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This. I earned a reputation at my team at Google for debugging gnarly bugs. It was one of the most fun parts of the job. You've all seen that Go runtime bug story on my blog, which was after I left, but the stories inside were fun too. Highlights include: (thread)https://twitter.com/erincandescent/status/1281290723443294208 …
Replicated and cross checked process randomly fails due to an *offset* (not data) mismatch between both replicas, on the order of once a petabyte. Cause: Google's internal optimized zlib implementation had a buffer overflow read that very rarely caused correct but *longer* output
Service crashes upon receiving a protobuf with wrong schema. Root cause: producer server had kernel paniced, data not flushed to disk (but metadata was). On reboot picked up garbage sectors, happened to contain valid data from another process, format is self-synchronizing.
Bonus points for debugging that one entirely from logs and records of a single occurrence (and concluding beyond reasonable doubt that that's what had happened based on stuff like suspect offsets lining up on 512 byte boundaries), plus sec impact (data was from another user).
There was also another Go bug after I left, which someone said was breaking Google production. Cgo callbacks back into Go would transiently break stack tracing after returning, causing the garbage collector to explode if it ran with the right timing. Repro was tricky.
Can't get away from fixing Google production even after you leave 
I mean, if you ever get bored and want to get paid to go bug hunting again...出来ること山程あるぞ
I hate that my current job is mostly being thrown bugs for : - legacy stuff I'm not allowed to upgrade/port (dependency/version rabbit hole, or ENOTIME) - proprietary stuff I can only work around ...and being told "oh well it's not important anyway, it's just to keep you busy."
The second part is especially vexing because it's vendor stuff and either they're dead companies, or I'm not allowed to talk to them/report that their stuff isn't working as intended.
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