bionic libc test test_clone fails

[tomxice]

Description

test_clone.c fails. The father process calls "clone" function and gets pid of its child process. But something goes wrong before father finish "waitpid" function.

Reproduce Steps

cd ~/ucore_plus/ucore
./uCore_test -s bionic -w 15 -t 45 -f src/user-ucore/testspecs/test_clone.testpec

Current Result

From the serial console:

kernel_execve: pid = 4, name = "/bionic-test/test_clone".
child pid 5
trapframe at 0x7b64fb0
r00 0x00000000
r01 0x00000000
r02 0x00000000
r03 0x00000000
r04 0x00000000
r05 0x30800750
r06 0x00000000
r07 0x0000001a
r08 0x00000000
r09 0x00000000
r10 0x00000000
fp 0x3080cfe4
ip 0x3080903c
usr_lr 0x6fe8529c
sp 0x3080cfb0
lr 0x6fe81124
spsr 0xa0000050 User
trap 0x00000002 Software interrupt
err 0x00000000
undefined syscall 0, pid = 5, name = .
file->fd:3
kernel panic at fs.c:64:
assertion failed: file->status == FD_NONE
Welcome to the kernel debug monitor!!

Expected Result

child pid 5
waitpid returned 5
child 5, status 0x137f

[geraint0923]

The undefined syscall is ptrace. After removing the calling of ptrace from source code, this error will gone.