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by wasabiketchup
452 days ago
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Fun one: I work on a server software of online backups for customers. We do daily thousands of mount/umount of a particular filesystem.
Once every month or so, we get an issue where a file timestamp fails to save, the error happens at the filesystem level. Hard to reproduce! It's a filesystem bug! So it's full theorical, reading code and seeing how it would happen. Found out after a while, the conditions were fun. I don't remember exactly, but it was like, you need to follow these steps :
1/ Create a folder
2/ Create in it 99 files (no more no less)
3/ Create a new folder
4/ Copy the first of the 99 files in the new folder The issue was linked to some data structure caching, and cache eviction. Had fun finding it out! |
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