mysqld DENIED audit messages for /proc/sys/kernel/random/boot_id (apparmor)

[falstaff]

It seems that mysqld tries to access /proc/sys/kernel/random/boot_id and is not allowed to:

May 18 20:56:21 quak kernel: [555114.509781] audit: type=1400 audit(1589828181.471:518548): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/sys/kernel/random/boot_id" pid=2209903 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=0 ouid=0

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: mysql-server 8.0.20-0ubuntu0.20.04.1
ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30
Uname: Linux 5.4.0-29-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
Date: Mon May 18 20:49:04 2020
Logs.var.log.daemon.log:

MySQLConf.etc.mysql.conf.d.mysql.cnf: [mysql]
MySQLConf.etc.mysql.conf.d.mysqld_safe_syslog.cnf:
 [mysqld_safe]
 syslog
MySQLConf.etc.mysql.conf.d.mysqldump.cnf:
 [mysqldump]
 quick
 quote-names
 max_allowed_packet = 16M
MySQLConf.etc.mysql.mysql.conf.d.mysqld_safe_syslog.cnf:
 [mysqld_safe]
 syslog
MySQLVarLibDirListing: False
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_CH.UTF-8
 SHELL=/bin/bash
SourcePackage: mysql-8.0
UpgradeStatus: Upgraded to focal on 2020-05-12 (6 days ago)

[falstaff (falstaff)]

As the log actually states, the problem was that another instance of mysqld was using the port:

Can't start server: Bind on TCP/IP port: Address already in use

I am still leaving this issue open as the appamore DENIED operation might be something which should be fixed in the apparmor profile.