I've found the issue, the clients were performing ::readv calls with iovcnt = 2044, which goes over the max system limit of 1024. I've made a PR that fixes it by bringing down the max dlen to ~2MB, which makes the clients calculate the right size. For future proofing, some error catching on XrdCl/XrdClAsyncPageReader.hh::InitIOV when iovcnt goes over limit would be nice. currently it just returns from the initialization with no errors in that case, as the clauses are tied with having dleft=0
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