btrfs double-free

The btrfs double-free tag on WindowsForum.com covers the Linux kernel vulnerability CVE-2026-46164, where Btrfs can double-free a space-info sub-group object when kobject_init_and_add() fails during filesystem initialization. This memory-management flaw resides in a specific error path and, while not yet scored or actively exploited, represents a security concern for Linux storage subsystems. Discussions focus on the technical details of the bug, its implications for kernel stability, and the one-line fix applied. The tag is relevant for Linux system administrators, kernel developers, and security professionals monitoring filesystem vulnerabilities.