======================================
| xx__-> [   10.733074][  T208] ------------[ cut here ]------------
| [   10.733296][  T208] workqueue: ovpn is using neither WQ_PERCPU or WQ_UNBOUND. Setting WQ_PERCPU.
| [   10.733517][  T208] WARNING: kernel/workqueue.c:5851 at __alloc_workqueue+0xa8b/0xe40, CPU#0: modprobe/208
| [   10.733751][  T208] Modules linked in: ovpn(+) ip6_udp_tunnel udp_tunnel
[   10.734417][  T208] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   10.734580][  T208] RIP: 0010:__alloc_workqueue (kernel/workqueue.c:5851 (discriminator 7))
[   10.734719][  T208] Code: 80 fb 01 0f 87 24 3e 9f ff 83 e3 01 0f 84 2f 3e 9f ff 89 e8 25 02 01 00 00 0f 85 b8 f7 ff ff 48 8d 3d c5 ca ea 03 48 8b 34 24 <67> 48 0f b9 3a 31 db 81 cd 00 01 00 00 e9 ab f7 ff ff 90 0f 0b 90
All code
========
   0:	80 fb 01             	cmp    $0x1,%bl
   3:	0f 87 24 3e 9f ff    	ja     0xffffffffff9f3e2d
   9:	83 e3 01             	and    $0x1,%ebx
   c:	0f 84 2f 3e 9f ff    	je     0xffffffffff9f3e41
  12:	89 e8                	mov    %ebp,%eax
  14:	25 02 01 00 00       	and    $0x102,%eax
  19:	0f 85 b8 f7 ff ff    	jne    0xfffffffffffff7d7
  1f:	48 8d 3d c5 ca ea 03 	lea    0x3eacac5(%rip),%rdi        # 0x3eacaeb
  26:	48 8b 34 24          	mov    (%rsp),%rsi
  2a:*	67 48 0f b9 3a       	ud1    (%edx),%rdi		<-- trapping instruction
  2f:	31 db                	xor    %ebx,%ebx
  31:	81 cd 00 01 00 00    	or     $0x100,%ebp
  37:	e9 ab f7 ff ff       	jmp    0xfffffffffffff7e7
  3c:	90                   	nop
  3d:	0f 0b                	ud2
  3f:	90                   	nop

Code starting with the faulting instruction
===========================================
   0:	67 48 0f b9 3a       	ud1    (%edx),%rdi
   5:	31 db                	xor    %ebx,%ebx
   7:	81 cd 00 01 00 00    	or     $0x100,%ebp
   d:	e9 ab f7 ff ff       	jmp    0xfffffffffffff7bd
  12:	90                   	nop
  13:	0f 0b                	ud2
  15:	90                   	nop
[   10.735204][  T208] RSP: 0018:ffa00000015877f0 EFLAGS: 00010246
[   10.735375][  T208] RAX: 0000000000000004 RBX: ffffffffc0550b60 RCX: 1ff40000002b0eea
[   10.735571][  T208] RDX: 0000000000000000 RSI: ff1100000d21fb70 RDI: ffffffff8cce81e0
[   10.735763][  T208] RBP: 0000000000000000 R08: ffffffffc0550b64 R09: 0000000000000000
[   10.735957][  T208] R10: 0000000000000000 R11: ff1100000d21fb90 R12: ffa0000001587890
[   10.736160][  T208] R13: 0000000000000000 R14: ff1100000d21fa00 R15: ffffffffc0549ac0
[   10.736362][  T208] FS:  00007fdea2dfcbc0(0000) GS:ff110000a7ac8000(0000) knlGS:0000000000000000
[   10.736589][  T208] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   10.736752][  T208] CR2: 00007f42a0d7b1a0 CR3: 000000000c0c3003 CR4: 0000000000771ef0
[   10.736949][  T208] PKRU: 55555554
[   10.737055][  T208] Call Trace:
[   10.737155][  T208]  <TASK>
[   10.737231][  T208]  ? udp_tunnel_nic_cleanup_module (net/ipv4/udp_tunnel_core.c:271) udp_tunnel
[   10.737423][  T208]  alloc_workqueue_noprof (kernel/workqueue.c:5946 kernel/workqueue.c:5962)
[   10.737553][  T208]  ? alloc_workqueue_lockdep_map (kernel/workqueue.c:6014)
[   10.737715][  T208]  ? do_one_initcall (./include/linux/instrumented.h:82 ./include/asm-generic/bitops/instrumented-non-atomic.h:141 ./include/linux/cpumask.h:651 ./include/linux/cpumask.h:1233 ./include/trace/events/initcall.h:27 init/main.c:1346)
[   10.737845][  T208] ovpn_init (drivers/net/ovpn/bind.c:24) ovpn
[   10.737979][  T208]  do_one_initcall (init/main.c:1347)
[   10.738113][  T208]  ? trace_event_raw_event_initcall_level (./include/trace/events/initcall.h:10)
[   10.738279][  T208]  ? kasan_save_track (mm/kasan/common.c:78)
[   10.738411][  T208]  ? do_init_module (./include/linux/slab.h:988 (discriminator 1) kernel/module/main.c:3094 (discriminator 1))
[   10.738539][  T208]  ? kasan_unpoison (mm/kasan/shadow.c:146 mm/kasan/shadow.c:178)
[   10.738669][  T208]  do_init_module (kernel/module/main.c:3106)
[   10.738799][  T208]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   10.738932][  T208]  ? free_module (./include/trace/events/module.h:50 (discriminator 19) ./include/trace/events/module.h:50 (discriminator 19) kernel/module/main.c:1419 (discriminator 19))
[   10.739070][  T208]  ? kfree (./include/linux/kasan.h:235 mm/slub.c:2677 mm/slub.c:6377 mm/slub.c:6692)
[   10.739169][  T208]  load_module (kernel/module/main.c:3580)
[   10.739308][  T208]  ? layout_and_allocate.isra.0 (kernel/module/main.c:3005)
[   10.739468][  T208]  ? __ia32_sys_fsconfig (??:?)
[   10.739611][  T208]  ? backing_file_read_iter (fs/backing-file.c:211)
[   10.739744][  T208]  init_module_from_file (kernel/module/main.c:3777)
[   10.739877][  T208]  ? __do_sys_init_module (kernel/module/main.c:3651)
[   10.740014][  T208]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   10.740144][  T208]  ? ovl_set_dir_cache (fs/overlayfs/util.c:447 (discriminator 1))
[   10.740286][  T208]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   10.740417][  T208]  ? do_raw_spin_unlock (./include/linux/instrumented.h:82 ./include/linux/atomic/atomic-instrumented.h:32 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141)
[   10.740545][  T208]  idempotent_init_module (kernel/module/main.c:3789)
[   10.740673][  T208]  ? init_module_from_file (kernel/module/main.c:3778)
[   10.740804][  T208]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   10.740937][  T208]  ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22))
[   10.741075][  T208]  __x64_sys_finit_module (kernel/module/main.c:3815 kernel/module/main.c:3799 kernel/module/main.c:3799)
[   10.741205][  T208]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   10.741372][  T208]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   10.741501][  T208]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[   10.741627][  T208]  ? exc_page_fault (arch/x86/mm/fault.c:1489 (discriminator 3) arch/x86/mm/fault.c:1536 (discriminator 3))
[   10.741753][  T208]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   10.741916][  T208] RIP: 0033:0x7fdea2ef237d
[   10.742058][  T208] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 4b aa 0f 00 f7 d8 64 89 01 48
All code
========
   0:	ff c3                	inc    %ebx
   2:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
   9:	00 00 00 
   c:	90                   	nop
   d:	f3 0f 1e fa          	endbr64
  11:	48 89 f8             	mov    %rdi,%rax
  14:	48 89 f7             	mov    %rsi,%rdi
  17:	48 89 d6             	mov    %rdx,%rsi
  1a:	48 89 ca             	mov    %rcx,%rdx
  1d:	4d 89 c2             	mov    %r8,%r10
  20:	4d 89 c8             	mov    %r9,%r8
  23:	4c 8b 4c 24 08       	mov    0x8(%rsp),%r9
  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 4b aa 0f 00 	mov    0xfaa4b(%rip),%rcx        # 0xfaa85
  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 4b aa 0f 00 	mov    0xfaa4b(%rip),%rcx        # 0xfaa5b
  10:	f7 d8                	neg    %eax
  12:	64 89 01             	mov    %eax,%fs:(%rcx)
  15:	48                   	rex.W
[   10.742523][  T208] RSP: 002b:00007ffdd4230928 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[   10.742718][  T208] RAX: ffffffffffffffda RBX: 000056381fc6f9c0 RCX: 00007fdea2ef237d
[   10.742916][  T208] RDX: 0000000000000000 RSI: 00005637f3630ffd RDI: 0000000000000007
[   10.743115][  T208] RBP: 00007ffdd42309c0 R08: 0000000000000000 R09: 0000000000000000
[   10.743315][  T208] R10: 0000000000000000 R11: 0000000000000246 R12: 00005637f3630ffd


Finger prints:
__alloc_workqueue:alloc_workqueue_noprof:ovpn_init:do_one_initcall:do_init_module