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First is btrfs kernel bug Qu Wenruo is talking about. Second is systemd issue, which amplifies this kernel bug. Systemd bug turns simple "suspend doesn't work, but system continues to operate normally" to "reboot is needed". I wrote about this here: https://github.com/systemd/systemd/issues/38337 . The bug is fixed in mainline and stable versions of systemd. So you should just upgrade your systemd. The fix is backported to stable systemd versions, so it should come to all stable Linux distros on its own. Suspend still will not work if scrub is running, but at least your system will be operational after failed suspend attempt. If this still doesn't help, then, please, tell me your full systemd version and distro version. -- Askar Safin