loop2: detected capacity change from 0 to 4096
BUG: kernel NULL pointer dereference, address: 0000000000000068
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 8000000173ccb067 P4D 8000000173ccb067 PUD 17553a067 PMD 0 
Oops: Oops: 0000 [#1] PREEMPT SMP PTI
CPU: 1 UID: 0 PID: 5548 Comm: syz.2.16 Not tainted 6.13.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:__d_unalias+0x97/0x170 fs/dcache.c:2970
Code: ff 85 ed 0f 84 ad 00 00 00 e8 65 d5 d2 ff 48 8b 43 50 4c 03 78 68 eb 0b e8 56 d5 d2 ff 45 31 f6 45 31 ff 48 8b 83 98 00 00 00 <4c> 8b 58 68 4d 85 db 74 23 48 89 df 41 ff d3 66 90 84 c0 74 53 e8
RSP: 0018:ffffc90001a6bd18 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8881127d3270 RCX: ffff88810bb13700
RDX: 0000000000000000 RSI: ffff8881127d3270 RDI: ffff88817cfa9af8
RBP: ffff8881127d3398 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88817cfa9af8
R13: ffffc90001a6be68 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f683c8736c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000068 CR3: 000000016805a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 d_splice_alias+0x154/0x210 fs/dcache.c:3038
 nilfs_lookup+0xa4/0xd0 fs/nilfs2/namei.c:72
 lookup_one_qstr_excl+0x8b/0x150 fs/namei.c:1693
 do_renameat2+0x4ad/0x9a0 fs/namei.c:5176
 __do_sys_rename fs/namei.c:5273 [inline]
 __se_sys_rename fs/namei.c:5271 [inline]
 __x64_sys_rename+0x43/0x50 fs/namei.c:5271
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x8d/0x190 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f683b98cda9
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:00007f683c873038 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007f683bba5fa0 RCX: 00007f683b98cda9
RDX: 0000000000000000 RSI: 0000000020000800 RDI: 00000000200001c0
RBP: 00007f683ba0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f683bba5fa0 R15: 00007fff2882e3c8
 </TASK>
Modules linked in:
CR2: 0000000000000068
---[ end trace 0000000000000000 ]---
RIP: 0010:__d_unalias+0x97/0x170 fs/dcache.c:2970
Code: ff 85 ed 0f 84 ad 00 00 00 e8 65 d5 d2 ff 48 8b 43 50 4c 03 78 68 eb 0b e8 56 d5 d2 ff 45 31 f6 45 31 ff 48 8b 83 98 00 00 00 <4c> 8b 58 68 4d 85 db 74 23 48 89 df 41 ff d3 66 90 84 c0 74 53 e8
RSP: 0018:ffffc90001a6bd18 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8881127d3270 RCX: ffff88810bb13700
RDX: 0000000000000000 RSI: ffff8881127d3270 RDI: ffff88817cfa9af8
RBP: ffff8881127d3398 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88817cfa9af8
R13: ffffc90001a6be68 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f683c8736c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000068 CR3: 000000016805a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	ff 85 ed 0f 84 ad    	incl   -0x527bf013(%rbp)
   6:	00 00                	add    %al,(%rax)
   8:	00 e8                	add    %ch,%al
   a:	65 d5                	gs (bad)
   c:	d2 ff                	sar    %cl,%bh
   e:	48 8b 43 50          	mov    0x50(%rbx),%rax
  12:	4c 03 78 68          	add    0x68(%rax),%r15
  16:	eb 0b                	jmp    0x23
  18:	e8 56 d5 d2 ff       	call   0xffd2d573
  1d:	45 31 f6             	xor    %r14d,%r14d
  20:	45 31 ff             	xor    %r15d,%r15d
  23:	48 8b 83 98 00 00 00 	mov    0x98(%rbx),%rax
* 2a:	4c 8b 58 68          	mov    0x68(%rax),%r11 <-- trapping instruction
  2e:	4d 85 db             	test   %r11,%r11
  31:	74 23                	je     0x56
  33:	48 89 df             	mov    %rbx,%rdi
  36:	41 ff d3             	call   *%r11
  39:	66 90                	xchg   %ax,%ax
  3b:	84 c0                	test   %al,%al
  3d:	74 53                	je     0x92
  3f:	e8                   	.byte 0xe8