Oops: general protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000048-0x000000000000004f]
CPU: 1 UID: 0 PID: 6576 Comm: syz.2.75 Not tainted 6.15.0-rc6-syzkaller-00052-g9f35e33144ae #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:is_anon_ns fs/mount.h:165 [inline]
RIP: 0010:do_move_mount+0x27d/0xb10 fs/namespace.c:3725
Code: e8 e8 4b 85 ff 41 be ea ff ff ff 49 bd 00 00 00 00 00 fc ff df 48 8b 6c 24 18 4c 8b 7c 24 08 48 8d 5d 48 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 c4 1e e5 ff 48 8b 1b 31 ff 48 89
RSP: 0018:ffffc9000405fd50 EFLAGS: 00010206
RAX: 0000000000000009 RBX: 0000000000000048 RCX: ffff8880269a0000
RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000007
RBP: 0000000000000000 R08: ffffffff8dc1683b R09: 1ffffffff1b82d07
R10: dffffc0000000000 R11: fffffbfff1b82d08 R12: 0000000000000007
R13: dffffc0000000000 R14: 00000000ffffffea R15: ffff8880116c6180
FS:  00007f98977996c0(0000) GS:ffff8881261fb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9897778d58 CR3: 0000000063cf0000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __do_sys_move_mount fs/namespace.c:4678 [inline]
 __se_sys_move_mount+0x41e/0x580 fs/namespace.c:4616
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f989698e969
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:00007f9897799038 EFLAGS: 00000246 ORIG_RAX: 00000000000001ad
RAX: ffffffffffffffda RBX: 00007f9896bb5fa0 RCX: 00007f989698e969
RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f9896a10ab1 R08: 0000000000000046 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9896bb5fa0 R15: 00007ffd484b3028
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:is_anon_ns fs/mount.h:165 [inline]
RIP: 0010:do_move_mount+0x27d/0xb10 fs/namespace.c:3725
Code: e8 e8 4b 85 ff 41 be ea ff ff ff 49 bd 00 00 00 00 00 fc ff df 48 8b 6c 24 18 4c 8b 7c 24 08 48 8d 5d 48 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 c4 1e e5 ff 48 8b 1b 31 ff 48 89
RSP: 0018:ffffc9000405fd50 EFLAGS: 00010206
RAX: 0000000000000009 RBX: 0000000000000048 RCX: ffff8880269a0000
RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000007
RBP: 0000000000000000 R08: ffffffff8dc1683b R09: 1ffffffff1b82d07
R10: dffffc0000000000 R11: fffffbfff1b82d08 R12: 0000000000000007
R13: dffffc0000000000 R14: 00000000ffffffea R15: ffff8880116c6180
FS:  00007f98977996c0(0000) GS:ffff8881260fb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffee0544c10 CR3: 0000000063cf0000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	e8 e8 4b 85 ff       	call   0xff854bed
   5:	41 be ea ff ff ff    	mov    $0xffffffea,%r14d
   b:	49 bd 00 00 00 00 00 	movabs $0xdffffc0000000000,%r13
  12:	fc ff df
  15:	48 8b 6c 24 18       	mov    0x18(%rsp),%rbp
  1a:	4c 8b 7c 24 08       	mov    0x8(%rsp),%r15
  1f:	48 8d 5d 48          	lea    0x48(%rbp),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 c4 1e e5 ff       	call   0xffe51efd
  39:	48 8b 1b             	mov    (%rbx),%rbx
  3c:	31 ff                	xor    %edi,%edi
  3e:	48                   	rex.W
  3f:	89                   	.byte 0x89