avahi-daemon: polling with zero timeout

avahi-daemon on a network with many clients is doing poll() with a zero timeout and timing out immediately. This looks like a busy wait to me.

poll([{fd=6, events=POLLIN}, {fd=17, events=POLLIN}, {fd=16, events=POLLIN}, {fd=15, events=POLLIN}, {fd=14, events=POLLIN}, {fd=13, events=POLLIN}, {fd=12, events=POLLIN}, {fd=11, events=POLLIN}, {fd=10, events=POLLIN}, {fd=8, events=POLLIN}], 10, 0) = 0 (Timeout)
write(7, "W", 1) = 1
write(7, "W", 1) = 1
read(6, "WW", 10) = 2
poll([{fd=6, events=POLLIN}, {fd=17, events=POLLIN}, {fd=16, events=POLLIN}, {fd=15, events=POLLIN}, {fd=14, events=POLLIN}, {fd=13, events=POLLIN}, {fd=12, events=POLLIN}, {fd=11, events=POLLIN}, {fd=10, events=POLLIN}, {fd=8, events=POLLIN}], 10, 0) = 0 (Timeout)
write(7, "W", 1) = 1
write(7, "W", 1) = 1
read(6, "WW", 10) = 2
poll([{fd=6, events=POLLIN}, {fd=17, events=POLLIN}, {fd=16, events=POLLIN}, {fd=15, events=POLLIN}, {fd=14, events=POLLIN}, {fd=13, events=POLLIN}, {fd=12, events=POLLIN}, {fd=11, events=POLLIN}, {fd=10, events=POLLIN}, {fd=8, events=POLLIN}], 10, 0) = 0 (Timeout)
write(7, "W", 1) = 1
write(7, "W", 1) = 1
read(6, "WW", 10) = 2
poll([{fd=6, events=POLLIN}, {fd=17, events=POLLIN}, {fd=16, events=POLLIN}, {fd=15, events=POLLIN}, {fd=14, events=POLLIN}, {fd=13, events=POLLIN}, {fd=12, events=POLLIN}, {fd=11, events=POLLIN}, {fd=10, events=POLLIN}, {fd=8, events=POLLIN}], 10, 0) = 0 (Timeout)