RBP: 00007f04308251d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffdbad81aef R14: 00007f0430825300 R15: 0000000000022000
 </TASK>
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 0 UID: 0 PID: 13227 Comm: syz-executor.2 Not tainted 6.18.0-rc5-next-20251112 #1 PREEMPT(voluntary) 
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:put_mnt_ns+0x2f/0x180
Code: 54 55 53 48 89 fb e8 f0 49 b1 ff 48 85 db 74 3b e8 e6 49 b1 ff 48 8d 7b 20 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 27 01 00 00 48 8b 6b 20 bf 08 00 00 00 48 89 ee
RSP: 0018:ffff88801bd9f9d8 EFLAGS: 00010213
RAX: dffffc0000000000 RBX: fffffffffffffff4 RCX: ffffc90006821000
RDX: 0000000000000002 RSI: ffffffff81c378ca RDI: 0000000000000014
RBP: ffff888016335618 R08: 0000000000000001 R09: fffffbfff0ba1dde
R10: fffffffffffffff4 R11: 0000000000000001 R12: fffffffffffffff4
R13: 0000000061020100 R14: ffffffff85cfbf20 R15: ffff8880176e3ff8
FS:  00007f0430825700(0000) GS:ffff8880e5397000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0430824f78 CR3: 000000000db5d000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 nsproxy_free+0x36/0x5a0
 create_new_namespaces+0x585/0x750
 copy_namespaces+0x45c/0x580
 copy_process+0x26e4/0x72a0
 kernel_clone+0xea/0x7f0
 __do_sys_clone3+0x1f5/0x280
 do_syscall_64+0xbf/0x430
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f04332afb19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0430825188 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 00007f04333c2f60 RCX: 00007f04332afb19
RDX: 0000000000000000 RSI: 0000000000000058 RDI: 0000000020000240
RBP: 00007f04308251d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffdbad81aef R14: 00007f0430825300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:put_mnt_ns+0x2f/0x180
Code: 54 55 53 48 89 fb e8 f0 49 b1 ff 48 85 db 74 3b e8 e6 49 b1 ff 48 8d 7b 20 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 27 01 00 00 48 8b 6b 20 bf 08 00 00 00 48 89 ee
RSP: 0018:ffff88801bd9f9d8 EFLAGS: 00010213
RAX: dffffc0000000000 RBX: fffffffffffffff4 RCX: ffffc90006821000
RDX: 0000000000000002 RSI: ffffffff81c378ca RDI: 0000000000000014
RBP: ffff888016335618 R08: 0000000000000001 R09: fffffbfff0ba1dde
R10: fffffffffffffff4 R11: 0000000000000001 R12: fffffffffffffff4
R13: 0000000061020100 R14: ffffffff85cfbf20 R15: ffff8880176e3ff8
FS:  00007f0430825700(0000) GS:ffff8880e5397000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0430824f78 CR3: 000000000db5d000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	54                   	push   %rsp
   1:	55                   	push   %rbp
   2:	53                   	push   %rbx
   3:	48 89 fb             	mov    %rdi,%rbx
   6:	e8 f0 49 b1 ff       	callq  0xffb149fb
   b:	48 85 db             	test   %rbx,%rbx
   e:	74 3b                	je     0x4b
  10:	e8 e6 49 b1 ff       	callq  0xffb149fb
  15:	48 8d 7b 20          	lea    0x20(%rbx),%rdi
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 27 01 00 00    	jne    0x15b
  34:	48 8b 6b 20          	mov    0x20(%rbx),%rbp
  38:	bf 08 00 00 00       	mov    $0x8,%edi
  3d:	48 89 ee             	mov    %rbp,%rsi