general protection fault, probably for non-canonical address 0xdffffc0000000007: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]
CPU: 0 PID: 3643 Comm: syz.9.980 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:503 [inline]
RIP: 0010:fuse_atomic_open+0x2bd/0x2500 fs/fuse/dir.c:875
Code: ff 44 89 f8 83 e0 40 75 07 e8 2f b3 6f ff eb 33 4c 89 6c 24 08 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 45 24 af ff 49 83 3f 00 74 57 e8 fa
RSP: 0018:ffffc90000dc7340 EFLAGS: 00010202
RAX: 0000000000000007 RBX: fffff520001b8e80 RCX: dffffc0000000000
RDX: 0000000000000002 RSI: 0000000000000040 RDI: 0000000000000000
RBP: ffffc90000dc7970 R08: ffff888116bc8000 R09: fffff520001b8ddc
R10: 00000000fffffffe R11: 0000000000000002 R12: ffff888112f54d80
R13: 000000000000000a R14: 000000000000000a R15: 000000000000003a
FS:  00007f60383626c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6038362d58 CR3: 000000010e160000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 atomic_open fs/namei.c:3333 [inline]
 lookup_open fs/namei.c:3441 [inline]
 open_last_lookups fs/namei.c:3540 [inline]
 path_openat+0x129f/0x2f80 fs/namei.c:3747
 do_filp_open+0x1df/0x400 fs/namei.c:3777
 do_sys_openat2+0x15e/0x7f0 fs/open.c:1236
 do_sys_open fs/open.c:1252 [inline]
 __do_sys_openat fs/open.c:1268 [inline]
 __se_sys_openat fs/open.c:1263 [inline]
 __x64_sys_openat+0x136/0x160 fs/open.c:1263
 x64_sys_call+0x219/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f603994ae59
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:00007f6038362028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f6039bd3180 RCX: 00007f603994ae59
RDX: 000000000000275a RSI: 0000200000002180 RDI: ffffffffffffff9c
RBP: 00007f60399e0e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6039bd3218 R14: 00007f6039bd3180 R15: 00007ffc407083d8
 </TASK>
Modules linked in:
---[ end trace 35b266df20f17a85 ]---
RIP: 0010:d_really_is_positive include/linux/dcache.h:503 [inline]
RIP: 0010:fuse_atomic_open+0x2bd/0x2500 fs/fuse/dir.c:875
Code: ff 44 89 f8 83 e0 40 75 07 e8 2f b3 6f ff eb 33 4c 89 6c 24 08 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 45 24 af ff 49 83 3f 00 74 57 e8 fa
RSP: 0018:ffffc90000dc7340 EFLAGS: 00010202
RAX: 0000000000000007 RBX: fffff520001b8e80 RCX: dffffc0000000000
RDX: 0000000000000002 RSI: 0000000000000040 RDI: 0000000000000000
RBP: ffffc90000dc7970 R08: ffff888116bc8000 R09: fffff520001b8ddc
R10: 00000000fffffffe R11: 0000000000000002 R12: ffff888112f54d80
R13: 000000000000000a R14: 000000000000000a R15: 000000000000003a
FS:  00007f60383626c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7aaf3a64b8 CR3: 000000010e160000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	ff 44 89 f8          	incl   -0x8(%rcx,%rcx,4)
   4:	83 e0 40             	and    $0x40,%eax
   7:	75 07                	jne    0x10
   9:	e8 2f b3 6f ff       	call   0xff6fb33d
   e:	eb 33                	jmp    0x43
  10:	4c 89 6c 24 08       	mov    %r13,0x8(%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 45 24 af ff       	call   0xffaf247d
  38:	49 83 3f 00          	cmpq   $0x0,(%r15)
  3c:	74 57                	je     0x95
  3e:	e8                   	.byte 0xe8
  3f:	fa                   	cli