integrationtests: reduce parallel flakiness in syscall capture

2 files changed, 7 insertions, 2 deletions

diff --git a/integrationtests/cmd/ioworkload/scenario_dir.go b/integrationtests/cmd/ioworkload/scenario_dir.go
index 81421ec..7a78716 100644
--- a/integrationtests/cmd/ioworkload/scenario_dir.go
+++ b/integrationtests/cmd/ioworkload/scenario_dir.go
@@ -210,13 +210,15 @@ func dirChdirEnoent() error {
 // The syscall fails with EBADF, but ior captures the tracepoint on entry.
 func dirGetdentsEbadf() error {
 	buf := make([]byte, 4096)
-	// Retry a few times to reduce flakiness under high integration parallelism.
-	for i := 0; i < 5; i++ {
+	// Keep issuing the syscall for a short window so ior has enough time to
+	// attach under high parallel integration load.
+	for i := 0; i < 40; i++ {
 		_, _, errno := syscall.Syscall(syscall.SYS_GETDENTS64, uintptr(9999), uintptr(unsafe.Pointer(&buf[0])), uintptr(len(buf)))
 		runtime.KeepAlive(buf)
 		if errno == 0 {
 			return fmt.Errorf("expected EBADF, but getdents64 succeeded")
 		}
+		time.Sleep(25 * time.Millisecond)
 	}
 	return nil
 }
diff --git a/integrationtests/cmd/ioworkload/scenario_unlink.go b/integrationtests/cmd/ioworkload/scenario_unlink.go
index ec7c926..e2cba6c 100644
--- a/integrationtests/cmd/ioworkload/scenario_unlink.go
+++ b/integrationtests/cmd/ioworkload/scenario_unlink.go
@@ -5,6 +5,7 @@ import (
 	"path/filepath"
 	"runtime"
 	"syscall"
+	"time"
 	"unsafe"
 )
 
@@ -86,6 +87,8 @@ func unlinkRmdir() error {
 	if err := syscall.Mkdir(subDir, 0o755); err != nil {
 		return fmt.Errorf("mkdir: %w", err)
 	}
+	// Give ior a brief attach window before the one-shot rmdir syscall.
+	time.Sleep(300 * time.Millisecond)
 
 	pathBytes, err := syscall.BytePtrFromString(subDir)
 	if err != nil {