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proc: fix bad cached goroutines after a call injection (#1926)

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Inserts a call to ClearAllGCache into stepInstructionOut so that cached
goroutine state is not inconsistent after an injected function call.\

Fixes #1925
This commit is contained in:
Alessandro Arzilli 2020-03-19 20:27:31 +01:00 committed by GitHub
parent c6de961be8
commit e1cfd72795
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 21 additions and 6 deletions
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1
pkg/proc/proc.go
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@ -330,6 +330,7 @@ func disassembleCurrentInstruction(p Process, thread Thread) ([]AsmInstruction,
// This function is used to step out of runtime.Breakpoint as well as
// runtime.debugCallV1.
func stepInstructionOut(dbp *Target, curthread Thread, fnname1, fnname2 string) error {
defer dbp.ClearAllGCache()
for {
if err := curthread.StepInstruction(); err != nil {
return err

23
pkg/proc/proc_test.go
View File

@ -4174,9 +4174,6 @@ func TestReadDeferArgs(t *testing.T) {
}
func TestIssue1374(t *testing.T) {
if runtime.GOARCH == "arm64" || runtime.GOARCH == "386" {
t.Skip(fmt.Errorf("%s does not support FunctionCall for now", runtime.GOARCH))
}
// Continue did not work when stopped at a breakpoint immediately after calling CallFunction.
protest.MustSupportFunctionCalls(t, testBackend)
withTestProcess("issue1374", t, func(p *proc.Target, fixture protest.Fixture) {
@ -4396,9 +4393,6 @@ func TestCallConcurrent(t *testing.T) {
if runtime.GOOS == "freebsd" {
t.Skip("test is not valid on FreeBSD")
}
if runtime.GOARCH == "arm64" || runtime.GOARCH == "386" {
t.Skip(fmt.Sprintf("%s does not support FunctionCall for now", runtime.GOARCH))
}
protest.MustSupportFunctionCalls(t, testBackend)
withTestProcess("teststepconcurrent", t, func(p *proc.Target, fixture protest.Fixture) {
@ -4748,3 +4742,20 @@ func TestBackwardNextDeferPanic(t *testing.T) {
{contReverseNext, 28},
})
}
func TestIssue1925(t *testing.T) {
// Calling a function should not leave cached goroutine information in an
// inconsistent state.
// In particular the stepInstructionOut function called at the end of a
// 'call' procedure should clean the G cache like every other function
// altering the state of the target process.
protest.MustSupportFunctionCalls(t, testBackend)
withTestProcess("testvariables2", t, func(p *proc.Target, fixture protest.Fixture) {
assertNoError(proc.Continue(p), t, "Continue()")
assertNoError(proc.EvalExpressionWithCalls(p, p.SelectedGoroutine(), "afunc(2)", normalLoadConfig, true), t, "Call")
t.Logf("%v\n", p.SelectedGoroutine().CurrentLoc)
if loc := p.SelectedGoroutine().CurrentLoc; loc.File != fixture.Source {
t.Errorf("wrong location for selected goroutine after call: %s:%d", loc.File, loc.Line)
}
})
}

3
pkg/proc/test/support.go
View File

@ -315,6 +315,9 @@ func MustSupportFunctionCalls(t *testing.T, testBackend string) {
if runtime.GOOS == "darwin" && os.Getenv("TRAVIS") == "true" {
t.Skip("function call injection tests are failing on macOS on Travis-CI (see #1802)")
}
if runtime.GOARCH == "arm64" || runtime.GOARCH == "386" {
t.Skip(fmt.Errorf("%s does not support FunctionCall for now", runtime.GOARCH))
}
}
// DefaultTestBackend changes the value of testBackend to be the default