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Date: Mon, 01 Jun 2020 15:24:25 +0200
From: Alex Kiselev <alex@therouter.net>
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Subject: [dpdk-users] segmention fault while accessing mbuf
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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>)