A manual test shows it's failing because:
$ sudo keyctl list %:.blacklist
Unparsable key: '%:.blacklist'
$ keyctl --version
keyctl from keyutils-1.5.6 (Built 2013-10-21)
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Still happens. 2022.01.31/trusty/linux-azure/4.15.0-1131.144~14.04.1
** Tags added: 4.15 sru-20220103 sru-20220131
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https://bugs.launchpad.net/bugs/1953340
Title:
kernel revocation lis
