diff --git a/backend/apps/ifc_validation/tasks/check_programs.py b/backend/apps/ifc_validation/tasks/check_programs.py
index 57cdf154..50e5d262 100644
--- a/backend/apps/ifc_validation/tasks/check_programs.py
+++ b/backend/apps/ifc_validation/tasks/check_programs.py
@@ -3,6 +3,7 @@
 import json
 import subprocess
 from typing import List
+from dataclasses import dataclass
 
 from apps.ifc_validation_models.settings import TASK_TIMEOUT_LIMIT
 from apps.ifc_validation_models.models import ValidationTask
@@ -10,6 +11,42 @@
 from .logger import logger
 from .context import TaskContext
 
+@dataclass
+class proc_output:
+    returncode : int
+    stdout : str
+    stderr : str
+    args: List[str]
+
+
+def run_subprocess_wait(*popen_args, check=False, **popen_kwargs):
+    process = subprocess.Popen(*popen_args, **popen_kwargs)
+    out_chunks, err_chunks = [], []
+    try:
+        while True:
+            try:
+                stdout, stderr = process.communicate(timeout=0.2)
+                out_chunks.append(stdout or "")
+                err_chunks.append(stderr or "")
+                break
+            except subprocess.TimeoutExpired:
+                # keep looping; you can also check your own stop conditions here
+                continue
+    except BaseException as e:
+        process.terminate()
+        try:
+            process.wait(timeout=5)
+        except subprocess.TimeoutExpired:
+            process.kill()
+            process.wait()
+        raise
+    retcode = process.returncode
+    stdout, stderr = "".join(out_chunks), "".join(err_chunks)
+    if check and retcode != 0:
+        raise subprocess.CalledProcessError(retcode, popen_args[0], output=stdout, stderr=stderr)
+    return proc_output(retcode, stdout, stderr, popen_args[0] if popen_args else [])
+
+
 checks_dir = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "checks"))
 
 def check_syntax(context:TaskContext):
@@ -168,7 +205,10 @@ def check_instance_completion(context:TaskContext):
 
 def check_proc_success_or_fail(proc, task):
     if proc.returncode is not None and proc.returncode != 0:
-        error_message = f"Running {' '.join(proc.args)} failed with exit code {proc.returncode}\n{proc.stdout}\n{proc.stderr}"
+        error_message = (
+            f"Subprocess failed with exit code {proc.returncode}\n"
+            f"{proc.stdout}\n{proc.stderr}"
+        )
         task.mark_as_failed(error_message)
         raise RuntimeError(error_message)
     return proc.stdout
@@ -176,16 +216,15 @@ def check_proc_success_or_fail(proc, task):
 def run_subprocess(
     task: ValidationTask,
     command: List[str],
-) -> subprocess.CompletedProcess[str]:
+) -> proc_output:
     logger.debug(f'Command for {task.type}: {" ".join(command)}')
     task.set_process_details(None, command)
     try:
-        proc = subprocess.run(
+        proc = run_subprocess_wait(
             command,
             stdout=subprocess.PIPE,
             stderr=subprocess.PIPE,
             text=True,
-            timeout=TASK_TIMEOUT_LIMIT,
             env= os.environ.copy()
         )
         logger.info(f'test run task task name {task.type}, task value : {task}')
@@ -193,5 +232,5 @@ def run_subprocess(
     
     except Exception as err:
         logger.exception(f"{type(err).__name__} in task {task.id} : {task.type}")
-        task.mark_as_failed(err)
+        task.mark_as_failed(str(err))
         raise type(err)(f"Unknown error during validation task {task.id}: {task.type}") from err
\ No newline at end of file
diff --git a/backend/apps/ifc_validation/tasks/task_runner.py b/backend/apps/ifc_validation/tasks/task_runner.py
index f21d7df8..799f7d9b 100644
--- a/backend/apps/ifc_validation/tasks/task_runner.py
+++ b/backend/apps/ifc_validation/tasks/task_runner.py
@@ -11,17 +11,47 @@
 from .utils import get_absolute_file_path
 from .logger import logger
 from .email_tasks import *
+import psutil
+from celery.exceptions import SoftTimeLimitExceeded
+
+
+def terminate_subprocesses():
+    parent = psutil.Process()
+    children = parent.children(recursive=True)
+    logger.debug(f"found child pids: {' '.join(map(str, (c.pid for c in children)))}")
+
+    for child in children:
+        try:
+            child.terminate()
+            logger.debug(f"terminated {child.pid}")
+        except psutil.NoSuchProcess:
+            logger.debug(f"no such process {child.pid}")
+            pass
+
+    _, alive = psutil.wait_procs(children, timeout=10)
+    logger.debug(f"processes still alive: {' '.join(map(str, (c.pid for c in alive)))}")
+    for child in alive:
+        try:
+            child.kill()
+            logger.debug(f"killed {child.pid}")
+        except psutil.NoSuchProcess:
+            logger.debug(f"no such process {child.pid}")
+            pass
+
+
+def kill_subprocesses_on_timeout(task_func):
+    @functools.wraps(task_func)
+    def wrapper(*args, **kwargs):
+        try:
+            return task_func(*args, **kwargs)
+        except SoftTimeLimitExceeded:
+            terminate_subprocesses()
+            raise
+    return wrapper
 
 
 assert task_registry.total_increment() == 100
 
-def check_proc_success_or_fail(proc, task):
-    if proc.returncode is not None and proc.returncode != 0:
-        error_message = f"Running {' '.join(proc.args)} failed with exit code {proc.returncode}\n{proc.stdout}\n{proc.stderr}"
-        task.mark_as_failed(error_message)
-        raise RuntimeError(error_message)
-    return proc.stdout
-
 @shared_task(bind=True)
 @log_execution
 def error_handler(self, *args, **kwargs):
@@ -97,6 +127,7 @@ def task_factory(task_type):
     @shared_task(bind=True, name=config.celery_task_name)
     @log_execution
     @requires_django_user_context
+    @kill_subprocesses_on_timeout
     def validation_subtask_runner(self, *args, **kwargs):
     
         id = kwargs.get('id')