<html>
<head>
<base href="https://bugs.dpdk.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8" class="bz_new_table">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_UNCONFIRMED "
title="UNCONFIRMED - virtio: reader/writer lock mismatch"
href="https://bugs.dpdk.org/show_bug.cgi?id=1582">1582</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>virtio: reader/writer lock mismatch
</td>
</tr>
<tr>
<th>Product</th>
<td>DPDK
</td>
</tr>
<tr>
<th>Version</th>
<td>24.11
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</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>ethdev
</td>
</tr>
<tr>
<th>Assignee</th>
<td>dev@dpdk.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>stephen@networkplumber.org
</td>
</tr>
<tr>
<th>Target Milestone</th>
<td>---
</td>
</tr></table>
<p>
<div class="bz_comment_block">
<pre class="bz_comment_text">The code virtio_dev_rx_async_submit has mismatch between locking the
access_lock for write, and then releases it with read_unlock. This could cause
all sorts of deadlock depending on the implementation of rwlock.
static __rte_always_inline uint32_t
virtio_dev_rx_async_submit(struct virtio_net *dev, struct vhost_virtqueue *vq,
struct rte_mbuf **pkts, uint32_t count, int16_t dma_id, uint16_t
vchan_id)
{
uint32_t nb_tx = 0;
VHOST_DATA_LOG(dev->ifname, DEBUG, "%s", __func__);
if (unlikely(!dma_copy_track[dma_id].vchans ||
!dma_copy_track[dma_id].vchans[vchan_id].pkts_cmpl_flag_addr)) {
VHOST_DATA_LOG(dev->ifname, ERR,
"%s: invalid channel %d:%u.",
__func__, dma_id, vchan_id);
return 0;
}
rte_rwlock_write_lock(&vq->access_lock);
if (unlikely(!vq->enabled || !vq->async))
goto out_access_unlock;
vhost_user_iotlb_rd_lock(vq);
if (unlikely(!vq->access_ok)) {
vhost_user_iotlb_rd_unlock(vq);
rte_rwlock_read_unlock(&vq->access_lock); <<<<<<<< HERE
virtio_dev_vring_translate(dev, vq);
goto out_no_unlock;
}
</pre>
</div>
</p>
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