PG stuck at recovery

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Hi community

We have a new Ceph cluster deployment with 100 nodes. When we are draining an OSD host from the cluster, we see a small amount of PGs that cannot make any progress to the end. From the logs and metrics, it seems like the recovery progress is stuck (0 recovery ops for several days). Would like to get some ideas on this. Re-peering and OSD restart do resolve to mitigate the issue but we want to get to the root cause of it as draining and recovery happen frequently.

I have put some debugging information below. Any help is appreciated, thanks!

ceph -s
    pgs:     4210926/7380034104 objects misplaced (0.057%)
             41198 active+clean
             71    active+remapped+backfilling
             12    active+recovering

One of the stuck PG:
6.38f1   active+remapped+backfilling             [313,643,727]         313             [313,643,717]             313

PG query result:

ceph pg 6.38f1 query
{
    "snap_trimq": "[]",
    "snap_trimq_len": 0,
    "state": "active+remapped+backfilling",
    "epoch": 246856,
    "up": [
        313,
        643,
        727
    ],
    "acting": [
        313,
        643,
        717
    ],
    "backfill_targets": [
        "727"
    ],
    "acting_recovery_backfill": [
        "313",
        "643",
        "717",
        "727"
    ],
    "info": {
        "pgid": "6.38f1",
        "last_update": "212333'38916",
        "last_complete": "212333'38916",
        "log_tail": "80608'37589",
        "last_user_version": 38833,
        "last_backfill": "MAX",
        "purged_snaps": [],
        "history": {
            "epoch_created": 3726,
            "epoch_pool_created": 3279,
            "last_epoch_started": 243987,
            "last_interval_started": 243986,
            "last_epoch_clean": 220174,
            "last_interval_clean": 220173,
            "last_epoch_split": 3726,
            "last_epoch_marked_full": 0,
            "same_up_since": 238347,
            "same_interval_since": 243986,
            "same_primary_since": 3728,
            "last_scrub": "212333'38916",
            "last_scrub_stamp": "2024-01-29T13:43:10.654709+0000",
            "last_deep_scrub": "212333'38916",
            "last_deep_scrub_stamp": "2024-01-28T07:43:45.920198+0000",
            "last_clean_scrub_stamp": "2024-01-29T13:43:10.654709+0000",
            "prior_readable_until_ub": 0
        },
        "stats": {
            "version": "212333'38916",
            "reported_seq": 413425,
            "reported_epoch": 246856,
            "state": "active+remapped+backfilling",
            "last_fresh": "2024-02-05T21:14:40.838785+0000",
            "last_change": "2024-02-03T22:33:43.052272+0000",
            "last_active": "2024-02-05T21:14:40.838785+0000",
            "last_peered": "2024-02-05T21:14:40.838785+0000",
            "last_clean": "2024-02-03T04:26:35.168232+0000",
            "last_became_active": "2024-02-03T22:31:16.037823+0000",
            "last_became_peered": "2024-02-03T22:31:16.037823+0000",
            "last_unstale": "2024-02-05T21:14:40.838785+0000",
            "last_undegraded": "2024-02-05T21:14:40.838785+0000",
            "last_fullsized": "2024-02-05T21:14:40.838785+0000",
            "mapping_epoch": 243986,
            "log_start": "80608'37589",
            "ondisk_log_start": "80608'37589",
            "created": 3726,
            "last_epoch_clean": 220174,
            "parent": "0.0",
            "parent_split_bits": 14,
            "last_scrub": "212333'38916",
            "last_scrub_stamp": "2024-01-29T13:43:10.654709+0000",
            "last_deep_scrub": "212333'38916",
            "last_deep_scrub_stamp": "2024-01-28T07:43:45.920198+0000",
            "last_clean_scrub_stamp": "2024-01-29T13:43:10.654709+0000",
            "objects_scrubbed": 17743,
            "log_size": 1327,
            "log_dups_size": 3000,
            "ondisk_log_size": 1327,
            "stats_invalid": false,
            "dirty_stats_invalid": false,
            "omap_stats_invalid": false,
            "hitset_stats_invalid": false,
            "hitset_bytes_stats_invalid": false,
            "pin_stats_invalid": false,
            "manifest_stats_invalid": false,
            "snaptrimq_len": 0,
            "last_scrub_duration": 29,
            "scrub_schedule": "queued for deep scrub",
            "scrub_duration": 28.699844475999999,
            "objects_trimmed": 0,
            "snaptrim_duration": 0,
            "stat_sum": {
                "num_bytes": 67167022618,
                "num_objects": 17743,
                "num_object_clones": 0,
                "num_object_copies": 53229,
                "num_objects_missing_on_primary": 0,
                "num_objects_missing": 0,
                "num_objects_degraded": 0,
                "num_objects_misplaced": 12401,
                "num_objects_unfound": 0,
                "num_objects_dirty": 17743,
                "num_whiteouts": 0,
                "num_read": 16640,
                "num_read_kb": 30923655,
                "num_write": 55094,
                "num_write_kb": 71824558,
                "num_scrub_errors": 0,
                "num_shallow_scrub_errors": 0,
                "num_deep_scrub_errors": 0,
                "num_objects_recovered": 40746,
                "num_bytes_recovered": 154245233300,
                "num_keys_recovered": 0,
                "num_objects_omap": 0,
                "num_objects_hit_set_archive": 0,
                "num_bytes_hit_set_archive": 0,
                "num_flush": 0,
                "num_flush_kb": 0,
                "num_evict": 0,
                "num_evict_kb": 0,
                "num_promote": 0,
                "num_flush_mode_high": 0,
                "num_flush_mode_low": 0,
                "num_evict_mode_some": 0,
                "num_evict_mode_full": 0,
                "num_objects_pinned": 0,
                "num_legacy_snapsets": 0,
                "num_large_omap_objects": 0,
                "num_objects_manifest": 0,
                "num_omap_bytes": 0,
                "num_omap_keys": 0,
                "num_objects_repaired": 0
            },
            "up": [
                313,
                643,
                727
            ],
            "acting": [
                313,
                643,
                717
            ],
            "avail_no_missing": [
                "313",
                "643",
                "717"
            ],
            "object_location_counts": [
                {
                    "shards": "313,643,717",
                    "objects": 17743
                }
            ],
            "blocked_by": [],
            "up_primary": 313,
            "acting_primary": 313,
            "purged_snaps": []
        },
        "empty": 0,
        "dne": 0,
        "incomplete": 0,
        "last_epoch_started": 243987,
        "hit_set_history": {
            "current_last_update": "0'0",
            "history": []
        }
    },
    "peer_info": [
        {
            "peer": "643",
            "pgid": "6.38f1",
            "last_update": "212333'38916",
            "last_complete": "212333'38916",
            "log_tail": "80608'37589",
            "last_user_version": 38833,
            "last_backfill": "MAX",
            "purged_snaps": [],
            "history": {
                "epoch_created": 3726,
                "epoch_pool_created": 3279,
                "last_epoch_started": 243987,
                "last_interval_started": 243986,
                "last_epoch_clean": 220174,
                "last_interval_clean": 220173,
                "last_epoch_split": 3726,
                "last_epoch_marked_full": 0,
                "same_up_since": 238347,
                "same_interval_since": 243986,
                "same_primary_since": 3728,
                "last_scrub": "212333'38916",
                "last_scrub_stamp": "2024-01-29T13:43:10.654709+0000",
                "last_deep_scrub": "212333'38916",
                "last_deep_scrub_stamp": "2024-01-28T07:43:45.920198+0000",
                "last_clean_scrub_stamp": "2024-01-29T13:43:10.654709+0000",
                "prior_readable_until_ub": 0
            },
            "stats": {
                "version": "212331'38915",
                "reported_seq": 362849,
                "reported_epoch": 212333,
                "state": "active+clean+scrubbing+deep",
                "last_fresh": "2024-01-28T07:43:40.515729+0000",
                "last_change": "2024-01-28T06:20:14.969313+0000",
                "last_active": "2024-01-28T07:43:40.515729+0000",
                "last_peered": "2024-01-28T07:43:40.515729+0000",
                "last_clean": "2024-01-28T07:43:40.515729+0000",
                "last_became_active": "2024-01-23T10:01:07.710478+0000",
                "last_became_peered": "2024-01-23T10:01:07.710478+0000",
                "last_unstale": "2024-01-28T07:43:40.515729+0000",
                "last_undegraded": "2024-01-28T07:43:40.515729+0000",
                "last_fullsized": "2024-01-28T07:43:40.515729+0000",
                "mapping_epoch": 243986,
                "log_start": "80608'37589",
                "ondisk_log_start": "80608'37589",
                "created": 3726,
                "last_epoch_clean": 123203,
                "parent": "0.0",
                "parent_split_bits": 14,
                "last_scrub": "80609'38697",
                "last_scrub_stamp": "2024-01-09T20:27:40.795531+0000",
                "last_deep_scrub": "80609'38697",
                "last_deep_scrub_stamp": "2024-01-07T08:20:59.246940+0000",
                "last_clean_scrub_stamp": "2024-01-09T20:27:40.795531+0000",
                "objects_scrubbed": 17724,
                "log_size": 1326,
                "log_dups_size": 3000,
                "ondisk_log_size": 1326,
                "stats_invalid": false,
                "dirty_stats_invalid": false,
                "omap_stats_invalid": false,
                "hitset_stats_invalid": false,
                "hitset_bytes_stats_invalid": false,
                "pin_stats_invalid": false,
                "manifest_stats_invalid": false,
                "snaptrimq_len": 0,
                "last_scrub_duration": 29,
                "scrub_schedule": "deep scrubbing for 5005s",
                "scrub_duration": 28.446739284,
                "objects_trimmed": 0,
                "snaptrim_duration": 0,
                "stat_sum": {
                    "num_bytes": 67167022618,
                    "num_objects": 17743,
                    "num_object_clones": 0,
                    "num_object_copies": 53229,
                    "num_objects_missing_on_primary": 0,
                    "num_objects_missing": 0,
                    "num_objects_degraded": 0,
                    "num_objects_misplaced": 0,
                    "num_objects_unfound": 0,
                    "num_objects_dirty": 17743,
                    "num_whiteouts": 0,
                    "num_read": 16640,
                    "num_read_kb": 30923655,
                    "num_write": 55094,
                    "num_write_kb": 71824558,
                    "num_scrub_errors": 0,
                    "num_shallow_scrub_errors": 0,
                    "num_deep_scrub_errors": 0,
                    "num_objects_recovered": 35403,
                    "num_bytes_recovered": 134021819371,
                    "num_keys_recovered": 0,
                    "num_objects_omap": 0,
                    "num_objects_hit_set_archive": 0,
                    "num_bytes_hit_set_archive": 0,
                    "num_flush": 0,
                    "num_flush_kb": 0,
                    "num_evict": 0,
                    "num_evict_kb": 0,
                    "num_promote": 0,
                    "num_flush_mode_high": 0,
                    "num_flush_mode_low": 0,
                    "num_evict_mode_some": 0,
                    "num_evict_mode_full": 0,
                    "num_objects_pinned": 0,
                    "num_legacy_snapsets": 0,
                    "num_large_omap_objects": 0,
                    "num_objects_manifest": 0,
                    "num_omap_bytes": 0,
                    "num_omap_keys": 0,
                    "num_objects_repaired": 0
                },
                "up": [
                    313,
                    643,
                    727
                ],
                "acting": [
                    313,
                    643,
                    717
                ],
                "avail_no_missing": [],
                "object_location_counts": [],
                "blocked_by": [],
                "up_primary": 313,
                "acting_primary": 313,
                "purged_snaps": []
            },
            "empty": 0,
            "dne": 0,
            "incomplete": 0,
            "last_epoch_started": 243987,
            "hit_set_history": {
                "current_last_update": "0'0",
                "history": []
            }
        },
        {
            "peer": "717",
            "pgid": "6.38f1",
            "last_update": "212333'38916",
            "last_complete": "212333'38916",
            "log_tail": "80608'37589",
            "last_user_version": 0,
            "last_backfill": "MAX",
            "purged_snaps": [],
            "history": {
                "epoch_created": 3726,
                "epoch_pool_created": 3279,
                "last_epoch_started": 243987,
                "last_interval_started": 243986,
                "last_epoch_clean": 220174,
                "last_interval_clean": 220173,
                "last_epoch_split": 3726,
                "last_epoch_marked_full": 0,
                "same_up_since": 238347,
                "same_interval_since": 243986,
                "same_primary_since": 3728,
                "last_scrub": "212333'38916",
                "last_scrub_stamp": "2024-01-29T13:43:10.654709+0000",
                "last_deep_scrub": "212333'38916",
                "last_deep_scrub_stamp": "2024-01-28T07:43:45.920198+0000",
                "last_clean_scrub_stamp": "2024-01-29T13:43:10.654709+0000",
                "prior_readable_until_ub": 0
            },
            "stats": {
                "version": "212331'38915",
                "reported_seq": 362849,
                "reported_epoch": 212333,
                "state": "active+clean+scrubbing+deep",
                "last_fresh": "2024-01-28T07:43:40.515729+0000",
                "last_change": "2024-01-28T06:20:14.969313+0000",
                "last_active": "2024-01-28T07:43:40.515729+0000",
                "last_peered": "2024-01-28T07:43:40.515729+0000",
                "last_clean": "2024-01-28T07:43:40.515729+0000",
                "last_became_active": "2024-01-23T10:01:07.710478+0000",
                "last_became_peered": "2024-01-23T10:01:07.710478+0000",
                "last_unstale": "2024-01-28T07:43:40.515729+0000",
                "last_undegraded": "2024-01-28T07:43:40.515729+0000",
                "last_fullsized": "2024-01-28T07:43:40.515729+0000",
                "mapping_epoch": 243986,
                "log_start": "80608'37589",
                "ondisk_log_start": "80608'37589",
                "created": 3726,
                "last_epoch_clean": 123203,
                "parent": "0.0",
                "parent_split_bits": 14,
                "last_scrub": "80609'38697",
                "last_scrub_stamp": "2024-01-09T20:27:40.795531+0000",
                "last_deep_scrub": "80609'38697",
                "last_deep_scrub_stamp": "2024-01-07T08:20:59.246940+0000",
                "last_clean_scrub_stamp": "2024-01-09T20:27:40.795531+0000",
                "objects_scrubbed": 17724,
                "log_size": 1326,
                "log_dups_size": 3000,
                "ondisk_log_size": 1326,
                "stats_invalid": false,
                "dirty_stats_invalid": false,
                "omap_stats_invalid": false,
                "hitset_stats_invalid": false,
                "hitset_bytes_stats_invalid": false,
                "pin_stats_invalid": false,
                "manifest_stats_invalid": false,
                "snaptrimq_len": 0,
                "last_scrub_duration": 29,
                "scrub_schedule": "deep scrubbing for 5005s",
                "scrub_duration": 28.446739284,
                "objects_trimmed": 0,
                "snaptrim_duration": 0,
                "stat_sum": {
                    "num_bytes": 67167022618,
                    "num_objects": 17743,
                    "num_object_clones": 0,
                    "num_object_copies": 53229,
                    "num_objects_missing_on_primary": 0,
                    "num_objects_missing": 0,
                    "num_objects_degraded": 0,
                    "num_objects_misplaced": 0,
                    "num_objects_unfound": 0,
                    "num_objects_dirty": 17743,
                    "num_whiteouts": 0,
                    "num_read": 16640,
                    "num_read_kb": 30923655,
                    "num_write": 55094,
                    "num_write_kb": 71824558,
                    "num_scrub_errors": 0,
                    "num_shallow_scrub_errors": 0,
                    "num_deep_scrub_errors": 0,
                    "num_objects_recovered": 35403,
                    "num_bytes_recovered": 134021819371,
                    "num_keys_recovered": 0,
                    "num_objects_omap": 0,
                    "num_objects_hit_set_archive": 0,
                    "num_bytes_hit_set_archive": 0,
                    "num_flush": 0,
                    "num_flush_kb": 0,
                    "num_evict": 0,
                    "num_evict_kb": 0,
                    "num_promote": 0,
                    "num_flush_mode_high": 0,
                    "num_flush_mode_low": 0,
                    "num_evict_mode_some": 0,
                    "num_evict_mode_full": 0,
                    "num_objects_pinned": 0,
                    "num_legacy_snapsets": 0,
                    "num_large_omap_objects": 0,
                    "num_objects_manifest": 0,
                    "num_omap_bytes": 0,
                    "num_omap_keys": 0,
                    "num_objects_repaired": 0
                },
                "up": [
                    313,
                    643,
                    727
                ],
                "acting": [
                    313,
                    643,
                    717
                ],
                "avail_no_missing": [],
                "object_location_counts": [],
                "blocked_by": [],
                "up_primary": 313,
                "acting_primary": 313,
                "purged_snaps": []
            },
            "empty": 0,
            "dne": 0,
            "incomplete": 0,
            "last_epoch_started": 243987,
            "hit_set_history": {
                "current_last_update": "0'0",
                "history": []
            }
        },
        {
            "peer": "726",
            "pgid": "6.38f1",
            "last_update": "212333'38916",
            "last_complete": "212333'38916",
            "log_tail": "80608'37589",
            "last_user_version": 0,
            "last_backfill": "MIN",
            "purged_snaps": [],
            "history": {
                "epoch_created": 3726,
                "epoch_pool_created": 3279,
                "last_epoch_started": 238348,
                "last_interval_started": 238347,
                "last_epoch_clean": 220174,
                "last_interval_clean": 220173,
                "last_epoch_split": 3726,
                "last_epoch_marked_full": 0,
                "same_up_since": 238347,
                "same_interval_since": 243986,
                "same_primary_since": 3728,
                "last_scrub": "212333'38916",
                "last_scrub_stamp": "2024-01-29T13:43:10.654709+0000",
                "last_deep_scrub": "212333'38916",
                "last_deep_scrub_stamp": "2024-01-28T07:43:45.920198+0000",
                "last_clean_scrub_stamp": "2024-01-29T13:43:10.654709+0000",
                "prior_readable_until_ub": 11.834917336
            },
            "stats": {
                "version": "0'0",
                "reported_seq": 0,
                "reported_epoch": 0,
                "state": "unknown",
                "last_fresh": "0.000000",
                "last_change": "0.000000",
                "last_active": "0.000000",
                "last_peered": "0.000000",
                "last_clean": "0.000000",
                "last_became_active": "0.000000",
                "last_became_peered": "0.000000",
                "last_unstale": "0.000000",
                "last_undegraded": "0.000000",
                "last_fullsized": "0.000000",
                "mapping_epoch": 243986,
                "log_start": "0'0",
                "ondisk_log_start": "0'0",
                "created": 0,
                "last_epoch_clean": 0,
                "parent": "0.0",
                "parent_split_bits": 0,
                "last_scrub": "0'0",
                "last_scrub_stamp": "0.000000",
                "last_deep_scrub": "0'0",
                "last_deep_scrub_stamp": "0.000000",
                "last_clean_scrub_stamp": "0.000000",
                "objects_scrubbed": 0,
                "log_size": 0,
                "log_dups_size": 0,
                "ondisk_log_size": 0,
                "stats_invalid": false,
                "dirty_stats_invalid": false,
                "omap_stats_invalid": false,
                "hitset_stats_invalid": false,
                "hitset_bytes_stats_invalid": false,
                "pin_stats_invalid": false,
                "manifest_stats_invalid": false,
                "snaptrimq_len": 0,
                "last_scrub_duration": 0,
                "scrub_schedule": "--",
                "scrub_duration": 0,
                "objects_trimmed": 0,
                "snaptrim_duration": 0,
                "stat_sum": {
                    "num_bytes": 4194304,
                    "num_objects": 0,
                    "num_object_clones": 0,
                    "num_object_copies": 0,
                    "num_objects_missing_on_primary": 0,
                    "num_objects_missing": 17743,
                    "num_objects_degraded": 0,
                    "num_objects_misplaced": 0,
                    "num_objects_unfound": 0,
                    "num_objects_dirty": 0,
                    "num_whiteouts": 0,
                    "num_read": 0,
                    "num_read_kb": 0,
                    "num_write": 0,
                    "num_write_kb": 0,
                    "num_scrub_errors": 0,
                    "num_shallow_scrub_errors": 0,
                    "num_deep_scrub_errors": 0,
                    "num_objects_recovered": 0,
                    "num_bytes_recovered": 0,
                    "num_keys_recovered": 0,
                    "num_objects_omap": 0,
                    "num_objects_hit_set_archive": 0,
                    "num_bytes_hit_set_archive": 0,
                    "num_flush": 0,
                    "num_flush_kb": 0,
                    "num_evict": 0,
                    "num_evict_kb": 0,
                    "num_promote": 0,
                    "num_flush_mode_high": 0,
                    "num_flush_mode_low": 0,
                    "num_evict_mode_some": 0,
                    "num_evict_mode_full": 0,
                    "num_objects_pinned": 0,
                    "num_legacy_snapsets": 0,
                    "num_large_omap_objects": 0,
                    "num_objects_manifest": 0,
                    "num_omap_bytes": 0,
                    "num_omap_keys": 0,
                    "num_objects_repaired": 0
                },
                "up": [
                    313,
                    643,
                    727
                ],
                "acting": [
                    313,
                    643,
                    717
                ],
                "avail_no_missing": [],
                "object_location_counts": [],
                "blocked_by": [],
                "up_primary": 313,
                "acting_primary": 313,
                "purged_snaps": []
            },
            "empty": 0,
            "dne": 0,
            "incomplete": 1,
            "last_epoch_started": 238320,
            "hit_set_history": {
                "current_last_update": "0'0",
                "history": []
            }
        },
        {
            "peer": "727",
            "pgid": "6.38f1",
            "last_update": "212333'38916",
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}
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