# Panic error, "panic: name bytes\_read already used"

**URL:** <https://discuss.elastic.co/t/panic-error-panic-name-bytes-read-already-used/82840>\
**Category:** Beats\
**Tags:** filebeat\
**Created:** [April 19, 2017, 8:30am UTC](https://discuss.elastic.co/t/panic-error-panic-name-bytes-read-already-used/82840 "2017-04-19T08:30:56Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![QC\_Wong](https://avatars.discourse-cdn.com/v4/letter/q/ecae2f/32.png) [@QC\_Wong](https://discuss.elastic.co/u/QC_Wong)\
**Post date:** [April 19, 2017, 8:30am UTC](https://discuss.elastic.co/t/panic-error-panic-name-bytes-read-already-used/82840/1 "2017-04-19T08:30:56Z")

</div>

Hi,  
I receive the following panic error:

> panic: name bytes\_read already used

> goroutine 41 [running]:  
> panic(0x9250a0, 0xc4203279a0)  
> /usr/local/go/src/runtime/panic.go:500 +0x1a1  
> [github.com/elastic/beats/libbeat/monitoring.panicErr](http://github.com/elastic/beats/libbeat/monitoring.panicErr)(0xc77f00, 0xc4203279a0)  
> /go/src/github.com/elastic/beats/libbeat/monitoring/registry.go:227 +0x5c  
> [github.com/elastic/beats/libbeat/monitoring.(\*Registry).Add](http://github.com/elastic/beats/libbeat/monitoring.(*Registry).Add)(0xc4201898c0, 0x9de67a, 0xa, 0xc7a980, 0xc420327970, 0x10101)  
> /go/src/github.com/elastic/beats/libbeat/monitoring/registry.go:129 +0xb2  
> [github.com/elastic/beats/libbeat/monitoring/adapter.(\*GoMetricsRegistry).doRegister](http://github.com/elastic/beats/libbeat/monitoring/adapter.(*GoMetricsRegistry).doRegister)(0xc42017ab60, 0x9e41b7, 0x12, 0x8ff600, 0xa29698, 0xc4202b2000, 0x7f5d51c87960)  
> /go/src/github.com/elastic/beats/libbeat/monitoring/adapter/go-metrics.go:130 +0x1e7  
> [github.com/elastic/beats/libbeat/monitoring/adapter.(\*GoMetricsRegistry).GetOrRegister](http://github.com/elastic/beats/libbeat/monitoring/adapter.(*GoMetricsRegistry).GetOrRegister)(0xc42017ab60, 0x9e41b7, 0x12, 0x8ff600, 0xa29698, 0x20, 0x99e440)  
> /go/src/github.com/elastic/beats/libbeat/monitoring/adapter/go-metrics.go:103 +0x88  
> [github.com/elastic/beats/vendor/github.com/rcrowley/go-metrics.GetOrRegisterMeter](http://github.com/elastic/beats/vendor/github.com/rcrowley/go-metrics.GetOrRegisterMeter)(0x9e41b7, 0x12, 0xc838a0, 0xc42017ab60, 0x1000, 0x1000)  
> /go/src/github.com/elastic/beats/vendor/github.com/rcrowley/go-metrics/meter.go:26 +0x6a  
> [github.com/elastic/beats/vendor/github.com/Shopify/sarama.(\*Broker).Open.func1()](http://github.com/elastic/beats/vendor/github.com/Shopify/sarama.(*Broker).Open.func1())  
> /go/src/github.com/elastic/beats/vendor/github.com/Shopify/sarama/broker.go:106 +0x430  
> [github.com/elastic/beats/vendor/github.com/Shopify/sarama.withRecover(0xc42032a3a0)](http://github.com/elastic/beats/vendor/github.com/Shopify/sarama.withRecover(0xc42032a3a0))  
> /go/src/github.com/elastic/beats/vendor/github.com/Shopify/sarama/utils.go:46 +0x43  
> created by [github.com/elastic/beats/vendor/github.com/Shopify/sarama.(\*Broker).Open](http://github.com/elastic/beats/vendor/github.com/Shopify/sarama.(*Broker).Open)  
> /go/src/github.com/elastic/beats/vendor/github.com/Shopify/sarama/broker.go:149 +0x15c

This is my config file:

> max\_procs: 3  
> filebeat.spool\_size: 4096  
> filebeat.idle\_timeout: 5s
> 
> filebeat.prospectors:
> 
> - input\_type: log  
> paths:
> - /data/log/test.log  
> json.keys\_under\_root: true  
> fields\_under\_root: true  
> tail\_files: true  
> tags: ["test\_log"]  
> fields:  
> topic: "test\_topic"
> 
> output.kafka:  
> hosts: ["kafkahost:9092",]  
> topic: "%{[topic]}"  
> partition.round\_robin:  
> reachable\_only: true  
> required\_acks: 1  
> compression: gzip  
> max\_message\_bytes: 1000000  
> worker: 3  
> channel\_buffer\_size: 4096  
> bulk\_max\_size: 4096  
> flush\_interval: 3
> 
> logging.level: info  
> logging.to\_files: true  
> logging.to\_syslog: false  
> logging.files:  
> path: /data/somewhere  
> name: filebeat.log  
> keepfiles: 150

And this is OS Version:  
Linux ubuntu 3.2.0-93-generic x86\_64

I'm using Filebeat 5.3.0.  
Start filebeat: sudo ./filebeat start

I don't know why this Panic error occurred. please help me.  
thanks

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<div class="post-metadata">

**Author:** ![giuseppe](https://avatars.discourse-cdn.com/v4/letter/g/48db29/32.png) [@giuseppe](https://discuss.elastic.co/u/giuseppe)\
**Post date:** [April 19, 2017, 6:46pm UTC](https://discuss.elastic.co/t/panic-error-panic-name-bytes-read-already-used/82840/2 "2017-04-19T18:46:06Z")

</div>

Hi,

I wasn't able to reproduce on 5.3.0. One thing I noticed is the alignment in your config seems off, but maybe it's just here? I had to reformat it this way:

```auto
max_procs: 3
filebeat.spool_size: 4096
filebeat.idle_timeout: 5s

filebeat.prospectors:
- input_type: log
  paths:
    - /data/log/test.log
  json.keys_under_root: true
  fields_under_root: true
  tail_files: true
  tags: ["test_log"]
  fields:
  topic: "test_topic"

output.kafka:
  hosts: ["kafkahost:9092"]
  topic: "%{[topic]}"
  partition.round_robin:
  reachable_only: true
  required_acks: 1
  compression: gzip
  max_message_bytes: 1000000
  worker: 3
  channel_buffer_size: 4096
  bulk_max_size: 4096
  flush_interval: 3

logging.level: info
logging.to_files: true
logging.to_syslog: false
logging.files:
  path: /data/somewhere
  name: filebeat.log
  keepfiles: 150

```

---

<div class="post-metadata">

**Author:** ![QC\_Wong](https://avatars.discourse-cdn.com/v4/letter/q/ecae2f/32.png) [@QC\_Wong](https://discuss.elastic.co/u/QC_Wong)\
**Post date:** [April 20, 2017, 2:28am UTC](https://discuss.elastic.co/t/panic-error-panic-name-bytes-read-already-used/82840/3 "2017-04-20T02:28:01Z")

</div>

Hi giuseppe, my config file has already formatted, that's just something wrong when I paste to the question.

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<div class="post-metadata">

**Author:** ![ruflin](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ruflin/32/3116_2.png) [@ruflin](https://discuss.elastic.co/u/ruflin)\
**Post date:** [April 21, 2017, 11:16am UTC](https://discuss.elastic.co/t/panic-error-panic-name-bytes-read-already-used/82840/4 "2017-04-21T11:16:00Z")

</div>

There seem to be a conflict between the metrics reported by our kafka library and our internal monitoring. The panic should not happen. Could you open a issue on Github with this?

@steffens Can you have a look at this?

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<div class="post-metadata">

**Author:** ![steffens](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/steffens/32/79630_2.png) [@steffens](https://discuss.elastic.co/u/steffens)\
**Post date:** [April 21, 2017, 11:24am UTC](https://discuss.elastic.co/t/panic-error-panic-name-bytes-read-already-used/82840/5 "2017-04-21T11:24:00Z")

</div>

Checking the stack-trace this looks like a race-condition to me. Can you open an [issue on github](https://github.com/elastic/beats/issues)?

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [May 19, 2017, 11:35am UTC](https://discuss.elastic.co/t/panic-error-panic-name-bytes-read-already-used/82840/6 "2017-05-19T11:35:17Z")

</div>

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