syzbot

general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 0 PID: 377 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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:d_is_positive include/linux/dcache.h:455 [inline]
RIP: 0010:filename_create+0x241/0x450 fs/namei.c:3882
Code: ff ff 48 3d 01 f0 ff ff 49 89 c7 4c 8b 64 24 28 72 07 e8 42 c7 af 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:ffffc90000987d60 EFLAGS: 00010203
RAX: 0000000000000017 RBX: 1ffff92000130fd3 RCX: 0000000000000002
RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffff888113682880
RBP: ffffc90000987e30 R08: dffffc0000000000 R09: fffff52000130f89
R10: fffff52000130f89 R11: 1ffff92000130f88 R12: ffffc90000987e90
R13: ffffc90000987e98 R14: 0000000000000600 R15: 0000000000000017
FS:  00007f114faae6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000afe0 CR3: 000000012e301000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_mknodat+0xd7/0x7a0 fs/namei.c:4021
 __do_sys_mknod fs/namei.c:4067 [inline]
 __se_sys_mknod fs/namei.c:4065 [inline]
 __x64_sys_mknod+0x8e/0xa0 fs/namei.c:4065
 x64_sys_call+0x7d7/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:134
 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: 0033:0x7f114eb8f6c9
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:00007f114faae038 EFLAGS: 00000246 ORIG_RAX: 0000000000000085
RAX: ffffffffffffffda RBX: 00007f114ede5fa0 RCX: 00007f114eb8f6c9
RDX: 0000000000000704 RSI: 00000000ffffc000 RDI: 00002000000002c0
RBP: 00007f114ec11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f114ede6038 R14: 00007f114ede5fa0 R15: 00007ffd1dac7228
 </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:d_is_positive include/linux/dcache.h:455 [inline]
RIP: 0010:filename_create+0x241/0x450 fs/namei.c:3882
Code: ff ff 48 3d 01 f0 ff ff 49 89 c7 4c 8b 64 24 28 72 07 e8 42 c7 af 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:ffffc90000987d60 EFLAGS: 00010203
RAX: 0000000000000017 RBX: 1ffff92000130fd3 RCX: 0000000000000002
RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffff888113682880
RBP: ffffc90000987e30 R08: dffffc0000000000 R09: fffff52000130f89
R10: fffff52000130f89 R11: 1ffff92000130f88 R12: ffffc90000987e90
R13: ffffc90000987e98 R14: 0000000000000600 R15: 0000000000000017
FS:  00007f114faae6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f114fa8cf98 CR3: 000000012e301000 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 42 c7 af ff       	call   0xffafc757
  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