runtime: resolve checkdead panic by refining `startm` lock handling in caller context
This change addresses a `checkdead` panic caused by a race condition between
`sysmon->startm` and `checkdead` callers, due to prematurely releasing the
scheduler lock. The solution involves allowing a `startm` caller to acquire the
scheduler lock and call `startm` in this context. A new `lockheld` bool
argument is added to `startm`, which manages all lock and unlock calls within
the function. The`startIdle` function variable in `injectglist` is updated to
call `startm` with the lock held, ensuring proper lock handling in this
specific case. This refined lock handling resolves the observed race condition
issue.
Fixes #59600
Change-Id: I11663a15536c10c773fc2fde291d959099aa71be
Reviewed-on: https://go-review.googlesource.com/c/go/+/487316 Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Reviewed-by: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Michael Pratt <mpratt@google.com>