I have an even better example of bugs in the kernel bug database languishing. Bug #2645 - msync() does not update the st_mtime and st_ctime fields (http://bugzilla.kernel.org/show_bug.cgi?id=2645). A relatively clear cut bug that is easily reproduced on any machine, and can even cause dataloss (because mtime isn't updated, most incremental backup systems will ignore the file, as it doesn't seem to have changed). The bug was reported in 2004, and only just now something is starting to happen in this regard, eventhough several patches for this problem have appeared on linux-kernel. Quite underwhelming.
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