Unreliable test suites?

I'm doing some work on gdb and want to run the testsuites to confirm that I didn't mess it up.

The problem is that a number of them seem to be quite unreliable.  I've seen test runs where gdb.btrace/step.exp and/or stepi.exp have a pile of failures, but then when I rerun either just those tests, or the whole suite, they pass.

Since I haven't a clue how the reverse execution stuff works, I don't know if this is expected.  It seems strange.  I also don't know what to do about it if it's not supposed to be like that. For now, I'm just running things a couple of times, and if they pass once, I call it good enough.

	paul