processkicker.py

#!/usr/bin/python3

import ctypes
import sys
import os
import time

PTRACE_ATTACH = 16
PTRACE_DETACH = 17

try:
    pid = int(sys.argv[1])
except:
    print("Usage: prog <pid>")
    exit()

libc = ctypes.CDLL('/lib/x86_64-linux-gnu/libc.so.6')
libc.ptrace.argtypes = [ctypes.c_uint64, ctypes.c_uint64, ctypes.c_void_p, ctypes.c_void_p]
libc.ptrace.restype = ctypes.c_uint64

def logstat(tid, stat):
    if os.WIFSTOPPED(stat[1]):
        if os.WSTOPSIG(stat[1]) == 19:
            pass
        else:
            print("ERROR: tid [{}] - stopped for some other signal? {}".format(tid, os.WSTOPSIG(stat[1])))
    else:
        print("ERROR: tid [{}] - unknown results: {}".format(tid, stat[1]))

def suspend(tid):
    ret = libc.ptrace(PTRACE_ATTACH, tid, None, None)
    if -1 != ret:
        stat = os.waitpid(tid, 0)
        logstat(tid, stat)
    else:
        print('ERROR: ptrace(PTRACE_ATTACH, {}) returned {}'.format(tid, ret))

def resume(tid):
    ret = libc.ptrace(PTRACE_DETACH, tid, None, None)
    if -1 != ret:
        try:
            stat = os.waitpid(tid, 0)
        except ChildProcessError as e:
            if 10 != e.errno:
                print('ERROR: waitpid after PTRACE_DETACH threw {}'.format(tid, e))
    else:
        print('ERROR: ptrace(PTRACE_DETACH, {}) returned {}'.format(tid, ret))

taskDir = '/proc/{}/task'.format(pid)
tids = list(os.listdir(taskDir))
for f in tids:
    tid = int(f)
    suspend(tid)
    resume(tid)

print('INFO: signaled {} threads...'.format(len(tids)))