Use of an uninitialized variable

Defect 113947 (STATIC_C)
Checker UNINIT (subcategory none)
File: /src/mongo/stdx/thread.h
Function mongo::stdx::support::SigAltStackController::_uninstall() const
/src/mongo/stdx/thread.h, line: 88
Declaring variable "ss" without initializer.

            stack_t ss;

/src/mongo/stdx/thread.h, line: 90
Using uninitialized value "ss". Field "ss.ss_sp" is uninitialized when calling "sigaltstack".

            if (sigaltstack(&ss, nullptr)) {