Comment 6 for bug 1432786

strace output is here:
https://kojipkgs.fedoraproject.org//work/tasks/7470/9767470/build.log

It's frankly bizarre. The last system calls are:

open("/dev/urandom", O_RDONLY|O_LARGEFILE) = 3
fcntl64(3, F_GETFD) = 0
fcntl64(3, F_SETFD, FD_CLOEXEC) = 0
fstat64(3, {st_mode=S_IFCHR|0444, st_rdev=makedev(1, 9), ...}) = 0
clock_gettime(CLOCK_REALTIME, {1431870340, 192190777}) = 0
getrusage(0x1 /* RUSAGE_??? */, {ru_utime={0, 330000}, ru_stime={0, 55000}, ...}
) = 0
read(3, "*\222:\253\26\211\313\245\6KF\256Bm\242\363s\202>`u\223\6*1\351\234\324
E\362\347j", 32) = 32
read(3, "83\313y\206\10\316^\226\342&\266;R3\215\375\350\227\363+\16?\210LTy\345
v.\251\243", 32) = 32
read(3, "\231\302\270,\311\271z\324", 8) = 8
gettimeofday({1431870340, 198569}, NULL) = 0
gettimeofday({1431870340, 198647}, NULL) = 0

... and gettimeofday repeats in a loop forever. The context looks as
if it is a bug in libselinux.