Fatal Abort with Core Dump on Index Out of Bounds with randperm and Tensor Reshaping
Author: LiSsHhUuAaIiCreated Nov 26, 2025Updated Nov 26, 2025
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Summary
I encountered a fatal program termination with core dump when running a model that should normally throw a catchable IndexError for out-of-bounds indexing. The issue occurs in eager mode when using flow.randperm with tensor reshaping, but instead of raising a proper Python exception that can be handled, OneFlow terminates the entire process with Aborted (core dumped).
Code to reproduce bug
import oneflow as flow
import oneflow.nn as nn
class TestModel(flow.nn.Module):
def __init__(self):
super(TestModel, self).__init__()
def forward(self, x):
perm = flow.randperm(x.numel())
x = x.view(-1, 128)
return x[perm[:64]]
x = flow.randn(32, 128)
model = TestModel()
try:
# This should raise a catchable IndexError but instead aborts
result = model(x)
print("Success:", result)
except Exception as e:
print("Caught exception:", e)
print("Program continues normally...")
print("This line should be reachable but isn't due to abort")Error Logs
terminate called after throwing an instance of 'oneflow::Exception'
what(): Check failed: (nd_index[i] < dense_shape[i] && nd_index[i] >= -dense_shape[i]) IndexError: index 1495 is out of bounds for dimension 0 with size 32
...
...
Aborted (core dumped)System Information
- OS: Ubuntu 20.04.6 LTS
- OneFlow version: '1.0.0.dev20251101+cpu'
- Python version: Python 3.10.19
Source: Oneflow-Inc/oneflow