vfs_mkdir+0x59a/0x8d0
 do_mkdirat+0x19f/0x3d0
 __x64_sys_mkdir+0xf3/0x140
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 UID: 0 PID: 14 Comm: ksoftirqd/0 Tainted: G        W           6.17.0-rc3-next-20250829 #1 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:dst_dev_put+0x21/0x250
Code: 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 54 55 53 48 89 fb e8 40 c6 a8 fd 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 b5 01 00 00 48 8d 7b 3a 48 8b 2b 48 b8 00 00 00
RSP: 0018:ffff888009617bc8 EFLAGS: 00010257
RAX: dffffc0000000000 RBX: 0000000000000005 RCX: ffffffff84103977
RDX: 0000000000000000 RSI: ffffffff83cb2140 RDI: 0000000000000005
RBP: dffffc0000000000 R08: 0000000000000000 R09: fffffbfff0c8758a
R10: 0000000000000000 R11: 0000000000000001 R12: fffffbfff0b0a4ac
R13: 0000607f1a630540 R14: 0000607f1a630540 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880e55dd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f533d93b000 CR3: 000000000ec5b000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 rt_fibinfo_free_cpus.part.0+0xdb/0x1a0
 fib_nh_common_release+0xa8/0x2c0
 free_fib_info_rcu+0x1cd/0x430
 rcu_core+0x7c8/0x1800
 handle_softirqs+0x1b1/0x770
 run_ksoftirqd+0x2e/0x60
 smpboot_thread_fn+0x41d/0x9d0
 kthread+0x3c8/0x740
 ret_from_fork+0x34b/0x430
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dst_dev_put+0x21/0x250
Code: 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 54 55 53 48 89 fb e8 40 c6 a8 fd 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 b5 01 00 00 48 8d 7b 3a 48 8b 2b 48 b8 00 00 00
RSP: 0018:ffff888009617bc8 EFLAGS: 00010257
RAX: dffffc0000000000 RBX: 0000000000000005 RCX: ffffffff84103977
RDX: 0000000000000000 RSI: ffffffff83cb2140 RDI: 0000000000000005
RBP: dffffc0000000000 R08: 0000000000000000 R09: fffffbfff0c8758a
R10: 0000000000000000 R11: 0000000000000001 R12: fffffbfff0b0a4ac
R13: 0000607f1a630540 R14: 0000607f1a630540 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880e55dd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f533d93b000 CR3: 000000000ec5b000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	90                   	nop
   1:	90                   	nop
   2:	90                   	nop
   3:	90                   	nop
   4:	90                   	nop
   5:	90                   	nop
   6:	90                   	nop
   7:	90                   	nop
   8:	90                   	nop
   9:	f3 0f 1e fa          	endbr64
   d:	41 54                	push   %r12
   f:	55                   	push   %rbp
  10:	53                   	push   %rbx
  11:	48 89 fb             	mov    %rdi,%rbx
  14:	e8 40 c6 a8 fd       	callq  0xfda8c659
  19:	48 89 da             	mov    %rbx,%rdx
  1c:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  23:	fc ff df
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 b5 01 00 00    	jne    0x1e9
  34:	48 8d 7b 3a          	lea    0x3a(%rbx),%rdi
  38:	48 8b 2b             	mov    (%rbx),%rbp
  3b:	48                   	rex.W
  3c:	b8                   	.byte 0xb8
  3d:	00 00                	add    %al,(%rax)