syzbot

general protection fault, probably for non-canonical address 0xdffffc0000000007: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]
CPU: 0 PID: 366 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:vfs_rename+0x1b0/0x10f0 fs/namei.c:4729
Code: 30 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 f3 ea f4 ff 48 8b 1b 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 d1 ea f4 ff 48 89 5c 24 50 4c 89
RSP: 0018:ffffc900027c7b60 EFLAGS: 00010203
RAX: 000000000000000f RBX: ffff888120730d80 RCX: ffff888110a4a780
RDX: 0000000000000000 RSI: 0000000000600000 RDI: 0000000000200000
RBP: ffffc900027c7cd0 R08: ffff88810d19816f R09: 1ffff11021a3302d
R10: dffffc0000000000 R11: ffffed1021a3302e R12: dffffc0000000000
R13: ffff888120731b00 R14: 000000000000003f R15: 0000000000000007
FS:  00007f0c96da86c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0c96da7ff8 CR3: 000000012e1e0000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_renameat2+0x826/0xfd0 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: 0033:0x7f0c96f87799
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:00007f0c96da8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007f0c97201180 RCX: 00007f0c96f87799
RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 0000200000000280
RBP: 00007f0c9701dc99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0c97201218 R14: 00007f0c97201180 R15: 00007ffd08fb1fc8
 </TASK>
Modules linked in:
---[ end trace 564558e6aacf8ca1 ]---
RIP: 0010:vfs_rename+0x1b0/0x10f0 fs/namei.c:4729
Code: 30 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 f3 ea f4 ff 48 8b 1b 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 d1 ea f4 ff 48 89 5c 24 50 4c 89
RSP: 0018:ffffc900027c7b60 EFLAGS: 00010203
RAX: 000000000000000f RBX: ffff888120730d80 RCX: ffff888110a4a780
RDX: 0000000000000000 RSI: 0000000000600000 RDI: 0000000000200000
RBP: ffffc900027c7cd0 R08: ffff88810d19816f R09: 1ffff11021a3302d
R10: dffffc0000000000 R11: ffffed1021a3302e R12: dffffc0000000000
R13: ffff888120731b00 R14: 000000000000003f R15: 0000000000000007
FS:  00007f0c96da86c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0c96da7ff8 CR3: 000000012e1e0000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	30 48 89             	xor    %cl,-0x77(%rax)
   3:	d8 48 c1             	fmuls  -0x3f(%rax)
   6:	e8 03 42 80 3c       	call   0x3c80420e
   b:	20 00                	and    %al,(%rax)
   d:	74 08                	je     0x17
   f:	48 89 df             	mov    %rbx,%rdi
  12:	e8 f3 ea f4 ff       	call   0xfff4eb0a
  17:	48 8b 1b             	mov    (%rbx),%rbx
  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 d1 ea f4 ff       	call   0xfff4eb0a
  39:	48 89 5c 24 50       	mov    %rbx,0x50(%rsp)
  3e:	4c                   	rex.WR
  3f:	89                   	.byte 0x89