The Boston Diaries

The ongoing saga of a programmer who doesn't live in Boston, nor does he even like Boston, but yet named his weblog/journal “The Boston Diaries.”

Go figure.

Thursday, April 23, 2020

Of course talking about a bug means its easier to find and fix the bug. Odd how that happens

Of course, after I point the finger to LibreSSL for the memory leak, I find the leak … in my own code.

Sigh.

Not knowing what else to do, I thought I would go through my TLS Lua module to make sure I didn't miss anything. That's when I noticed that I was keeping a reference to a connection so that I can deal with the callbacks from libtls. I was expecting the __gc() method to clean things up, but with a (non-weak) reference, that was never going to happen.

Yes, just because you are using a garbage collected language doesn't mean you can't still have memory leaks.

I verified that, yes indeed, the references were being kept around after the request was finished. It was then straightforward to fix the issue.

That's not to say that libtls still isn't leaking memory—it is, but (it seems) only when you initialize it (which means it's not as bad). But I'll know in a day or two if I fixed the leak. I hope that was it.

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