On Sun, 18 Sep 2011 16:46:01 +0300, Mikolaj Golub wrote: MG> Could you please run ktrace with -i option? The behavior is like if MG> ptrace(PT_TRACE_ME) failed in the child by some reason. Unfortunately, truss MG> does not check this. ktrace -i for truss sleep 5 http://dl.dropbox.com/u/8798217/tmp/truss_ktrace2.txt -- Anton Yuzhaninov