[ovs-dev] Possible Regression due to "ossfuzz: Break flow test target into two targets to speed up fuzzing."

Ilya Maximets i.maximets at samsung.com
Fri Oct 12 12:44:51 UTC 2018

> Hi,
> it seems that travis-ci is failing due to a testsuite regression introduced
> by 1adcbcee8f4c ("ossfuzz: Break flow test target into two targets to speed
> up fuzzing.").
> https://travis-ci.org/openvswitch/ovs/jobs/439811394

Hi Simon,

As it was already said, this is not the patch that produces the issue.
I'm able to reproduce '2649: ovn -- 3 HVs, 3 LS, 3 lports/LS, 1 LR'
test failure locally by restricting to use only one CPU core with taskset.
So, I bisected the issue and found that the fist patch that fails is:

	2e5cdb4b1392 ("OVN: add buffering support for ip packets").

Issue happens only if single core assigned:

	taskset -c 2   make check TESTSUITEFLAGS='2649'  #FAILS
	taskset -c 2-3 make check TESTSUITEFLAGS='2649'  #OK

As Travis has no much CPU resources it fails all the time.

I'm not much familiar with OVN code/tests, hope above information will
be useful for your investigation.

Best regards, Ilya Maximets.

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