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From Vasanth Mathivanan <>
Subject RE: Traffic server suddenly drop the packets and crashed
Date Fri, 16 Nov 2018 14:39:08 GMT
Yes , its generating core dump  file in traffic server root path and we are using ATS.6.2 in
centos 6.5.

traffic.out logs

“ATAL: failed assert `sdk_sanity_check_mbuffer(bufp) == TS_SUCCESS`
traffic_server: using root directory '/opt/trafficserver'
traffic_server: received signal 6 (Aborted)
traffic_server - STACK TRACE:

No I did not set ephemeral ports .

Had default values already .

net.ipv4.ip_local_port_range = 32768     60999

net.ipv4.ip_local_reserved_ports =                    ###this one is empty

So its set by manually .

net.ipv4.ip_local_reserved_ports = 30000-31000

Is this ok ? .

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From: Susan Hinrichs<>
Sent: Friday, November 16, 2018 7:55 PM
Subject: Re: Traffic server suddenly drop the packets and crashed

Are you exhausting ephemeral ports?  What is the output of  "ss -s" on your Traffic Server
machine? That is quite easy exhaust all of the ephemeral ports for a single load testing client
machine between active and time-wait connections.

Is Traffic Server generating a core or a stack trace?  What version of Traffic Server?

On Fri, Nov 16, 2018 at 1:42 AM Vasanth Mathivanan <<>>
Hi ,

We are testing 1000 client access one by one load test after  700 clients dropping the packets
like “connection timeout” or “Connection reset by peer ” errors .

Ram and Cpus resources are everything is fine .Ethernet speed also 20gb/s both client  and
traffic server  . Origin server has 2gb/s speed between ATS and Origin server .While running
700 requests in origin server content will be  receiving speed less than 10Mb/s then traffic
server and client getting more than 1Gb/s speed .

We are also monitoring that resources everything running fine but crashed the traffic server
after 700 requests  .

Note: We are created Java player , We will give the no of  requests its call the particular
URL based on given requests .


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