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Cherry Mui 443eb9757c runtime: get a better g0 stack bound in needm
Currently, when C calls into Go the first time, we grab an M
using needm, which sets m.g0's stack bounds using the SP. We don't
know how big the stack is, so we simply assume 32K. Previously,
when the Go function returns to C, we drop the M, and the next
time C calls into Go, we put a new stack bound on the g0 based on
the current SP. After CL 392854, we don't drop the M, and the next
time C calls into Go, we reuse the same g0, without recomputing
the stack bounds. If the C code uses quite a bit of stack space
before calling into Go, the SP may be well below the 32K stack
bound we assumed, so the runtime thinks the g0 stack overflows.

This CL makes needm get a more accurate stack bound from
pthread. (In some platforms this may still be a guess as we don't
know exactly where we are in the C stack), but it is probably
better than simply assuming 32K.

For #59294.

Change-Id: Ie52a8f931e0648d8753e4c1dbe45468b8748b527
Reviewed-on: https://go-review.googlesource.com/c/go/+/479915
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
2023-03-30 23:23:55 +00:00
.github doc: normalize proposal-process links 2023-03-29 22:00:27 +00:00
api net: mptcp: implement listenMPTCP 2023-03-29 22:12:20 +00:00
doc runtime: for deep stacks, print both the top 50 and bottom 50 frames 2023-03-21 19:14:14 +00:00
lib/time time/tzdata: generate zip constant during cmd/dist 2023-01-17 22:30:53 +00:00
misc runtime: get a better g0 stack bound in needm 2023-03-30 23:23:55 +00:00
src runtime: get a better g0 stack bound in needm 2023-03-30 23:23:55 +00:00
test cmd/compile: casts from slices to array pointers are known to be non-nil 2023-03-29 21:55:11 +00:00
.gitattributes all: treat all files as binary, but check in .bat with CRLF 2020-06-08 15:31:43 +00:00
.gitignore time/tzdata: generate zip constant during cmd/dist 2023-01-17 22:30:53 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +00:00
CONTRIBUTING.md doc: normalize proposal-process links 2023-03-29 22:00:27 +00:00
go.env cmd/go: introduce GOROOT/go.env and move proxy/sumdb config there 2023-01-17 23:10:39 +00:00
LICENSE
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README.md README: update from CC-BY-3.0 to CC-BY-4.0 2022-11-02 20:14:56 +00:00
SECURITY.md SECURITY.md: replace golang.org with go.dev 2022-04-26 19:59:47 +00:00

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