syzbot

general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 0 PID: 296 Comm: syz-executor162 Not tainted 5.15.167-syzkaller-00348-g2e66050fb753 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
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+0x2d8/0x530 fs/namei.c:3842
Code: 92 00 00 00 4c 89 7c 24 28 45 84 e4 0f 95 c0 83 7c 24 14 00 0f 94 c3 20 c3 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 1f 02 00 00 45 8b 26 41 bd 00 00 70 00 be
RSP: 0018:ffffc90000997cc0 EFLAGS: 00010206
RAX: 0000000000000003 RBX: 1ffff92000132f00 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000000
RBP: ffffc90000997db0 R08: ffffffff81c0d6a8 R09: ffffed10243bb2fa
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: 0000000000000600 R14: 0000000000000018 R15: ffffc90000997e60
FS:  00007fefec8456c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000a000 CR3: 000000011c2e5000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_mknodat+0x1a4/0x5c0 fs/namei.c:3981
 __do_sys_mknod fs/namei.c:4027 [inline]
 __se_sys_mknod fs/namei.c:4025 [inline]
 __x64_sys_mknod+0x8e/0xa0 fs/namei.c:4025
 x64_sys_call+0x3cb/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:134
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fefec887869
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:00007fefec845218 EFLAGS: 00000246 ORIG_RAX: 0000000000000085
RAX: ffffffffffffffda RBX: 00007fefec9116c8 RCX: 00007fefec887869
RDX: 0000000000000700 RSI: 0000000000000000 RDI: 00000000200002c0
RBP: 00007fefec9116c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fefec8de524
R13: 00007fefec8de540 R14: 00007fefec8dc051 R15: 0030656c69662f30
 </TASK>
Modules linked in:
---[ end trace c4d1177363ca447a ]---
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+0x2d8/0x530 fs/namei.c:3842
Code: 92 00 00 00 4c 89 7c 24 28 45 84 e4 0f 95 c0 83 7c 24 14 00 0f 94 c3 20 c3 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 1f 02 00 00 45 8b 26 41 bd 00 00 70 00 be
RSP: 0018:ffffc90000997cc0 EFLAGS: 00010206
RAX: 0000000000000003 RBX: 1ffff92000132f00 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000000
RBP: ffffc90000997db0 R08: ffffffff81c0d6a8 R09: ffffed10243bb2fa
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: 0000000000000600 R14: 0000000000000018 R15: ffffc90000997e60
FS:  00007fefec8456c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000a000 CR3: 000000011c2e5000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	92                   	xchg   %eax,%edx
   1:	00 00                	add    %al,(%rax)
   3:	00 4c 89 7c          	add    %cl,0x7c(%rcx,%rcx,4)
   7:	24 28                	and    $0x28,%al
   9:	45 84 e4             	test   %r12b,%r12b
   c:	0f 95 c0             	setne  %al
   f:	83 7c 24 14 00       	cmpl   $0x0,0x14(%rsp)
  14:	0f 94 c3             	sete   %bl
  17:	20 c3                	and    %al,%bl
  19:	4c 89 f0             	mov    %r14,%rax
  1c:	48 c1 e8 03          	shr    $0x3,%rax
  20:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  27:	fc ff df
* 2a:	0f b6 04 08          	movzbl (%rax,%rcx,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	0f 85 1f 02 00 00    	jne    0x255
  36:	45 8b 26             	mov    (%r14),%r12d
  39:	41 bd 00 00 70 00    	mov    $0x700000,%r13d
  3f:	be                   	.byte 0xbe