When I do an S3 Refresh (after migrating to a new hardware), all datastores (also local datastores) become unavailable. I assume the Bad Requests may caused by the S3 Endpoint, however, one laggy S3 Refresh should not affect other datastores to be fully unavailable. Not sure how to debug this.
PBS v4.2.0

PBS v4.2.0
Code:
May 02 16:43:24 mypbs proxmox-backup-proxy[1148]: GET /api2/json/admin/datastore/backup/status: 400 Bad Request: [client [::ffff:10.0.0.11]:44146] Unable to acquire lock "/etc/proxmox-backup/.datastore.lck" - Interrupted system call (os error 4)
May 02 16:43:30 mypbs proxmox-backup-proxy[1148]: lookup_datastore failed - Unable to acquire lock "/etc/proxmox-backup/.datastore.lck" - Interrupted system call (os error 4)
May 02 16:43:31 mypbs proxmox-backup-proxy[1148]: GET /api2/json/admin/datastore/backup/status: 400 Bad Request: [client [::ffff:10.0.0.10]:35116] Unable to acquire lock "/etc/proxmox-backup/.datastore.lck" - Interrupted system call (os error 4)
May 02 16:43:33 mypbs proxmox-backup-proxy[1148]: GET /api2/json/admin/datastore/backup/status: 400 Bad Request: [client [::ffff:10.0.0.12]:60830] Unable to acquire lock "/etc/proxmox-backup/.datastore.lck" - Interrupted system call (os error 4)
May 02 16:43:36 mypbs proxmox-backup-proxy[1148]: GET /api2/json/admin/datastore/backup/status: 400 Bad Request: [client [::ffff:10.0.0.11]:41814] Unable to acquire lock "/etc/proxmox-backup/.datastore.lck" - Interrupted system call (os error 4)
May 02 16:43:40 mypbs proxmox-backup-proxy[1148]: lookup_datastore failed - Unable to acquire lock "/etc/proxmox-backup/.datastore.lck" - Interrupted system call (os error 4)
May 02 16:43:43 mypbs proxmox-backup-proxy[1148]: GET /api2/json/admin/datastore/backup/status: 400 Bad Request: [client [::ffff:10.0.0.10]:51108] Unable to acquire lock "/etc/proxmox-backup/.datastore.lck" - Interrupted system call (os error 4)
May 02 16:43:45 mypbs proxmox-backup-proxy[1148]: GET /api2/json/admin/datastore/backup/status: 400 Bad Request: [client [::ffff:10.0.0.12]:33134] Unable to acquire lock "/etc/proxmox-backup/.datastore.lck" - Interrupted system call (os error 4)
May 02 16:43:48 mypbs proxmox-backup-proxy[1148]: GET /api2/json/admin/datastore/backup/status: 400 Bad Request: [client [::ffff:10.0.0.11]:41346] Unable to acquire lock "/etc/proxmox-backup/.datastore.lck" - Interrupted system call (os error 4)
May 02 16:43:55 mypbs proxmox-backup-proxy[1148]: GET /api2/json/admin/datastore/backup/status: 400 Bad Request: [client [::ffff:10.0.0.10]:38446] Unable to acquire lock "/etc/proxmox-backup/.datastore.lck" - Interrupted system call (os error 4)
May 02 16:43:57 mypbs proxmox-backup-proxy[1148]: GET /api2/json/admin/datastore/backup/status: 400 Bad Request: [client [::ffff:10.0.0.12]:35800] Unable to acquire lock "/etc/proxmox-backup/.datastore.lck" - Interrupted system call (os error 4)
May 02 16:44:00 mypbs proxmox-backup-proxy[1148]: GET /api2/json/admin/datastore/backup/status: 400 Bad Request: [client [::ffff:10.0.0.11]:33982] Unable to acquire lock "/etc/proxmox-backup/.datastore.lck" - Interrupted system call (os error 4)
May 02 16:44:06 mypbs proxmox-backup-proxy[1148]: GET /api2/json/admin/datastore/backup/status: 400 Bad Request: [client [::ffff:10.0.0.10]:57522] Unable to acquire lock "/etc/proxmox-backup/.datastore.lck" - Interrupted system call (os error 4)
May 02 16:44:09 mypbs proxmox-backup-proxy[1148]: GET /api2/json/admin/datastore/backup/status: 400 Bad Request: [client [::ffff:10.0.0.12]:54378] Unable to acquire lock "/etc/proxmox-backup/.datastore.lck" - Interrupted system call (os error 4)
May 02 16:44:10 mypbs proxmox-backup-proxy[1148]: lookup_datastore failed - Unable to acquire lock "/etc/proxmox-backup/.datastore.lck" - Interrupted system call (os error 4)
May 02 16:44:11 mypbs proxmox-backup-proxy[1148]: GET /api2/json/admin/datastore/backup/status: 400 Bad Request: [client [::ffff:10.0.0.11]:41982] Unable to acquire lock "/etc/proxmox-backup/.datastore.lck" - Interrupted system call (os error 4)
May 02 16:44:18 mypbs proxmox-backup-proxy[1148]: GET /api2/json/admin/datastore/backup/status: 400 Bad Request: [client [::ffff:10.0.0.10]:47686] Unable to acquire lock "/etc/proxmox-backup/.datastore.lck" - Interrupted system call (os error 4)
May 02 16:44:20 mypbs proxmox-backup-proxy[1148]: GET /api2/json/admin/datastore/backup/status: 400 Bad Request: [client [::ffff:10.0.0.12]:54454] Unable to acquire lock "/etc/proxmox-backup/.datastore.lck" - Interrupted system call (os error 4)
May 02 16:44:20 mypbs proxmox-backup-proxy[1148]: lookup_datastore failed - Unable to acquire lock "/etc/proxmox-backup/.datastore.lck" - Interrupted system call (os error 4)
May 02 16:44:24 mypbs proxmox-backup-proxy[1148]: GET /api2/json/admin/datastore/backup/status: 400 Bad Request: [client [::ffff:10.0.0.11]:60940] Unable to acquire lock "/etc/proxmox-backup/.datastore.lck" - Interrupted system call (os error 4)
May 02 16:44:30 mypbs proxmox-backup-proxy[1148]: GET /api2/json/admin/datastore/backup/status: 400 Bad Request: [client [::ffff:10.0.0.10]:57078] Unable to acquire lock "/etc/proxmox-backup/.datastore.lck" - Interrupted system call (os error 4)
May 02 16:44:30 mypbs proxmox-backup-proxy[1148]: lookup_datastore failed - Unable to acquire lock "/etc/proxmox-backup/.datastore.lck" - Interrupted system call (os error 4)
May 02 16:44:32 mypbs proxmox-backup-proxy[1148]: GET /api2/json/admin/datastore/backup/status: 400 Bad Request: [client [::ffff:10.0.0.12]:45010] Unable to acquire lock "/etc/proxmox-backup/.datastore.lck" - Interrupted system call (os error 4)

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