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: 400 Comm: syz-executor.3 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:d_really_is_positive include/linux/dcache.h:493 [inline]
RIP: 0010:open_or_create_special_dir+0x85/0x1f0 fs/incfs/vfs.c:482
Code: 1b e8 5f fc 59 ff e9 21 01 00 00 e8 55 fc 59 ff 48 c7 c3 ea ff ff ff e9 10 01 00 00 4c 89 f0 4c 8d 73 30 4d 89 f7 49 c1 ef 03 <41> 80 3c 07 00 74 08 4c 89 f7 e8 fc 88 9f ff 49 83 3e 00 74 2c e8
RSP: 0018:ffffc90001687b00 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000008 RCX: ffff888117308000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 00000000ffffffff
RBP: ffffc90001687b30 R08: ffff888123abe6e7 R09: 1ffff11024757cdc
R10: dffffc0000000000 R11: ffffed1024757cdd R12: ffff888123abe640
R13: ffffc90001687b7f R14: 0000000000000038 R15: 0000000000000007
FS:  00007f896c02a6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f896c008fd0 CR3: 000000012795b000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 incfs_mount_fs+0x42f/0x890 fs/incfs/vfs.c:1892
 legacy_get_tree+0xfe/0x1a0 fs/fs_context.c:632
 vfs_get_tree+0x9a/0x270 fs/super.c:1578
 do_new_mount+0x251/0xb40 fs/namespace.c:3081
 path_mount+0x640/0xfd0 fs/namespace.c:3411
 do_mount fs/namespace.c:3424 [inline]
 __do_sys_mount fs/namespace.c:3632 [inline]
 __se_sys_mount+0x320/0x390 fs/namespace.c:3609
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3609
 x64_sys_call+0x65d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f896b26e3b9
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 d0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f896c02a0b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f896b3ac050 RCX: 00007f896b26e3b9
RDX: 0000000020000180 RSI: 00000000200000c0 RDI: 0000000020000080
RBP: 00007f896b2cf498 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f896b3ac050 R15: 00007fff402b9f98
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:d_really_is_positive include/linux/dcache.h:493 [inline]
RIP: 0010:open_or_create_special_dir+0x85/0x1f0 fs/incfs/vfs.c:482
Code: 1b e8 5f fc 59 ff e9 21 01 00 00 e8 55 fc 59 ff 48 c7 c3 ea ff ff ff e9 10 01 00 00 4c 89 f0 4c 8d 73 30 4d 89 f7 49 c1 ef 03 <41> 80 3c 07 00 74 08 4c 89 f7 e8 fc 88 9f ff 49 83 3e 00 74 2c e8
RSP: 0018:ffffc90001687b00 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000008 RCX: ffff888117308000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 00000000ffffffff
RBP: ffffc90001687b30 R08: ffff888123abe6e7 R09: 1ffff11024757cdc
R10: dffffc0000000000 R11: ffffed1024757cdd R12: ffff888123abe640
R13: ffffc90001687b7f R14: 0000000000000038 R15: 0000000000000007
FS:  00007f896c02a6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff53c08f50 CR3: 000000012795b000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	1b e8                	sbb    %eax,%ebp
   2:	5f                   	pop    %rdi
   3:	fc                   	cld
   4:	59                   	pop    %rcx
   5:	ff                   	ljmp   (bad)
   6:	e9 21 01 00 00       	jmp    0x12c
   b:	e8 55 fc 59 ff       	call   0xff59fc65
  10:	48 c7 c3 ea ff ff ff 	mov    $0xffffffffffffffea,%rbx
  17:	e9 10 01 00 00       	jmp    0x12c
  1c:	4c 89 f0             	mov    %r14,%rax
  1f:	4c 8d 73 30          	lea    0x30(%rbx),%r14
  23:	4d 89 f7             	mov    %r14,%r15
  26:	49 c1 ef 03          	shr    $0x3,%r15
* 2a:	41 80 3c 07 00       	cmpb   $0x0,(%r15,%rax,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 f7             	mov    %r14,%rdi
  34:	e8 fc 88 9f ff       	call   0xff9f8935
  39:	49 83 3e 00          	cmpq   $0x0,(%r14)
  3d:	74 2c                	je     0x6b
  3f:	e8                   	.byte 0xe8