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go/packages: do not return from goListDriver with goroutines still in flight

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This fixes a race found in
https://storage.googleapis.com/go-build-log/0ae93896/linux-amd64-race_e84a66dd.log.

Change-Id: I6b928e3b96378d458b48cf1f27341775a3dd0601
Reviewed-on: https://go-review.googlesource.com/c/tools/+/203897
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>
This commit is contained in:
Bryan C. Mills 2019-10-28 12:18:01 -04:00
parent c8a4b8d038
commit b394bd8bba
1 changed files with 7 additions and 2 deletions
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9
go/packages/golist.go
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@ -110,6 +110,7 @@ func goListDriver(cfg *Config, patterns ...string) (*driverResponse, error) {
sizeswg.Done()
}()
}
defer sizeswg.Wait()
// start fetching rootDirs
var info goInfo
@ -128,6 +129,10 @@ func goListDriver(cfg *Config, patterns ...string) (*driverResponse, error) {
return &info
}
// Ensure that we don't leak goroutines: Load is synchronous, so callers will
// not expect it to access the fields of cfg after the call returns.
defer getGoInfo()
// always pass getGoInfo to golistDriver
golistDriver := func(cfg *Config, patterns ...string) (*driverResponse, error) {
return golistDriver(cfg, getGoInfo, patterns...)
@ -734,9 +739,9 @@ func golistDriver(cfg *Config, rootsDirs func() *goInfo, words ...string) (*driv
// go list uses the following identifiers in ImportPath and Imports:
//
// "p" -- importable package or main (command)
// "q.test" -- q's test executable
// "q.test" -- q's test executable
// "p [q.test]" -- variant of p as built for q's test executable
// "q_test [q.test]" -- q's external test package
// "q_test [q.test]" -- q's external test package
//
// The packages p that are built differently for a test q.test
// are q itself, plus any helpers used by the external test q_test,