general protection fault, probably for non-canonical address 0xdffffc0000000007: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]
CPU: 1 PID: 363 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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 7c cb 64 ff e9 07 01 00 00 e8 72 cb 64 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 d8 f9 a3 ff 49 83 7d 00 00 74 26
RSP: 0018:ffffc90000b37af8 EFLAGS: 00010202
RAX: 0000000000000008 RBX: 0000000000000008 RCX: ffff88810bed0000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 00000000ffffffff
RBP: ffffc90000b37b30 R08: ffff888120771ba7 R09: 1ffff110240ee374
R10: dffffc0000000000 R11: ffffed10240ee375 R12: ffff888120771b00
R13: 0000000000000038 R14: dffffc0000000000 R15: 0000000000000007
FS: 00007fcbe25ca6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcbe25a8ff8 CR3: 000000011e914000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
incfs_mount_fs+0x42f/0x890 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+0x659/0xff0 fs/namespace.c:3364
do_mount fs/namespace.c:3377 [inline]
__do_sys_mount fs/namespace.c:3585 [inline]
__se_sys_mount+0x320/0x390 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: 0033:0x7fcbe2767799
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:00007fcbe25ca028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fcbe29e0fa0 RCX: 00007fcbe2767799
RDX: 0000200000000780 RSI: 0000200000000140 RDI: 0000200000000580
RBP: 00007fcbe27fdbd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcbe29e1038 R14: 00007fcbe29e0fa0 R15: 00007ffdf5c42278
</TASK>
Modules linked in:
---[ end trace 9b56888c23155ee6 ]---
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 7c cb 64 ff e9 07 01 00 00 e8 72 cb 64 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 d8 f9 a3 ff 49 83 7d 00 00 74 26
RSP: 0018:ffffc90000b37af8 EFLAGS: 00010202
RAX: 0000000000000008 RBX: 0000000000000008 RCX: ffff88810bed0000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 00000000ffffffff
RBP: ffffc90000b37b30 R08: ffff888120771ba7 R09: 1ffff110240ee374
R10: dffffc0000000000 R11: ffffed10240ee375 R12: ffff888120771b00
R13: 0000000000000038 R14: dffffc0000000000 R15: 0000000000000007
FS: 00007fcbe25ca6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcbe25a8ff8 CR3: 000000011e914000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: e8 7c cb 64 ff call 0xff64cb81
5: e9 07 01 00 00 jmp 0x111
a: e8 72 cb 64 ff call 0xff64cb81
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 d8 f9 a3 ff call 0xffa3fa11
39: 49 83 7d 00 00 cmpq $0x0,0x0(%r13)
3e: 74 26 je 0x66