[Bug: 21.5-b27] Hang when writing.

[Aidan Kehoe]

 Ar an triú lá déag de mí na Nollaig, scríobh Stephen J. Turnbull: 

 > This is probably due to some fiddling that Jerry and Tony Bennett @
 > nvidia (IIRC) did with lstream flushing to fix a different timing bug.
 > Or it might be due to a commit I made (also originally from Tony) to
 > cut down the initial timeout when waiting for a stuffed pipe to clear,
 > and gradually lengthen it.

It’s interesting that something unknown seems to be called recursively, or
the stack seems to be crashed. The other episodes I’ve had where it happened
have had much longer backtraces and what appear to be recursive calls. 

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