The following instrument segfaults*:

instr 1
k1 oscil 500, .1, 1
a1 oscil 1, abs(k1), 1
fs1 pvsanal a1, 1024, 256, 1024, 1
fs2 pvsanal a1, 1024, 256, 1024, 1
pvsout fs1, 0
pvsout fs2, 1
outs a1, a1
endin

But works fine if both pvsout opcodes communicate on the same channel.
I assume this is not the expected behaviour?

*Csound version 5.17.11 (double samples) May 30 2012