======================================
| 0
| xx__-> [   20.316885][  T266] ------------[ cut here ]------------
| [ 20.318990][ T266] WARNING: CPU: 3 PID: 266 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) 
| [   20.319990][  T266] Modules linked in:
[   20.321152][  T266] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 20.321756][ T266] 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) 
[ 20.322267][ T266] Code: 00 00 8b 05 a7 0e 19 02 85 c0 0f 84 52 fe ff ff 48 8d bb 80 0c 00 00 be ff ff ff ff e8 ea 9c 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 a7 0e 19 02    	mov    0x2190ea7(%rip),%eax        # 0x2190eaf
   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 ea 9c 74 00       	call   0x749d0b
  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
[   20.323968][  T266] RSP: 0018:ffffc90000b37930 EFLAGS: 00010246
[   20.324593][  T266] RAX: 0000000000000000 RBX: ffff8880021cc000 RCX: 0000000000000001
[   20.325369][  T266] RDX: 0000000000000000 RSI: ffffffffb3688ba1 RDI: ffffffffb2e555a0
[   20.326078][  T266] RBP: ffffc90000b37a18 R08: ffff8880021cc008 R09: 0000000000000000
[   20.326799][  T266] R10: ffffc90000b37a48 R11: ffffffffb4450068 R12: 1ffff92000166f2a
[   20.327524][  T266] R13: 00000000000005f0 R14: ffffc90000b37a48 R15: ffffc90000b37d40
[   20.328230][  T266] FS:  00007f8f142ed740(0000) GS:ffff888080c71000(0000) knlGS:0000000000000000
[   20.329071][  T266] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   20.329681][  T266] CR2: 00005645438215e6 CR3: 000000000be1d003 CR4: 0000000000772ef0
[   20.330403][  T266] PKRU: 55555554
[   20.330761][  T266] Call Trace:
[   20.331118][  T266]  <TASK>
[ 20.331379][ T266] ? __pfx_netif_set_mtu_ext (net/core/dev.c:9607) 
[ 20.331855][ T266] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 20.332336][ T266] ? validate_chain (kernel/locking/lockdep.c:3804 kernel/locking/lockdep.c:3824 kernel/locking/lockdep.c:3879) 
[ 20.332820][ T266] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 20.333301][ T266] ? validate_chain (kernel/locking/lockdep.c:3804 kernel/locking/lockdep.c:3824 kernel/locking/lockdep.c:3879) 
[ 20.333778][ T266] netif_set_mtu (net/core/dev.c:9652) 
[ 20.334271][ T266] ? __pfx_netif_set_mtu (net/core/dev.c:9647) 
[ 20.334963][ T266] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.335343][ T266] dev_set_mtu (./include/net/netdev_lock.h:30 ./include/net/netdev_lock.h:47 net/core/dev_api.c:249) 
[ 20.335668][ T266] dev_ifsioc (net/core/dev_ioctl.c:572) 
[ 20.336142][ T266] ? __pfx_dev_ifsioc (net/core/dev_ioctl.c:553) 
[ 20.336627][ T266] ? __pfx___mutex_lock (kernel/locking/mutex.c:746) 
[ 20.337109][ T266] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 20.337589][ T266] ? dev_load (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/dev_ioctl.c:678) 
[ 20.337943][ T266] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 20.338441][ T266] dev_ioctl (net/core/dev_ioctl.c:824) 
[ 20.338802][ T266] sock_do_ioctl (net/socket.c:1252) 
[ 20.339284][ T266] ? __pfx_sock_do_ioctl (net/socket.c:1230) 
[ 20.339756][ T266] ? __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) 
[ 20.340224][ T266] ? lock_vma_under_rcu (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 mm/mmap_lock.c:171) 
[ 20.340707][ T266] ? __lock_release (kernel/locking/lockdep.c:5585) 
[ 20.341202][ T266] sock_ioctl (net/socket.c:1362) 
[ 20.341579][ T266] ? __pfx_sock_ioctl (net/socket.c:1266) 
[ 20.342047][ T266] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 20.342528][ T266] ? 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) 
[ 20.342999][ T266] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 20.343486][ T266] ? 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) 
[ 20.343971][ T266] __x64_sys_ioctl (fs/ioctl.c:52 fs/ioctl.c:907 fs/ioctl.c:893 fs/ioctl.c:893) 
[ 20.344493][ T266] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 20.344777][ T266] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   20.345117][  T266] RIP: 0033:0x7f8f143f3e4b
[ 20.345407][ T266] 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
[   20.346386][  T266] RSP: 002b:00007fffac69ad28 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[   20.346799][  T266] RAX: ffffffffffffffda RBX: 00007fffac69b088 RCX: 00007f8f143f3e4b
[   20.347210][  T266] RDX: 00007fffac69ad80 RSI: 0000000000008922 RDI: 0000000000000007
[   20.347641][  T266] RBP: 00007fffac69b098 R08: 1999999999999999 R09: 0000000000000000
[   20.348066][  T266] R10: 00007f8f1448eac0 R11: 0000000000000246 R12: 00007fffac69c990


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