Bug caused by thread_local variable?

[liuwenxin98]

The following error was encountered when using tcmalloc:
external/com_google_tcmalloc/tcmalloc/sampler.cc:55] bytes_until_sample_ == 0 @ 0x7f6283a9d79b 0x7f6283a81d17 0x7f6283a81f99 0x7f6283a01dec 0x7f6283a03004 0x7f62839d581b 0x7f6283b28c30 0x7f62834ecd96 Aborted (core dumped)

A very simple method of reproduction
Compiled using the bazel environment：
WORKSPACE:
git_repository( name = "com_google_tcmalloc", commit = "bb24fb0a8be3a6ef52888d247097d05976b8918e", remote = "https://github.com/google/tcmalloc.git", )

a.h:
#include <thread> thread_local int16_t var = -1;

b.h:
#include "a.h" class TestClass { public: TestClass(); ~TestClass() {} };

b.cc:
#include "b.h" TestClass::TestClass() { var = 1; }

BUILD:

cc_library(
    name = "var",
    srcs = [
        "a.h",
    ],
    deps = [
        "@com_google_tcmalloc//tcmalloc",
    ],
)

cc_binary(
    name = "libtest.so",
    srcs = [
        "b.cc",
        "b.h",
    ],
    deps = [
        ":var",
    ],
    linkshared = True,
)

test.cc:

#include <thread>

void test() {}

int main () {
  auto t = std::thread(test);
  t.join();
  return 0;
}

use bazel build :libtest.so and g++ -o test test.cc -pthread -L ./ -ltest and './test' get this error

May I ask if this is a bug or if there is a problem with my usage? I hope to receive your help.
Sincerely!