From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <padam.singh@inventum.net>
Received: from smtp89.ord1c.emailsrvr.com (smtp89.ord1c.emailsrvr.com
 [108.166.43.89]) by dpdk.org (Postfix) with ESMTP id 7BA3737B2
 for <dev@dpdk.org>; Fri, 22 Apr 2016 10:51:53 +0200 (CEST)
Received: from smtp12.relay.ord1c.emailsrvr.com (localhost.localdomain
 [127.0.0.1])
 by smtp12.relay.ord1c.emailsrvr.com (SMTP Server) with ESMTP id E89CF3800CC
 for <dev@dpdk.org>; Fri, 22 Apr 2016 04:51:52 -0400 (EDT)
X-Auth-ID: padam.singh@inventum.net
Received: by smtp12.relay.ord1c.emailsrvr.com (Authenticated sender:
 padam.singh-AT-inventum.net) with ESMTPSA id 463FD3800B5
 for <dev@dpdk.org>; Fri, 22 Apr 2016 04:51:51 -0400 (EDT)
X-Sender-Id: padam.singh@inventum.net
Received: from [172.16.1.231] ([UNAVAILABLE]. [103.25.205.2])
 (using TLSv1 with cipher DHE-RSA-AES256-SHA)
 by 0.0.0.0:25 (trex/5.5.4); Fri, 22 Apr 2016 04:51:52 -0400
From: Padam Jeet Singh <padam.singh@inventum.net>
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Message-Id: <4A51DD33-CDB5-4688-90EA-22087C24B729@inventum.net>
Date: Fri, 22 Apr 2016 14:21:47 +0530
To: dev@dpdk.org
Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2104\))
X-Mailer: Apple Mail (2.2104)
Subject: [dpdk-dev] Segmentation fault in ip_frag_find
X-BeenThere: dev@dpdk.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: patches and discussions about DPDK <dev.dpdk.org>
List-Unsubscribe: <http://dpdk.org/ml/options/dev>,
 <mailto:dev-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://dpdk.org/ml/archives/dev/>
List-Post: <mailto:dev@dpdk.org>
List-Help: <mailto:dev-request@dpdk.org?subject=help>
List-Subscribe: <http://dpdk.org/ml/listinfo/dev>,
 <mailto:dev-request@dpdk.org?subject=subscribe>
X-List-Received-Date: Fri, 22 Apr 2016 08:51:53 -0000

Hello,

We are using the DPDK framework and testing the IP reassembly code.

While reassembly is working fine, the application segfaults with the =
following (partially shown) stack trace. The segfault is not entirely =
reproducible - it happens quite randomly.

Program terminated with signal 11, Segmentation fault.
#0  0x00000000004b3408 in ip_frag_find ()
(gdb) bt
#0  0x00000000004b3408 in ip_frag_find ()
#1  0x00000000004b0cde in rte_ipv4_frag_reassemble_packet ()

All the required checks before we call this function:

1. Death Row is initialised, and not null.
2. The reassemble table is initialised and not null.
3. Protect the reassembly code with a spin lock, so it=E2=80=99s not a =
thread issue.
4. Free the death row by calling rte_ip_frag_free_death_row post the =
reassembly call within the spin lock itself.
5. At transmit time, the reassembled packet is fragmented again to match =
the outbound MTU.

Version of DPDK is  1.7, however I have checked the git tree and not =
found any functional changes to till the stable version.

Any inputs/ideas on how the issue can be fixed?

Thanks,
Padam=