======================================
| xx__-> [  318.406262][ T2252] ------------[ cut here ]------------
| [  318.406441][ T2252] workqueue: ovpn is using neither WQ_PERCPU or WQ_UNBOUND. Setting WQ_PERCPU.
| [  318.407131][ T2252] WARNING: kernel/workqueue.c:5851 at __alloc_workqueue+0xa8b/0xe40, CPU#1: modprobe/2252
| [  318.407356][ T2252] Modules linked in: ovpn(+) ip6_udp_tunnel udp_tunnel 8021q
[  318.407943][ T2252] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  318.408101][ T2252] RIP: 0010:__alloc_workqueue (kernel/workqueue.c:5851 (discriminator 7))
[  318.408234][ T2252] 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
[  318.408798][ T2252] RSP: 0018:ffa00000024977f0 EFLAGS: 00010246
[  318.408992][ T2252] RAX: 0000000000000004 RBX: ffffffffc0525b60 RCX: 1ff4000000492eea
[  318.409213][ T2252] RDX: 0000000000000000 RSI: ff11000008dd8970 RDI: ffffffff902e81e0
[  318.409406][ T2252] RBP: 0000000000000000 R08: ffffffffc0525b64 R09: 0000000000000000
[  318.409597][ T2252] R10: 0000000000000000 R11: ff11000008dd8990 R12: ffa0000002497890
[  318.409843][ T2252] R13: 0000000000000000 R14: ff11000008dd8800 R15: ffffffffc051eac0
[  318.410053][ T2252] FS:  00007f7b52dbbbc0(0000) GS:ff110000a4548000(0000) knlGS:0000000000000000
[  318.410280][ T2252] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  318.410445][ T2252] CR2: 000056259be183c0 CR3: 000000000f2c7006 CR4: 0000000000771ef0
[  318.410642][ T2252] PKRU: 55555554
[  318.410792][ T2252] Call Trace:
[  318.410888][ T2252]  <TASK>
[  318.410971][ T2252]  ? ovpn_cleanup (drivers/net/ovpn/bind.c:53 (discriminator 10)) ovpn
[  318.411106][ T2252]  alloc_workqueue_noprof (kernel/workqueue.c:5946 kernel/workqueue.c:5962)
[  318.411233][ T2252]  ? alloc_workqueue_lockdep_map (kernel/workqueue.c:6014)
[  318.411394][ T2252]  ? 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)
[  318.411521][ T2252] ovpn_init (drivers/net/ovpn/bind.c:24) ovpn
[  318.411646][ T2252]  do_one_initcall (init/main.c:1347)
[  318.411827][ T2252]  ? trace_event_raw_event_initcall_level (./include/trace/events/initcall.h:10)
[  318.411998][ T2252]  ? kasan_save_track (mm/kasan/common.c:78)
[  318.412128][ T2252]  ? do_init_module (./include/linux/slab.h:988 (discriminator 1) kernel/module/main.c:3094 (discriminator 1))
[  318.412251][ T2252]  ? kasan_unpoison (mm/kasan/shadow.c:146 mm/kasan/shadow.c:178)
[  318.412379][ T2252]  do_init_module (kernel/module/main.c:3106)
[  318.412505][ T2252]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[  318.412641][ T2252]  ? 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))
[  318.412885][ T2252]  ? kfree (./include/linux/kasan.h:235 mm/slub.c:2677 mm/slub.c:6377 mm/slub.c:6692)
[  318.413028][ T2252]  load_module (kernel/module/main.c:3580)
[  318.413190][ T2252]  ? layout_and_allocate.isra.0 (kernel/module/main.c:3005)
[  318.413366][ T2252]  ? __ia32_sys_fsconfig (??:?)
[  318.413500][ T2252]  ? backing_file_read_iter (fs/backing-file.c:211)
[  318.413630][ T2252]  init_module_from_file (kernel/module/main.c:3777)
[  318.413815][ T2252]  ? __do_sys_init_module (kernel/module/main.c:3651)
[  318.413951][ T2252]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  318.414084][ T2252]  ? ovl_dentry_test_flag (fs/overlayfs/util.c:463)
[  318.414216][ T2252]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[  318.414346][ T2252]  ? 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)
[  318.414477][ T2252]  idempotent_init_module (kernel/module/main.c:3789)
[  318.414605][ T2252]  ? init_module_from_file (kernel/module/main.c:3778)
[  318.414767][ T2252]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  318.414898][ T2252]  ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22))
[  318.415059][ T2252]  __x64_sys_finit_module (kernel/module/main.c:3815 kernel/module/main.c:3799 kernel/module/main.c:3799)
[  318.415200][ T2252]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[  318.415369][ T2252]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  318.415503][ T2252]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[  318.415639][ T2252]  ? exc_page_fault (arch/x86/mm/fault.c:1489 (discriminator 3) arch/x86/mm/fault.c:1536 (discriminator 3))
[  318.415782][ T2252]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[  318.416048][ T2252] RIP: 0033:0x7f7b52eb137d
[  318.416189][ T2252] 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
[  318.416748][ T2252] RSP: 002b:00007ffea49daaa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[  318.416949][ T2252] RAX: ffffffffffffffda RBX: 0000558aedc369c0 RCX: 00007f7b52eb137d
[  318.417138][ T2252] RDX: 0000000000000000 RSI: 0000558ab605fffd RDI: 0000000000000007
[  318.417410][ T2252] RBP: 00007ffea49dab40 R08: 0000000000000000 R09: 0000000000000000
[  318.417601][ T2252] R10: 0000000000000000 R11: 0000000000000246 R12: 0000558ab605fffd


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