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: 378 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:vfs_rename+0x10a/0xf50 fs/namei.c:4379
Code: c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 5e d5 f4 ff 48 8b 03 48 89 44 24 48 4c 89 74 24 58 4d 8d 6e 30 4c 89 eb 48 c1 eb 03 <42> 80 3c 3b 00 74 08 4c 89 ef e8 37 d5 f4 ff 49 8b 4d 00 4c 89 64
RSP: 0018:ffffc90002ea7c40 EFLAGS: 00010202
RAX: ffff888120e02400 RBX: 0000000000000008 RCX: 0000000000000000
RDX: ffff888111140000 RSI: 0000000000400000 RDI: 0000000000200000
RBP: ffffc90002ea7d90 R08: ffffc90002ea7e30 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1021265f82 R12: ffff888120e00d80
R13: 0000000000000040 R14: 0000000000000010 R15: dffffc0000000000
FS:  00007fcc94fc86c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcc94fc8d58 CR3: 000000010fe1b000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 do_renameat2+0x6f4/0xe50 fs/namei.c:4627
 __do_sys_rename fs/namei.c:4678 [inline]
 __se_sys_rename fs/namei.c:4676 [inline]
 __x64_sys_rename+0x86/0x90 fs/namei.c:4676
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fcc951a6f79
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:00007fcc94fc8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007fcc95421180 RCX: 00007fcc951a6f79
RDX: 0000000000000000 RSI: 0000200000000140 RDI: 0000200000000100
RBP: 00007fcc9523d7e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcc95421218 R14: 00007fcc95421180 R15: 00007fffe30b6968
Modules linked in:
---[ end trace f806d1a623b40bc7 ]---
RIP: 0010:vfs_rename+0x10a/0xf50 fs/namei.c:4379
Code: c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 5e d5 f4 ff 48 8b 03 48 89 44 24 48 4c 89 74 24 58 4d 8d 6e 30 4c 89 eb 48 c1 eb 03 <42> 80 3c 3b 00 74 08 4c 89 ef e8 37 d5 f4 ff 49 8b 4d 00 4c 89 64
RSP: 0018:ffffc90002ea7c40 EFLAGS: 00010202
RAX: ffff888120e02400 RBX: 0000000000000008 RCX: 0000000000000000
RDX: ffff888111140000 RSI: 0000000000400000 RDI: 0000000000200000
RBP: ffffc90002ea7d90 R08: ffffc90002ea7e30 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1021265f82 R12: ffff888120e00d80
R13: 0000000000000040 R14: 0000000000000010 R15: dffffc0000000000
FS:  00007fcc94fc86c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcc94fc8d58 CR3: 000000010fe1b000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	c1 e8 03             	shr    $0x3,%eax
   3:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1)
   8:	74 08                	je     0x12
   a:	48 89 df             	mov    %rbx,%rdi
   d:	e8 5e d5 f4 ff       	call   0xfff4d570
  12:	48 8b 03             	mov    (%rbx),%rax
  15:	48 89 44 24 48       	mov    %rax,0x48(%rsp)
  1a:	4c 89 74 24 58       	mov    %r14,0x58(%rsp)
  1f:	4d 8d 6e 30          	lea    0x30(%r14),%r13
  23:	4c 89 eb             	mov    %r13,%rbx
  26:	48 c1 eb 03          	shr    $0x3,%rbx
* 2a:	42 80 3c 3b 00       	cmpb   $0x0,(%rbx,%r15,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 ef             	mov    %r13,%rdi
  34:	e8 37 d5 f4 ff       	call   0xfff4d570
  39:	49 8b 4d 00          	mov    0x0(%r13),%rcx
  3d:	4c                   	rex.WR
  3e:	89                   	.byte 0x89
  3f:	64                   	fs