PBS Garbage Collection fails on S3 (Contabo Object Storage) – missing `Name` field in response

O

Odai S.

New Member
Jan 5, 2026
3
0
1
Hello Proxmox Team,

I am experiencing a persistent Garbage Collection failure on Proxmox Backup Server when using an S3-compatible object storage backend.

Environment:
- Proxmox Backup Server version: proxmox-backup-server 4.1.1-1 running version: 4.1.1
- Datastore name: cloud-backup
- Storage backend: S3-compatible Object Storage
- Provider: Contabo Object Storage
- Garbage Collection: scheduled (daily)

Problem Description:
Garbage Collection fails consistently during phase2 when listing chunks from the S3 object store.

No configuration changes were made prior to the issue appearing.

---

Error observed:

2026-01-04T00:00:00+03:00: starting garbage collection on store cloud-backup
2026-01-04T00:00:00+03:00: task triggered by schedule 'daily'
2026-01-04T00:00:01+03:00: Access time update check successful, proceeding with GC.
2026-01-04T00:00:01+03:00: Using access time cutoff 1d 5m, minimum access time is 2026-01-02T20:55:00Z
2026-01-04T00:00:01+03:00: Start GC phase1 (mark used chunks)
2026-01-04T00:00:06+03:00: marked 1% (19 of 1835 index files)
2026-01-04T00:00:XX+03:00: ERROR: failed to list chunk in s3 object store:
failed to parse response body: custom: missing field Name

The garbage collection task stops at phase2 and does not complete.

---

Actions Taken:
- Verified S3 credentials and access permissions
- Confirmed no manual deletion or modification of objects
- Restarted Proxmox Backup Server services
- Retried garbage collection manually
- updated the PBS to the latest version and got the error below:


2026-01-05T15:30:04+03:00: starting garbage collection on store cloud-backup
2026-01-05T15:30:05+03:00: Access time update check successful, proceeding with GC.
2026-01-05T15:30:05+03:00: Using access time cutoff 1d 5m, minimum access time is 2026-01-04T12:25:04Z
2026-01-05T15:30:05+03:00: Start GC phase1 (mark used chunks)
2026-01-05T15:30:26+03:00: marked 1% (19 of 1835 index files)
2026-01-05T15:30:34+03:00: marked 2% (37 of 1835 index files)
2026-01-05T15:30:41+03:00: marked 3% (56 of 1835 index files)
2026-01-05T15:30:42+03:00: marked 4% (74 of 1835 index files)
2026-01-05T15:30:44+03:00: marked 5% (92 of 1835 index files)
2026-01-05T15:30:45+03:00: marked 6% (111 of 1835 index files)
2026-01-05T15:30:46+03:00: marked 7% (129 of 1835 index files)
2026-01-05T15:30:46+03:00: marked 8% (147 of 1835 index files)
2026-01-05T15:30:46+03:00: marked 9% (166 of 1835 index files)
2026-01-05T15:30:46+03:00: marked 10% (184 of 1835 index files)
2026-01-05T15:30:46+03:00: marked 11% (202 of 1835 index files)
2026-01-05T15:30:47+03:00: marked 12% (221 of 1835 index files)
2026-01-05T15:30:47+03:00: marked 13% (239 of 1835 index files)
2026-01-05T15:30:47+03:00: marked 14% (257 of 1835 index files)
2026-01-05T15:30:47+03:00: marked 15% (276 of 1835 index files)
2026-01-05T15:30:50+03:00: marked 16% (294 of 1835 index files)
2026-01-05T15:30:51+03:00: marked 17% (312 of 1835 index files)
2026-01-05T15:30:52+03:00: marked 18% (331 of 1835 index files)
2026-01-05T15:30:52+03:00: marked 19% (349 of 1835 index files)
2026-01-05T15:30:52+03:00: marked 20% (367 of 1835 index files)
2026-01-05T15:30:52+03:00: marked 21% (386 of 1835 index files)
2026-01-05T15:30:54+03:00: marked 22% (404 of 1835 index files)
2026-01-05T15:30:56+03:00: marked 23% (423 of 1835 index files)
2026-01-05T15:30:57+03:00: marked 24% (441 of 1835 index files)
2026-01-05T15:30:57+03:00: marked 25% (459 of 1835 index files)
2026-01-05T15:30:58+03:00: marked 26% (478 of 1835 index files)
2026-01-05T15:30:59+03:00: marked 27% (496 of 1835 index files)
2026-01-05T15:30:59+03:00: marked 28% (514 of 1835 index files)
2026-01-05T15:30:59+03:00: marked 29% (533 of 1835 index files)
2026-01-05T15:30:59+03:00: marked 30% (551 of 1835 index files)
2026-01-05T15:31:00+03:00: marked 31% (569 of 1835 index files)
2026-01-05T15:31:00+03:00: marked 32% (588 of 1835 index files)
2026-01-05T15:31:01+03:00: marked 33% (606 of 1835 index files)
2026-01-05T15:31:01+03:00: marked 34% (624 of 1835 index files)
2026-01-05T15:31:02+03:00: marked 35% (643 of 1835 index files)
2026-01-05T15:31:03+03:00: marked 36% (661 of 1835 index files)
2026-01-05T15:31:03+03:00: marked 37% (679 of 1835 index files)
2026-01-05T15:31:05+03:00: marked 38% (698 of 1835 index files)
2026-01-05T15:31:07+03:00: marked 39% (716 of 1835 index files)
2026-01-05T15:31:09+03:00: marked 40% (734 of 1835 index files)
2026-01-05T15:31:10+03:00: marked 41% (753 of 1835 index files)
2026-01-05T15:31:11+03:00: marked 42% (771 of 1835 index files)
2026-01-05T15:31:12+03:00: marked 43% (790 of 1835 index files)
2026-01-05T15:31:12+03:00: marked 44% (808 of 1835 index files)
2026-01-05T15:31:12+03:00: marked 45% (826 of 1835 index files)
2026-01-05T15:31:12+03:00: marked 46% (845 of 1835 index files)
2026-01-05T15:31:13+03:00: marked 47% (863 of 1835 index files)
2026-01-05T15:31:13+03:00: marked 48% (881 of 1835 index files)
2026-01-05T15:31:13+03:00: marked 49% (900 of 1835 index files)
2026-01-05T15:31:13+03:00: marked 50% (918 of 1835 index files)
2026-01-05T15:31:13+03:00: marked 51% (936 of 1835 index files)
2026-01-05T15:31:13+03:00: marked 52% (955 of 1835 index files)
2026-01-05T15:31:13+03:00: marked 53% (973 of 1835 index files)
2026-01-05T15:31:17+03:00: marked 54% (991 of 1835 index files)
2026-01-05T15:31:22+03:00: marked 55% (1010 of 1835 index files)
2026-01-05T15:31:25+03:00: marked 56% (1028 of 1835 index files)
2026-01-05T15:31:27+03:00: marked 57% (1046 of 1835 index files)
2026-01-05T15:31:27+03:00: marked 58% (1065 of 1835 index files)
2026-01-05T15:31:27+03:00: marked 59% (1083 of 1835 index files)
2026-01-05T15:31:28+03:00: marked 60% (1101 of 1835 index files)
2026-01-05T15:31:28+03:00: marked 61% (1120 of 1835 index files)
2026-01-05T15:31:28+03:00: marked 62% (1138 of 1835 index files)
2026-01-05T15:31:29+03:00: marked 63% (1157 of 1835 index files)
2026-01-05T15:31:29+03:00: marked 64% (1175 of 1835 index files)
2026-01-05T15:31:29+03:00: marked 65% (1193 of 1835 index files)
2026-01-05T15:31:30+03:00: marked 66% (1212 of 1835 index files)
2026-01-05T15:31:32+03:00: marked 67% (1230 of 1835 index files)
2026-01-05T15:31:34+03:00: marked 68% (1248 of 1835 index files)
2026-01-05T15:31:35+03:00: marked 69% (1267 of 1835 index files)
2026-01-05T15:31:35+03:00: marked 70% (1285 of 1835 index files)
2026-01-05T15:31:35+03:00: marked 71% (1303 of 1835 index files)
2026-01-05T15:31:36+03:00: marked 72% (1322 of 1835 index files)
2026-01-05T15:31:38+03:00: marked 73% (1340 of 1835 index files)
2026-01-05T15:31:40+03:00: marked 74% (1358 of 1835 index files)
2026-01-05T15:31:40+03:00: marked 75% (1377 of 1835 index files)
2026-01-05T15:31:40+03:00: marked 76% (1395 of 1835 index files)
2026-01-05T15:31:40+03:00: marked 77% (1413 of 1835 index files)
2026-01-05T15:31:49+03:00: marked 78% (1432 of 1835 index files)
2026-01-05T15:31:57+03:00: marked 79% (1450 of 1835 index files)
2026-01-05T15:32:04+03:00: marked 80% (1468 of 1835 index files)
2026-01-05T15:32:10+03:00: marked 81% (1487 of 1835 index files)
2026-01-05T15:32:14+03:00: marked 82% (1505 of 1835 index files)
2026-01-05T15:32:18+03:00: marked 83% (1524 of 1835 index files)
2026-01-05T15:32:20+03:00: marked 84% (1542 of 1835 index files)
2026-01-05T15:32:21+03:00: marked 85% (1560 of 1835 index files)
2026-01-05T15:32:22+03:00: marked 86% (1579 of 1835 index files)
2026-01-05T15:32:22+03:00: marked 87% (1597 of 1835 index files)
2026-01-05T15:32:23+03:00: marked 88% (1615 of 1835 index files)
2026-01-05T15:32:27+03:00: marked 89% (1634 of 1835 index files)
2026-01-05T15:32:30+03:00: marked 90% (1652 of 1835 index files)
2026-01-05T15:32:32+03:00: marked 91% (1670 of 1835 index files)
2026-01-05T15:32:32+03:00: marked 92% (1689 of 1835 index files)
2026-01-05T15:32:33+03:00: marked 93% (1707 of 1835 index files)
2026-01-05T15:32:33+03:00: marked 94% (1725 of 1835 index files)
2026-01-05T15:32:38+03:00: marked 95% (1744 of 1835 index files)
2026-01-05T15:32:39+03:00: marked 96% (1762 of 1835 index files)
2026-01-05T15:32:40+03:00: marked 97% (1780 of 1835 index files)
2026-01-05T15:32:43+03:00: marked 98% (1799 of 1835 index files)
2026-01-05T15:32:44+03:00: marked 99% (1817 of 1835 index files)
2026-01-05T15:32:45+03:00: marked 100% (1835 of 1835 index files)
2026-01-05T15:32:46+03:00: Start GC phase2 (sweep unused chunks)
2026-01-05T15:32:46+03:00: queued notification (id=10f4a17a-2d4b-42b5-b2fd-eef54aeb6069)
2026-01-05T15:32:46+03:00: TASK ERROR: failed to list chunk in s3 object store: failed to parse response body: custom: missing field `IsTruncated`

The issue persists.

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Thank you for your support.
 
So i consulted uncle chaty "GTP and he give this?
is this what is happening ???

This part:​


“send a patch to fix also the remaining parsing in case the isTruncated field is not present”
Click to expand...

Means:


  • Chris has already submitted a NEW patch
  • That patch tells PBS:

    “If IsTruncated is missing, don’t fail — just continue”
    Click to expand...

This patch is not yet released in a stable package
It’s currently in Proxmox’s development pipeline.
 
Yes, the patch still needs to undergo review before being applied and packaged.
 
Thanks for the confirmation, Chris.
Happy New Year, and appreciate your prompt response.
 
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