syzbot

general protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000048-0x000000000000004f]
CPU: 0 PID: 298 Comm: syz-executor285 Not tainted 6.1.129-syzkaller-00014-gbc3d1d352ab6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:vfs_rename+0x1b2/0x10e0 fs/namei.c:4762
Code: c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 66 37 f3 ff 48 8b 03 48 89 44 24 50 48 8b 44 24 38 4c 8d 70 30 4d 89 f5 49 c1 ed 03 <43> 80 7c 3d 00 00 74 08 4c 89 f7 e8 3e 37 f3 ff 49 8b 06 48 89 44
RSP: 0018:ffffc90000f07aa0 EFLAGS: 00010206
RAX: 0000000000000018 RBX: ffff888123527250 RCX: ffff8881201d9440
RDX: ffff8881201d9440 RSI: 0000000000400000 RDI: 0000000000200000
RBP: ffffc90000f07c10 R08: ffffffff81c9afbb R09: fffff520001e0f5d
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888111743300
R13: 0000000000000009 R14: 0000000000000048 R15: dffffc0000000000
FS:  00007efcd10b06c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efcd10b0d58 CR3: 0000000122d89000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_renameat2+0xb28/0x1480 fs/namei.c:5026
 __do_sys_rename fs/namei.c:5072 [inline]
 __se_sys_rename fs/namei.c:5070 [inline]
 __x64_sys_rename+0x86/0x90 fs/namei.c:5070
 x64_sys_call+0x266/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:83
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0x80 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7efcd110f8b9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007efcd10b0218 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007efcd119e418 RCX: 00007efcd110f8b9
RDX: 00007efcd110f8b9 RSI: 00002000000000c0 RDI: 0000200000000100
RBP: 00007efcd119e410 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007efcd116b0b4
R13: 000000000000006e R14: 0000200000000988 R15: 00007fff797767b8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:vfs_rename+0x1b2/0x10e0 fs/namei.c:4762
Code: c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 66 37 f3 ff 48 8b 03 48 89 44 24 50 48 8b 44 24 38 4c 8d 70 30 4d 89 f5 49 c1 ed 03 <43> 80 7c 3d 00 00 74 08 4c 89 f7 e8 3e 37 f3 ff 49 8b 06 48 89 44
RSP: 0018:ffffc90000f07aa0 EFLAGS: 00010206
RAX: 0000000000000018 RBX: ffff888123527250 RCX: ffff8881201d9440
RDX: ffff8881201d9440 RSI: 0000000000400000 RDI: 0000000000200000
RBP: ffffc90000f07c10 R08: ffffffff81c9afbb R09: fffff520001e0f5d
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888111743300
R13: 0000000000000009 R14: 0000000000000048 R15: dffffc0000000000
FS:  00007efcd10b06c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c0a62970b8 CR3: 0000000122d89000 CR4: 00000000003506a0
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 66 37 f3 ff       	call   0xfff33778
  12:	48 8b 03             	mov    (%rbx),%rax
  15:	48 89 44 24 50       	mov    %rax,0x50(%rsp)
  1a:	48 8b 44 24 38       	mov    0x38(%rsp),%rax
  1f:	4c 8d 70 30          	lea    0x30(%rax),%r14
  23:	4d 89 f5             	mov    %r14,%r13
  26:	49 c1 ed 03          	shr    $0x3,%r13
* 2a:	43 80 7c 3d 00 00    	cmpb   $0x0,0x0(%r13,%r15,1) <-- trapping instruction
  30:	74 08                	je     0x3a
  32:	4c 89 f7             	mov    %r14,%rdi
  35:	e8 3e 37 f3 ff       	call   0xfff33778
  3a:	49 8b 06             	mov    (%r14),%rax
  3d:	48                   	rex.W
  3e:	89                   	.byte 0x89
  3f:	44                   	rex.R