Unable to create backup, panic: assignment to entry in nil map

I followed this guide https://cloudnative-pg.io/plugin-barman-cloud/docs/usage/ to create a backup, but immediately encountered this error. I tried deploying both version 0.6.0 and the latest main branch, but both resulted in this error. Could you help me identify the cause?

➜  umami git:(main) kubectl -n umami describe backup backup-example
Name:         backup-example
Namespace:    umami
Labels:       <none>
Annotations:  <none>
API Version:  postgresql.cnpg.io/v1
Kind:         Backup
Metadata:
  Creation Timestamp:  2025-09-17T15:52:13Z
  Generation:          1
  Resource Version:    93357031
  UID:                 f00d6637-465b-4d13-afa5-4a9320a14f91
Spec:
  Cluster:
    Name:  umami-pg-cluster
  Method:  plugin
  Plugin Configuration:
    Name:  barman-cloud.cloudnative-pg.io
Status:
  Error:  rpc error: code = Unknown desc = panic caught: assignment to entry in nil map

goroutine 354 [running]:
github.com/grpc-ecosystem/go-grpc-middleware/v2/interceptors/recovery.recoverFrom({0x2718080?, 0xc00002aab0?}, {0x1fe6fc0, 0x3a52170}, 0xc0005f67a7?)
  /go/pkg/mod/github.com/grpc-ecosystem/go-grpc-middleware/[email protected]/interceptors/recovery/interceptors.go:57 +0x65
github.com/grpc-ecosystem/go-grpc-middleware/v2/interceptors/recovery.UnaryServerInterceptor.func1.1()
  /go/pkg/mod/github.com/grpc-ecosystem/go-grpc-middleware/[email protected]/interceptors/recovery/interceptors.go:30 +0x67
panic({0x1fe6fc0?, 0x3a52170?})
  /usr/local/go/src/runtime/panic.go:783 +0x132
k8s.io/apimachinery/pkg/util/runtime.handleCrash({0x2718160, 0x3ac5900}, {0x1fe6fc0, 0x3a52170}, {0xc0005f6988, 0x0, 0xc000983300?})
  /go/pkg/mod/k8s.io/[email protected]/pkg/util/runtime/runtime.go:114 +0x1a9
k8s.io/apimachinery/pkg/util/runtime.HandleCrash({0x0, 0x0, 0xc000794c40?})
  /go/pkg/mod/k8s.io/[email protected]/pkg/util/runtime/runtime.go:64 +0x17b
panic({0x1fe6fc0?, 0x3a52170?})
  /usr/local/go/src/runtime/panic.go:783 +0x132
k8s.io/apimachinery/pkg/util/runtime.handleCrash({0x2718160, 0x3ac5900}, {0x1fe6fc0, 0x3a52170}, {0xc0005f6b70, 0x0, 0x2?})
  /go/pkg/mod/k8s.io/[email protected]/pkg/util/runtime/runtime.go:114 +0x1a9
k8s.io/apimachinery/pkg/util/runtime.HandleCrash({0x0, 0x0, 0xc000794c40?})
  /go/pkg/mod/k8s.io/[email protected]/pkg/util/runtime/runtime.go:64 +0x17b
panic({0x1fe6fc0?, 0x3a52170?})
  /usr/local/go/src/runtime/panic.go:783 +0x132
github.com/cloudnative-pg/plugin-barman-cloud/internal/cnpgi/instance.setLastFailedBackupTime.func1()
  /workspace/internal/cnpgi/instance/recovery_window.go:62 +0x1e5
k8s.io/client-go/util/retry.OnError.func1()
  /go/pkg/mod/k8s.io/[email protected]/util/retry/util.go:51 +0x30
k8s.io/apimachinery/pkg/util/wait.runConditionWithCrashProtection(0x493caa?)
  /go/pkg/mod/k8s.io/[email protected]/pkg/util/wait/wait.go:150 +0x3e
k8s.io/apimachinery/pkg/util/wait.ExponentialBackoff({0x989680, 0x4014000000000000, 0x3fb999999999999a, 0x4, 0x0}, 0xc0005f6f08)
  /go/pkg/mod/k8s.io/[email protected]/pkg/util/wait/backoff.go:477 +0x5a
k8s.io/client-go/util/retry.OnError({0x989680, 0x4014000000000000, 0x3fb999999999999a, 0x4, 0x0}, 0xc000982d00?, 0xc0005f6f90?)
  /go/pkg/mod/k8s.io/[email protected]/util/retry/util.go:50 +0x96
k8s.io/client-go/util/retry.RetryOnConflict(...)
  /go/pkg/mod/k8s.io/[email protected]/util/retry/util.go:104
github.com/cloudnative-pg/plugin-barman-cloud/internal/cnpgi/instance.setLastFailedBackupTime({0x2718080?, 0xc00002aab0?}, {0x272c460?, 0xc0005dff50?}, {{0xc0009740d7?, 0xc0005f70c8?}, {0xc0009742c0?, 0x0?}}, {0xc0009740e0, 0x10}, ...)
  /workspace/internal/cnpgi/instance/recovery_window.go:54 +0x152
github.com/cloudnative-pg/plugin-barman-cloud/internal/cnpgi/instance.BackupServiceImplementation.handleBackupError.func1()
  /workspace/internal/cnpgi/instance/backup.go:182 +0xdd
k8s.io/client-go/util/retry.OnError.func1()
  /go/pkg/mod/k8s.io/[email protected]/util/retry/util.go:51 +0x30
k8s.io/apimachinery/pkg/util/wait.runConditionWithCrashProtection(0x1?)
  /go/pkg/mod/k8s.io/[email protected]/pkg/util/wait/wait.go:150 +0x3e
k8s.io/apimachinery/pkg/util/wait.ExponentialBackoff({0x989680, 0x4014000000000000, 0x3fb999999999999a, 0x4, 0x0}, 0xc0005f71a8)
  /go/pkg/mod/k8s.io/[email protected]/pkg/util/wait/backoff.go:477 +0x5a
k8s.io/client-go/util/retry.OnError({0x989680, 0x4014000000000000, 0x3fb999999999999a, 0x4, 0x0}, 0x0?, 0x0?)
  /go/pkg/mod/k8s.io/[email protected]/util/retry/util.go:50 +0x96
k8s.io/client-go/util/retry.RetryOnConflict(...)
  /go/pkg/mod/k8s.io/[email protected]/util/retry/util.go:104
github.com/cloudnative-pg/plugin-barman-cloud/internal/cnpgi/instance.BackupServiceImplementation.handleBackupError({{0x272c460, 0xc0005dff50}, {0xc000054029, 0x12}, {}}, {0x2718080?, 0xc00002aab0?}, 0x0?)
  /workspace/internal/cnpgi/instance/backup.go:179 +0x109
github.com/cloudnative-pg/plugin-barman-cloud/internal/cnpgi/instance.BackupServiceImplementation.Backup({{0x272c460, 0xc0005dff50}, {0xc000054029, 0x12}, {}}, {0x2718080, 0xc00002aab0}, 0xc0009881e0)
  /workspace/internal/cnpgi/instance/backup.go:106 +0x65a
github.com/cloudnative-pg/cnpg-i/pkg/backup._Backup_Backup_Handler.func1({0x2718080?, 0xc00002aab0?}, {0x2191fc0?, 0xc0009881e0?})
  /go/pkg/mod/github.com/cloudnative-pg/[email protected]/pkg/backup/backup_grpc.pb.go:140 +0xcb
github.com/grpc-ecosystem/go-grpc-middleware/v2/interceptors/recovery.UnaryServerInterceptor.func1({0x2718080?, 0xc00002aab0?}, {0x2191fc0?, 0xc0009881e0?}, 0x1fe7320?, 0x3ac5900?)
  /go/pkg/mod/github.com/grpc-ecosystem/go-grpc-middleware/[email protected]/interceptors/recovery/interceptors.go:34 +0x8a
google.golang.org/grpc.getChainUnaryHandler.func1.getChainUnaryHandler.1({0x2718080, 0xc00002aab0}, {0x2191fc0, 0xc0009881e0})
  /go/pkg/mod/google.golang.org/[email protected]/server.go:1243 +0xa8
github.com/cloudnative-pg/cnpg-i-machinery/pkg/pluginhelper/http.(*Server).Start.loggingUnaryServerInterceptor.func3({0x2718080?, 0xc00002aa80?}, {0x2191fc0, 0xc0009881e0}, 0x189ecda?, 0xc000982640)
  /go/pkg/mod/github.com/cloudnative-pg/[email protected]/pkg/pluginhelper/http/grpc.go:37 +0x48
google.golang.org/grpc.getChainUnaryHandler.func1({0x2718080?, 0xc00002aa80?}, {0x2191fc0?, 0xc0009881e0?})
  /go/pkg/mod/google.golang.org/[email protected]/server.go:1243 +0x153
github.com/cloudnative-pg/cnpg-i-machinery/pkg/pluginhelper/http.(*Server).Start.logFailedRequestsUnaryServerInterceptor.func2({0x2718080?, 0xc00002aa80?}, {0x2191fc0?, 0xc0009881e0?}, 0xc0008202c0, 0xc000020480?)
  /go/pkg/mod/github.com/cloudnative-pg/[email protected]/pkg/pluginhelper/http/grpc.go:49 +0x54
google.golang.org/grpc.NewServer.chainUnaryServerInterceptors.chainUnaryInterceptors.func1({0x2718080, 0xc00002aa80}, {0x2191fc0, 0xc0009881e0}, 0xc0008202c0, 0x80?)
  /go/pkg/mod/google.golang.org/[email protected]/server.go:1234 +0x7c
github.com/cloudnative-pg/cnpg-i/pkg/backup._Backup_Backup_Handler({0x21ed8a0, 0xc0004a56e0}, {0x2718080, 0xc00002aa80}, 0xc000984400, 0xc0004a7d60)
  /go/pkg/mod/github.com/cloudnative-pg/[email protected]/pkg/backup/backup_grpc.pb.go:142 +0x143
google.golang.org/grpc.(*Server).processUnaryRPC(0xc0001a6a00, {0x2718080, 0xc00002a9f0}, 0xc000988180, 0xc00062a060, 0x3a73b58, 0x0)
  /go/pkg/mod/google.golang.org/[email protected]/server.go:1431 +0xfe8
google.golang.org/grpc.(*Server).handleStream(0xc0001a6a00, {0x27189c0, 0xc0004641a0}, 0xc000988180)
  /go/pkg/mod/google.golang.org/[email protected]/server.go:1842 +0xb95
google.golang.org/grpc.(*Server).serveStreams.func2.1()
  /go/pkg/mod/google.golang.org/[email protected]/server.go:1061 +0x7f
created by google.golang.org/grpc.(*Server).serveStreams.func2 in goroutine 334
  /go/pkg/mod/google.golang.org/[email protected]/server.go:1072 +0x11d

  Instance ID:
    Container ID:  containerd://01afa109471c0e4714c3e98d98a27d48c7474f1c78f539cb3312600a28f253fc
    Pod Name:      umami-pg-cluster-1
  Method:          plugin
  Phase:           failed
Events:
  Type    Reason    Age   From                   Message
  ----    ------    ----  ----                   -------
  Normal  Starting  5s    cloudnative-pg-backup  Starting backup for cluster umami-pg-cluster
  Normal  Starting  4s    local-webserver        Backup started
  Normal  Failed    0s    local-webserver        Backup failed

@songtianlun

Hi @songtianlun! I'm Dosu and I’m helping the plugin-barman-cloud team.

This error is caused by a bug in the plugin-barman-cloud code: the function that updates the backup status (setLastFailedBackupTime) tries to write to a map (ServerRecoveryWindow) that hasn't been initialized yet, which triggers a panic in Go when the backup fails. This is not a configuration or usage mistake—it's a missing map initialization in the plugin itself, and it affects both v0.6.0 and the latest main branch. There is currently no workaround or configuration change that can prevent this; a code fix is required in the plugin to properly initialize the map before assignment, as is done elsewhere in the code. You can track this issue and monitor for a fix in the plugin-barman-cloud repository. More details on the root cause are available here.

To reply, just mention @dosu.

Share context across your team and agents. Try Dosu.

It might be because I'm using Cloudflare R2 storage. While I've been able to seamlessly replace Minio/AWS S3 with R2 elsewhere, it doesn't work here. I can't identify the issue at the moment, so I'll switch back to Minio for now.

It might be, but the code should definitely not panic. I'm proposing a fix.

fix: avoid panicking if serverRecoveryWindow has still not been set

fix: avoid panicking if serverRecoveryWindow has still not been set (#…

fix: avoid panicking if serverRecoveryWindow has still not been set (c…

feat(container): update image ghcr.io/cloudnative-pg/charts/plugin-ba…

chore(deps): update dependency https://github.com/cloudnative-pg/plug…

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Unable to create backup, panic: assignment to entry in nil map #523

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Unable to create backup, panic: assignment to entry in nil map #523

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dosubot commented on Sep 17, 2025

songtianlun commented on Sep 18, 2025

leonardoce commented on Sep 18, 2025

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