======================================
| 0
| xx__-> [   11.258323][  T227] ------------[ cut here ]------------
| [ 11.258877][ 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) 
| [   11.259448][  T227] Modules linked in: netdevsim
[   11.260198][  T227] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 11.260640][ T227] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 11.260976][ 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
[   11.261793][  T227] RSP: 0018:ffffc90000ae7520 EFLAGS: 00010246
[   11.262137][  T227] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   11.262548][  T227] RDX: 0000000000000000 RSI: ffff8880091a2c98 RDI: ffff88800b4750f8
[   11.262937][  T227] RBP: ffffffffa4923440 R08: 0000000000000000 R09: fffffbfff44fd83c
[   11.263383][  T227] R10: ffffffffa27ec1e7 R11: ffff88800b4745c0 R12: 0000000000000000
[   11.263791][  T227] R13: ffff8880091a2128 R14: ffff8880091a2008 R15: ffff8880091a2000
[   11.264178][  T227] FS:  00007f7cb5772740(0000) GS:ffff888036100000(0000) knlGS:0000000000000000
[   11.264613][  T227] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   11.264942][  T227] CR2: 00005556c20084c8 CR3: 00000000026b4004 CR4: 0000000000772ef0
[   11.265353][  T227] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   11.265743][  T227] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   11.266139][  T227] PKRU: 55555554
[   11.266345][  T227] Call Trace:
[   11.266550][  T227]  <TASK>
[ 11.266693][ T227] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 11.266990][ T227] ? __warn (kernel/panic.c:748) 
[ 11.267203][ T227] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 11.267460][ T227] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 11.267722][ T227] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 11.267924][ T227] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 11.268209][ T227] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 11.268488][ T227] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 11.268750][ T227] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 11.269082][ 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) 
[ 11.269350][ T227] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 11.269609][ T227] register_netdevice (net/core/dev.c:11003) 
[ 11.269891][ T227] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 11.270183][ T227] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 11.270489][ T227] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 11.270830][ T227] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 11.271072][ T227] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 11.271411][ T227] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 11.271752][ T227] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim 
[ 11.272108][ T227] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim 
[ 11.272384][ T227] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim 
[ 11.272714][ T227] ? kernfs_create_link (fs/kernfs/symlink.c:48) 
[ 11.272996][ 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)) 
[ 11.273196][ T227] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) 
[ 11.273486][ T227] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) 
[ 11.273763][ T227] __driver_probe_device (drivers/base/dd.c:800) 
[ 11.274038][ T227] driver_probe_device (drivers/base/dd.c:830) 
[ 11.274292][ T227] __device_attach_driver (drivers/base/dd.c:959) 
[ 11.274539][ T227] ? __pfx___device_attach_driver (drivers/base/dd.c:922) 
[ 11.274855][ T227] bus_for_each_drv (drivers/base/bus.c:462) 
[ 11.275112][ T227] ? __pfx_bus_for_each_drv (drivers/base/bus.c:450) 
[ 11.275362][ T227] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 11.275638][ T227] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 11.275892][ T227] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 11.276160][ T227] __device_attach (drivers/base/dd.c:1030) 
[ 11.276427][ T227] ? __pfx___device_attach (drivers/base/dd.c:1001) 
[ 11.276670][ T227] ? bus_to_subsys (drivers/base/bus.c:85) 
[ 11.276918][ 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) 
[ 11.277178][ T227] bus_probe_device (drivers/base/bus.c:537) 
[ 11.277431][ T227] device_add (drivers/base/core.c:3672) 
[ 11.277681][ T227] ? __pfx_device_add (drivers/base/core.c:3548) 
[ 11.277929][ T227] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) 
[ 11.278202][ T227] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim 
[ 11.278521][ T227] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim 
[ 11.278835][ T227] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 11.279113][ T227] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[ 11.279399][ T227] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) 
[ 11.279649][ T227] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 11.279901][ T227] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[ 11.280150][ T227] ? __pfx_vfs_write (fs/read_write.c:660) 
[ 11.280426][ T227] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 11.280680][ 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) 
[ 11.280966][ T227] ? __pfx___up_read (kernel/locking/rwsem.c:1337) 
[ 11.281223][ T227] ksys_write (fs/read_write.c:731) 
[ 11.281420][ T227] ? __pfx_ksys_write (fs/read_write.c:721) 
[ 11.281679][ T227] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[ 11.281938][ T227] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 11.282208][ T227] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   11.282523][  T227] RIP: 0033:0x7f7cb58b3b77
[ 11.282778][ 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
[   11.283645][  T227] RSP: 002b:00007ffd236e66b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   11.284070][  T227] RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 00007f7cb58b3b77
[   11.284432][  T227] RDX: 0000000000000007 RSI: 00005556c20074c0 RDI: 0000000000000001
[   11.284827][  T227] RBP: 00005556c20074c0 R08: 0000000000000003 R09: 0000000000000077
[   11.285208][  T227] R10: 0000000000000063 R11: 0000000000000246 R12: 0000000000000007
[   11.285623][  T227] R13: 00007f7cb596f760 R14: 0000000000000007 R15: 00007f7cb596a9c0
| [   11.542006][  T255] ------------[ cut here ]------------
| [ 11.542347][ T255] WARNING: CPU: 3 PID: 255 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) 
| [   11.542916][  T255] Modules linked in: netdevsim
| [   11.543563][  T255] Tainted: [W]=WARN
[   11.543749][  T255] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 11.544019][ T255] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 11.544278][ T255] 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
[   11.545026][  T255] RSP: 0018:ffffc900004b71e8 EFLAGS: 00010246
[   11.545286][  T255] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   11.545581][  T255] RDX: 0000000000000000 RSI: ffff8880026f2c98 RDI: ffff88800b708b00
[   11.545885][  T255] RBP: ffff888009228040 R08: 0000000000000000 R09: fffffbfff44fd83c
[   11.546195][  T255] R10: ffffffffa27ec1e7 R11: ffff88800b708040 R12: 0000000000000000
[   11.546503][  T255] R13: ffff8880026f2128 R14: ffff8880026f2008 R15: ffff8880026f2000
[   11.546800][  T255] FS:  00007fce04383800(0000) GS:ffff888036180000(0000) knlGS:0000000000000000
[   11.547154][  T255] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   11.547416][  T255] CR2: 00007fce044c2440 CR3: 00000000050c0003 CR4: 0000000000772ef0
[   11.547719][  T255] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   11.548031][  T255] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   11.548373][  T255] PKRU: 55555554
[   11.548533][  T255] Call Trace:
[   11.548690][  T255]  <TASK>
[ 11.548821][ T255] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 11.549048][ T255] ? __warn (kernel/panic.c:748) 
[ 11.549210][ T255] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 11.549420][ T255] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 11.549636][ T255] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 11.549795][ T255] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 11.550013][ T255] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 11.550242][ T255] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 11.550475][ T255] ? __netdev_update_features (./include/net/netdev_lock.h:52 net/core/dev.c:10566) 
[ 11.550702][ T255] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 11.550971][ T255] ? _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) 
[ 11.551187][ T255] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 11.551398][ T255] register_netdevice (net/core/dev.c:11003) 
[ 11.551617][ T255] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 11.551829][ T255] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 11.552071][ T255] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 11.552341][ T255] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 11.552609][ T255] ? nsim_dev_hwstats_init (./include/linux/workqueue.h:817 drivers/net/netdevsim/hwstats.c:442) netdevsim 
[ 11.552910][ T255] nsim_dev_reload_create (drivers/net/netdevsim/dev.c:1450 drivers/net/netdevsim/dev.c:1501) netdevsim 
[ 11.553192][ T255] ? __pfx_nsim_dev_reload_create (drivers/net/netdevsim/dev.c:1462) netdevsim 
[ 11.553501][ T255] ? devlink_params_driverinit_load_new (net/devlink/param.c:833 (discriminator 2)) 
[ 11.553786][ T255] devlink_reload (net/devlink/dev.c:474) 
[ 11.554026][ T255] ? __pfx_devlink_reload (net/devlink/dev.c:446) 
[ 11.554240][ T255] ? trace_cap_capable (./include/trace/events/capability.h:26 (discriminator 21)) 
[ 11.554459][ T255] ? cap_capable (security/commoncap.c:131) 
[ 11.554654][ T255] ? fdget (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1146 fs/file.c:1160) 
[ 11.554818][ T255] devlink_nl_reload_doit (net/devlink/dev.c:584) 
[ 11.555036][ T255] ? __pfx_devlink_nl_reload_doit (net/devlink/dev.c:520) 
[ 11.555301][ T255] ? __nla_parse (lib/nlattr.c:732) 
[ 11.555521][ T255] genl_family_rcv_msg_doit (net/netlink/genetlink.c:1115) 
[ 11.555738][ T255] ? __pfx_genl_family_rcv_msg_doit (net/netlink/genetlink.c:1088) 
[ 11.556014][ T255] ? cap_capable (security/commoncap.c:131) 
[ 11.556219][ T255] ? validate_chain (kernel/locking/lockdep.c:3799 kernel/locking/lockdep.c:3819 kernel/locking/lockdep.c:3874) 
[ 11.556451][ T255] genl_family_rcv_msg (net/netlink/genetlink.c:1195) 
[ 11.556659][ T255] ? __pfx_genl_family_rcv_msg (net/netlink/genetlink.c:1160) 
[ 11.556865][ T255] ? __pfx_devlink_nl_pre_doit_dev_lock (net/devlink/netlink.c:257) 
[ 11.557141][ T255] ? __pfx_devlink_nl_reload_doit (net/devlink/dev.c:520) 
[ 11.557390][ T255] ? __pfx_devlink_nl_post_doit_dev_lock (net/devlink/netlink.c:288) 
[ 11.557681][ T255] genl_rcv_msg (net/netlink/genetlink.c:65 net/netlink/genetlink.c:1211) 
[ 11.557887][ T255] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[ 11.558104][ T255] ? __pfx_genl_rcv_msg (net/netlink/genetlink.c:1201) 
[ 11.558315][ T255] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[ 11.558532][ T255] ? genl_rcv (net/netlink/genetlink.c:1219) 
[ 11.558683][ T255] ? __pfx_down_read (kernel/locking/rwsem.c:1522) 
[ 11.558886][ T255] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) 
[ 11.559102][ T255] genl_rcv (net/netlink/genetlink.c:1220) 
[ 11.559258][ T255] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[ 11.559470][ T255] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[ 11.559671][ T255] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 11.559879][ T255] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[ 11.560096][ T255] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[ 11.560312][ T255] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 11.560521][ T255] ? __might_fault (mm/memory.c:6851 mm/memory.c:6844) 
[ 11.560727][ T255] __sys_sendto (net/socket.c:709 net/socket.c:724 net/socket.c:2178) 
[ 11.560936][ T255] ? __pfx___sys_sendto (net/socket.c:2145) 
[ 11.561147][ T255] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 11.561349][ T255] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 21)) 
[ 11.561558][ T255] ? rseq_update_cpu_node_id (kernel/rseq.c:188 (discriminator 10)) 
[ 11.561769][ T255] ? __rseq_handle_notify_resume (kernel/rseq.c:420) 
[ 11.562030][ T255] ? rseq_update_cpu_node_id (kernel/rseq.c:188 (discriminator 10)) 
[ 11.562232][ T255] ? __pfx___rseq_handle_notify_resume (kernel/rseq.c:403) 
[ 11.562495][ T255] ? __pfx___x64_sys_openat (fs/open.c:1454) 
[ 11.562704][ T255] __x64_sys_sendto (net/socket.c:2181) 
[ 11.562899][ T255] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 11.563163][ T255] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 11.563371][ T255] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   11.563625][  T255] RIP: 0033:0x7fce0458fa4a
[ 11.563835][ T255] 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
[   11.564549][  T255] RSP: 002b:00007ffff20faec8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[   11.564849][  T255] RAX: ffffffffffffffda RBX: 0000000029602b00 RCX: 00007fce0458fa4a
[   11.565158][  T255] RDX: 0000000000000040 RSI: 0000000029602b00 RDI: 0000000000000005
[   11.565460][  T255] RBP: 0000000029602910 R08: 00007fce04733200 R09: 000000000000000c
[   11.565759][  T255] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000040f200
[   11.566060][  T255] R13: 0000000029602910 R14: 0000000000000000 R15: 0000000000000001
| [   38.248604][   T66] ------------[ cut here ]------------
| [ 38.248899][ T66] WARNING: CPU: 0 PID: 66 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) 
| [   38.249377][   T66] Modules linked in: netdevsim
| [   38.249914][   T66] Tainted: [W]=WARN
[   38.250141][   T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   38.250370][   T66] Workqueue: netns cleanup_net
[ 38.250577][ T66] RIP: 0010:__netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 38.250793][ T66] 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
[   38.251459][   T66] RSP: 0018:ffffc90000477620 EFLAGS: 00010246
[   38.251677][   T66] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   38.251933][   T66] RDX: 0000000000000000 RSI: ffff88800939ac98 RDI: ffff888008ce50d0
[   38.252395][   T66] RBP: ffffffffa4923440 R08: 0000000000000000 R09: fffffbfff44fd83c
[   38.252656][   T66] R10: ffffffffa27ec1e7 R11: ffff888008ce45c0 R12: 0000000000000000
[   38.252919][   T66] R13: ffff88800939a128 R14: ffff88800939a008 R15: ffff88800939a000
[   38.253184][   T66] FS:  0000000000000000(0000) GS:ffff888036000000(0000) knlGS:0000000000000000
[   38.253480][   T66] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   38.253693][   T66] CR2: 00007f7cb5771258 CR3: 0000000016f28003 CR4: 0000000000772ef0
[   38.253960][   T66] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   38.254211][   T66] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   38.254466][   T66] PKRU: 55555554
[   38.254596][   T66] Call Trace:
[   38.254725][   T66]  <TASK>
[ 38.254816][ T66] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 38.255000][ T66] ? __warn (kernel/panic.c:748) 
[ 38.255140][ T66] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 38.255318][ T66] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 38.255498][ T66] ? handle_bug (arch/x86/kernel/traps.c:285) 
[ 38.255635][ T66] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
[ 38.255804][ T66] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) 
[ 38.256002][ T66] ? __netdev_update_features (./include/net/netdev_lock.h:52 ./include/net/netdev_lock.h:49 net/core/dev.c:10566) 
[ 38.256195][ T66] ? __pfx___netdev_update_features (net/core/dev.c:10559) 
[ 38.256408][ T66] ? _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) 
[ 38.256584][ T66] ? netdev_register_kobject (net/core/net-sysfs.c:2344) 
[ 38.256761][ T66] register_netdevice (net/core/dev.c:11003) 
[ 38.256937][ T66] ? __pfx_register_netdevice (net/core/dev.c:10881) 
[ 38.257129][ T66] nsim_create (drivers/net/netdevsim/netdev.c:958 drivers/net/netdevsim/netdev.c:1018) netdevsim 
[ 38.257318][ T66] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim 
[ 38.257550][ T66] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim 
[ 38.257782][ T66] ? nsim_dev_hwstats_init (./include/linux/workqueue.h:817 drivers/net/netdevsim/hwstats.c:442) netdevsim 
[ 38.258026][ T66] nsim_dev_reload_create (drivers/net/netdevsim/dev.c:1450 drivers/net/netdevsim/dev.c:1501) netdevsim 
[ 38.258256][ T66] ? __pfx_nsim_dev_reload_create (drivers/net/netdevsim/dev.c:1462) netdevsim 
[ 38.258481][ T66] ? devlink_params_driverinit_load_new (net/devlink/param.c:833 (discriminator 2)) 
[ 38.258707][ T66] devlink_reload (net/devlink/dev.c:474) 
[ 38.258888][ T66] ? __pfx_devlink_reload (net/devlink/dev.c:446) 
[ 38.259078][ T66] ? devlinks_xa_find_get (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/devlink/core.c:343) 
[ 38.259258][ T66] devlink_pernet_pre_exit (net/devlink/core.c:288 net/devlink/devl_internal.h:114 net/devlink/core.c:513) 
[ 38.259429][ T66] ? __pfx_devlink_pernet_pre_exit (net/devlink/core.c:496) 
[ 38.259658][ T66] cleanup_net (net/core/net_namespace.c:162 net/core/net_namespace.c:632) 
[ 38.259833][ T66] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 38.260018][ T66] ? __pfx_cleanup_net (net/core/net_namespace.c:594) 
[ 38.260204][ T66] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 21)) 
[ 38.260385][ T66] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 38.260557][ T66] ? process_one_work (kernel/workqueue.c:3214) 
[ 38.260737][ T66] process_one_work (kernel/workqueue.c:3238) 
[ 38.260922][ T66] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 38.261112][ T66] ? __pfx_process_one_work (kernel/workqueue.c:3140) 
[ 38.261292][ T66] ? assign_work (kernel/workqueue.c:1200) 
[ 38.261468][ T66] worker_thread (kernel/workqueue.c:3313 kernel/workqueue.c:3400) 
[ 38.261639][ T66] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 38.261864][ T66] ? __pfx_worker_thread (kernel/workqueue.c:3346) 
[ 38.262046][ T66] kthread (kernel/kthread.c:464) 
[ 38.262179][ T66] ? __pfx_kthread (kernel/kthread.c:413) 
[ 38.262354][ T66] ? __pfx_kthread (kernel/kthread.c:413) 
[ 38.262526][ T66] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 38.262694][ T66] ? __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