loadable cat bug?

[Peng Yu]

When I use the loadable cat, I may get the following error. The input
is a fifo in this specific case.

cat: cannot open /tmp/tmp.VXkbqFlPtH: Interrupted system call

So far, I can not make a minimal script to demonstrate the problem.
But if I replace it with coreutils cat in my code, the problem is
gone.

Does anybody know what could cause this error?

-- 
Regards,
Peng