AnyValueTest.CorrectlyAccessesIntWhenCorrectType UBSAN failure: owncast of address 0x60300105d750 which does not point to an object of type 'Holder<const int>' Sep 27 00:01:03 0x60300105d750: note: object is of type 'torch::nn::AnyModule::Value::Holder<int>'

[ezyang]

In #26927 I turn on libtorch tests in our ASAN build. I subsequently get this UBSAN error

Sep 27 00:01:02 [ RUN      ] AnyValueTest.CorrectlyAccessesIntWhenCorrectType
Sep 27 00:01:03 /var/lib/jenkins/workspace/caffe2/../torch/csrc/api/include/torch/nn/modules/container/any.h:258:15: runtime error: downcast of address 0x60300105d750 which does not point to an object of type 'Holder<const int>'
Sep 27 00:01:03 0x60300105d750: note: object is of type 'torch::nn::AnyModule::Value::Holder<int>'
Sep 27 00:01:03  5a 02 00 43  e8 7c fd dd 92 55 00 00  e0 7c d7 e0 7a 7f 00 00  05 00 00 00 be be be be  00 00 00 00
Sep 27 00:01:03               ^~~~~~~~~~~~~~~~~~~~~~~
Sep 27 00:01:03               vptr for 'torch::nn::AnyModule::Value::Holder<int>'
Sep 27 00:01:03     #0 0x5592dd02fa81 in int const* torch::nn::AnyModule::Value::try_get<int const>() (/var/lib/jenkins/workspace/build/bin/test_api+0x8f6a81)
Sep 27 00:01:03     #1 0x5592dd003b28 in AnyValueTest_CorrectlyAccessesIntWhenCorrectType_Test::TestBody() (/var/lib/jenkins/workspace/build/bin/test_api+0x8cab28)
Sep 27 00:01:03     #2 0x5592dd81c51a in void testing::internal::HandleExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*) (/var/lib/jenkins/workspace/build/bin/test_api+0x10e351a)
Sep 27 00:01:03     #3 0x5592dd7cb00a in testing::Test::Run() (/var/lib/jenkins/workspace/build/bin/test_api+0x109200a)
Sep 27 00:01:03     #4 0x5592dd7cd952 in testing::TestInfo::Run() (/var/lib/jenkins/workspace/build/bin/test_api+0x1094952)
Sep 27 00:01:03     #5 0x5592dd7cf87a in testing::TestCase::Run() (/var/lib/jenkins/workspace/build/bin/test_api+0x109687a)
Sep 27 00:01:03     #6 0x5592dd7f1c84 in testing::internal::UnitTestImpl::RunAllTests() (/var/lib/jenkins/workspace/build/bin/test_api+0x10b8c84)
Sep 27 00:01:03     #7 0x5592dd821c51 in bool testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(testing::internal::UnitTestImpl*, bool (testing::internal::UnitTestImpl::*)(), char const*) (/var/lib/jenkins/workspace/build/bin/test_api+0x10e8c51)
Sep 27 00:01:03     #8 0x5592dd7f0729 in testing::UnitTest::Run() (/var/lib/jenkins/workspace/build/bin/test_api+0x10b7729)
Sep 27 00:01:03     #9 0x5592dcf19527 in main (/var/lib/jenkins/workspace/build/bin/test_api+0x7e0527)
Sep 27 00:01:03     #10 0x7f7aae41c82f in __libc_start_main /build/glibc-LK5gWL/glibc-2.23/csu/../csu/libc-start.c:291
Sep 27 00:01:03     #11 0x5592dcf18ed8 in _start (/var/lib/jenkins/workspace/build/bin/test_api+0x7dfed8)
Sep 27 00:01:03 
Sep 27 00:01:03 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /var/lib/jenkins/workspace/caffe2/../torch/csrc/api/include/torch/nn/modules/container/any.h:258:15 in 

Looks like a const problem?

cc @yf225