Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 1 UID: 0 PID: 2895 Comm: syz.3.828 Not tainted syzkaller #0 a14c28d9e62c02dc866229d1d178db2aa7df2752
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:__d_entry_type include/linux/dcache.h:414 [inline]
RIP: 0010:d_is_miss include/linux/dcache.h:419 [inline]
RIP: 0010:d_is_negative include/linux/dcache.h:465 [inline]
RIP: 0010:d_is_positive include/linux/dcache.h:475 [inline]
RIP: 0010:filename_create+0x2b3/0x480 fs/namei.c:4041
Code: 89 de e8 b0 ce 99 ff 85 db 0f 84 8d 00 00 00 e8 63 ca 99 ff 48 8b 5c 24 20 4c 8b 74 24 18 e9 a4 00 00 00 48 89 c1 48 c1 e9 03 <42> 0f b6 0c 21 84 c9 0f 85 93 01 00 00 44 8b 20 44 89 e6 81 e6 00
RSP: 0018:ffffc9000e04fd40 EFLAGS: 00010203
RAX: 000000000000000c RBX: 1ffff92001c09fcd RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff888139c3a080
RBP: ffffc9000e04fe10 R08: ffff8881f6f50bc7 R09: 1ffff1103edea178
R10: dffffc0000000000 R11: ffffed103edea179 R12: dffffc0000000000
R13: ffffc9000e04fe68 R14: 0000000000000600 R15: 000000000000000c
FS:  00007f74bd5d66c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000004fe0 CR3: 000000010f3d6000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 do_mkdirat+0xa9/0x530 fs/namei.c:4280
 __do_sys_mkdirat fs/namei.c:4303 [inline]
 __se_sys_mkdirat fs/namei.c:4301 [inline]
 __x64_sys_mkdirat+0x8b/0xa0 fs/namei.c:4301
 x64_sys_call+0x2ba8/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:259
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f74beb9bf79
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f74bd5d6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f74bee16090 RCX: 00007f74beb9bf79
RDX: 0000000000000062 RSI: 0000200000000900 RDI: ffffffffffffff9c
RBP: 00007f74bec327e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f74bee16128 R14: 00007f74bee16090 R15: 00007ffd43170128
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__d_entry_type include/linux/dcache.h:414 [inline]
RIP: 0010:d_is_miss include/linux/dcache.h:419 [inline]
RIP: 0010:d_is_negative include/linux/dcache.h:465 [inline]
RIP: 0010:d_is_positive include/linux/dcache.h:475 [inline]
RIP: 0010:filename_create+0x2b3/0x480 fs/namei.c:4041
Code: 89 de e8 b0 ce 99 ff 85 db 0f 84 8d 00 00 00 e8 63 ca 99 ff 48 8b 5c 24 20 4c 8b 74 24 18 e9 a4 00 00 00 48 89 c1 48 c1 e9 03 <42> 0f b6 0c 21 84 c9 0f 85 93 01 00 00 44 8b 20 44 89 e6 81 e6 00
RSP: 0018:ffffc9000e04fd40 EFLAGS: 00010203
RAX: 000000000000000c RBX: 1ffff92001c09fcd RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff888139c3a080
RBP: ffffc9000e04fe10 R08: ffff8881f6f50bc7 R09: 1ffff1103edea178
R10: dffffc0000000000 R11: ffffed103edea179 R12: dffffc0000000000
R13: ffffc9000e04fe68 R14: 0000000000000600 R15: 000000000000000c
FS:  00007f74bd5d66c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc7e4fb0ff8 CR3: 000000010f3d6000 CR4: 00000000003526b0
----------------
Code disassembly (best guess):
   0:	89 de                	mov    %ebx,%esi
   2:	e8 b0 ce 99 ff       	call   0xff99ceb7
   7:	85 db                	test   %ebx,%ebx
   9:	0f 84 8d 00 00 00    	je     0x9c
   f:	e8 63 ca 99 ff       	call   0xff99ca77
  14:	48 8b 5c 24 20       	mov    0x20(%rsp),%rbx
  19:	4c 8b 74 24 18       	mov    0x18(%rsp),%r14
  1e:	e9 a4 00 00 00       	jmp    0xc7
  23:	48 89 c1             	mov    %rax,%rcx
  26:	48 c1 e9 03          	shr    $0x3,%rcx
* 2a:	42 0f b6 0c 21       	movzbl (%rcx,%r12,1),%ecx <-- trapping instruction
  2f:	84 c9                	test   %cl,%cl
  31:	0f 85 93 01 00 00    	jne    0x1ca
  37:	44 8b 20             	mov    (%rax),%r12d
  3a:	44 89 e6             	mov    %r12d,%esi
  3d:	81                   	.byte 0x81
  3e:	e6 00                	out    %al,$0x0