syzbot

general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 PID: 292 Comm: syz-executor183 Not tainted 6.1.141-syzkaller-00042-g96160a0e0aa1 #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: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 a2 e2 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:ffffc90000e87da0 EFLAGS: 00010202
RAX: 000000000000000b RBX: 1ffff920001d0fd4 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: 0000000000000005 RDI: ffff888115bc0000
RBP: ffffc90000e87e68 R08: dffffc0000000000 R09: fffff520001d0f91
R10: fffff520001d0f91 R11: 1ffff920001d0f90 R12: ffffc90000e87e98
R13: ffffc90000e87ea0 R14: 0000000000000600 R15: 000000000000000b
FS:  00007f9fafc2f6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9fafccc610 CR3: 00000001256fb000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_mkdirat+0x5c/0x4c0 fs/namei.c:4120
 __do_sys_mkdir fs/namei.c:4150 [inline]
 __se_sys_mkdir fs/namei.c:4148 [inline]
 __x64_sys_mkdir+0x6e/0x80 fs/namei.c:4148
 x64_sys_call+0x966/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:84
 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: 0033:0x7f9fafc91819
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 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:00007f9fafc2f218 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007f9fafd213d8 RCX: 00007f9fafc91819
RDX: 00007f9fafc91819 RSI: 000000000000000a RDI: 0000200000000080
RBP: 00007f9fafd213d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9fafcee124
R13: 0000000000000008 R14: 0030656c69662f2e R15: 0000200000000080
 </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 a2 e2 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:ffffc90000e87da0 EFLAGS: 00010202
RAX: 000000000000000b RBX: 1ffff920001d0fd4 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: 0000000000000005 RDI: ffff888115bc0000
RBP: ffffc90000e87e68 R08: dffffc0000000000 R09: fffff520001d0f91
R10: fffff520001d0f91 R11: 1ffff920001d0f90 R12: ffffc90000e87e98
R13: ffffc90000e87ea0 R14: 0000000000000600 R15: 000000000000000b
FS:  00007f9fafc2f6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055bb0cd79eb8 CR3: 00000001256fb000 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 a2 e2 af ff       	call   0xffafe2b7
  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