857611][ T248] ? _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) 
[ 11.857831][ T248] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 11.858046][ T248] register_netdevice (net/core/dev.c:11003) 
[ 11.858275][ T248] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 11.858503][ T248] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 11.858738][ T248] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 11.859013][ T248] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 11.859314][ T248] ? nsim_dev_hwstats_init (./include/linux/workqueue.h:817 drivers/net/netdevsim/hwstats.c:442) netdevsim 
[ 11.859586][ T248] nsim_dev_reload_create (drivers/net/netdevsim/dev.c:1450 drivers/net/netdevsim/dev.c:1501) netdevsim 
[ 11.859859][ T248] ? __pfx_nsim_dev_reload_create (drivers/net/netdevsim/dev.c:1462) netdevsim 
[ 11.860126][ T248] ? devlink_params_driverinit_load_new (net/devlink/param.c:833 (discriminator 2)) 
[ 11.860411][ T248] devlink_reload (net/devlink/dev.c:474) 
[ 11.860636][ T248] ? __pfx_devlink_reload (net/devlink/dev.c:446) 
[ 11.860851][ T248] ? trace_cap_capable (./include/trace/events/capability.h:26 (discriminator 21)) 
[ 11.861069][ T248] ? cap_capable (security/commoncap.c:131) 
[ 11.861294][ T248] ? fdget (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1146 fs/file.c:1160) 
[ 11.861459][ T248] devlink_nl_reload_doit (net/devlink/dev.c:584) 
[ 11.861674][ T248] ? __pfx_devlink_nl_reload_doit (net/devlink/dev.c:520) 
[ 11.861933][ T248] ? __nla_parse (lib/nlattr.c:732) 
[ 11.862175][ T248] genl_family_rcv_msg_doit (net/netlink/genetlink.c:1115) 
[ 11.862398][ T248] ? __pfx_genl_family_rcv_msg_doit (net/netlink/genetlink.c:1088) 
[ 11.862682][ T248] ? cap_capable (security/commoncap.c:131) 
[ 11.862889][ T248] ? validate_chain (kernel/locking/lockdep.c:3799 kernel/locking/lockdep.c:3819 kernel/locking/lockdep.c:3874) 
[ 11.863111][ T248] genl_family_rcv_msg (net/netlink/genetlink.c:1195) 
[ 11.863342][ T248] ? __pfx_genl_family_rcv_msg (net/netlink/genetlink.c:1160) 
[ 11.863555][ T248] ? __pfx_devlink_nl_pre_doit_dev_lock (net/devlink/netlink.c:257) 
[ 11.863822][ T248] ? __pfx_devlink_nl_reload_doit (net/devlink/dev.c:520) 
[ 11.864083][ T248] ? __pfx_devlink_nl_post_doit_dev_lock (net/devlink/netlink.c:288) 
[ 11.864370][ T248] genl_rcv_msg (net/netlink/genetlink.c:65 net/netlink/genetlink.c:1211) 
[ 11.864587][ T248] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[ 11.864796][ T248] ? __pfx_genl_rcv_msg (net/netlink/genetlink.c:1201) 
[ 11.865010][ T248] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[ 11.865252][ T248] ? genl_rcv (net/netlink/genetlink.c:1219) 
[ 11.865421][ T248] ? __pfx_down_read (kernel/locking/rwsem.c:1522) 
[ 11.865639][ T248] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) 
[ 11.865863][ T248] genl_rcv (net/netlink/genetlink.c:1220) 
[ 11.866034][ T248] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[ 11.866262][ T248] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[ 11.866471][ T248] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 11.866680][ T248] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[ 11.866888][ T248] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[ 11.867096][ T248] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 11.867321][ T248] ? __might_fault (mm/memory.c:6851 mm/memory.c:6844) 
[ 11.867535][ T248] __sys_sendto (net/socket.c:709 net/socket.c:724 net/socket.c:2178) 
[ 11.867746][ T248] ? __pfx___sys_sendto (net/socket.c:2145) 
[ 11.867947][ T248] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 11.868152][ T248] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 21)) 
[ 11.868382][ T248] ? rseq_update_cpu_node_id (kernel/rseq.c:188 (discriminator 10)) 
[ 11.868598][ T248] ? __rseq_handle_notify_resume (kernel/rseq.c:420) 
[ 11.868850][ T248] ? rseq_update_cpu_node_id (kernel/rseq.c:188 (discriminator 10)) 
[ 11.869056][ T248] ? __pfx___rseq_handle_notify_resume (kernel/rseq.c:403) 
[ 11.869325][ T248] ? __pfx___x64_sys_openat (fs/open.c:1454) 
[ 11.869538][ T248] __x64_sys_sendto (net/socket.c:2181) 
[ 11.869740][ T248] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 11.869997][ T248] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 11.870215][ T248] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   11.870467][  T248] RIP: 0033:0x7f78e9746a4a
[ 11.870676][ T248] 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
[   11.871391][  T248] RSP: 002b:00007ffdd5047ea8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[   11.871708][  T248] RAX: ffffffffffffffda RBX: 000000003d1cbb00 RCX: 00007f78e9746a4a
[   11.872011][  T248] RDX: 0000000000000040 RSI: 000000003d1cbb00 RDI: 0000000000000005
[   11.872323][  T248] RBP: 000000003d1cb910 R08: 00007f78e98ea200 R09: 000000000000000c
[   11.872638][  T248] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000040f200
[   11.872944][  T248] R13: 000000003d1cb910 R14: 0000000000000000 R15: 0000000000000001
| [   81.002736][   T67] ------------[ cut here ]------------
| [ 81.003037][ T67] WARNING: CPU: 0 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) 
| [   81.003446][   T67] Modules linked in: netdevsim
| [   81.004022][   T67] Tainted: [W]=WARN
[   81.004182][   T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   81.004419][   T67] Workqueue: netns cleanup_net
[ 81.004640][ T67] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 81.004871][ 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
[   81.005541][   T67] RSP: 0018:ffffc90000487620 EFLAGS: 00010246
[   81.005781][   T67] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   81.006048][   T67] RDX: 0000000000000000 RSI: ffff8880058cac98 RDI: ffff888007b28b50
[   81.006327][   T67] RBP: ffffffffb4b23440 R08: 0000000000000000 R09: fffffbfff653d83c
[   81.006594][   T67] R10: ffffffffb29ec1e7 R11: ffff888007b28040 R12: 0000000000000000
[   81.006879][   T67] R13: ffff8880058ca128 R14: ffff8880058ca008 R15: ffff8880058ca000
[   81.007149][   T67] FS:  0000000000000000(0000) GS:ffff888036000000(0000) knlGS:0000000000000000
[   81.007473][   T67] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   81.007799][   T67] CR2: 00007f918f8f5000 CR3: 0000000012128005 CR4: 0000000000772ef0
[   81.008094][   T67] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   81.008384][   T67] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   81.008652][   T67] PKRU: 55555554
[   81.008795][   T67] Call Trace:
[   81.008935][   T67]  <TASK>
[ 81.009034][ T67] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 81.009230][ T67] ? __warn (kernel/panic.c:748) 
[ 81.009374][ T67] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 81.009563][ T67] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 81.009758][ T67] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 81.009897][ T67] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 81.010082][ T67] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 81.010300][ T67] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 81.010492][ T67] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 81.010730][ 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) 
[ 81.010918][ T67] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 81.011116][ T67] register_netdevice (net/core/dev.c:11003) 
[ 81.011323][ T67] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 81.011525][ T67] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 81.011742][ T67] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 81.011990][ T67] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 81.012261][ T67] ? nsim_dev_hwstats_init (./include/linux/workqueue.h:817 drivers/net/netdevsim/hwstats.c:442) netdevsim 
[ 81.012519][ T67] nsim_dev_reload_create (drivers/net/netdevsim/dev.c:1450 drivers/net/netdevsim/dev.c:1501) netdevsim 
[ 81.012786][ T67] ? __pfx_nsim_dev_reload_create (drivers/net/netdevsim/dev.c:1462) netdevsim 
[ 81.013028][ T67] ? devlink_params_driverinit_load_new (net/devlink/param.c:833 (discriminator 2)) 
[ 81.013302][ T67] devlink_reload (net/devlink/dev.c:474) 
[ 81.013508][ T67] ? __pfx_devlink_reload (net/devlink/dev.c:446) 
[ 81.013718][ T67] ? devlinks_xa_find_get (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/devlink/core.c:343) 
[ 81.013924][ T67] devlink_pernet_pre_exit (net/devlink/core.c:288 net/devlink/devl_internal.h:114 net/devlink/core.c:513) 
[ 81.014124][ T67] ? __pfx_devlink_pernet_pre_exit (net/devlink/core.c:496) 
[ 81.014397][ T67] cleanup_net (net/core/net_namespace.c:162 net/core/net_namespace.c:632) 
[ 81.014597][ T67] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 81.014801][ T67] ? __pfx_cleanup_net (net/core/net_namespace.c:594) 
[ 81.015029][ T67] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 21)) 
[ 81.015360][ T67] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 81.015683][ T67] ? process_one_work (kernel/workqueue.c:3214) 
[ 81.015999][ T67] process_one_work (kernel/workqueue.c:3238) 
[ 81.016284][ T67] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 81.016485][ T67] ? __pfx_process_one_work (kernel/workqueue.c:3140) 
[ 81.016698][ T67] ? assign_work (kernel/workqueue.c:1200) 
[ 81.016899][ T67] worker_thread (kernel/workqueue.c:3313 kernel/workqueue.c:3400) 
[ 81.017093][ T67] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 81.017343][ T67] ? __pfx_worker_thread (kernel/workqueue.c:3346) 
[ 81.017531][ T67] kthread (kernel/kthread.c:464) 
[ 81.017682][ T67] ? __pfx_kthread (kernel/kthread.c:413) 
[ 81.017873][ T67] ? __pfx_kthread (kernel/kthread.c:413) 
[ 81.018076][ T67] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 81.018275][ 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