supervise causes cpu spike

["Count László de Almásy" <calmasy@gmail.com>]

Hi,

I'm hoping someone can help me diagnose why supervising my OpenSim
process causes it to go up to 100% cpu, while when not supervised, I
have no such problems. This is on Debian/Linux amd64, with djb's
latest stock daemontools.

Here's my run script:

======
bee:/~# cat /service/opensim/run
#!/bin/sh
ulimit -s 262144
cd /home/opensim/opensim/bin
exec setuidgid opensim mono OpenSim.exe
======

stopping/restarting with svc works as expected. it's just, the cpu
goes right up to 100% with the supervised mono process. running strace
on the process shows what's happening:

read(0, ""..., 1024)                    = 0
read(0, ""..., 1024)                    = 0
read(0, ""..., 1024)                    = 0
read(0, ""..., 1024)                    = 0
read(0, ""..., 1024)                    = 0
read(0, ""..., 1024)                    = 0
read(0, ""..., 1024)                    = 0
read(0, ""..., 1024)                    = 0
read(0, ""..., 1024)                    = 0

[...]

over and over. it's like something is sending the process an empty
character repeatedly. Can someone tell me what I did wrong here, or
what is causing this?

-- 
Cheers, László