Fix kcov enabling and disabling procedures.

- When the KCOV_ENABLE_TRACE ioctl is called with the trace kind KCOV_TRACE_PC,
  the kcov mode should be set to KCOV_*MODE*_TRACE_PC.
- When the owning task of kcov exits, the memory mapping should not be cleared
  so it can be used by other tasks.
- Add more tests (also tested on native Linux kcov).

PiperOrigin-RevId: 335202585

1 files changed, 1 insertions, 1 deletions

diff --git a/pkg/sentry/kernel/task.go b/pkg/sentry/kernel/task.go
index a436610c9..f796e0fa3 100644
--- a/pkg/sentry/kernel/task.go
+++ b/pkg/sentry/kernel/task.go
@@ -917,7 +917,7 @@ func (t *Task) SetKcov(k *Kcov) {
 // ResetKcov clears the kcov instance associated with t.
 func (t *Task) ResetKcov() {
 	if t.kcov != nil {
-		t.kcov.Reset()
+		t.kcov.OnTaskExit()
 		t.kcov = nil
 	}
 }