general protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000048-0x000000000000004f]
CPU: 1 PID: 623 Comm: syz.4.67 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:d_really_is_positive include/linux/dcache.h:499 [inline]
RIP: 0010:fuse_atomic_open+0x2d6/0x2200 fs/fuse/dir.c:853
Code: 75 ff 44 89 f8 83 e0 40 75 07 e8 15 f5 75 ff eb 32 4c 89 2c 24 4d 8d 7d 30 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ff e8 8c 6b b0 ff 49 83 3f 00 74 57 e8 e1
RSP: 0018:ffffc90000d573a0 EFLAGS: 00010207
RAX: 0000000000000009 RBX: fffff520001aae88 RCX: dffffc0000000000
RDX: ffff88811acca780 RSI: 0000000000000040 RDI: 0000000000000000
RBP: ffffc90000d579b0 R08: ffff88811acca780 R09: fffff520001aade8
R10: 00000000fffffffe R11: 0000000000000002 R12: ffff88812b804000
R13: 000000000000001c R14: 000000000000001c R15: 000000000000004c
FS:  00007f383cd9a6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000013c0 CR3: 000000010ffce000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 atomic_open fs/namei.c:3122 [inline]
 lookup_open fs/namei.c:3227 [inline]
 open_last_lookups fs/namei.c:3325 [inline]
 path_openat+0x12ca/0x3040 fs/namei.c:3514
 do_filp_open+0x1df/0x400 fs/namei.c:3544
 do_sys_openat2+0x19f/0x750 fs/open.c:1219
 do_sys_open fs/open.c:1235 [inline]
 __do_sys_openat fs/open.c:1251 [inline]
 __se_sys_openat fs/open.c:1246 [inline]
 __x64_sys_openat+0x136/0x160 fs/open.c:1246
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f383e381e59
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:00007f383cd9a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f383e5fb180 RCX: 00007f383e381e59
RDX: 0000000000060a41 RSI: 00002000000013c0 RDI: ffffffffffffff9c
RBP: 00007f383e417d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0b3836f6d7a15f29 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f383e5fb218 R14: 00007f383e5fb180 R15: 00007ffd23b70288
Modules linked in:
---[ end trace e5da9a64f803f9f4 ]---
RIP: 0010:d_really_is_positive include/linux/dcache.h:499 [inline]
RIP: 0010:fuse_atomic_open+0x2d6/0x2200 fs/fuse/dir.c:853
Code: 75 ff 44 89 f8 83 e0 40 75 07 e8 15 f5 75 ff eb 32 4c 89 2c 24 4d 8d 7d 30 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ff e8 8c 6b b0 ff 49 83 3f 00 74 57 e8 e1
RSP: 0018:ffffc90000d573a0 EFLAGS: 00010207
RAX: 0000000000000009 RBX: fffff520001aae88 RCX: dffffc0000000000
RDX: ffff88811acca780 RSI: 0000000000000040 RDI: 0000000000000000
RBP: ffffc90000d579b0 R08: ffff88811acca780 R09: fffff520001aade8
R10: 00000000fffffffe R11: 0000000000000002 R12: ffff88812b804000
R13: 000000000000001c R14: 000000000000001c R15: 000000000000004c
FS:  00007f383cd9a6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b47f598af8 CR3: 000000010ffce000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	75 ff                	jne    0x1
   2:	44 89 f8             	mov    %r15d,%eax
   5:	83 e0 40             	and    $0x40,%eax
   8:	75 07                	jne    0x11
   a:	e8 15 f5 75 ff       	call   0xff75f524
   f:	eb 32                	jmp    0x43
  11:	4c 89 2c 24          	mov    %r13,(%rsp)
  15:	4d 8d 7d 30          	lea    0x30(%r13),%r15
  19:	4c 89 f8             	mov    %r15,%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:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	4c 89 ff             	mov    %r15,%rdi
  33:	e8 8c 6b b0 ff       	call   0xffb06bc4
  38:	49 83 3f 00          	cmpq   $0x0,(%r15)
  3c:	74 57                	je     0x95
  3e:	e8                   	.byte 0xe8
  3f:	e1                   	.byte 0xe1