======================================
| xx__-> [   13.320459][  T210] dirname (210) used greatest stack depth: 24080 bytes left
| [   18.894013][  T259] ------------[ cut here ]------------
| [ 18.894556][ T259] WARNING: CPU: 0 PID: 259 at ./include/net/netdev_lock.h:17 netif_set_mtu_ext (./include/net/netdev_lock.h:17 ./include/net/netdev_lock.h:15 ./include/net/netdev_lock.h:25 net/core/dev.c:9610) 
| [   18.895250][  T259] Modules linked in:
[   18.896129][  T259] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 18.896555][ T259] RIP: 0010:netif_set_mtu_ext (./include/net/netdev_lock.h:17 ./include/net/netdev_lock.h:15 ./include/net/netdev_lock.h:25 net/core/dev.c:9610) 
[ 18.896933][ T259] Code: 00 00 8b 05 c7 0f 19 02 85 c0 0f 84 52 fe ff ff 48 8d bb 80 0c 00 00 be ff ff ff ff e8 0a 9e 74 00 85 c0 0f 85 39 fe ff ff 90 <0f> 0b 90 e9 30 fe ff ff 48 b8 00 00 00 00 00 fc ff df 4c 89 fa 48
All code
========
   0:	00 00                	add    %al,(%rax)
   2:	8b 05 c7 0f 19 02    	mov    0x2190fc7(%rip),%eax        # 0x2190fcf
   8:	85 c0                	test   %eax,%eax
   a:	0f 84 52 fe ff ff    	je     0xfffffffffffffe62
  10:	48 8d bb 80 0c 00 00 	lea    0xc80(%rbx),%rdi
  17:	be ff ff ff ff       	mov    $0xffffffff,%esi
  1c:	e8 0a 9e 74 00       	call   0x749e2b
  21:	85 c0                	test   %eax,%eax
  23:	0f 85 39 fe ff ff    	jne    0xfffffffffffffe62
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	e9 30 fe ff ff       	jmp    0xfffffffffffffe62
  32:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  39:	fc ff df 
  3c:	4c 89 fa             	mov    %r15,%rdx
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	e9 30 fe ff ff       	jmp    0xfffffffffffffe38
   8:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   f:	fc ff df 
  12:	4c 89 fa             	mov    %r15,%rdx
  15:	48                   	rex.W
[   18.897995][  T259] RSP: 0018:ffffc90000a67930 EFLAGS: 00010246
[   18.898387][  T259] RAX: 0000000000000000 RBX: ffff888009304000 RCX: 0000000000000001
[   18.898870][  T259] RDX: 0000000000000000 RSI: ffffffff95c88ba1 RDI: ffffffff954555a0
[   18.899340][  T259] RBP: ffffc90000a67a18 R08: ffff888009304008 R09: 0000000000000000
[   18.899789][  T259] R10: ffffc90000a67a48 R11: ffffffff96a50068 R12: 1ffff9200014cf2a
[   18.900281][  T259] R13: 00000000000005f0 R14: ffffc90000a67a48 R15: ffffc90000a67d40
[   18.900775][  T259] FS:  00007f26c5129740(0000) GS:ffff88809e4f1000(0000) knlGS:0000000000000000
[   18.901528][  T259] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   18.901891][  T259] CR2: 000055d68e77b5e6 CR3: 000000000c04d002 CR4: 0000000000772ef0
[   18.902319][  T259] PKRU: 55555554
[   18.902529][  T259] Call Trace:
[   18.902752][  T259]  <TASK>
[ 18.902900][ T259] ? __pfx_netif_set_mtu_ext (net/core/dev.c:9607) 
[ 18.903197][ T259] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 18.903488][ T259] ? validate_chain (kernel/locking/lockdep.c:3804 kernel/locking/lockdep.c:3824 kernel/locking/lockdep.c:3879) 
[ 18.903778][ T259] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 18.904049][ T259] ? validate_chain (kernel/locking/lockdep.c:3804 kernel/locking/lockdep.c:3824 kernel/locking/lockdep.c:3879) 
[ 18.904329][ T259] netif_set_mtu (net/core/dev.c:9652) 
[ 18.904604][ T259] ? __pfx_netif_set_mtu (net/core/dev.c:9647) 
[ 18.904885][ T259] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.905187][ T259] dev_set_mtu (./include/net/netdev_lock.h:30 ./include/net/netdev_lock.h:47 net/core/dev_api.c:249) 
[ 18.905403][ T259] dev_ifsioc (net/core/dev_ioctl.c:572) 
[ 18.905687][ T259] ? __pfx_dev_ifsioc (net/core/dev_ioctl.c:553) 
[ 18.905961][ T259] ? __pfx___mutex_lock (kernel/locking/mutex.c:746) 
[ 18.906250][ T259] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 18.906521][ T259] ? dev_load (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/dev_ioctl.c:678) 
[ 18.906739][ T259] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 18.907022][ T259] dev_ioctl (net/core/dev_ioctl.c:824) 
[ 18.907239][ T259] sock_do_ioctl (net/socket.c:1252) 
[ 18.907516][ T259] ? __pfx_sock_do_ioctl (net/socket.c:1230) 
[ 18.907799][ T259] ? __pmd_alloc (./include/linux/mm.h:1512 ./include/linux/mm.h:1738 ./include/linux/mm.h:1748 ./include/linux/vmstat.h:578 ./include/linux/vmstat.h:610 ./include/linux/mm.h:2971 ./include/linux/mm.h:2976 ./include/asm-generic/pgalloc.h:160 mm/memory.c:6477) 
[ 18.908071][ T259] ? lock_vma_under_rcu (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 mm/mmap_lock.c:171) 
[ 18.908347][ T259] ? __lock_release (kernel/locking/lockdep.c:5585) 
[ 18.908634][ T259] sock_ioctl (net/socket.c:1362) 
[ 18.908843][ T259] ? __pfx_sock_ioctl (net/socket.c:1266) 
[ 18.909114][ T259] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 18.909399][ T259] ? exc_page_fault (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:151 arch/x86/mm/fault.c:1484 arch/x86/mm/fault.c:1532) 
[ 18.909679][ T259] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 18.909959][ T259] ? exc_page_fault (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:151 arch/x86/mm/fault.c:1484 arch/x86/mm/fault.c:1532) 
[ 18.910249][ T259] __x64_sys_ioctl (fs/ioctl.c:52 fs/ioctl.c:907 fs/ioctl.c:893 fs/ioctl.c:893) 
[ 18.910540][ T259] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 18.910816][ T259] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   18.911169][  T259] RIP: 0033:0x7f26c522fe4b
[ 18.911462][ T259] Code: ff ff ff 85 c0 79 9b 49 c7 c4 ff ff ff ff 5b 5d 4c 89 e0 41 5c c3 66 0f 1f 84 00 00 00 00 00 f3 0f 1e fa b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 7d 4f 0f 00 f7 d8 64 89 01 48
All code
========
   0:	ff                   	(bad)
   1:	ff                   	(bad)
   2:	ff 85 c0 79 9b 49    	incl   0x499b79c0(%rbp)
   8:	c7 c4 ff ff ff ff    	mov    $0xffffffff,%esp
   e:	5b                   	pop    %rbx
   f:	5d                   	pop    %rbp
  10:	4c 89 e0             	mov    %r12,%rax
  13:	41 5c                	pop    %r12
  15:	c3                   	ret
  16:	66 0f 1f 84 00 00 00 	nopw   0x0(%rax,%rax,1)
  1d:	00 00 
  1f:	f3 0f 1e fa          	endbr64
  23:	b8 10 00 00 00       	mov    $0x10,%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 7d 4f 0f 00 	mov    0xf4f7d(%rip),%rcx        # 0xf4fb7
  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 7d 4f 0f 00 	mov    0xf4f7d(%rip),%rcx        # 0xf4f8d
  10:	f7 d8                	neg    %eax
  12:	64 89 01             	mov    %eax,%fs:(%rcx)
  15:	48                   	rex.W
[   18.912475][  T259] RSP: 002b:00007ffc6388f288 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[   18.912887][  T259] RAX: ffffffffffffffda RBX: 00007ffc6388f5e8 RCX: 00007f26c522fe4b
[   18.913308][  T259] RDX: 00007ffc6388f2e0 RSI: 0000000000008922 RDI: 0000000000000007
[   18.913731][  T259] RBP: 00007ffc6388f5f8 R08: 1999999999999999 R09: 0000000000000000
[   18.914159][  T259] R10: 00007f26c52caac0 R11: 0000000000000246 R12: 00007ffc6388f9a0


Finger prints:
netif_set_mtu_ext:netif_set_mtu:dev_set_mtu:dev_ifsioc:dev_ioctl