======================================
| xx__-> [   14.221656][  T260] netdevsim netdevsim458 eni458np1: renamed from eth0
| [   14.296907][  T261] netdevsim netdevsim662 eni662np1: renamed from eth1
| [   18.947811][  T254] BUG: using smp_processor_id() in preemptible [00000000] code: busy_poll_test./254
| [ 18.948586][ T254] caller is nsim_queue_uninit (./include/linux/netdevice.h:3023 (discriminator 3) drivers/net/netdevsim/netdev.c:638 (discriminator 3) drivers/net/netdevsim/netdev.c:917 (discriminator 3)) netdevsim 
[   18.949104][  T254] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.949106][  T254] Call Trace:
[   18.949108][  T254]  <TASK>
[ 18.949110][ T254] dump_stack_lvl (lib/dump_stack.c:123) 
[ 18.949121][ T254] check_preemption_disabled (lib/smp_processor_id.c:52) 
[ 18.949129][ T254] nsim_queue_uninit (./include/linux/netdevice.h:3023 (discriminator 3) drivers/net/netdevsim/netdev.c:638 (discriminator 3) drivers/net/netdevsim/netdev.c:917 (discriminator 3)) netdevsim 
[ 18.949148][ T254] ? nsim_destroy (drivers/net/netdevsim/netdev.c:1062) netdevsim 
[ 18.949166][ T254] nsim_destroy (drivers/net/netdevsim/netdev.c:1062) netdevsim 
[ 18.949185][ T254] __nsim_dev_port_del (drivers/net/netdevsim/dev.c:426 drivers/net/netdevsim/dev.c:1429) netdevsim 
[ 18.949202][ T254] nsim_dev_reload_destroy (drivers/net/netdevsim/dev.c:1438 drivers/net/netdevsim/dev.c:1661) netdevsim 
[ 18.949220][ T254] nsim_drv_remove (drivers/net/netdevsim/dev.c:1678) netdevsim 
[ 18.949237][ T254] device_release_driver_internal (drivers/base/dd.c:1274 drivers/base/dd.c:1295) 
[ 18.949244][ T254] ? klist_put (lib/klist.c:220) 
[ 18.949251][ T254] bus_remove_device (./include/linux/kobject.h:193 drivers/base/base.h:73 drivers/base/bus.c:586) 
[ 18.949260][ T254] device_del (drivers/base/core.c:3882) 
[ 18.949268][ T254] ? __pfx_device_del (drivers/base/core.c:3836) 
[ 18.949282][ T254] device_unregister (drivers/base/core.c:3799 drivers/base/core.c:3923) 
[ 18.949286][ T254] del_device_store (drivers/net/netdevsim/bus.c:230) netdevsim 
[ 18.949304][ T254] ? __pfx_del_device_store (drivers/net/netdevsim/bus.c:197) netdevsim 
[ 18.949317][ T254] ? sysfs_file_kobj (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 ./include/linux/rcupdate.h:1155 fs/sysfs/file.c:24) 
[ 18.949324][ T254] ? sysfs_file_kobj (fs/sysfs/file.c:26) 
[ 18.949333][ T254] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:138) 
[ 18.949336][ T254] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 18.949344][ T254] vfs_write (fs/read_write.c:594 fs/read_write.c:686) 
[ 18.949355][ T254] ? __pfx_vfs_write (fs/read_write.c:667) 
[ 18.949366][ T254] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 18.949385][ T254] ksys_write (fs/read_write.c:738) 
[ 18.949390][ T254] ? __pfx_ksys_write (fs/read_write.c:728) 
[ 18.949404][ T254] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 18.949411][ T254] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   18.949415][  T254] RIP: 0033:0x7fe5bba1fb77
[ 18.949419][ T254] 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
[   18.949422][  T254] RSP: 002b:00007ffccdf508f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   18.949426][  T254] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007fe5bba1fb77
[   18.949428][  T254] RDX: 0000000000000004 RSI: 000055fefc30da30 RDI: 0000000000000001
[   18.949429][  T254] RBP: 000055fefc30da30 R08: 0000000000000000 R09: 00007fe5bba924e0
[   18.949431][  T254] R10: 00007fe5bba923e0 R11: 0000000000000246 R12: 0000000000000004
[   18.949432][  T254] R13: 00007fe5bbadb760 R14: 0000000000000004 R15: 00007fe5bbad69c0
| [   18.949432][  T254] R13: 00007fe5bbadb760 R14: 0000000000000004 R15: 00007fe5bbad69c0
| [   18.949450][  T254]  </TASK>
| [   19.456444][  T321] BUG: using smp_processor_id() in preemptible [00000000] code: modprobe/321
| [ 19.457233][ T321] caller is nsim_queue_uninit (./include/linux/netdevice.h:3023 (discriminator 3) drivers/net/netdevsim/netdev.c:638 (discriminator 3) drivers/net/netdevsim/netdev.c:917 (discriminator 3)) netdevsim 
[   19.457650][  T321] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   19.457652][  T321] Call Trace:
[   19.457654][  T321]  <TASK>
[ 19.457656][ T321] dump_stack_lvl (lib/dump_stack.c:123) 
[ 19.457666][ T321] check_preemption_disabled (lib/smp_processor_id.c:52) 
[ 19.457673][ T321] nsim_queue_uninit (./include/linux/netdevice.h:3023 (discriminator 3) drivers/net/netdevsim/netdev.c:638 (discriminator 3) drivers/net/netdevsim/netdev.c:917 (discriminator 3)) netdevsim 
[ 19.457691][ T321] ? nsim_destroy (drivers/net/netdevsim/netdev.c:1062) netdevsim 
[ 19.457708][ T321] nsim_destroy (drivers/net/netdevsim/netdev.c:1062) netdevsim 
[ 19.457726][ T321] __nsim_dev_port_del (drivers/net/netdevsim/dev.c:426 drivers/net/netdevsim/dev.c:1429) netdevsim 
[ 19.457742][ T321] nsim_dev_reload_destroy (drivers/net/netdevsim/dev.c:1438 drivers/net/netdevsim/dev.c:1661) netdevsim 
[ 19.457760][ T321] nsim_drv_remove (drivers/net/netdevsim/dev.c:1678) netdevsim 
[ 19.457776][ T321] device_release_driver_internal (drivers/base/dd.c:1274 drivers/base/dd.c:1295) 
[ 19.457783][ T321] ? klist_put (lib/klist.c:220) 
[ 19.457792][ T321] bus_remove_device (./include/linux/kobject.h:193 drivers/base/base.h:73 drivers/base/bus.c:586) 
[ 19.457801][ T321] device_del (drivers/base/core.c:3882) 
[ 19.457808][ T321] ? __pfx_device_del (drivers/base/core.c:3836) 
[ 19.457821][ T321] device_unregister (drivers/base/core.c:3799 drivers/base/core.c:3923) 
[ 19.457825][ T321] nsim_bus_exit (drivers/net/netdevsim/bus.c:501) netdevsim 
[ 19.457845][ T321] nsim_module_exit (drivers/net/netdevsim/netdev.c:109) netdevsim 
[ 19.457860][ T321] __do_sys_delete_module (kernel/module/main.c:805) 
[ 19.457866][ T321] ? __pfx___do_sys_delete_module (kernel/module/main.c:750) 
[ 19.457878][ T321] ? __pfx_fput_close_sync (fs/file_table.c:568) 
[ 19.457888][ T321] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 19.457895][ T321] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 19.457902][ T321] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   19.457905][  T321] RIP: 0033:0x7fe96b1035db
[ 19.457910][ T321] Code: 73 01 c3 48 8b 0d 25 98 1b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 b0 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d f5 97 1b 00 f7 d8 64 89 01 48
All code
========
   0:	73 01                	jae    0x3
   2:	c3                   	ret
   3:	48 8b 0d 25 98 1b 00 	mov    0x1b9825(%rip),%rcx        # 0x1b982f
   a:	f7 d8                	neg    %eax
   c:	64 89 01             	mov    %eax,%fs:(%rcx)
   f:	48 83 c8 ff          	or     $0xffffffffffffffff,%rax
  13:	c3                   	ret
  14:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  1b:	00 00 00 
  1e:	90                   	nop
  1f:	f3 0f 1e fa          	endbr64
  23:	b8 b0 00 00 00       	mov    $0xb0,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax		<-- trapping instruction
  30:	73 01                	jae    0x33
  32:	c3                   	ret
  33:	48 8b 0d f5 97 1b 00 	mov    0x1b97f5(%rip),%rcx        # 0x1b982f
  3a:	f7 d8                	neg    %eax
  3c:	64 89 01             	mov    %eax,%fs:(%rcx)
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax
   6:	73 01                	jae    0x9
   8:	c3                   	ret
   9:	48 8b 0d f5 97 1b 00 	mov    0x1b97f5(%rip),%rcx        # 0x1b9805
  10:	f7 d8                	neg    %eax
  12:	64 89 01             	mov    %eax,%fs:(%rcx)
  15:	48                   	rex.W
[   19.457912][  T321] RSP: 002b:00007fffc8a20058 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0
[   19.457916][  T321] RAX: ffffffffffffffda RBX: 000055d33420ea90 RCX: 00007fe96b1035db
[   19.457918][  T321] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 000055d33420eaf8
[   19.457919][  T321] RBP: 000055d33420ea90 R08: 0000000000000000 R09: 0000000000000000
[   19.457921][  T321] R10: 00007fe96b262ac0 R11: 0000000000000206 R12: 000055d33420eaf8


Finger prints:
check_preemption_disabled:nsim_queue_uninit:nsim_destroy:__nsim_dev_port_del:nsim_dev_reload_destroy