tinywisdom opened a new issue, #18268:
URL: https://github.com/apache/tvm/issues/18268
### Expected behavior
- Instantiating `TuneContext` with a `SearchStrategy` should either:
1. Provide a meaningful Python-side error (e.g., `TypeError: cannot
instantiate abstract class`), or
2. Require a concrete subclass to be used.
In either case, it should **not** crash with a segmentation fault.
### Actual behavior
- Directly calling `SearchStrategy()` segfaults via FFI into C++ when used
in `TuneContext`.
- Python receives no exception, only a hard crash.
### Environment
- **OS**: (Ubuntu 22.04.4 LTS (x86_64))
- **TVM version**: (release v0.21.0)
- **Python**: (3.10.16)
- **LLVM**: (17.0.6)
### Steps to reproduce
```
import tvm
from tvm.target import Target
from tvm.meta_schedule import TuneContext, SearchStrategy
from tvm.script import ir as I, relax as R
# A minimal Relax IRModule (identity)
@I.ir_module
class M:
@R.function
def main(x: R.Tensor((1,), "float32")) -> R.Tensor((1,), "float32"):
return x
# Abstract SearchStrategy() => FFI into C++ => segfault in some versions
ctx = TuneContext(
mod=M,
target=Target("llvm"),
search_strategy=SearchStrategy(), # ❌ abstract class instantiation
)
# Typically segfaults here or later during ctx.tune()
print(ctx)
```
### Error log
```
!!!!!!! TVM FFI encountered a Segfault !!!!!!!
File "<unknown>", in
__pyx_pw_3tvm_3ffi_4core_6Object_27__init_handle_by_constructor__(_object*,
_object* const*, long, _object*)
File "<unknown>", in __pyx_f_3tvm_3ffi_4core_FuncCall(void*, _object*,
TVMFFIAny*, int*) [clone .constprop.0]
File "<unknown>", in __pyx_f_3tvm_3ffi_4core_make_args(_object*,
TVMFFIAny*, _object*)
File "./signal/../sysdeps/unix/sysv/linux/x86_64/libc_sigaction.c", in
0x00007289e284251f
File "<unknown>", in tvm::ffi::(anonymous
namespace)::backtrace_handler(int)
File "<unknown>", in tvm::ffi::(anonymous namespace)::Traceback()
Segmentation fault (core dumped)
```
### Triage
* needs-triage
* bug
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