syzbot

general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 293 Comm: syz-executor246 Not tainted 6.1.141-syzkaller-00038-ge2deb0b42a3a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__d_entry_type include/linux/dcache.h:394 [inline]
RIP: 0010:d_is_miss include/linux/dcache.h:399 [inline]
RIP: 0010:d_is_negative include/linux/dcache.h:445 [inline]
RIP: 0010:do_renameat2+0x49f/0xf60 fs/namei.c:4974
Code: ff 48 89 c2 48 3d 01 f0 ff ff 72 0d 49 89 d5 e8 07 66 af ff e9 36 04 00 00 49 89 d4 49 c1 ec 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 04 04 84 c0 48 89 54 24 10 0f 85 e7 05 00 00 8b 1a be 00
RSP: 0018:ffffc90000e57d00 EFLAGS: 00010247
RAX: dffffc0000000000 RBX: ffff88810ee1b300 RCX: ffff88810e10e540
RDX: 0000000000000005 RSI: 0000000000000004 RDI: ffff88810e10e540
RBP: ffffc90000e57ed8 R08: dffffc0000000000 R09: fffff520001caf7d
R10: fffff520001caf7d R11: 1ffff920001caf7c R12: 0000000000000000
R13: 0000000000000000 R14: ffffc90000e57e01 R15: ffff888124887110
FS:  00007fd7c38166c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000026f72d8 CR3: 0000000121d99000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __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+0x300/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:83
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd7c38756f9
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:00007fd7c3816218 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007fd7c39023f8 RCX: 00007fd7c38756f9
RDX: 00007fd7c38756f9 RSI: 0000200000000140 RDI: 0000200000000100
RBP: 00007fd7c39023f0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd7c38cf02c
R13: 000020000000c280 R14: 0000200000000100 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__d_entry_type include/linux/dcache.h:394 [inline]
RIP: 0010:d_is_miss include/linux/dcache.h:399 [inline]
RIP: 0010:d_is_negative include/linux/dcache.h:445 [inline]
RIP: 0010:do_renameat2+0x49f/0xf60 fs/namei.c:4974
Code: ff 48 89 c2 48 3d 01 f0 ff ff 72 0d 49 89 d5 e8 07 66 af ff e9 36 04 00 00 49 89 d4 49 c1 ec 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 04 04 84 c0 48 89 54 24 10 0f 85 e7 05 00 00 8b 1a be 00
RSP: 0018:ffffc90000e57d00 EFLAGS: 00010247
RAX: dffffc0000000000 RBX: ffff88810ee1b300 RCX: ffff88810e10e540
RDX: 0000000000000005 RSI: 0000000000000004 RDI: ffff88810e10e540
RBP: ffffc90000e57ed8 R08: dffffc0000000000 R09: fffff520001caf7d
R10: fffff520001caf7d R11: 1ffff920001caf7c R12: 0000000000000000
R13: 0000000000000000 R14: ffffc90000e57e01 R15: ffff888124887110
FS:  00007fd7c38166c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000026f72d8 CR3: 0000000121d99000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	48 89 c2             	mov    %rax,%rdx
   3:	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax
   9:	72 0d                	jb     0x18
   b:	49 89 d5             	mov    %rdx,%r13
   e:	e8 07 66 af ff       	call   0xffaf661a
  13:	e9 36 04 00 00       	jmp    0x44e
  18:	49 89 d4             	mov    %rdx,%r12
  1b:	49 c1 ec 03          	shr    $0x3,%r12
  1f:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  26:	fc ff df
* 29:	41 0f b6 04 04       	movzbl (%r12,%rax,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	48 89 54 24 10       	mov    %rdx,0x10(%rsp)
  35:	0f 85 e7 05 00 00    	jne    0x622
  3b:	8b 1a                	mov    (%rdx),%ebx
  3d:	be                   	.byte 0xbe