[go] runtime: guard unexpected return pc gp.m dereference

[Gopher Robot (Gerrit)]

Gopher Robot submitted the change

Change information

Commit message:

runtime: guard unexpected return pc gp.m dereference

If stack scanning reaches here while scanning a waiting goroutine, gp.m
will be nil. We are going to crash anyway because the stack is corrupt,
but we still want to reach the print below for context rather than dying
with a SIGSEGV here.

For #64030.

Change-Id: I6a6a636c378669dc45972e1eb8e06401a0fed223

Reviewed-on: https://go-review.googlesource.com/c/go/+/726522

Auto-Submit: Michael Pratt <mpr...@google.com>

LUCI-TryBot-Result: Go LUCI <golang...@luci-project-accounts.iam.gserviceaccount.com>

Reviewed-by: Michael Knyszek <mkny...@google.com>

Files:

• M src/runtime/traceback.go

Change size: XS

Delta: 1 file changed, 1 insertion(+), 1 deletion(-)

Branch: refs/heads/master

Submit Requirements:

• Code-Review: +2 by Michael Knyszek
• TryBots-Pass: LUCI-TryBot-Result+1 by Go LUCI

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Gerrit

Gerrit-MessageType: merged

Gerrit-Project: go

Gerrit-Branch: master

Gerrit-Change-Id: I6a6a636c378669dc45972e1eb8e06401a0fed223

Gerrit-Change-Number: 726522

Gerrit-PatchSet: 2

Gerrit-Owner: Michael Pratt <mpr...@google.com>

Gerrit-Reviewer: Go LUCI <golang...@luci-project-accounts.iam.gserviceaccount.com>

Gerrit-Reviewer: Gopher Robot <go...@golang.org>

Gerrit-Reviewer: Michael Knyszek <mkny...@google.com>

Gerrit-Reviewer: Michael Pratt <mpr...@google.com>