======================================
| xx__-> [   34.149550][  T431] ------------[ cut here ]------------
| [   34.149740][  T431] workqueue: ovpn is using neither WQ_PERCPU or WQ_UNBOUND. Setting WQ_PERCPU.
| [   34.149978][  T431] WARNING: kernel/workqueue.c:5851 at __alloc_workqueue+0xa8b/0xe40, CPU#0: modprobe/431
| [   34.150238][  T431] Modules linked in: ovpn(+) ip6_udp_tunnel udp_tunnel
[   34.150745][  T431] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   34.150927][  T431] RIP: 0010:__alloc_workqueue (kernel/workqueue.c:5851 (discriminator 7))
[   34.151083][  T431] 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
[   34.151599][  T431] RSP: 0018:ffa00000018577f0 EFLAGS: 00010246
[   34.151771][  T431] RAX: 0000000000000004 RBX: ffffffffc04b7b60 RCX: 1ff400000030aeea
[   34.151979][  T431] RDX: 0000000000000000 RSI: ff1100000c665170 RDI: ffffffffbd4e81e0
[   34.152193][  T431] RBP: 0000000000000000 R08: ffffffffc04b7b64 R09: 0000000000000000
[   34.152412][  T431] R10: 0000000000000000 R11: ff1100000c665190 R12: ffa0000001857890
[   34.152619][  T431] R13: 0000000000000000 R14: ff1100000c665000 R15: ffffffffc04b0ac0
[   34.152825][  T431] FS:  00007f7132c91bc0(0000) GS:ff110000772c8000(0000) knlGS:0000000000000000
[   34.153073][  T431] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   34.153256][  T431] CR2: 00007ffffaedcff8 CR3: 000000000b29f003 CR4: 0000000000771ef0
[   34.153469][  T431] PKRU: 55555554
[   34.153575][  T431] Call Trace:
[   34.153681][  T431]  <TASK>
[   34.153756][  T431]  ? udp_tunnel_nic_cleanup_module (net/ipv4/udp_tunnel_core.c:271) udp_tunnel
[   34.153962][  T431]  alloc_workqueue_noprof (kernel/workqueue.c:5946 kernel/workqueue.c:5962)
[   34.154105][  T431]  ? alloc_workqueue_lockdep_map (kernel/workqueue.c:6014)
[   34.154282][  T431]  ? 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)
[   34.154423][  T431] ovpn_init (drivers/net/ovpn/bind.c:24) ovpn
[   34.154563][  T431]  do_one_initcall (init/main.c:1347)
[   34.154698][  T431]  ? trace_event_raw_event_initcall_level (./include/trace/events/initcall.h:10)
[   34.154869][  T431]  ? kasan_save_track (mm/kasan/common.c:78)
[   34.155011][  T431]  ? do_init_module (./include/linux/slab.h:988 (discriminator 1) kernel/module/main.c:3094 (discriminator 1))
[   34.155148][  T431]  ? kasan_unpoison (mm/kasan/shadow.c:146 mm/kasan/shadow.c:178)
[   34.155305][  T431]  do_init_module (kernel/module/main.c:3106)
[   34.155450][  T431]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   34.155590][  T431]  ? 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))
[   34.155729][  T431]  ? kfree (./include/linux/kasan.h:235 mm/slub.c:2677 mm/slub.c:6377 mm/slub.c:6692)
[   34.155834][  T431]  load_module (kernel/module/main.c:3580)
[   34.155974][  T431]  ? layout_and_allocate.isra.0 (kernel/module/main.c:3005)
[   34.156144][  T431]  ? __ia32_sys_fsconfig (??:?)
[   34.156287][  T431]  ? backing_file_read_iter (fs/backing-file.c:211)
[   34.156431][  T431]  init_module_from_file (kernel/module/main.c:3777)
[   34.156566][  T431]  ? __do_sys_init_module (kernel/module/main.c:3651)
[   34.156786][  T431]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   34.157007][  T431]  ? ovl_dentry_clear_flag (./include/linux/instrumented.h:97 ./include/asm-generic/bitops/instrumented-atomic.h:41 fs/overlayfs/util.c:457)
[   34.157150][  T431]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   34.157305][  T431]  ? 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)
[   34.157538][  T431]  idempotent_init_module (kernel/module/main.c:3789)
[   34.157676][  T431]  ? init_module_from_file (kernel/module/main.c:3778)
[   34.157820][  T431]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   34.157959][  T431]  ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22))
[   34.158186][  T431]  __x64_sys_finit_module (kernel/module/main.c:3815 kernel/module/main.c:3799 kernel/module/main.c:3799)
[   34.158331][  T431]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   34.158510][  T431]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   34.158643][  T431]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[   34.158864][  T431]  ? exc_page_fault (arch/x86/mm/fault.c:1489 (discriminator 3) arch/x86/mm/fault.c:1536 (discriminator 3))
[   34.159090][  T431]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[   34.159264][  T431] RIP: 0033:0x7f7132d8737d
[   34.159406][  T431] 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
[   34.159989][  T431] RSP: 002b:00007ffffaee0118 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[   34.160201][  T431] RAX: ffffffffffffffda RBX: 00005637a1ed69c0 RCX: 00007f7132d8737d
[   34.160419][  T431] RDX: 0000000000000000 RSI: 0000563768b72ffd RDI: 0000000000000007
[   34.160713][  T431] RBP: 00007ffffaee01b0 R08: 0000000000000000 R09: 0000000000000000
[   34.160918][  T431] R10: 0000000000000000 R11: 0000000000000246 R12: 0000563768b72ffd


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