pkg/repro: fix invalid options minimization

Repro can generate Sandbox="namespace"/UseTmpDir=false.
This combination is broken for two reasons:
 - on second and subsequent executions of the program,
   it fails to create syz-tmp dir
 - with Procs>1, it fails right away, because all procs
   try to create syz-tmp dir

Don't generate such combination.

2 files changed, 12 insertions, 7 deletions

diff --git a/pkg/repro/repro.go b/pkg/repro/repro.go
index 154812967..0b4581ffb 100644
--- a/pkg/repro/repro.go
+++ b/pkg/repro/repro.go
@@ -792,7 +792,7 @@ var cSimplifies = append(progSimplifies, []Simplify{
 		return true
 	},
 	func(opts *csource.Options) bool {
-		if !opts.UseTmpDir {
+		if !opts.UseTmpDir || opts.Sandbox == "namespace" {
 			return false
 		}
 		opts.UseTmpDir = false
diff --git a/pkg/repro/repro_test.go b/pkg/repro/repro_test.go
index 3334db770..e56e176aa 100644
--- a/pkg/repro/repro_test.go
+++ b/pkg/repro/repro_test.go
@@ -78,13 +78,18 @@ func TestSimplifies(t *testing.T) {
 		WaitRepeat: true,
 		Repro:      true,
 	}
-	if err := opts.Check(); err != nil {
-		t.Fatalf("initial opts are invalid: %v", err)
-	}
-	for i, fn := range cSimplifies {
-		fn(&opts)
+	var check func(opts csource.Options, i int)
+	check = func(opts csource.Options, i int) {
 		if err := opts.Check(); err != nil {
-			t.Fatalf("opts %v are invalid: %v", i, err)
+			t.Fatalf("opts are invalid: %v", err)
+		}
+		if i == len(cSimplifies) {
+			return
+		}
+		check(opts, i+1)
+		if cSimplifies[i](&opts) {
+			check(opts, i+1)
 		}
 	}
+	check(opts, 0)
 }