To reproduce the crash, switch to a different session, it starts clangd, Then select a different target build (different kit), it starts a second clangd, Then switch back to the first session, a third clang is started.  System now crashes after about 10 seconds with all three clangds running.  Can crash doing nothing.  Pressing any keys (like trying to make a change, editing something in a file) seems to make it crash sooner.

[FYI First session has cmake project, second session has qmake project.  Both projects have 330 files, so clangd takes some time to process all using 8 cores]