Charles-François Natali <neolo...@free.fr> added the comment: It's actually an obvious case of heap fragmentation due to long-lived chunks being realloc()ed to a smaller size. Some malloc implementations can choke on this (e.g. OS-X's malloc is known to not shrink blocks when realloc() is called with a smaller size). The solution is simply to use a StringIO to avoid holding references to those blocks for too long. Patch attached.
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