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  1. Couchbase Server
  2. MB-32220

Alice CLONE[MB-31479] - panic when replication stops because of nil error

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Details

    • Bug
    • Status: Closed
    • Major
    • Resolution: Fixed
    • 6.0.0
    • 6.0.1
    • XDCR
    • Untriaged
    • Unknown

    Description

      Saw the following dump in logs in MB-31477. A nil error caused xdcr to panic.

      The code is in utils.ExponentialBackoffExecutorWithFinishSignal().

      err = fmt.Errorf("%v %v Last error: %v", name, base.ErrorFailedAfterRetry.Error(), err.Error())

       err.Error() would panic if err is nil.

      err is always not nil in normal execution path. err could be nil when the method exits due to timeout, though.

       

      2018-10-01T16:02:48.904-07:00 WARN GOXDCR.Utils: ExponentialBackoffExecutorWithFinishSignal for StatsMapOnVBToSeqno aborting because of finch closure
      2018-10-01T16:02:48.904-07:00 INFO GOXDCR.CheckpointMgr: Done one time checkpointing for replication 56588e1ffae793e05948c77a6e28360d/mem/rep-mem
      panic: runtime error: invalid memory address or nil pointer dereference
      [signal SIGSEGV: segmentation violation code=0x1 addr=0x20 pc=0x7cbec9]

      goroutine 2028 [running]:
      github.com/couchbase/goxdcr/utils.(*Utilities).ExponentialBackoffExecutorWithFinishSignal(0xc42000e1a8, 0xa3ede2, 0x13, 0xbebc200, 0x5, 0x2, 0xc420abd3c0, 0x0, 0x0, 0xc42087efc0, ...)
      goproj/src/github.com/couchbase/goxdcr/utils/utils.go:2416 +0x419
      github.com/couchbase/goxdcr/pipeline_svc.(*CheckpointManager).getHighSeqnoAndVBUuidForServerWithRetry(0xc420175b00, 0xc420878800, 0x38, 0xc420423400, 0x200, 0x200, 0xc42024e000, 0xc42087efc0)
      goproj/src/github.com/couchbase/goxdcr/pipeline_svc/checkpoint_manager.go:445 +0x18c
      github.com/couchbase/goxdcr/pipeline_svc.(*CheckpointManager).getHighSeqnoAndVBUuidFromTarget(0xc420175b00, 0xc42087efc0, 0x0)
      goproj/src/github.com/couchbase/goxdcr/pipeline_svc/checkpoint_manager.go:407 +0x172
      github.com/couchbase/goxdcr/pipeline_svc.(*CheckpointManager).PerformCkpt(0xc420175b00, 0xc42087efc0)
      goproj/src/github.com/couchbase/goxdcr/pipeline_svc/checkpoint_manager.go:1020 +0x58d
      github.com/couchbase/goxdcr/pipeline_svc.(*CheckpointManager).CheckpointBeforeStop.func1(0xc420175b00, 0xc42087efc0, 0xc42087ef50)
      goproj/src/github.com/couchbase/goxdcr/pipeline_svc/checkpoint_manager.go:485 +0x35
      created by github.com/couchbase/goxdcr/pipeline_svc.(*CheckpointManager).CheckpointBeforeStop
      goproj/src/github.com/couchbase/goxdcr/pipeline_svc/checkpoint_manager.go:487 +0x216

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          Activity

            Build couchbase-server-6.0.1-1989 contains goxdcr commit 691f726 with commit message:
            MB-32220 fix panic in exponentialExecutor

            build-team Couchbase Build Team added a comment - Build couchbase-server-6.0.1-1989 contains goxdcr commit 691f726 with commit message: MB-32220 fix panic in exponentialExecutor

            Verified on 6.0.1-1999 following steps in MB31477

            pavithra.mahamani Pavithra Mahamani (Inactive) added a comment - Verified on 6.0.1-1999 following steps in MB31477

            People

              pavithra.mahamani Pavithra Mahamani (Inactive)
              yu Yu Sui (Inactive)
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                Created:
                Updated:
                Resolved:

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