Oops: general protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000048-0x000000000000004f]
CPU: 0 UID: 0 PID: 10707 Comm: syz.4.12892 Not tainted 6.15.0-rc6-syzkaller-00025-g627277ba7c23 #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 08 26 83 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 84 1a e5 ff 48 8b 1b 31 ff 48 89
RSP: 0018:ffffc9000543fd30 EFLAGS: 00010206
RAX: 0000000000000009 RBX: 0000000000000048 RCX: 0000000000080000
RDX: ffffc9001e8dc000 RSI: 00000000000001cf RDI: 00000000000001d0
RBP: 0000000000000000 R08: ffffffff8dc1683b R09: 1ffffffff1b82d07
R10: dffffc0000000000 R11: fffffbfff1b82d08 R12: ffff88805ffac970
R13: dffffc0000000000 R14: 00000000ffffffea R15: ffff88802cac2e80
FS:  0000000000000000(0000) GS:ffff8881260c7000(0063) knlGS:00000000f50a4b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000000c38199a CR3: 00000000278d6000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __do_sys_move_mount fs/namespace.c:4685 [inline]
 __se_sys_move_mount+0x4aa/0x580 fs/namespace.c:4616
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0xb4/0x110 arch/x86/entry/syscall_32.c:306
 do_fast_syscall_32+0x34/0x80 arch/x86/entry/syscall_32.c:331
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fc2539
Code: 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f50a455c EFLAGS: 00000206 ORIG_RAX: 00000000000001ad
RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 0000000080000140
RDX: 00000000ffffff9c RSI: 0000000080000180 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </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 08 26 83 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 84 1a e5 ff 48 8b 1b 31 ff 48 89
RSP: 0018:ffffc9000543fd30 EFLAGS: 00010206
RAX: 0000000000000009 RBX: 0000000000000048 RCX: 0000000000080000
RDX: ffffc9001e8dc000 RSI: 00000000000001cf RDI: 00000000000001d0
RBP: 0000000000000000 R08: ffffffff8dc1683b R09: 1ffffffff1b82d07
R10: dffffc0000000000 R11: fffffbfff1b82d08 R12: ffff88805ffac970
R13: dffffc0000000000 R14: 00000000ffffffea R15: ffff88802cac2e80
FS:  0000000000000000(0000) GS:ffff8881261c7000(0063) knlGS:00000000f50a4b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000000c41dc01 CR3: 00000000278d6000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	e8 08 26 83 ff       	call   0xff83260d
   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 84 1a e5 ff       	call   0xffe51abd
  39:	48 8b 1b             	mov    (%rbx),%rbx
  3c:	31 ff                	xor    %edi,%edi
  3e:	48                   	rex.W
  3f:	89                   	.byte 0x89