Mongo shell shutdown calls ls. The shell's implementation of ls calls listFiles, which calls file_size on every file in the directory, which throws a boost filesystem exception on symlinks, which are immediately caught.

SERVER-98918 overwrote __cxa_throw with a custom implementation to print a stack trace which appears to be slower than original. Engineers may have many symlinks in their mongo/ directory due to use of db-contrib-tool. This results in shell shutdown when running resmoke locally taking a long time and printing this error: 

[js_test:profile_count:ValidateCollections] {"t":{"$date":"2025-02-06T21:16:20.449Z"},"s":"W",  "c":"CONTROL",  "id":9891800, "ctx":"main","msg":"Threw exception","attr":{"type":"N5boost10filesystem16filesystem_errorE"}} 

many times on shutdown.

The boost docs indicate that file_size should only be called on files which exist and are regular files.