Merge pull request cockroachdb#70028 from itsbilal/disk-full-stop-nod…

…e-21.1

[release-21.1] roachtest: Stop node in disk-full roachtest before restarting.

pkg/cmd/roachtest/disk_full.go

@@ -62,6 +62,12 @@ func registerDiskFull(r *testRegistry) {
 						return nil
 					}
 					t.l.Printf("starting %d when disk is full\n", n)
+					// Pebble treats "no space left on device" as a background error. Kill
+					// cockroach if it is still running. Note that this is to kill the
+					// node that was started prior to this for loop, before the ballast
+					// was created. Now that the disk is full, any subsequent node starts
+					// must fail with an error for this test to succeed.
+					_ = c.StopE(ctx, c.Node(n))
 					// We expect cockroach to die during startup, though it might get far
 					// enough along that the monitor detects the death.
 					m.ExpectDeath()