diff --git a/extra/hcqfuzz/.gitignore b/extra/hcqfuzz/.gitignore
new file mode 100644
index 0000000000..566be7a830
--- /dev/null
+++ b/extra/hcqfuzz/.gitignore
@@ -0,0 +1 @@
+reports
\ No newline at end of file
diff --git a/extra/hcqfuzz/fuzzer.py b/extra/hcqfuzz/fuzzer.py
new file mode 100644
index 0000000000..bea12c2ff9
--- /dev/null
+++ b/extra/hcqfuzz/fuzzer.py
@@ -0,0 +1,72 @@
+import os, random, subprocess, shlex, datetime, time, signal
+from extra.hcqfuzz.tools import create_report, on_start_run, collect_tests, init_log, log
+from extra.hcqfuzz.spec import AMSpec
+
+def run_test(dev, test):
+  on_start_run(dev, test)
+
+  dev_env = dev.get_exec_state()
+  test_env, cmd, timeout = test.get_exec_state()
+  env = {**dev_env, **test_env}
+
+  if isinstance(cmd, str): cmd = shlex.split(cmd)
+  assert isinstance(cmd, list), "cmd must be list or str"
+
+  if env is None: env = os.environ.copy()
+  else:
+    env = {k: str(v) for k, v in env.items()}
+    env = {**os.environ, **env}
+
+  start_ts = datetime.datetime.now()
+  t0 = time.perf_counter()
+  log(f"[{start_ts:%Y-%m-%d %H:%M:%S}] running: {test.name()}: {' '.join(cmd)}", end="", flush=True)
+
+  proc = subprocess.Popen(cmd, env=env, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True)
+  try:
+    stdout, stderr = proc.communicate(timeout=timeout)
+    ret = proc.returncode
+  except KeyboardInterrupt:
+    print("\nExiting...", flush=True)
+    proc.send_signal(signal.SIGINT)
+    try: stdout, stderr = proc.communicate(timeout=5)
+    except subprocess.TimeoutExpired:
+      proc.kill()
+      stdout, stderr = proc.communicate()
+    raise
+  except subprocess.TimeoutExpired:
+    cur_time = datetime.datetime.now()
+    log(f"\r[{cur_time:%Y-%m-%d %H:%M:%S}] {test.name()} send SIGKILL", end="", flush=True)
+
+    proc.kill()
+    stdout, stderr = proc.communicate()
+    ret = -9
+
+  finish_time = datetime.datetime.now()
+  elapsed = time.perf_counter() - t0
+  if ret != 0:
+    log(f"\r[{finish_time:%Y-%m-%d %H:%M:%S}] {test.name()} failed with {ret} after {elapsed:.1f}s", flush=True)
+    create_report(dev, test, ret, stdout, stderr)
+  else:
+    log(f"\r[{finish_time:%Y-%m-%d %H:%M:%S}] {test.name()} exited {ret} after {elapsed:.1f}s", flush=True)
+
+if __name__ == "__main__":
+  init_log()
+  device_name = "AM"
+  dev = AMSpec()
+
+  start_seed = os.environ.get("SEED", 3332)
+  random.seed(start_seed)
+
+  log(f"Starting with seed {start_seed}")
+
+  test_set = collect_tests()
+  log(f"Found {len(test_set)} tests:")
+  for test in test_set: log(f" - {test.name()}")
+
+  while True:
+    seed = random.randint(0, 2**31)
+    test = random.choice(test_set)
+
+    dev.prepare(seed)
+    test.prepare(dev, seed)
+    run_test(dev, test)
diff --git a/extra/hcqfuzz/readme b/extra/hcqfuzz/readme
new file mode 100644
index 0000000000..d3176f453d
--- /dev/null
+++ b/extra/hcqfuzz/readme
@@ -0,0 +1,12 @@
+# Fuzzing Infra
+
+To add a new test, define a `TestSpec`-based class in a file in the `tests/` folder.
+
+You can choose which tests to load from which file:
+```bash
+RUN_FILES="hcq,allocator" python3 extra/hcqfuzz/fuzzer.py
+```
+Or skip tests from any file:
+```bash
+SKIP_FILES="allocator" python3 extra/hcqfuzz/fuzzer.py
+```
diff --git a/extra/hcqfuzz/spec.py b/extra/hcqfuzz/spec.py
new file mode 100644
index 0000000000..c8202174f8
--- /dev/null
+++ b/extra/hcqfuzz/spec.py
@@ -0,0 +1,42 @@
+import os, random
+
+class TestSpec:
+  def prepare(self, device, seed):
+    raise NotImplementedError("prepare must be implemented in the derived class")
+  def get_exec_state(self):
+    raise NotImplementedError("get_exec_state must be implemented in the derived class")
+  def name(self): return self.__class__.__name__
+
+class DeviceSpec:
+  def prepare(self, seed):
+    raise NotImplementedError("prepare must be implemented in the derived class")
+  def get_exec_state(self):
+    raise NotImplementedError("get_exec_state must be implemented in the derived class")
+  def name(self): return self.__class__.__name__
+
+class HCQSpec(DeviceSpec): pass
+class AMDSpec(HCQSpec):
+  def __init__(self):
+    assert os.path.exists('/sys/module/amdgpu'), "amdgpu module should be loaded"
+
+  def prepare(self, seed):
+    self.env = {
+      "AMD": 1,
+      "AMD_LLVM": 0
+    }
+
+  def get_exec_state(self): return self.env
+
+class AMSpec(AMDSpec):
+  def __init__(self):
+    assert not os.path.exists('/sys/module/amdgpu'), "amdgpu module should not be loaded"
+
+  def prepare(self, seed):
+    super().prepare(seed)
+
+    self.env = {
+      **self.env, # from AMDSpec
+      "AMD_SDMA_BIND": random.randint(0, 1),
+      "AMD_ALLOC_QUEUE_DEV_MEM": 0, # random.randint(0, 1) need to validate
+      "AMD_QUEUE_SIZE": 1 << random.randint(10, 26),
+    }
diff --git a/extra/hcqfuzz/tests/allocator.py b/extra/hcqfuzz/tests/allocator.py
new file mode 100644
index 0000000000..dd17064915
--- /dev/null
+++ b/extra/hcqfuzz/tests/allocator.py
@@ -0,0 +1,16 @@
+from extra.hcqfuzz.spec import TestSpec
+import random
+
+class TLSFAllocator(TestSpec):
+  def prepare(self, dev, seed):
+    random.seed(seed)
+
+    self.env = {
+        "SEED": seed,
+        "ITERS": random.randint(10000, 1000000),
+    }
+
+    self.cmd = "python3 test/external/external_fuzz_tlsf.py"
+    self.timeout = 60 * 60 # 60 minutes
+
+  def get_exec_state(self): return self.env, self.cmd, self.timeout
diff --git a/extra/hcqfuzz/tests/allreduce.py b/extra/hcqfuzz/tests/allreduce.py
new file mode 100644
index 0000000000..b741d82aad
--- /dev/null
+++ b/extra/hcqfuzz/tests/allreduce.py
@@ -0,0 +1,17 @@
+from extra.hcqfuzz.spec import TestSpec
+import random
+
+class RingAllreduce(TestSpec):
+  def prepare(self, dev, seed):
+    random.seed(seed)
+
+    self.env = {
+      "GPUS": random.choice([2, 3, 4, 5, 6]),
+      "ITERS": random.randint(10, 1000),
+      "DEBUG": 2,
+    }
+
+    self.cmd = "python3 test/external/external_benchmark_multitensor_allreduce.py"
+    self.timeout = 10 * 60 # 10 minutes
+
+  def get_exec_state(self): return self.env, self.cmd, self.timeout
diff --git a/extra/hcqfuzz/tests/bert.py b/extra/hcqfuzz/tests/bert.py
new file mode 100644
index 0000000000..331d908cf1
--- /dev/null
+++ b/extra/hcqfuzz/tests/bert.py
@@ -0,0 +1,83 @@
+from extra.hcqfuzz.spec import TestSpec
+import random
+
+bert_train_params = {
+  "DEFAULT_FLOAT": "HALF",
+  "SUM_DTYPE": "HALF",
+  "GPUS": 6,
+  "BS": 96,
+  "EVAL_BS": 96,
+  "FUSE_ARANGE": 1,
+  "FUSE_ARANGE_UINT": 0,
+  "BASEDIR": "/raid/datasets/wiki",
+}
+
+class TrainBert(TestSpec):
+  def prepare(self, dev, seed):
+    random.seed(seed)
+
+    self.env = {
+      **bert_train_params,
+      "IGNORE_BEAM_CACHE": 1,
+      "BEAM": 5,
+      "BEAM_UOPS_MAX": 10000,
+      "BEAM_UPCAST_MAX": 256,
+      "BEAM_LOCAL_MAX": 1024,
+      "BEAM_MIN_PROGRESS": 5,
+      "IGNORE_JIT_FIRST_BEAM": 1,
+      "LOGMLPERF": 0,
+      "SEED": seed,
+    }
+
+    self.cmd = "python3 examples/mlperf/model_train.py"
+    self.timeout = 7 * 60 * 60 # 7 hours
+
+  def get_exec_state(self): return self.env, self.cmd, self.timeout
+
+class TrainBertShort(TestSpec):
+  def prepare(self, dev, seed):
+    random.seed(seed)
+
+    self.env = {
+      **bert_train_params,
+      "IGNORE_BEAM_CACHE": 1,
+      "BEAM": 5,
+      "BEAM_UOPS_MAX": 10000,
+      "BEAM_UPCAST_MAX": 256,
+      "BEAM_LOCAL_MAX": 1024,
+      "BEAM_MIN_PROGRESS": 5,
+      "IGNORE_JIT_FIRST_BEAM": 1,
+      "SEED": seed,
+      "BENCHMARK": 4096,
+      "JIT": 2
+    }
+
+    self.cmd = "python3 examples/mlperf/model_train.py"
+    self.timeout = 2 * 60 * 60 # 2 hours
+
+  def get_exec_state(self): return self.env, self.cmd, self.timeout
+
+class BertBeam(TestSpec):
+  def prepare(self, dev, seed):
+    random.seed(seed)
+
+    self.env = {
+      **bert_train_params,
+      "IGNORE_BEAM_CACHE": 1,
+      "BEAM": random.choice([1, 2, 3, 4, 5]),
+      "BEAM_UOPS_MAX": 10000,
+      "BEAM_UPCAST_MAX": 256,
+      "BEAM_LOCAL_MAX": 1024,
+      "BEAM_MIN_PROGRESS": 5,
+      "IGNORE_JIT_FIRST_BEAM": 1,
+      "SEED": seed,
+      "RESET_STEP": 1,
+      "BENCHMARK": 10,
+      "BERT_LAYERS": 2,
+      "SEED": seed,
+    }
+
+    self.cmd = "python3 examples/mlperf/model_train.py"
+    self.timeout = 1 * 60 * 60 # 1 hour
+
+  def get_exec_state(self): return self.env, self.cmd, self.timeout
diff --git a/extra/hcqfuzz/tests/hcq.py b/extra/hcqfuzz/tests/hcq.py
new file mode 100644
index 0000000000..77eaef660d
--- /dev/null
+++ b/extra/hcqfuzz/tests/hcq.py
@@ -0,0 +1,35 @@
+from extra.hcqfuzz.spec import TestSpec
+import random
+
+class HCQSignalFuzzer(TestSpec):
+  def prepare(self, dev, seed):
+    random.seed(seed)
+
+    self.env = {
+      "GPUS": random.choice([2, 3, 4, 5, 6]),
+      "ITERS": random.randint(1000000, 10000000),
+      "SEED": seed,
+    }
+
+    self.cmd = "python3 test/external/external_fuzz_hcq_signals.py"
+    self.timeout = 30 * 60 # 30 minutes
+
+  def get_exec_state(self): return self.env, self.cmd, self.timeout
+
+class HCQGraphFuzzer(TestSpec):
+  def prepare(self, dev, seed):
+    random.seed(seed)
+
+    self.env = {
+      "FUZZ_GRAPH_SPLIT_RUNS": random.randint(48, 64),
+      "FUZZ_GRAPH_MAX_SPLITS": random.randint(4, 16),
+      "FUZZ_GRAPH_SPLIT_RETRY_RUNS": random.randint(4, 8),
+      "MAX_KERNELS": random.randint(32, 512),
+      "MAX_DEVICES": random.choice([2, 3, 4, 5, 6]),
+      "ITERS": random.randint(100, 1000),
+    }
+
+    self.cmd = "python3 test/external/fuzz_graph.py"
+    self.timeout = 60 * 60 # 60 minutes
+
+  def get_exec_state(self): return self.env, self.cmd, self.timeout
diff --git a/extra/hcqfuzz/tests/resnet.py b/extra/hcqfuzz/tests/resnet.py
new file mode 100644
index 0000000000..0009219db9
--- /dev/null
+++ b/extra/hcqfuzz/tests/resnet.py
@@ -0,0 +1,66 @@
+from extra.hcqfuzz.spec import TestSpec
+import random
+
+resnet_train_params = {
+  "DEFAULT_FLOAT": "HALF",
+  "SUM_DTYPE": "HALF",
+  "GPUS": 6,
+  "BS": 1536,
+  "EVAL_BS": 192,
+  "TRAIN_BEAM": 4,
+  "IGNORE_JIT_FIRST_BEAM": 1,
+  "BEAM_UOPS_MAX": 2000,
+  "BEAM_UPCAST_MAX": 96,
+  "BEAM_LOCAL_MAX": 1024,
+  "BEAM_MIN_PROGRESS": 5,
+  "BEAM_PADTO": 0,
+  "EVAL_START_EPOCH": 3,
+  "EVAL_FREQ": 4
+}
+
+class TrainResnet(TestSpec):
+  def prepare(self, dev, seed):
+    random.seed(seed)
+
+    self.env = {
+      **resnet_train_params,
+      "IGNORE_BEAM_CACHE": 1,
+      "SEED": seed,
+    }
+
+    self.cmd = "python3 examples/mlperf/model_train.py"
+    self.timeout = 4 * 60 * 60 # 7 hours
+
+  def get_exec_state(self): return self.env, self.cmd, self.timeout
+
+class TrainResnetShort(TestSpec):
+  def prepare(self, dev, seed):
+    random.seed(seed)
+
+    self.env = {
+      **resnet_train_params,
+      "SEED": seed,
+      "BENCHMARK": 4096,
+      "JIT": 2,
+    }
+
+    self.cmd = "python3 examples/mlperf/model_train.py"
+    self.timeout = 2 * 60 * 60 # 2 hours
+
+  def get_exec_state(self): return self.env, self.cmd, self.timeout
+
+class ResnetBeam(TestSpec):
+  def prepare(self, dev, seed):
+    random.seed(seed)
+
+    self.env = {
+      **resnet_train_params,
+      "IGNORE_BEAM_CACHE": 1,
+      "BENCHMARK": 10,
+      "SEED": seed,
+    }
+
+    self.cmd = "python3 examples/mlperf/model_train.py"
+    self.timeout = 1 * 60 * 60 # 1 hour
+
+  def get_exec_state(self): return self.env, self.cmd, self.timeout
diff --git a/extra/hcqfuzz/tools.py b/extra/hcqfuzz/tools.py
new file mode 100644
index 0000000000..2f58528136
--- /dev/null
+++ b/extra/hcqfuzz/tools.py
@@ -0,0 +1,76 @@
+import pickle, datetime, os, tempfile, subprocess, zipfile, importlib.util
+from extra.hcqfuzz.spec import TestSpec
+from tinygrad.helpers import getenv
+
+BASE_DIR = os.path.dirname(os.path.abspath(__file__))
+TEST_DIR = os.path.join(BASE_DIR, "tests")
+REPORTS_DIR = os.path.join(BASE_DIR, "reports")
+
+def collect_tests():
+  run_files = getenv("RUN_FILES", "").split(",")
+  skip_tests = getenv("SKIP_FILES", "").split(",")
+
+  tests = []
+  for filename in os.listdir(TEST_DIR):
+    if filename.endswith(".py") and not filename.startswith("__"):
+      if run_files and filename[:-3] not in run_files: continue
+      if skip_tests and filename[:-3] in skip_tests: continue
+
+      filepath = os.path.join(TEST_DIR, filename)
+      module_name = f"tests.{filename[:-3]}"
+      module = importlib.import_module(module_name)
+      for attr_name in dir(module):
+        attr = getattr(module, attr_name)
+        if isinstance(attr, type) and issubclass(attr, TestSpec) and attr is not TestSpec:
+          tests.append(attr())
+  return tests
+
+def on_start_run(dev, test):
+  os.makedirs(REPORTS_DIR, exist_ok=True)
+  pickle.dump((dev, test), open(f"{REPORTS_DIR}/last_launch.pkl", "wb"))
+
+def create_report(dev, test, result, stdout, stderr):
+  os.makedirs(REPORTS_DIR, exist_ok=True)
+
+  timestamp = datetime.datetime.now().strftime("%Y%m%d_%H%M%S")
+  report_name = f"{timestamp}_{test.name()}_report"
+  report_path = os.path.join(REPORTS_DIR, report_name)
+
+  os.makedirs(report_path, exist_ok=False)
+
+  pickle_path = os.path.join(report_path, "repro.pkl")
+  with open(pickle_path, "wb") as f: pickle.dump((dev, test), f)
+
+  stdout_path = os.path.join(report_path, "stdout.txt")
+  with open(stdout_path, "w") as f: f.write(stdout)
+
+  stderr_path = os.path.join(report_path, "stderr.txt")
+  with open(stderr_path, "w") as f: f.write(stderr)
+
+  dmesg_path = os.path.join(report_path, "dmesg.txt")
+  dmesg_output = subprocess.check_output(["sudo", "dmesg", "--ctime", "--color=never"], text=True)
+  with open(dmesg_path, "w") as f: f.write(dmesg_output)
+
+  summary_path = os.path.join(report_path, "summary.txt")
+  with open(summary_path, "w") as f:
+    f.write(f"Test: {test.name()}\n")
+    f.write(f"Dev params: {vars(dev)}\n")
+    f.write(f"Test params: {vars(test)}\n")
+    f.write(f"Exit Code: {result}\n")
+
+  print(f"Crash report saved to {report_path}")
+
+_log_file = None
+def init_log():
+  global _log_file
+  os.makedirs(REPORTS_DIR, exist_ok=True)
+
+  ts = datetime.datetime.now().strftime("%Y%m%d_%H%M%S")
+  name = f"log_{ts}.log"
+  _log_file = open(f"{REPORTS_DIR}/{name}", "a", buffering=1)
+
+def log(msg="", end="\n", flush=False):
+  global _log_file
+  _log_file.write(msg.replace("\r", "\n") + end)
+  if flush: _log_file.flush()
+  print(msg + " " * 60, end=end, flush=flush)
diff --git a/test/external/external_fuzz_hcq_signals.py b/test/external/external_fuzz_hcq_signals.py
index 2b88cbc00e..cc667c79f1 100644
--- a/test/external/external_fuzz_hcq_signals.py
+++ b/test/external/external_fuzz_hcq_signals.py
@@ -24,7 +24,7 @@ def main():
     dev.timeline_value += 1
 
     if sync:=random.randint(0, 10) < 3: dev.synchronize()
-    if DEBUG >= 2: print(f"{i}: {q_t.__name__} {dev.device_id} timeline {dev.timeline_value}, wait for {[d.device_id for d in wait_devs]}, {sync=}")
+    if DEBUG >= 2: print(f"{i}: {q_t} {dev.device_id} timeline {dev.timeline_value}, wait for {[d.device_id for d in wait_devs]}, {sync=}")
     elif i % 100 == 0: print(f"\rCompleted {i} iterations", end='')
 
 if __name__ == "__main__":
diff --git a/test/external/external_fuzz_tlsf.py b/test/external/external_fuzz_tlsf.py
index 50f2478a83..512ced0b59 100644
--- a/test/external/external_fuzz_tlsf.py
+++ b/test/external/external_fuzz_tlsf.py
@@ -1,6 +1,6 @@
 import random
 from typing import Dict, Optional
-
+from tinygrad.helpers import getenv
 from tinygrad.runtime.support.allocator import TLSFAllocator
 
 class AllocatorFuzzer:
@@ -62,7 +62,7 @@ class AllocatorFuzzer:
     return True
 
   def run(self):
-    for i in range(10000000):
+    for i in range(getenv("ITERS", 100000)):
       if (random.random() < self.alloc_probability or not self.allocations): self.random_alloc()
       else: self.random_free()
 
@@ -72,5 +72,8 @@ class AllocatorFuzzer:
     print("Fuzzing completed successfully!")
 
 if __name__ == "__main__":
+  SEED = getenv("SEED", 42)
+  random.seed(SEED)
+
   fuzzer = AllocatorFuzzer(1 << 30)
   fuzzer.run()
diff --git a/test/external/fuzz_graph.py b/test/external/fuzz_graph.py
index d3c6e314a5..7992e21778 100644
--- a/test/external/fuzz_graph.py
+++ b/test/external/fuzz_graph.py
@@ -121,7 +121,7 @@ if __name__ == "__main__":
   np.random.seed(SEED)
 
   next_graph_id = 0
-  while True:
+  for i in range(getenv("ITERS", 1000)):
     print("Running graph", next_graph_id)
     jis, all_buffers, input_buffers = gen_graph()
     fuzz_graph(jis, all_buffers, input_buffers)