Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 UID: 0 PID: 499 Comm: syz.1.55 Not tainted syzkaller #0 5da94d7ae1382d011f9cc741e3f1db1eb2c4dbed
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__d_entry_type include/linux/dcache.h:415 [inline]
RIP: 0010:d_is_miss include/linux/dcache.h:420 [inline]
RIP: 0010:d_is_negative include/linux/dcache.h:466 [inline]
RIP: 0010:d_is_positive include/linux/dcache.h:476 [inline]
RIP: 0010:filename_create+0x245/0x460 fs/namei.c:4033
Code: ff ff 48 3d 01 f0 ff ff 49 89 c7 4c 8b 64 24 28 72 07 e8 4e 74 9b 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 e2 01 00 00 44 8b 20 44 89 e6 81 e6 00 00
RSP: 0018:ffffc9000d51fda0 EFLAGS: 00010247
RAX: 0000000000000004 RBX: 1ffff92001aa3fd5 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffff8881218cf900
RBP: ffffc9000d51fe70 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52001aa3f30 R12: ffffc9000d51fea0
R13: ffffc9000d51fea8 R14: 0000000000000600 R15: 0000000000000004
FS:  00007f4c1f9656c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000006000 CR3: 0000000115f66000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 do_mkdirat+0x56/0x420 fs/namei.c:4272
 __do_sys_mkdirat fs/namei.c:4295 [inline]
 __se_sys_mkdirat fs/namei.c:4293 [inline]
 __x64_sys_mkdirat+0x8b/0xa0 fs/namei.c:4293
 x64_sys_call+0x2ba8/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:259
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f4c1eb8eec9
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:00007f4c1f965038 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f4c1ede6090 RCX: 00007f4c1eb8eec9
RDX: 0000000000000062 RSI: 0000200000000900 RDI: ffffffffffffff9c
RBP: 00007f4c1ec11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4c1ede6128 R14: 00007f4c1ede6090 R15: 00007ffcc96e7698
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__d_entry_type include/linux/dcache.h:415 [inline]
RIP: 0010:d_is_miss include/linux/dcache.h:420 [inline]
RIP: 0010:d_is_negative include/linux/dcache.h:466 [inline]
RIP: 0010:d_is_positive include/linux/dcache.h:476 [inline]
RIP: 0010:filename_create+0x245/0x460 fs/namei.c:4033
Code: ff ff 48 3d 01 f0 ff ff 49 89 c7 4c 8b 64 24 28 72 07 e8 4e 74 9b 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 e2 01 00 00 44 8b 20 44 89 e6 81 e6 00 00
RSP: 0018:ffffc9000d51fda0 EFLAGS: 00010247
RAX: 0000000000000004 RBX: 1ffff92001aa3fd5 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffff8881218cf900
RBP: ffffc9000d51fe70 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52001aa3f30 R12: ffffc9000d51fea0
R13: ffffc9000d51fea8 R14: 0000000000000600 R15: 0000000000000004
FS:  00007f4c1f9656c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f316a3b3ad8 CR3: 0000000115f66000 CR4: 00000000003526b0
----------------
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 4e 74 9b ff       	call   0xff9b7463
  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 e2 01 00 00    	jne    0x216
  34:	44 8b 20             	mov    (%rax),%r12d
  37:	44 89 e6             	mov    %r12d,%esi
  3a:	81                   	.byte 0x81
  3b:	e6 00                	out    %al,$0x0