diff --git a/tinygrad_repo/tinygrad/runtime/ops_qcom.py b/tinygrad_repo/tinygrad/runtime/ops_qcom.py
index 155449c..9a6ddbf 100644
--- a/tinygrad_repo/tinygrad/runtime/ops_qcom.py
+++ b/tinygrad_repo/tinygrad/runtime/ops_qcom.py
@@ -16,8 +16,19 @@ if getenv("IOCTL"): import extra.qcom_gpu_driver.opencl_ioctl  # noqa: F401  # p
 
 BUFTYPE_BUF, BUFTYPE_TEX, BUFTYPE_IBO = 0, 1, 2
 
+# precompiled aarch64 machine code for the dcache_flush kernel below (dc cvac
+# loop + dsb sy). Shipping the bytes avoids a runtime clang subprocess whose
+# compile was getting killed by an msgq SIGUSR2 landing on the clang child's
+# recycled TID -> modeld crash. Regenerate if the kernel source changes:
+#   prg = to_program(...); print(prg.src[4].arg.hex())
+_DCACHE_FLUSH_AARCH64 = bytes.fromhex("3f040071cb000054287c4092207a0bd500000191080500f1a1ffff549f3f03d5c0035fd6")
+
 @functools.cache
 def dcache_flush():
+  # fast path: load shipped machine code, no compile at all (device is aarch64)
+  if os.uname().machine in ("aarch64", "arm64"):
+    try: return Device["CPU"].runtime("dcache_flush", _DCACHE_FLUSH_AARCH64)
+    except Exception: pass
   from tinygrad.uop.ops import UOp, Ops, KernelInfo
   from tinygrad.codegen import to_program
   buf, n = UOp.param(0, dtypes.uint8.ptr()), UOp.param(1, dtypes.uint8.ptr())
diff --git a/tinygrad_repo/tinygrad/runtime/support/compiler_cpu.py b/tinygrad_repo/tinygrad/runtime/support/compiler_cpu.py
index 2fc5ede..125d2e1 100644
--- a/tinygrad_repo/tinygrad/runtime/support/compiler_cpu.py
+++ b/tinygrad_repo/tinygrad/runtime/support/compiler_cpu.py
@@ -1,9 +1,13 @@
-import ctypes, subprocess
+import ctypes, subprocess, signal
 from tinygrad.device import Compiler
 from tinygrad.helpers import getenv, capstone_flatdump, DEBUG, unwrap
 from tinygrad.runtime.support.elf import jit_loader
 from tinygrad.runtime.autogen import llvm
 
+def _block_sigusr2():
+  try: signal.pthread_sigmask(signal.SIG_BLOCK, {signal.SIGUSR2})
+  except (ValueError, OSError): pass
+
 class ClangCompiler(Compiler):
   def __init__(self, arch:list[str], cachekey="compile_clang_jit"):
     assert len(arch) >= 2, f"invalid arch string: {','.join(arch)!r}, expected '<arch>,<cpu>,[<feats>]' (eg. 'x86_64,znver2')"
@@ -21,7 +25,8 @@ class ClangCompiler(Compiler):
     """Compile C source to ELF object file (before linking)."""
     # -fno-math-errno is required for __builtin_sqrt to become an instruction instead of a function call
     return subprocess.check_output([getenv("CC", 'clang'), '-c', '-x', 'c', '-O2', '-fPIC', '-ffreestanding', '-fno-math-errno', '-nostdlib',
-                                    '-fno-ident', f'--target={self.arch}-none-unknown-elf', *self.args, '-', '-o', '-'], input=src.encode('utf-8'))
+                                    '-fno-ident', f'--target={self.arch}-none-unknown-elf', *self.args, '-', '-o', '-'], input=src.encode('utf-8'),
+                                   preexec_fn=_block_sigusr2)
 
   def compile(self, src:str) -> bytes: return jit_loader(self.compile_to_obj(src))