Unexpected failure when running "stellar-core self-check"

[NickJH]

What version are you using?

Stellar-core version 15.3.0 from the docker image

What did you do?

I installed the stellar-core and stellar-core-state docker images following the guide at https://github.com/stellar/docker-stellar-core#single-node-local-network-with-monitoring. I used the supplied single.env file unaltered and ran the first two docker images as in the document. I didn't run the optional container.

I then went into the "single" container (stellar/stellar-core) and ran stellar-core self-check

What did you expect to see?

I am not sure but not failure.

What did you see instead?

root@proxmox103:/# stellar-core self-check
2021-02-23T14:32:08.567 [default INFO] Config from stellar-core.cfg
2021-02-23T14:32:08.568 [default INFO] Using QUORUM_SET: {
   "t" : 1,
   "v" : [ "GD5KD" ]
}

2021-02-23T14:32:08.573 GD5KD [Database INFO] Connecting to: postgresql://dbname=stellar user=postgres host=/postgresql-unix-sockets
2021-02-23T14:32:08.587 GD5KD [SCP INFO] LocalNode::LocalNode@GD5KD qSet: 3bdc92
2021-02-23T14:32:08.588 GD5KD [default INFO] Application destructing
2021-02-23T14:32:08.589 GD5KD [default INFO] Application destroyed
2021-02-23T14:32:08.590 GD5KD [default FATAL] Got an exception: unable to flock file: /data/buckets/stellar-core.lock (Resource temporarily unavailable). This can be caused by access rights issues or another stellar-core process already running
2021-02-23T14:32:08.590 GD5KD [default FATAL] Please report this bug along with this log file if this was not expected

Log file: single.log

FWIW, the command stellar-core test also gets a lot of failures:

test cases:   378 |   140 passed | 238 failed
assertions: 88722 | 88334 passed | 388 failed

2021-02-23T16:32:23.875 <test> [default ERROR] Nonzero test result with --rng-seed 18681

[NickJH]

Following on from this, /data/buckets is inside the "single" container.

/data is root:root 0755
/data/buckets is root:root 0700
/data/buckets/stellar-core.lock is root:root 0700

If I set everything to 0777 (OTT but I don't know what is needed), that test passes, but I now get:

root@proxmox103:/data# stellar-core self-check
2021-02-23T19:12:15.154 [default INFO] Config from stellar-core.cfg
2021-02-23T19:12:15.173 [default FATAL] Got an exception: No config file stellar-core.cfg found
2021-02-23T19:12:15.173 [default FATAL] Please report this bug along with this log file if this was not expected

but the file exists in /

Also I am now back to the first error and yet the permissions are as I set them.

If I then do a docker stop on both containers then a docker start, "single" won't stay up