runtime: call unlockOSThread directly in Windows syscall functions Windows syscall functions (e.g. syscall.Syscall9) are defined as cgo_unsafe_args (because it takes the address of one argument and use that to access all arguments) which makes them ABI0. In some case we may need ABI wrappers for them. Because those functions have a large number of arguments, the wrapper can take a non-trivial amount of stack frame, causing nosplit overflow when inlining is disabled. The overflow call chain involves deferreturn. This CL changes a deferred call to unlockOSThread to a direct call. If the syscall functions panics, it is likely a fatal error anyway. Fixes #45698. Change-Id: I280be826644de1205f9c8f5efaa4ec5e1b4eebc1 Reviewed-on: https://go-review.googlesource.com/c/go/+/316650 Trust: Cherry Mui <cherryyz@google.com> Run-TryBot: Cherry Mui <cherryyz@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Michael Knyszek <mknyszek@google.com>
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