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  1. Go Driver
  2. GODRIVER-3302

Panic when reading data from connection

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    • Type: Icon: Bug Bug
    • Resolution: Fixed
    • Priority: Icon: Major - P3 Major - P3
    • 2.0.0, 1.17.0
    • Affects Version/s: None
    • Component/s: None
    • None
    • Go Drivers
    • Not Needed
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      1. What would you like to communicate to the user about this feature?
      2. Would you like the user to see examples of the syntax and/or executable code and its output?
      3. Which versions of the driver/connector does this apply to?

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      1. What would you like to communicate to the user about this feature? 2. Would you like the user to see examples of the syntax and/or executable code and its output? 3. Which versions of the driver/connector does this apply to?

      Do not have exact steps to replicate the problem, but when running a performance test, I observed a bunch of i/o timeouts followed by panic

      [fetch] error fetching record: connection(<mongo-ip>:27017[-398]) incomplete read of full message: context deadline exceeded: read tcp <application-ip>:59026-><mongo-ip>:27017: i/o timeout
[fetch] error fetching record: connection(<mongo-ip>:27017[-390]) incomplete read of full message: context deadline exceeded: read tcp <application-ip>:59018-><mongo-ip>:27017: i/o timeout
[fetch] error fetching record: connection(<mongo-ip>:27017[-386]) incomplete read of full message: context deadline exceeded: read tcp <application-ip>:58999-><mongo-ip>:27017: i/o timeout
[fetch] error fetching record: connection(<mongo-ip>:27017[-370]) incomplete read of full message: context deadline exceeded: read tcp <application-ip>:58982-><mongo-ip>:27017: i/o timeout
panic: runtime error: slice bounds out of range [4:0]


goroutine 346147 [running]:
go.mongodb.org/mongo-driver/x/mongo/driver/topology.(*connection).read(0x14324e10588, {0x101c03710, 0x10272d100})
/Users/user/.gvm/pkgsets/go1.22.4/global/pkg/mod/go.mongodb.org/mongo-driver@v1.16.0/x/mongo/driver/topology/connection.go:488+0x46c
go.mongodb.org/mongo-driver/x/mongo/driver/topology.bgRead(0x14003382300, 0x14324e10588)
/Users/user/.gvm/pkgsets/go1.22.4/global/pkg/mod/go.mongodb.org/mongo-driver@v1.16.0/x/mongo/driver/topology/pool.go:827+0x2a8
created by go.mongodb.org/mongo-driver/x/mongo/driver/topology.(*pool).checkInNoEvent in goroutine 344634
/Users/user/.gvm/pkgsets/go1.22.4/global/pkg/mod/go.mongodb.org/mongo-driver@v1.16.0/x/mongo/driver/topology/pool.go:891+0x23c

      Go Version: 1.22.4{}

      Go Driver Version: v1.16.0

      MongoDB Server

      3 node cluster

      Server version: v6.0.16

      Hosted on GCP

      OS Version: Ubuntu 20.04.2 LTS

            Assignee:
            qingyang.hu@mongodb.com Qingyang Hu
            Reporter:
            mohan@rapido.bike Mohan Kumar B
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              Created:
              Updated:
              Resolved: