syzbot

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: 294 Comm: syz-executor544 Not tainted 5.10.209-syzkaller-00435-gdd976ecce2ce #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
RIP: 0010:d_really_is_positive include/linux/dcache.h:499 [inline]
RIP: 0010:fuse_atomic_open+0x27f/0x34e0 fs/fuse/dir.c:849
Code: e0 40 4c 8b 64 24 20 75 07 e8 1d b3 6c ff eb 37 48 8b 44 24 60 48 8d 58 30 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 f3 2b aa ff 48 83 3b 00 0f 84 a9 00
RSP: 0018:ffffc90000b572e0 EFLAGS: 00010202
RAX: 0000000000000007 RBX: 0000000000000038 RCX: dffffc0000000000
RDX: ffff88811ef8cf00 RSI: 0000000000000040 RDI: 0000000000000000
RBP: ffffc90000b57910 R08: ffffffff81fdf4c2 R09: ffffed10239264ec
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88811c932428
R13: ffff88811efaf000 R14: 1ffff9200016ae74 R15: 0000000000000008
FS:  00007efe0ffc86c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efe0ffc8d58 CR3: 000000011ef63000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 atomic_open fs/namei.c:3120 [inline]
 lookup_open fs/namei.c:3225 [inline]
 open_last_lookups fs/namei.c:3323 [inline]
 path_openat+0xff0/0x3000 fs/namei.c:3512
 do_filp_open+0x21c/0x460 fs/namei.c:3542
 do_sys_openat2+0x13f/0x6f0 fs/open.c:1217
 do_sys_open fs/open.c:1233 [inline]
 __do_sys_openat fs/open.c:1249 [inline]
 __se_sys_openat fs/open.c:1244 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1244
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7efe10027549
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 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:00007efe0ffc8218 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007efe100b43f8 RCX: 00007efe10027549
RDX: 0000000000080041 RSI: 00000000200001c0 RDI: 00000000ffffff9c
RBP: 00007efe100b43f0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007efe10081024
R13: 000000000000006e R14: 0030656c69662f30 R15: 2f30656c69662f2e
Modules linked in:
---[ end trace 5311a8bdb08fc1f5 ]---
RIP: 0010:d_really_is_positive include/linux/dcache.h:499 [inline]
RIP: 0010:fuse_atomic_open+0x27f/0x34e0 fs/fuse/dir.c:849
Code: e0 40 4c 8b 64 24 20 75 07 e8 1d b3 6c ff eb 37 48 8b 44 24 60 48 8d 58 30 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 f3 2b aa ff 48 83 3b 00 0f 84 a9 00
RSP: 0018:ffffc90000b572e0 EFLAGS: 00010202
RAX: 0000000000000007 RBX: 0000000000000038 RCX: dffffc0000000000
RDX: ffff88811ef8cf00 RSI: 0000000000000040 RDI: 0000000000000000
RBP: ffffc90000b57910 R08: ffffffff81fdf4c2 R09: ffffed10239264ec
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88811c932428
R13: ffff88811efaf000 R14: 1ffff9200016ae74 R15: 0000000000000008
FS:  00007efe0ffc86c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005609d7ea2a88 CR3: 000000011ef63000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	e0 40                	loopne 0x42
   2:	4c 8b 64 24 20       	mov    0x20(%rsp),%r12
   7:	75 07                	jne    0x10
   9:	e8 1d b3 6c ff       	call   0xff6cb32b
   e:	eb 37                	jmp    0x47
  10:	48 8b 44 24 60       	mov    0x60(%rsp),%rax
  15:	48 8d 58 30          	lea    0x30(%rax),%rbx
  19:	48 89 d8             	mov    %rbx,%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:	48 89 df             	mov    %rbx,%rdi
  33:	e8 f3 2b aa ff       	call   0xffaa2c2b
  38:	48 83 3b 00          	cmpq   $0x0,(%rbx)
  3c:	0f                   	.byte 0xf
  3d:	84                   	.byte 0x84
  3e:	a9                   	.byte 0xa9