After the fix for JDK-8146905, printing of the current compile task in the hs_err file is broken:

Current CompileTask:
C2:
[error occurred during error reporting (printing current compile task), id 0xe0000000]

This is because VMError::report() now passes VMError::out/log to CompileTask::print_line_on_error() which does not have the outputStream::_stamp TimeStamp initialized. CompileTask::print_impl() then invokes TimeStamp::milliseconds() and we hit the "must not be clear" assert because the _counter is zero.