DPDK usage discussions
 help / color / mirror / Atom feed
From: Stephen Hemminger <stephen@networkplumber.org>
To: Alex Kiselev <alex@therouter.net>
Cc: users@dpdk.org
Subject: Re: [dpdk-users] segmention fault while accessing mbuf
Date: Mon, 1 Jun 2020 09:17:29 -0700
Message-ID: <20200601091729.03ea9e50@hermes.lan> (raw)
In-Reply-To: <504fcb6e5a12a03035e7b55507e7c279@therouter.net>

On Mon, 01 Jun 2020 15:24:25 +0200
Alex Kiselev <alex@therouter.net> wrote:

> Hello,
> 
> I've got a segmentation fault error in my data plane path.
> I am pretty sure the code where the segfault happened is ok,
> so my guess is that I somehow received a corrupted mbuf.
> How could I troubleshoot this? Is there any way?
> Is it possible that other threads of the application
> corrupted that mbuf?
> 
> I would really appriciate any advice.
> Thanks.
> 
> DPDK 18.11.3
> NIC: 82599ES
> 
> Code:
> 
> nb_rx = rte_eth_rx_burst(port_id, queue_id, pkts_burst,
> 		  MAX_PKT_BURST);
> 
> ...
> 
> for (i=0; i < vec_size; i++) {
> 	rte_prefetch0(rte_pktmbuf_mtod(m_v[i], void *));
> 
> for (i=0; i < vec_size; i++) {
> 	m = m_v[i];
> 	eth_hdr = rte_pktmbuf_mtod(m, struct ether_hdr *);
> 	eth_type = rte_be_to_cpu_16(eth_hdr->ether_type);               <--- 
> Segmentation fault
> 	...
> 
> #0  rte_arch_bswap16 (_x=<error reading variable: Cannot access memory 
> at address 0x4d80000000053010>)

Build with as many of the debug options turned on in the DPDK config,
and build with EXTRA_CFLAGS of -g.

  reply	other threads:[~2020-06-01 16:17 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-01 13:24 Alex Kiselev
2020-06-01 16:17 ` Stephen Hemminger [this message]
2020-06-02 18:46   ` Alex Kiselev
2020-06-06 12:59   ` Alex Kiselev
2020-06-07  2:41     ` Cliff Burdick
2020-06-07  9:59       ` Alex Kiselev
2020-06-07 13:16         ` Cliff Burdick
2020-06-07 13:36           ` Alex Kiselev
2020-06-07 15:21             ` Cliff Burdick
2020-06-07 17:11               ` Alex Kiselev
2020-06-07 18:11                 ` Cliff Burdick
2020-06-07 22:56                   ` Alex Kiselev

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200601091729.03ea9e50@hermes.lan \
    --to=stephen@networkplumber.org \
    --cc=alex@therouter.net \
    --cc=users@dpdk.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

DPDK usage discussions

This inbox may be cloned and mirrored by anyone:

	git clone --mirror https://inbox.dpdk.org/users/0 users/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 users users/ https://inbox.dpdk.org/users \
		users@dpdk.org
	public-inbox-index users

Example config snippet for mirrors.
Newsgroup available over NNTP:
	nntp://inbox.dpdk.org/inbox.dpdk.users


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git