general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
CPU: 1 PID: 366 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:493 [inline]
RIP: 0010:open_or_create_special_dir+0x89/0x1d0 fs/incfs/vfs.c:480
Code: e8 1c 4b 5a ff e9 07 01 00 00 e8 12 4b 5a 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 c8 9c 9f ff 49 83 7d 00 00 74 26
RSP: 0018:ffffc90000a47af8 EFLAGS: 00010202
RAX: 0000000000000010 RBX: 0000000000000010 RCX: ffff88811458bcc0
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 00000000ffffffff
RBP: ffffc90000a47b30 R08: ffff8881242fe2a7 R09: 1ffff1102485fc54
R10: dffffc0000000000 R11: ffffed102485fc55 R12: ffff8881242fe200
R13: 0000000000000040 R14: dffffc0000000000 R15: 0000000000000008
FS: 00007fc2cd58f6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc2cd58eff8 CR3: 000000012dcc9000 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:1890
legacy_get_tree+0xfe/0x1a0 fs/fs_context.c:632
vfs_get_tree+0x9a/0x270 fs/super.c:1578
do_new_mount+0x251/0xb30 fs/namespace.c:3081
path_mount+0x659/0xfc0 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: 0033:0x7fc2cc79c819
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:00007fc2cd58f028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fc2cca16090 RCX: 00007fc2cc79c819
RDX: 0000200000000180 RSI: 0000200000000080 RDI: 0000200000000000
RBP: 00007fc2cc832c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc2cca16128 R14: 00007fc2cca16090 R15: 00007ffc9bb245a8
</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+0x89/0x1d0 fs/incfs/vfs.c:480
Code: e8 1c 4b 5a ff e9 07 01 00 00 e8 12 4b 5a 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 c8 9c 9f ff 49 83 7d 00 00 74 26
RSP: 0018:ffffc90000a47af8 EFLAGS: 00010202
RAX: 0000000000000010 RBX: 0000000000000010 RCX: ffff88811458bcc0
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 00000000ffffffff
RBP: ffffc90000a47b30 R08: ffff8881242fe2a7 R09: 1ffff1102485fc54
R10: dffffc0000000000 R11: ffffed102485fc55 R12: ffff8881242fe200
R13: 0000000000000040 R14: dffffc0000000000 R15: 0000000000000008
FS: 00007fc2cd58f6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc2cc7e9f00 CR3: 000000012dcc9000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: e8 1c 4b 5a ff call 0xff5a4b21
5: e9 07 01 00 00 jmp 0x111
a: e8 12 4b 5a ff call 0xff5a4b21
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 c8 9c 9f ff call 0xff9f9d01
39: 49 83 7d 00 00 cmpq $0x0,0x0(%r13)
3e: 74 26 je 0x66