tensor_cast asan flake

[GMNGeoffrey]

https://github.com/iree-org/iree/actions/runs/3492591056/jobs/5846535193 (which was a presubmit run testing other stuff, but should still be representative) had a failure in iree/tests/e2e/tensor_ops/tensor_cast.mlir.test only when run a bunch of times. The logs are not super helpful though:

2022-11-17T22:58:53.5635431Z  588/1085 Test  #136: iree/tests/e2e/tensor_ops/tensor_cast.mlir.test ..........................................................***Failed    2.99 sec
2022-11-17T22:58:53.5636685Z -- Testing: 1 tests, 1 workers --
2022-11-17T22:58:53.5673679Z FAIL: IREE :: e2e/tensor_ops/tensor_cast.mlir (1 of 1)
2022-11-17T22:58:53.5675536Z ******************** TEST 'IREE :: e2e/tensor_ops/tensor_cast.mlir' FAILED ********************
2022-11-17T22:58:53.5676066Z Script:
2022-11-17T22:58:53.5676456Z --
2022-11-17T22:58:53.5677664Z : 'RUN: at line 1';   iree-run-mlir --iree-hal-target-backends=llvm-cpu /work/tests/e2e/tensor_ops/tensor_cast.mlir | FileCheck /work/tests/e2e/tensor_ops/tensor_cast.mlir
2022-11-17T22:58:53.5679528Z : 'RUN: at line 2';   [[ $IREE_VMVX_DISABLE == 1 ]] || (iree-run-mlir --iree-hal-target-backends=vmvx /work/tests/e2e/tensor_ops/tensor_cast.mlir | FileCheck /work/tests/e2e/tensor_ops/tensor_cast.mlir)
2022-11-17T22:58:53.5681710Z : 'RUN: at line 3';   [[ $IREE_VULKAN_DISABLE == 1 ]] || (iree-run-mlir --iree-hal-target-backends=vulkan-spirv /work/tests/e2e/tensor_ops/tensor_cast.mlir | FileCheck /work/tests/e2e/tensor_ops/tensor_cast.mlir)
2022-11-17T22:58:53.5682646Z --
2022-11-17T22:58:53.5683006Z Exit Code: 1
2022-11-17T22:58:53.5683266Z 
2022-11-17T22:58:53.5683441Z Command Output (stderr):
2022-11-17T22:58:53.5683889Z --
2022-11-17T22:58:53.5684402Z Tracer caught signal 11: addr=0x4978 pc=0x55726567fa9a sp=0x7f88659f9d40
2022-11-17T22:58:53.5685027Z ==47855==LeakSanitizer has encountered a fatal error.
2022-11-17T22:58:53.5685788Z ==47855==HINT: For debugging, try setting environment variable LSAN_OPTIONS=verbosity=1:log_threads=1
2022-11-17T22:58:53.5687135Z ==47855==HINT: LeakSanitizer does not work under ptrace (strace, gdb, etc)
2022-11-17T22:58:53.5687562Z 
2022-11-17T22:58:53.5687757Z --
2022-11-17T22:58:53.5687958Z 
2022-11-17T22:58:53.5693532Z ********************
2022-11-17T22:58:53.5762529Z ********************
2022-11-17T22:58:53.5762959Z Failed Tests (1):
2022-11-17T22:58:53.5763535Z   IREE :: e2e/tensor_ops/tensor_cast.mlir
2022-11-17T22:58:53.5763856Z 
2022-11-17T22:58:53.5763867Z 
2022-11-17T22:58:53.5764044Z Testing Time: 2.82s

[bjacob]

I have installed exactly the same swiftshader by running build_tools/third_party/swiftshader/build_vk_swiftshader.sh, and i've been running this test a thousand times, but I can't reproduce.

One bit of information from the error message is that the addr=0x4978 looks abnormally small, as if it was a null pointer deref in disguise (disguised by some offset from a base pointer that happens to be null here). So I googled this a bit and found: google/sanitizers#1353

[bjacob]

Found google/sanitizers#1342 . Let's give a try to LSAN_OPTIONS=use_tls=0 , as in mqudsi/fish-shell@7718d44 ?