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<base href="https://bugs.dpdk.org/">
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<body><table border="1" cellspacing="0" cellpadding="8" class="bz_new_table">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_UNCONFIRMED "
title="UNCONFIRMED - dumpcap crashes with segmentation fault when capturing from af_packet"
href="https://bugs.dpdk.org/show_bug.cgi?id=1786">1786</a>
</td>
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<tr>
<th>Summary</th>
<td>dumpcap crashes with segmentation fault when capturing from af_packet
</td>
</tr>
<tr>
<th>Product</th>
<td>DPDK
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>All
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>UNCONFIRMED
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>Normal
</td>
</tr>
<tr>
<th>Component</th>
<td>ethdev
</td>
</tr>
<tr>
<th>Assignee</th>
<td>dev@dpdk.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>kerem.aksu@i2i-systems.com
</td>
</tr>
<tr>
<th>Target Milestone</th>
<td>---
</td>
</tr></table>
<p>
<div class="bz_comment_block">
<pre class="bz_comment_text">dumpcap crashes when capturing traffic from af_packet ethernet device.
$ ./dpdk-dumpcap -i 0
Capturing on 'net_af_packet0'
File: /tmp/dpdk-dumpcap_0_net_af_packet0_20250912103908.pcapng
Thread 1 "dpdk-dumpcap" received signal SIGSEGV, Segmentation fault.
0x00007ffff7e46d78 in strlcpy () from /lib/x86_64-linux-gnu/libbsd.so.0
#0 0x00007ffff7e46d78 in strlcpy () from /lib/x86_64-linux-gnu/libbsd.so.0
#1 0x0000555556406faa in eth_dev_change_flags (if_name=0x560490350da0 <error:
Cannot access memory at address 0x560490350da0>, flags=256, mask=4294967295) at
../drivers/net/af_packet/rte_eth_af_packet.c:592
#2 0x0000555556407080 in eth_dev_promiscuous_enable (dev=0x55555b38d680
<rte_eth_devices>) at ../drivers/net/af_packet/rte_eth_af_packet.c:613
#3 0x0000555556211eb1 in rte_eth_promiscuous_enable (port_id=0) at
../lib/ethdev/rte_ethdev.c:2680
#4 0x0000555555629a49 in enable_pdump (r=0x15b438040, mp=0x15ba3c900) at
../app/dumpcap/main.c:688
#5 0x000055555562af5b in main (argc=3, argv=0x7fffffffe448) at
../app/dumpcap/main.c:818
dumpcap tries to enable promiscuous mode on the host device but it cannot
access device name and crashes.
I think problem caused by a strdup(3) within rte_eth_af_packet.c:744 struct
pmd_internals * (internals)->if_name is allocated with strdup(3) which is not
accessible from secondary process (in this context dumpcap).
Allocating this field with rte_malloc probably will fix the issue.
</pre>
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