stackcount return *blank* stack.

[zhanweiw]

I run the command below in my Android device:

python stackcount -p 22119 /apex/com.android.runtime/lib64/bionic/libc.so:memset

There're many records without any stack information. I think even it is using FP to unwind the stack, at least the first frame stack with 'memset' should be shown. Any idea on this issue? Thanks in advance!

  b'memset'
  b'[unknown]'
    310

    311

    322

    433

  b'memset'
  b'MterpInvokeVirtual'
  b'mterp_op_invoke_virtual'
  b'art::interpreter::Execute(art::Thread*, art::CodeItemDataAccessor const&, art::ShadowFrame&, art::JValue, bool, bool) (.llvm.8678274965593772940)'
  b'artQuickToInterpreterBridge'
  b'art_quick_to_interpreter_bridge'
    564

  b'memset'
  b'[unknown]'
    652

    1059

    1205

    17162

    31876

[yezhengmao1]

I have the same issue. Did you fix this?