A Linux kernel vulnerability in the pid_namespace subsystem causes zap_pid_ns_processes() to be non-freezable, leading to indefinite waits when the init process of a pid namespace exits. This issue affects the kernel's ability to freeze tasks, causing suspend attempts to fail. The problem arises when a tracer outside the namespace does not reap traced zombies, keeping pids allocated indefinitely. This was notably triggered by Chromium-based browsers using crashpad for crash dumps.