all, I'm looping through a loop and reading a variable value which doesn't change in the loop. Getting "*** Error in `./HelloWorld.kexe': free(): invalid next size (fast): 0x0000000002521930 ***"

without any code snippets it's pretty hard to make any conclusion, and generally better approach would be minimize testcase and report issue in https://github.com/JetBrains/kotlin-native/issues

Nikolay: yeah, I have a snippet which reproduces it, but only when reading a certain sensitive file 😞

If you are reading file, try to use this function: https://github.com/JetBrains/kotlinconf-spinner/blob/7259a4f10488df76b0a4c9977bae2ff190a3bfc7/kotlin-native/samples/fullstack/common/src/main/kotlin/kommon/Kommon.kt#L11

Yeah, same problem. see https://gist.github.com/anonymous/273e1a4e01daece84e48523da9dc82a8