Elara pulled up a second monitor. “Show me a failure.”
void *escape = labyrinth; if (!escape) panic("No way out. System halts."); “If alloc_page fails in an atomic context,” Kai said, “the kernel can’t wait to free memory. It either has a pre-prepared escape route—this page—or it dies. The labyrinth is that route. A guaranteed room, reserved ahead of time, that you only enter when the world is collapsing.”
“Exactly,” Kai said. “Theseus had a thread. We have a page.” #define labyrinth (void *)alloc_page(gfp_atomic)
Elara leaned back. “Explain it like I’m a CPU.”
“That’s the trick. The kernel returns a struct page * . But a labyrinth isn’t a structure—it’s a raw void. Just an address. A place where you don’t know the rules yet. You step inside, and you have to map it yourself.” Elara pulled up a second monitor
Elara nodded slowly. “So the name isn’t poetic. It’s diagnostic. If you see ‘labyrinth’ in a backtrace, you know: we’re in the emergency page, running atomic, don’t sleep, don’t fault .”
Kai typed:
#define labyrinth (void *)alloc_page(gfp_atomic) “This,” she said, pointing at the screen, “is either the cleverest thing you’ve written or the start of your villain origin story.”