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: 374 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:vfs_rename+0x1b1/0x10d0 fs/namei.c:4729
Code: c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 97 11 f5 ff 48 8b 03 48 89 44 24 48 48 8b 44 24 30 4c 8d 70 30 4d 89 f7 49 c1 ef 03 <43> 80 3c 27 00 74 08 4c 89 f7 e8 70 11 f5 ff 49 8b 16 4c 89 6c 24
RSP: 0018:ffffc900040afb80 EFLAGS: 00010206
RAX: 0000000000000018 RBX: ffff88810cc459c0 RCX: ffff8881101862c0
RDX: 0000000000000000 RSI: 0000000000400000 RDI: 0000000000200000
RBP: ffffc900040afcf0 R08: dffffc0000000000 R09: ffffed10219858b6
R10: ffffed10219858b6 R11: 1ffff110219858b5 R12: dffffc0000000000
R13: ffff888123393600 R14: 0000000000000048 R15: 0000000000000009
FS:  00007f299375c6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000b000 CR3: 000000012cb98000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_renameat2+0x7ed/0xf60 fs/namei.c:4993
 __do_sys_rename fs/namei.c:5039 [inline]
 __se_sys_rename fs/namei.c:5037 [inline]
 __x64_sys_rename+0x86/0x90 fs/namei.c:5037
 x64_sys_call+0x680/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:83
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f299390cfc9
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:00007f299375c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007f2993b64090 RCX: 00007f299390cfc9
RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 0000200000000100
RBP: 00007f299398ff91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2993b64128 R14: 00007f2993b64090 R15: 00007ffe27804fd8
 </TASK>
Modules linked in:
---[ end trace dd5d794f8da4b07b ]---
RIP: 0010:vfs_rename+0x1b1/0x10d0 fs/namei.c:4729
Code: c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 97 11 f5 ff 48 8b 03 48 89 44 24 48 48 8b 44 24 30 4c 8d 70 30 4d 89 f7 49 c1 ef 03 <43> 80 3c 27 00 74 08 4c 89 f7 e8 70 11 f5 ff 49 8b 16 4c 89 6c 24
RSP: 0018:ffffc900040afb80 EFLAGS: 00010206
RAX: 0000000000000018 RBX: ffff88810cc459c0 RCX: ffff8881101862c0
RDX: 0000000000000000 RSI: 0000000000400000 RDI: 0000000000200000
RBP: ffffc900040afcf0 R08: dffffc0000000000 R09: ffffed10219858b6
R10: ffffed10219858b6 R11: 1ffff110219858b5 R12: dffffc0000000000
R13: ffff888123393600 R14: 0000000000000048 R15: 0000000000000009
FS:  00007f299375c6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f299375bf98 CR3: 000000012cb98000 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 20 00       	cmpb   $0x0,(%rax,%r12,1)
   8:	74 08                	je     0x12
   a:	48 89 df             	mov    %rbx,%rdi
   d:	e8 97 11 f5 ff       	call   0xfff511a9
  12:	48 8b 03             	mov    (%rbx),%rax
  15:	48 89 44 24 48       	mov    %rax,0x48(%rsp)
  1a:	48 8b 44 24 30       	mov    0x30(%rsp),%rax
  1f:	4c 8d 70 30          	lea    0x30(%rax),%r14
  23:	4d 89 f7             	mov    %r14,%r15
  26:	49 c1 ef 03          	shr    $0x3,%r15
* 2a:	43 80 3c 27 00       	cmpb   $0x0,(%r15,%r12,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 f7             	mov    %r14,%rdi
  34:	e8 70 11 f5 ff       	call   0xfff511a9
  39:	49 8b 16             	mov    (%r14),%rdx
  3c:	4c                   	rex.WR
  3d:	89                   	.byte 0x89
  3e:	6c                   	insb   (%dx),%es:(%rdi)
  3f:	24                   	.byte 0x24