Reliability #22

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orbisvicis opened this Issue Dec 13, 2012 · 1 comment

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I need to reptyr badblocks in non-destructive read-write mode after the X server locked up. However I feel this is especially representative of any critical I/O based applications.

I am probably being paranoid, and I've already tested reptyr/badblocks in a virtual machine, and everything appeared fine. But I would probably never notice a single scrambled bad block.

So my question is this: Theoretically, is it possible/plausible for reptyr to scramble the FDs, accidentally write junk to a bad sector, or any other nightmare, that would compromise the reliability of critical applications.

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nelhage commented Dec 13, 2012

reptyr does attach to the process via ptrace and perform operations in the process' address space, so it is theoretically possible for a bug somewhere to cause memory corruption. That said, I've written it with some care to minimize such risks, and never observed that sort of bug.

I do recommend testing reptyr on a dry-run against any super-critical processes, but if that works, I would be pretty confident that it will fail safely, if it does, rather than by silently corrupting data.

@nelhage nelhage closed this Dec 13, 2012

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