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runtime: add always-preempt maymorestack hook

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This adds a maymorestack hook that forces a preemption at every
possible cooperative preemption point. This would have helped us catch
several recent preemption-related bugs earlier, including #47302,
 #47304, and #47441.

For #48297.

Change-Id: Ib82c973589c8a7223900e1842913b8591938fb9f
Reviewed-on: https://go-review.googlesource.com/c/go/+/359796
Trust: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Austin Clements 2021-09-15 17:14:21 -04:00
parent 3839b60014
commit 35c7234601
2 changed files with 37 additions and 0 deletions
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3
src/runtime/stack.go
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@ -144,6 +144,9 @@ const (
// Force a stack movement. Used for debugging.
// 0xfffffeed in hex.
stackForceMove = uintptrMask & -275
// stackPoisonMin is the lowest allowed stack poison value.
stackPoisonMin = uintptrMask & -4096
)
// Global pool of spans that have free stacks.