RBP: 00007fdc3c6a11d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffd41ed77df R14: 00007fdc3c6a1300 R15: 0000000000022000
 </TASK>
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000035: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x00000000000001a8-0x00000000000001af]
CPU: 0 UID: 0 PID: 23520 Comm: syz-executor.4 Not tainted 6.18.0-rc5-next-20251113 #1 PREEMPT(voluntary) 
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:nsproxy_free+0x7c/0x5a0
Code: 04 00 00 4c 8b 65 08 4d 85 e4 74 47 e8 5d 49 30 00 49 8d bc 24 b8 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 fb 04 00 00 49 8b 9c 24 b8 01 00 00 bf 08 00 00
RSP: 0018:ffff888057f2f9f8 EFLAGS: 00010217
RAX: dffffc0000000000 RBX: ffff888057c28000 RCX: ffffc90002c23000
RDX: 0000000000000035 RSI: ffffffff8144c953 RDI: 00000000000001ac
RBP: ffff8880566199c0 R08: 0000000000000001 R09: ffffed1001e94383
R10: 000000000000001b R11: 0000000000000001 R12: fffffffffffffff4
R13: 000000007f904900 R14: ffff8880540270c0 R15: ffff888057c28878
FS:  00007fdc3c6a1700(0000) GS:ffff8880e5394000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdc3c6a0f78 CR3: 0000000057856000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 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: 0033:0x7fdc3f12bb19
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:00007fdc3c6a1188 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 00007fdc3f23ef60 RCX: 00007fdc3f12bb19
RDX: 0000000000000000 RSI: 0000000000000058 RDI: 0000000020005880
RBP: 00007fdc3c6a11d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffd41ed77df R14: 00007fdc3c6a1300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:nsproxy_free+0x7c/0x5a0
Code: 04 00 00 4c 8b 65 08 4d 85 e4 74 47 e8 5d 49 30 00 49 8d bc 24 b8 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 fb 04 00 00 49 8b 9c 24 b8 01 00 00 bf 08 00 00
RSP: 0018:ffff888057f2f9f8 EFLAGS: 00010217
RAX: dffffc0000000000 RBX: ffff888057c28000 RCX: ffffc90002c23000
RDX: 0000000000000035 RSI: ffffffff8144c953 RDI: 00000000000001ac
RBP: ffff8880566199c0 R08: 0000000000000001 R09: ffffed1001e94383
R10: 000000000000001b R11: 0000000000000001 R12: fffffffffffffff4
R13: 000000007f904900 R14: ffff8880540270c0 R15: ffff888057c28878
FS:  00007fdc3c6a1700(0000) GS:ffff8880e5394000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdc3c6a0f78 CR3: 0000000057856000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	04 00                	add    $0x0,%al
   2:	00 4c 8b 65          	add    %cl,0x65(%rbx,%rcx,4)
   6:	08 4d 85             	or     %cl,-0x7b(%rbp)
   9:	e4 74                	in     $0x74,%al
   b:	47 e8 5d 49 30 00    	rex.RXB callq 0x30496e
  11:	49 8d bc 24 b8 01 00 	lea    0x1b8(%r12),%rdi
  18:	00
  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 fb 04 00 00    	jne    0x52f
  34:	49 8b 9c 24 b8 01 00 	mov    0x1b8(%r12),%rbx
  3b:	00
  3c:	bf                   	.byte 0xbf
  3d:	08 00                	or     %al,(%rax)