I noticed baloo_file_extractor (OpenSUSE Tumbleweed, package version 5.19.0-1.1) stuck at 100% for about 30 minutes trying to index a small tags file (the file exists and is readable, it was updated once). After about 30 minutes, the baloo file indexing daemon crashed (attached backtrace from KCrash reporter). Reproducible: Sometimes I attached an excerpt from strace and a backtrace of a crash that happened after ~30 minutes.
Created attachment 97589 [details] strace output
Created attachment 97590 [details] backtrace of crash
Created attachment 97591 [details] tags file that triggered the infinite loop
*** This bug has been marked as a duplicate of bug 378754 ***