[LTP] [RFC PATCH] LTP Wrapper for Syzkaller reproducers

Cyril Hrubis chrubis@suse.cz
Wed Oct 9 16:54:16 CEST 2019

> I don't have prior experience with LTP tests, but from reading the
> code it looks reasonable to me.
> I assume that .needs_tmpdir = 1 ensures that each test runs in its own
> new temp dir, which is later removed.

Indeed, it's removed recursively by the test library.

> I've stared for a while at "rem / exec_time_start < 0.98" trying to
> understand what is that tst_timeout_remaining() returns that we want
> to kill that process when the ratio is < 0.98... provided that we
> convert 1 to float but not the other var. I failed to come up with the
> answer. I have potential answers for "<0.02" and ">0.98". But I assume
> you know what you are doing :)

The tst_timeout_remaining() returns remaining test timeout, so at test
start it returns something close to 300 seconds, since that is a default
for a LTP tests, so this would probably kill a process quite fast, if
I'm reading right, after a bit more than five seconds. I guess that this
is something intended for a quick v1 hack rather than for later use.

> Re tst_res(TINFO, "Timeout; killing reproducer"). Not sure how much it
> pollutes output on 3000 tests. If it is, it can make sense to remove
> it. Lots of tests run forever, killing it is not something of
> particular interest generally.

I guess so.

Cyril Hrubis

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