Sorry for the delay(time difference). Now I got more details.
# truss dtrace -l
----snip----
mmap(0x00000000, 4096, PROT_READ|PROT_WRITE|PROT_EXEC,
MAP_PRIVATE|MAP_ANON, 4294967295, 0) = 0xFFFFFD7FFF180000
mmap(0x00010000, 24576, PROT_READ|PROT_WRITE|PROT_EXEC,
MAP_PRIVATE|MAP_ANON|MAP_ALIGN, -1, 0) = 0xFFFFFD7FFF170000
munmap(0xFFFFFD7FFF380000, 32768)               = 0
getcontext(0xFFFFFD7FFFDFE9D0)
mmap(0x00010000, 65536, PROT_READ|PROT_WRITE|PROT_EXEC,
MAP_PRIVATE|MAP_ANON|MAP_ALIGN, 4294967295, 0) = 0xFFFFFD7FFF150000
getrlimit(RLIMIT_STACK, 0xFFFFFD7FFFDFED30)     = 0
getpid()                                        = 923 [922]
lwp_private(0, 0, 0xFFFFFD7FFF150200)           = 0x00000000
setustack(0xFFFFFD7FFF1502A8)
sysconfig(_CONFIG_PAGESIZE)                     = 4096
sigfillset(0xFFFFFD7FFF006880)                  = 0
brk(0x0041B580)                                 = 0
brk(0x0041F580)                                 = 0
getrlimit(RLIMIT_NOFILE, 0xFFFFFD7FFFDFEE80)    = 0
setrlimit(RLIMIT_NOFILE, 0xFFFFFD7FFFDFEE80)    = 0
openat(AT_FDCWD, "/dev/dtrace/provider", O_RDONLY|O_NDELAY|O_LARGEFILE) = 3
fcntl(3, F_SETFD, 0x00000001)                   = 0
fstat(3, 0xFFFFFD7FFFDFE8E0)                    = 0
getdents(3, 0xFFFFFD7FFF174000, 8192) (sleeping...)
-----------here, dtrace sleep almost 4 minutes--------
...and continue...


Any thoughts?

Thanks,
-Aubrey
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