intermittent error: "oid is undefined when calling $asn1->encode"

[autra]

With perl v5.22.1, using this test case: testcase.zip I have this error from time to time :

Failure: oid is undefined at test.pl line 21.

Line 21 is:

my $data = $asn1->encode(sig => $body,
    alg => {oid => sha512WithRSAEncryption()});

This is intermittent, so I use

for i in {1..10}; do                              
perl test.pl;      
done;

to easily reproduce.

Sergei Zhirikov, the maintainer of Uhura told me:

Further investigation led me to the conclusion that something inside Convert::ASN1 breaks with Perl hash randomization introduced in Perl 5.18 [...]. Fortunately, Perl allows to disable that randomization to mimic pre-5.18 behavior. By setting these environment variables: PERL_HASH_SEED=0x0 PERL_PERTURB_KEYS=0, I was able to run both the test script and the full uhura command without failures

I don't really know perl or its ecosystem, so I hope you'll have the info you need. Don't hesitate to ping me if you need more. Thanks!