syzbot

general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
CPU: 0 PID: 372 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:do_rmdir+0x1ee/0x630 fs/namei.c:3913
Code: 72 10 4d 89 fc 48 89 c3 e8 4f 81 ba ff 41 89 df eb 75 48 89 c3 4c 8d 60 30 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 e7 e8 c4 fe f4 ff 49 83 3c 24 00 74 32 e8
RSP: 0018:ffffc90000de7e40 EFLAGS: 00010202
RAX: 0000000000000008 RBX: 0000000000000010 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff8881107c93c0
RBP: ffffc90000de7f18 R08: ffff88810d39627f R09: 1ffff11021a72c4f
R10: dffffc0000000000 R11: ffffed1021a72c50 R12: 0000000000000040
R13: 1ffff11021a72c4a R14: 00000000ffffff9c R15: ffff88810d396250
FS:  00007fe5ee7856c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe5ee763ff8 CR3: 0000000110837000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __do_sys_rmdir fs/namei.c:3938 [inline]
 __se_sys_rmdir fs/namei.c:3936 [inline]
 __x64_sys_rmdir+0x49/0x50 fs/namei.c:3936
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fe5ee920eb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe5ee785028 EFLAGS: 00000246 ORIG_RAX: 0000000000000054
RAX: ffffffffffffffda RBX: 00007fe5eeb9bfa0 RCX: 00007fe5ee920eb9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000040
RBP: 00007fe5ee98ec1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe5eeb9c038 R14: 00007fe5eeb9bfa0 R15: 00007ffed17dca38
Modules linked in:
---[ end trace e9a398d15ff6947c ]---
RIP: 0010:do_rmdir+0x1ee/0x630 fs/namei.c:3913
Code: 72 10 4d 89 fc 48 89 c3 e8 4f 81 ba ff 41 89 df eb 75 48 89 c3 4c 8d 60 30 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 e7 e8 c4 fe f4 ff 49 83 3c 24 00 74 32 e8
RSP: 0018:ffffc90000de7e40 EFLAGS: 00010202
RAX: 0000000000000008 RBX: 0000000000000010 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff8881107c93c0
RBP: ffffc90000de7f18 R08: ffff88810d39627f R09: 1ffff11021a72c4f
R10: dffffc0000000000 R11: ffffed1021a72c50 R12: 0000000000000040
R13: 1ffff11021a72c4a R14: 00000000ffffff9c R15: ffff88810d396250
FS:  00007fe5ee7856c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe5ee763ff8 CR3: 0000000110837000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	72 10                	jb     0x12
   2:	4d 89 fc             	mov    %r15,%r12
   5:	48 89 c3             	mov    %rax,%rbx
   8:	e8 4f 81 ba ff       	call   0xffba815c
   d:	41 89 df             	mov    %ebx,%r15d
  10:	eb 75                	jmp    0x87
  12:	48 89 c3             	mov    %rax,%rbx
  15:	4c 8d 60 30          	lea    0x30(%rax),%r12
  19:	4c 89 e0             	mov    %r12,%rax
  1c:	48 c1 e8 03          	shr    $0x3,%rax
  20:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  27:	fc ff df
* 2a:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	4c 89 e7             	mov    %r12,%rdi
  33:	e8 c4 fe f4 ff       	call   0xfff4fefc
  38:	49 83 3c 24 00       	cmpq   $0x0,(%r12)
  3d:	74 32                	je     0x71
  3f:	e8                   	.byte 0xe8