syzbot

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 0 UID: 0 PID: 6270 Comm: syz.4.120 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:is_ns_init_id include/linux/ns_common.h:25 [inline]
RIP: 0010:__ns_ref_put include/linux/ns_common.h:70 [inline]
RIP: 0010:put_mnt_ns+0x34/0x2f0 fs/namespace.c:6062
Code: 55 41 54 53 48 89 fb e8 ca e7 7d ff 48 85 db 0f 84 df 00 00 00 49 bc 00 00 00 00 00 fc ff df 4c 8d 73 20 4d 89 f5 49 c1 ed 03 <43> 80 7c 25 00 00 74 08 4c 89 f7 e8 8c 95 e4 ff 4d 8b 3e 31 ff 4c
RSP: 0018:ffffc900052b7960 EFLAGS: 00010203
RAX: ffffffff8243b886 RBX: fffffffffffffff4 RCX: 0000000000080000
RDX: ffffc9000cc0b000 RSI: 000000000004128d RDI: 000000000004128e
RBP: fffffffffffffff4 R08: ffffffff8f7dd077 R09: 1ffffffff1efba0e
R10: dffffc0000000000 R11: fffffbfff1efba0f R12: dffffc0000000000
R13: 0000000000000002 R14: 0000000000000014 R15: ffff88802ad90958
FS:  00007f69aaa526c0(0000) GS:ffff888125ec1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000380 CR3: 0000000035054000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 nsproxy_free+0x3c/0x7c0 kernel/nsproxy.c:65
 __free_nsproxy_free kernel/nsproxy.c:76 [inline]
 create_new_namespaces+0x47a/0x540 kernel/nsproxy.c:132
 copy_namespaces+0x438/0x4b0 kernel/nsproxy.c:166
 copy_process+0x168f/0x3930 kernel/fork.c:2183
 kernel_clone+0x21e/0x850 kernel/fork.c:2609
 __do_sys_clone kernel/fork.c:2750 [inline]
 __se_sys_clone kernel/fork.c:2734 [inline]
 __x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2734
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f69a9b8f6c9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f69aaa51fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f69a9de5fa0 RCX: 00007f69a9b8f6c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000b21e0000
RBP: 00007f69a9c11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f69a9de6038 R14: 00007f69a9de5fa0 R15: 00007ffee58cd938
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:is_ns_init_id include/linux/ns_common.h:25 [inline]
RIP: 0010:__ns_ref_put include/linux/ns_common.h:70 [inline]
RIP: 0010:put_mnt_ns+0x34/0x2f0 fs/namespace.c:6062
Code: 55 41 54 53 48 89 fb e8 ca e7 7d ff 48 85 db 0f 84 df 00 00 00 49 bc 00 00 00 00 00 fc ff df 4c 8d 73 20 4d 89 f5 49 c1 ed 03 <43> 80 7c 25 00 00 74 08 4c 89 f7 e8 8c 95 e4 ff 4d 8b 3e 31 ff 4c
RSP: 0018:ffffc900052b7960 EFLAGS: 00010203
RAX: ffffffff8243b886 RBX: fffffffffffffff4 RCX: 0000000000080000
RDX: ffffc9000cc0b000 RSI: 000000000004128d RDI: 000000000004128e
RBP: fffffffffffffff4 R08: ffffffff8f7dd077 R09: 1ffffffff1efba0e
R10: dffffc0000000000 R11: fffffbfff1efba0f R12: dffffc0000000000
R13: 0000000000000002 R14: 0000000000000014 R15: ffff88802ad90958
FS:  00007f69aaa526c0(0000) GS:ffff888125ec1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30721ff8 CR3: 0000000035054000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	55                   	push   %rbp
   1:	41 54                	push   %r12
   3:	53                   	push   %rbx
   4:	48 89 fb             	mov    %rdi,%rbx
   7:	e8 ca e7 7d ff       	call   0xff7de7d6
   c:	48 85 db             	test   %rbx,%rbx
   f:	0f 84 df 00 00 00    	je     0xf4
  15:	49 bc 00 00 00 00 00 	movabs $0xdffffc0000000000,%r12
  1c:	fc ff df
  1f:	4c 8d 73 20          	lea    0x20(%rbx),%r14
  23:	4d 89 f5             	mov    %r14,%r13
  26:	49 c1 ed 03          	shr    $0x3,%r13
* 2a:	43 80 7c 25 00 00    	cmpb   $0x0,0x0(%r13,%r12,1) <-- trapping instruction
  30:	74 08                	je     0x3a
  32:	4c 89 f7             	mov    %r14,%rdi
  35:	e8 8c 95 e4 ff       	call   0xffe495c6
  3a:	4d 8b 3e             	mov    (%r14),%r15
  3d:	31 ff                	xor    %edi,%edi
  3f:	4c                   	rex.WR