This bug means I cannot enable Linux kernel hardening features, when using Debian 11's gcc and backport kernel.
GCC_PLUGIN_RANDSTRUCT "Randomize layout of sensitive kernel structures"
https://github.com/torvalds/linux/blob/master/scripts/gcc-plugins/Kconfig#L49
GCC_PLUGIN_STACKLEAK "Poison kernel stack before returning from syscalls"
https://github.com/torvalds/linux/blob/master/security/Kconfig.hardening#L152
GCC_PLUGIN_STRUCTLEAK
https://github.com/torvalds/linux/blob/master/security/Kconfig.hardening#L4
The specific kernel I tested was
https://snapshot.debian.org/archive/debian/20211015T150402Z/pool/main/l/linux/linux_5.14.9-2%7Ebpo11%2B1.dsc
