I have upgraded QtCreator to version 6. When I opened my project session clangd run out of memory and crashed my system. Sometimes it just crashes QtCreator:
[12437.692439] Out of memory: Killed process 56361 (clangd.main) total-vm: 1033980kb, anon-ess: 564302kb, shmem-rss: 0kb, UID: 1000, pgtables: 1360kb, oom_score_adj: 0