general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 0 PID: 375 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:d_really_is_positive include/linux/dcache.h:503 [inline]
RIP: 0010:open_or_create_special_dir+0x89/0x1d0 fs/incfs/vfs.c:480
Code: e8 0c fe 66 ff e9 07 01 00 00 e8 02 fe 66 ff 48 c7 c3 ea ff ff ff e9 f6 00 00 00 4c 89 6d d0 4c 8d 6b 30 4d 89 ef 49 c1 ef 03 <43> 80 3c 37 00 74 08 4c 89 ef e8 88 80 a5 ff 49 83 7d 00 00 74 26
RSP: 0018:ffffc90002c87af8 EFLAGS: 00010207
RAX: 0000000000000005 RBX: 0000000000000005 RCX: ffff88810fd0a780
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 00000000ffffffff
RBP: ffffc90002c87b30 R08: dffffc0000000000 R09: ffffed10240ed815
R10: ffffed10240ed815 R11: 1ffff110240ed814 R12: ffff88812076c000
R13: 0000000000000035 R14: dffffc0000000000 R15: 0000000000000006
FS:  00007f6819b2a6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6819b29f98 CR3: 000000012ce07000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 incfs_mount_fs+0x42f/0x880 fs/incfs/vfs.c:1884
 legacy_get_tree+0xed/0x190 fs/fs_context.c:611
 vfs_get_tree+0x89/0x260 fs/super.c:1530
 do_new_mount+0x25a/0xa20 fs/namespace.c:3034
 path_mount+0x675/0x1020 fs/namespace.c:3364
 do_mount fs/namespace.c:3377 [inline]
 __do_sys_mount fs/namespace.c:3585 [inline]
 __se_sys_mount+0x318/0x380 fs/namespace.c:3562
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3562
 x64_sys_call+0x6bf/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166
 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: 0033:0x7f6819cdb749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6819b2a038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f6819f32090 RCX: 00007f6819cdb749
RDX: 0000200000000180 RSI: 0000200000000080 RDI: 0000200000000000
RBP: 00007f6819d5ff91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6819f32128 R14: 00007f6819f32090 R15: 00007fff9cb7c128
 </TASK>
Modules linked in:
---[ end trace de56eaac482128b5 ]---
RIP: 0010:d_really_is_positive include/linux/dcache.h:503 [inline]
RIP: 0010:open_or_create_special_dir+0x89/0x1d0 fs/incfs/vfs.c:480
Code: e8 0c fe 66 ff e9 07 01 00 00 e8 02 fe 66 ff 48 c7 c3 ea ff ff ff e9 f6 00 00 00 4c 89 6d d0 4c 8d 6b 30 4d 89 ef 49 c1 ef 03 <43> 80 3c 37 00 74 08 4c 89 ef e8 88 80 a5 ff 49 83 7d 00 00 74 26
RSP: 0018:ffffc90002c87af8 EFLAGS: 00010207
RAX: 0000000000000005 RBX: 0000000000000005 RCX: ffff88810fd0a780
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 00000000ffffffff
RBP: ffffc90002c87b30 R08: dffffc0000000000 R09: ffffed10240ed815
R10: ffffed10240ed815 R11: 1ffff110240ed814 R12: ffff88812076c000
R13: 0000000000000035 R14: dffffc0000000000 R15: 0000000000000006
FS:  00007f6819b2a6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6819b29f98 CR3: 000000012ce07000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	e8 0c fe 66 ff       	call   0xff66fe11
   5:	e9 07 01 00 00       	jmp    0x111
   a:	e8 02 fe 66 ff       	call   0xff66fe11
   f:	48 c7 c3 ea ff ff ff 	mov    $0xffffffffffffffea,%rbx
  16:	e9 f6 00 00 00       	jmp    0x111
  1b:	4c 89 6d d0          	mov    %r13,-0x30(%rbp)
  1f:	4c 8d 6b 30          	lea    0x30(%rbx),%r13
  23:	4d 89 ef             	mov    %r13,%r15
  26:	49 c1 ef 03          	shr    $0x3,%r15
* 2a:	43 80 3c 37 00       	cmpb   $0x0,(%r15,%r14,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 ef             	mov    %r13,%rdi
  34:	e8 88 80 a5 ff       	call   0xffa580c1
  39:	49 83 7d 00 00       	cmpq   $0x0,0x0(%r13)
  3e:	74 26                	je     0x66