PgBackRest client_loop: send disconnect: Connection reset

List,

I am facing an Error : on a connection reset while PgBackRest is doing
backup process for DB server to Repo Server.

But the reissue of the pgbackrest backup command fails as follows...

"Unable to acquire lock on file '/tmp/pgbackrest/Repo-backup.lock':
Resource temporarily unavailable HINT: is another pgBackRest process
running?

After multiple attempts and during 8 to 10 minutes, the backup command
from RepoServer starts working again.. How to avoid /what is the exact
reason for "Resource temporarily unavailable"? HINT : Is another
PgBackRest process running ?

Please advise ..

On Connection reset then issuing backup command I get out puts as below.

######################################################################

[root(at)dbtest ~]# sudo -u postgres pgbackrest --stanza=Repo
--log-level-console=info backup
2024-08-29 16:38:13.922 P00 INFO: backup command begin 2.52.1: --delta
--exec-id=658924-527c843b --log-level-console=info --log-level-file=debug
--pg1-host=10.15.0.202 --pg1-host-user=enterprisedb
--pg1-path=/data/edb/as16/data --pg-version-force=16 --process-max=5
--repo1-block --repo1-bundle --repo1-cipher-pass=<redacted>
--repo1-cipher-type=aes-256-cbc --repo1-path=/data/DB_BKUPS
--repo1-retention-diff=2 --repo1-retention-full=2 --stanza=Repo --start-fast
WARN: no prior backup exists, incr backup has been changed to full
2024-08-29 16:38:16.745 P00 INFO: execute non-exclusive backup start:
backup begins after the requested immediate checkpoint completes
2024-08-29 16:38:18.003 P00 INFO: backup start archive =
00000001000000850000009A, lsn = 85/9A0000D8
2024-08-29 16:38:18.003 P00 INFO: check archive for prior segment
000000010000008500000099
WARN: resumable backup 20240829-105625F of same type exists -- invalid
files will be removed then the backup will resume
client_loop: send disconnect: Connection reset

[root(at)dbtest ~]# sudo -u postgres pgbackrest --stanza=Repo
--log-level-console=info backup
2024-08-29 18:45:06.630 P00 INFO: backup command begin 2.52.1: --delta
--exec-id=691718-6c37ff5c --log-level-console=info --log-level-file=debug
--pg1-host=10.15.0.202 --pg1-host-user=enterprisedb
--pg1-path=/data/edb/as16/data --pg-version-force=16 --process-max=5
--repo1-block --repo1-bundle --repo1-cipher-pass=<redacted>
--repo1-cipher-type=aes-256-cbc --repo1-path=/data/DB_BKUPS
--repo1-retention-diff=2 --repo1-retention-full=2 --stanza=Repo --start-fast
ERROR: [050]: unable to acquire lock on file
'/tmp/pgbackrest/Repo-backup.lock': Resource temporarily unavailable
HINT: is another pgBackRest process running?

2024-08-29 18:45:06.631 P00 INFO: backup command end: aborted with
exception [050]
[root(at)dbtest ~]# sudo -u postgres pgbackrest --stanza=Repo
--log-level-console=info backup
2024-08-29 18:45:14.531 P00 INFO: backup command begin 2.52.1: --delta
--exec-id=691730-06e11989 --log-level-console=info --log-level-file=debug
--pg1-host=10.15.0.202 --pg1-host-user=enterprisedb
--pg1-path=/data/edb/as16/data --pg-version-force=16 --process-max=5
--repo1-block --repo1-bundle --repo1-cipher-pass=<redacted>
--repo1-cipher-type=aes-256-cbc --repo1-path=/data/DB_BKUPS
--repo1-retention-diff=2 --repo1-retention-full=2 --stanza=Repo --start-fast
ERROR: [050]: unable to acquire lock on file
'/tmp/pgbackrest/Repo-backup.lock': Resource temporarily unavailable
HINT: is another pgBackRest process running?
2024-08-29 18:45:14.531 P00 INFO: backup command end: aborted with
exception [050]

###########################################################################
After 10 minutes or so I issued the command again as follows it starts
backing up as follows ?

2024-08-29 18:48:19.561 P00 INFO: backup command end: aborted with
exception [050]
[root(at)dbtest ~]# sudo -u postgres pgbackrest --stanza=Repo
--log-level-console=info backup
2024-08-29 18:52:33.834 P00 INFO: backup command begin 2.52.1: --delta
--exec-id=693517-4994fba1 --log-level-console=info --log-level-file=debug
--pg1-host=10.15.0.202 --pg1-host-user=enterprisedb
--pg1-path=/data/edb/as16/data --pg-version-force=16 --process-max=5
--repo1-block --repo1-bundle --repo1-cipher-pass=<redacted>
--repo1-cipher-type=aes-256-cbc --repo1-path=/data/DB_BKUPS_NGERSS
--repo1-retention-diff=2 --repo1-retention-full=2 --stanza=Repo --start-fast
WARN: no prior backup exists, incr backup has been changed to full
2024-08-29 18:52:36.813 P00 INFO: execute non-exclusive backup start:
backup begins after the requested immediate checkpoint completes
2024-08-29 18:52:37.788 P00 INFO: backup start archive =
000000010000008600000063, lsn = 86/63000028
2024-08-29 18:52:37.788 P00 INFO: check archive for prior segment
000000010000008600000062
WARN: resumable backup 20240829-105625F of same type exists -- invalid
files will be removed then the backup will resume

Thank you,
Krishane