golang/go

runtime: deadlock while stopping the world (most recently openbsd/amd64)

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#62,541 opened on Sep 8, 2023

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NeedsInvestigationOS-OpenBSDcompiler/runtimehelp wanted

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Description

#!watchflakes
default <- log ~ `SIGQUIT` && log ~ `stopping the world`

Issue created automatically to collect these failures.

Example (log):

SIGQUIT: quit
PC=0x80b76f7 m=14 sigcode=0

eax    0x4
ebx    0x0
ecx    0x8407b00
edx    0x854aa80
edi    0xb09dfe7c
esi    0xf
ebp    0x3
...
	/tmp/workdir/go/src/runtime/proc.go:1262 +0xc7 fp=0x8438e1c sp=0x8438df4 pc=0x8087577
runtime.stopTheWorldGC(0xa)
	/tmp/workdir/go/src/runtime/proc.go:1310 +0x45 fp=0x8438e34 sp=0x8438e1c pc=0x8087705
runtime.StartTrace()
	/tmp/workdir/go/src/runtime/trace.go:284 +0x1c fp=0x8438e7c sp=0x8438e34 pc=0x80a432c
runtime/trace.Start({0x8237a2c, 0x847e270})
	/tmp/workdir/go/src/runtime/trace/trace.go:125 +0x75 fp=0x8438e98 sp=0x8438e7c pc=0x81105e5
runtime/trace_test.TestTraceFutileWakeup(0x85340f0)
	/tmp/workdir/go/src/runtime/trace/trace_test.go:510 +0xc5 fp=0x8438f98 sp=0x8438e98 pc=0x81b2315
testing.tRunner(0x85340f0, 0x8208078)

— watchflakes

Contributor guide

Research direction
Investigate the deadlock in stopTheWorld when called from StartTrace. Focus on openbsd/amd64 specifics. Look for lock ordering or missing unlock in the trace path. Check recent changes to runtime/pprof or trace.
Tech stack
go
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Needs investigation
Prerequisites
Goruntime internals
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
35