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: 376 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__d_entry_type include/linux/dcache.h:404 [inline]
RIP: 0010:d_is_miss include/linux/dcache.h:409 [inline]
RIP: 0010:d_is_negative include/linux/dcache.h:455 [inline]
RIP: 0010:d_is_positive include/linux/dcache.h:465 [inline]
RIP: 0010:filename_create+0x241/0x450 fs/namei.c:3842
Code: ff ff 48 3d 01 f0 ff ff 49 89 c7 4c 8b 64 24 28 72 07 e8 32 f4 b6 ff eb 6d 48 89 c1 48 c1 e9 03 48 ba 00 00 00 00 00 fc ff df <0f> b6 0c 11 84 c9 0f 85 dd 01 00 00 44 8b 20 44 89 e6 81 e6 00 00
RSP: 0018:ffffc900040a7d60 EFLAGS: 00010246
RAX: 0000000000000002 RBX: 1ffff92000814fd2 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffff888110043b40
RBP: ffffc900040a7e40 R08: dffffc0000000000 R09: ffffed10219ba782
R10: ffffed10219ba782 R11: 1ffff110219ba781 R12: ffffc900040a7e88
R13: ffffc900040a7e90 R14: 0000000000000600 R15: 0000000000000002
FS:  00007f8d453f76c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8d453f6f98 CR3: 000000012d342000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_linkat+0x137/0x730 fs/namei.c:4612
 __do_sys_link fs/namei.c:4662 [inline]
 __se_sys_link fs/namei.c:4660 [inline]
 __x64_sys_link+0x86/0x90 fs/namei.c:4660
 x64_sys_call+0x34d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:87
 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: 0033:0x7f8d455c8ec9
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:00007f8d453f7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000056
RAX: ffffffffffffffda RBX: 00007f8d45820180 RCX: 00007f8d455c8ec9
RDX: 0000000000000000 RSI: 0000200000000400 RDI: 0000200000000280
RBP: 00007f8d4564bf91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8d45820218 R14: 00007f8d45820180 R15: 00007fff2b1e6d88
 </TASK>
Modules linked in:
---[ end trace 9ef8b9f6e3903b05 ]---
RIP: 0010:__d_entry_type include/linux/dcache.h:404 [inline]
RIP: 0010:d_is_miss include/linux/dcache.h:409 [inline]
RIP: 0010:d_is_negative include/linux/dcache.h:455 [inline]
RIP: 0010:d_is_positive include/linux/dcache.h:465 [inline]
RIP: 0010:filename_create+0x241/0x450 fs/namei.c:3842
Code: ff ff 48 3d 01 f0 ff ff 49 89 c7 4c 8b 64 24 28 72 07 e8 32 f4 b6 ff eb 6d 48 89 c1 48 c1 e9 03 48 ba 00 00 00 00 00 fc ff df <0f> b6 0c 11 84 c9 0f 85 dd 01 00 00 44 8b 20 44 89 e6 81 e6 00 00
RSP: 0018:ffffc900040a7d60 EFLAGS: 00010246
RAX: 0000000000000002 RBX: 1ffff92000814fd2 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffff888110043b40
RBP: ffffc900040a7e40 R08: dffffc0000000000 R09: ffffed10219ba782
R10: ffffed10219ba782 R11: 1ffff110219ba781 R12: ffffc900040a7e88
R13: ffffc900040a7e90 R14: 0000000000000600 R15: 0000000000000002
FS:  00007f8d453f76c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8d453f6f98 CR3: 000000012d342000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax
   6:	49 89 c7             	mov    %rax,%r15
   9:	4c 8b 64 24 28       	mov    0x28(%rsp),%r12
   e:	72 07                	jb     0x17
  10:	e8 32 f4 b6 ff       	call   0xffb6f447
  15:	eb 6d                	jmp    0x84
  17:	48 89 c1             	mov    %rax,%rcx
  1a:	48 c1 e9 03          	shr    $0x3,%rcx
  1e:	48 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%rdx
  25:	fc ff df
* 28:	0f b6 0c 11          	movzbl (%rcx,%rdx,1),%ecx <-- trapping instruction
  2c:	84 c9                	test   %cl,%cl
  2e:	0f 85 dd 01 00 00    	jne    0x211
  34:	44 8b 20             	mov    (%rax),%r12d
  37:	44 89 e6             	mov    %r12d,%esi
  3a:	81                   	.byte 0x81
  3b:	e6 00                	out    %al,$0x0