491c1e7e95
[This cherry-pick combines CL 527715, CL 527775, CL 527797, and CL 529216.] [This is a redo of CL 525455 with the test fixed on darwin by defining _XOPEN_SOURCE, and disabled with android, musl, and openbsd, which do not provide getcontext.] Since CL 495855, Ms are cached for C threads calling into Go, including the stack bounds of the system stack. Some C libraries (e.g., coroutine libraries) do manual stack management and may change stacks between calls to Go on the same thread. Changing the stack if there is more Go up the stack would be problematic. But if the calls are completely independent there is no particular reason for Go to care about the changing stack boundary. Thus, this CL allows the stack bounds to change in such cases. The primary downside here (besides additional complexity) is that normal systems that do not manipulate the stack may not notice unintentional stack corruption as quickly as before. Note that callbackUpdateSystemStack is written to be usable for the initial setup in needm as well as updating the stack in cgocallbackg. For #62440. For #62130. For #63209. Change-Id: I0fe0134f865932bbaff1fc0da377c35c013bd768 Reviewed-on: https://go-review.googlesource.com/c/go/+/527715 Run-TryBot: Michael Pratt <mpratt@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Auto-Submit: Michael Pratt <mpratt@google.com> Reviewed-by: Cherry Mui <cherryyz@google.com> (cherry picked from commit4f9fe6d509) (cherry picked from commite8ba0579e2) (cherry picked from commita843991fdd) (cherry picked from commitd110d7c42d) Reviewed-on: https://go-review.googlesource.com/c/go/+/530480 Auto-Submit: Dmitri Shuralyov <dmitshur@google.com> TryBot-Bypass: Michael Pratt <mpratt@google.com>
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