the number of members in the group is zero.
Repetition step:
If using waitpid() to wait a task has exited, the waitpid will use
nxsing_kill with signal number 0 to determine if that task is still
alive, and will call group_signal to dispatch signal for each member
of the group and perform signal handing checks, it will assert at
sched/group/group_signal.c:261.
Change-Id: I75ef015a261101277436d742897ce68fed44b5da
Signed-off-by: Jiuzhu Dong <dongjiuzhu1@xiaomi.com>
5ec3ef0e56