BUG: kernel NULL pointer dereference, address: 0000000000000039
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 10b36b067 P4D 10b36b067 PUD 10b2f8067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP
CPU: 0 PID: 354 Comm: syz-executor.0 Not tainted 6.1.1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
RIP: 0010:d_really_is_positive include/linux/dcache.h:485 [inline]
RIP: 0010:fuse_atomic_open+0x8c/0x140 fs/fuse/dir.c:858
Code: ff ff 49 89 c4 48 3d 01 f0 ff ff 72 05 45 89 e6 eb 2d 4d 85 e4 4d 0f 45 fc 4c 89 f2 48 8b 4d d0 44 8b 45 cc 41 f6 c5 40 74 07 <49> 83 7f 30 00 74 20 48 89 d7 4c 89 e6 e8 62 d8 e9 ff 41 89 c6 44
RSP: 0018:ffffc9000077fc98 EFLAGS: 00010202
RAX: 0000000000000009 RBX: ffff88810baf6300 RCX: ffff88810a7a3000
RDX: ffff88810b1b8b00 RSI: 0000000000000001 RDI: ffff88810baf6628
RBP: ffffc9000077fcd0 R08: 0000000000008000 R09: ffffffff8153156f
R10: ffff888111e699c0 R11: ffff888100041400 R12: 0000000000000009
R13: 0000000000008241 R14: ffff88810b1b8b00 R15: 0000000000000009
FS:  00007f4a427ff6c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000039 CR3: 000000010b2d8000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 atomic_open fs/namei.c:3276 [inline]
 lookup_open fs/namei.c:3384 [inline]
 open_last_lookups fs/namei.c:3481 [inline]
 path_openat+0x3e2/0xb60 fs/namei.c:3711
 do_filp_open+0xad/0x150 fs/namei.c:3741
 do_sys_openat2+0x8c/0x160 fs/open.c:1312
 do_sys_open fs/open.c:1328 [inline]
 __do_sys_creat fs/open.c:1404 [inline]
 __se_sys_creat fs/open.c:1398 [inline]
 __x64_sys_creat+0x44/0x60 fs/open.c:1398
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f4a42c7cb29
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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:00007f4a427ff0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f4a42d9c050 RCX: 00007f4a42c7cb29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000000
RBP: 00007f4a42cc847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f4a42d9c050 R15: 00007ffc1af6b9d8
 </TASK>
Modules linked in:
CR2: 0000000000000039
---[ end trace 0000000000000000 ]---
RIP: 0010:d_really_is_positive include/linux/dcache.h:485 [inline]
RIP: 0010:fuse_atomic_open+0x8c/0x140 fs/fuse/dir.c:858
Code: ff ff 49 89 c4 48 3d 01 f0 ff ff 72 05 45 89 e6 eb 2d 4d 85 e4 4d 0f 45 fc 4c 89 f2 48 8b 4d d0 44 8b 45 cc 41 f6 c5 40 74 07 <49> 83 7f 30 00 74 20 48 89 d7 4c 89 e6 e8 62 d8 e9 ff 41 89 c6 44
RSP: 0018:ffffc9000077fc98 EFLAGS: 00010202
RAX: 0000000000000009 RBX: ffff88810baf6300 RCX: ffff88810a7a3000
RDX: ffff88810b1b8b00 RSI: 0000000000000001 RDI: ffff88810baf6628
RBP: ffffc9000077fcd0 R08: 0000000000008000 R09: ffffffff8153156f
R10: ffff888111e699c0 R11: ffff888100041400 R12: 0000000000000009
R13: 0000000000008241 R14: ffff88810b1b8b00 R15: 0000000000000009
FS:  00007f4a427ff6c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000039 CR3: 000000010b2d8000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	49 89 c4             	mov    %rax,%r12
   3:	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax
   9:	72 05                	jb     0x10
   b:	45 89 e6             	mov    %r12d,%r14d
   e:	eb 2d                	jmp    0x3d
  10:	4d 85 e4             	test   %r12,%r12
  13:	4d 0f 45 fc          	cmovne %r12,%r15
  17:	4c 89 f2             	mov    %r14,%rdx
  1a:	48 8b 4d d0          	mov    -0x30(%rbp),%rcx
  1e:	44 8b 45 cc          	mov    -0x34(%rbp),%r8d
  22:	41 f6 c5 40          	test   $0x40,%r13b
  26:	74 07                	je     0x2f
* 28:	49 83 7f 30 00       	cmpq   $0x0,0x30(%r15) <-- trapping instruction
  2d:	74 20                	je     0x4f
  2f:	48 89 d7             	mov    %rdx,%rdi
  32:	4c 89 e6             	mov    %r12,%rsi
  35:	e8 62 d8 e9 ff       	call   0xffe9d89c
  3a:	41 89 c6             	mov    %eax,%r14d
  3d:	44                   	rex.R