Samuel
@samuel.fm
is uploadblob being weird, or is it firefox? keep seeing half-corrupted image previews
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David Buchanan
I've seen it aaaages go on youtube thumbnails once or twice, I wonder if it's a weird edge-case that bsky happens to trigger. Whatever it is, seems like some kinda non-deterministic memory corruption bug within the jpeg decoder which is kinda spooky.
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David Buchanan
so here's a fun observation. I have a screenshot of one of the corruptions I saw. I downloaded the image and re-created the same corruptions - the first corruption at least is consistent with a ~1400 byte chunk being missing from the file!
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David Buchanan
however, if there was a dropped packet, TCP along with TLS1.3 etc. really ought to prevent that from causing any application-level issues, so clearly there's a bug *somewhere*
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David Buchanan
So I narrowed it down some more and the missing chunk is exactly 1448 bytes long, at offset 4*1448 bytes into the file. aaand guess what
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Gordon Mohr ꧁🧿🧿꧂
reminds a bit of bugs I recall that were ultimately due to some malfunctioning network hardware on path between hosts – consistently losing bits in particular (often but not always reproducible) patterns with just certain remote-hosts/streams. …
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1 more reply
Ryan Castellucci 🜬
The TCP maximum segment size option is supposed to be advertising the the largest TCP payload it can accept *assuming no TCP options*. The sending host is responsible for subtracting the space its TCP options take from that.
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