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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 - bus/pci: Secondary process initialization kills non-DPDK network interfaces"
href="https://bugs.dpdk.org/show_bug.cgi?id=1738">1738</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>bus/pci: Secondary process initialization kills non-DPDK network interfaces
</td>
</tr>
<tr>
<th>Product</th>
<td>DPDK
</td>
</tr>
<tr>
<th>Version</th>
<td>25.03
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>UNCONFIRMED
</td>
</tr>
<tr>
<th>Severity</th>
<td>major
</td>
</tr>
<tr>
<th>Priority</th>
<td>Normal
</td>
</tr>
<tr>
<th>Component</th>
<td>core
</td>
</tr>
<tr>
<th>Assignee</th>
<td>dev@dpdk.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>yonig@radcom.com
</td>
</tr>
<tr>
<th>Target Milestone</th>
<td>---
</td>
</tr></table>
<p>
<div class="bz_comment_block">
<pre class="bz_comment_text">On a system with one virtio interface bound to vfio-pci and additional virtio
interfaces bound to the kernel driver: Starting a secondary DPDK process (with
a -a flag specifying the pci address bound to vfio) causes all the kernel
network interfaces to stop working, requiring a reboot.
This behavior is reproduced on a specific environment consisting of several
VMs, but we have been unable to reproduce it on other environments, which also
use virtio and the same kernel version.
Steps to Reproduce:
./dpdk-testpmd -l 4,5 -n 4 -a 0000:00:04.0 --proc-type=primary -- -i
./dpdk-testpmd -l 6,7 -n 4 -a 0000:00:04.0 --proc-type=secondary -- -i
This happens on all dpdk versions starting at 24.3.
I have narrowed the cause down to the following two commits:
4b741542ecde - bus/pci: avoid depending on private kernel value
647a0a6ecb04 - bus/pci: fix VFIO region info in secondary process
Without these commits there is no issue. With only 4b741542ecde, there is an
error in the secondary process initialization (virtio_pci_init(): failed to
remap pci device). With both commits, the network dies during secondary process
initialization.
The kernel log contains lines such as:
kernel: NETDEV WATCHDOG: ens3 (virtio_net): transmit queue 0 timed out
...
kernel: virtio_net virtio0 ens3: TX timeout on queue: 0, sq: output.0, vq: 0x1,
name: output.0, 5286000 usecs ago
Kernel version: kernel 5.14.0-362.8.1.el9_3.x86_64
</pre>
</div>
</p>
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