Segmentation fault for /llvm-test-suite/blob/main/Bitcode/Regression/fft/driver.cpp

[vishnuamd]

Used the below to run

https://github.com/llvm/llvm-test-suite/commits/main/Bitcode/Regression/fft/driver.cpp

Error occurred with recent clang version

18.0.0 (https://github.com/llvm/llvm-project.git 970569b6ccb071d32e67ed26e3b972141efd2c31)
Dated: 26-Jul-2023

lnt command

$ export ONLYTEST="--only-test Bitcode/Regression/fft/fft"
$ lnt runtest test-suite \
    --sandbox ${SANDBOX_PATH} \
    --cc clang \
    --cxx clang++ \
    --use-lit=${LLVM_LIT_PATH}/lit.py \
    --use-cmake=${CMAKE_PATH}/bin/cmake \
    --test-suite $TESTSUITE \
    --cmake-cache Release \
    --cxxflags="$CXXFLAGS" \
    --cflags="$CFLAGS" lnt_benchmarks_stage \
    --run-order=$RUNORDER \
    --build-threads $BTHREADS \
    --threads $RTHREADS \
    --exec-multisample=1  \
    --test-size large \
    --cmake-define=TEST_SUITE_RUN_TYPE=ref $ONLYTEST  \
    --cmake-define=TEST_SUITE_HOST_CC:STRING=clang \
    --cmake-define=RUNTIMELIMIT:NUMBER=3600

Snip from console output

2023-07-26 18:05:16 INFO: Execute: /home/vishnu/llvm-project/llvm/utils/lit/lit.py -v -j 8 /home/vishnu/halide/sandbox_3/test-2023-07-26_12-34-55/Bitcode/Regression/fft -o /home/vishnu/halide/sandbox_3/test-2023-07-26_12-34-55/outputfjepumvb.json
-- Testing: 1 tests, 1 workers --
FAIL: test-suite :: Bitcode/Regression/fft/fft.test (1 of 1)
******************** TEST 'test-suite :: Bitcode/Regression/fft/fft.test' FAILED ********************

/home/vishnu/halide/sandbox_3/test-2023-07-26_12-34-55/tools/timeit-target --limit-core 0 --limit-cpu 7200 --timeout 7200 --limit-file-size 104857600 --limit-rss-size 838860800 --redirect-input /dev/null --chdir /home/vishnu/halide/sandbox_3/test-2023-07-26_12-34-55/Bitcode/Regression/fft --summary /home/vishnu/halide/sandbox_3/test-2023-07-26_12-34-55/Bitcode/Regression/fft/Output/fft.test.time /home/vishnu/halide/sandbox_3/test-2023-07-26_12-34-55/Bitcode/Regression/fft/fft

/home/vishnu/halide/sandbox_3/test-2023-07-26_12-34-55/tools/timeit-target: error: child terminated by signal 11

********************
********************
Failed Tests (1):
  test-suite :: Bitcode/Regression/fft/fft.test


Testing Time: 0.11s
  Failed: 1
Import succeeded.
=======================================================================

Additional Info

1. Repository: https://github.com/llvm/llvm-test-suite.git

2. With default flags

3. Preliminary analysis:

   In the header file Bitcode/Regression/fft/halide_buffer.h
   filters array is defined with external function. The name is specified with the following format

   Format: FftConvolve{matrix}{extra text}xCHalide,
   {matrix}: Available matrix sizes are as follows:
   8x8, 16x16, 32x32, 64x64, 128x128, 256x256

   File: Bitcode/Regression/fft/driver.cpp
   Function: main
   Line: 53

    for (int i = 0; i < 24; i++) {
        filter f = filters[i];
        f.fn(bufs + 0,
             bufs + 1,
             bufs + 2); //<-- A
    }

In the above marked line A, when the filter ‘f’ with dimension 32,64,128,256 is accessed, segmentation fault is occurred.
The soruce code for the function pointing is not available, it is in byte code (*.bc).

According to the git log history, commit 58284af "[test-suite:Bitcode] Add fft (from Halide) as regression benchmark" is added in release/5.x and there is no change after wards.
Commit history: https://github.com/llvm/llvm-test-suite/commits/main/Bitcode/Regression/fft/driver.cpp