Comment 6 for bug 1968131

As invoked by the virt-stack we see:

Starting vTPM manufacturing as swtpm:swtpm @ Thu 07 Apr 2022 08:14:26 AM UTC
Successfully created RSA 2048 EK with handle 0x81010001.
  Invoking /usr/lib/x86_64-linux-gnu/swtpm/swtpm-localca --type ek --ek ab6f56f67e86f80c401e130c0650461fe635896717fac00f49ab113f191fdcc5bafa84e8a3960be40dbbb769a43fb4b25bb532c1404bfe601bd03da20ee9e62e494216dc86cbf76cd42eb4255e0e5d129ae5c9b0790aea2733d44d188c7d4706ea6584dceaa476071cc9a8937bb5dbf006b1ff38a591470f13f00e26d67c34b11f2b82767292c8e872c48a1151a1f4b94382c6d6b199f9af0cecb0fc59fd22982b08fae6b682a6dd0fa5dac7bd3154634aa7b7015f8082d3833c7e2c2a089d3f905d733fde4983d50c76493b39dfc854f69844d3f52848036e9c36cdb96067cb99bf4a49e1f734b8bad50524a090b3723006d4b5a9ba9552390f27edb8a411f9 --dir /var/lib/libvirt/swtpm/8908c397-e4dc-4e8c-a758-2436264111cc/tpm2 --logfile /var/log/swtpm/libvirt/qemu/t1-swtpm.log --vmid t1:8908c397-e4dc-4e8c-a758-2436264111cc --tpm-spec-family 2.0 --tpm-spec-level 0 --tpm-spec-revision 164 --tpm-manufacturer id:00001014 --tpm-model swtpm --tpm-version id:20191023 --tpm2 --configfile /etc/swtpm-localca.conf --optsfile /etc/swtpm-localca.options
Creating root CA and a local CA's signing key and issuer cert.
Could not create root-CA:Can't load ./.rnd into RNG
4037B2BDC77F0000:error:12000079:random number generator:RAND_load_file:Cannot open file:../crypto/rand/randfile.c:106:Filename=./.rnd
Cannot write random bytes:
4037B2BDC77F0000:error:12000079:random number generator:RAND_write_file:Cannot open file:../crypto/rand/randfile.c:240:Filename=./.rnd

Running the same to a test path works fine

$ /usr/lib/x86_64-linux-gnu/swtpm/swtpm-localca --type ek --ek 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 --dir /tmp/test/tpm2 --logfile /tmp/test/swtpm.log --vmid t1:8908c397-e4dc-4e8c-a758-2436264111cc --tpm-spec-family 2.0 --tpm-spec-level 0 --tpm-spec-revision 164 --tpm-manufacturer id:00001014 --tpm-model swtpm --tpm-version id:20191023 --tpm2 --configfile /etc/swtpm-localca.conf --optsfile /etc/swtpm-localca.options
$ echo $?
0