Commit 1a92fc9 appears to work around the issue on amd64. Thanks!
On 3/8/26 22:40, Mark Millard wrote:
On 3/8/26 10:39, Herbert J. Skuhra wrote:
On Tue, 03 Mar 2026 18:37:57 +0100, Andrew Turner wrote:
The branch main has been updated by andrew:
URL:
https://cgit.FreeBSD.org/src/commit/?id=c499ad6f997c8c5f61c88925e6d1e826d0c0f6c4
commit c499ad6f997c8c5f61c88925e6d1e826d0c0f6c4
Author: Sarah Walker <[email protected]>
AuthorDate: 2026-03-03 16:08:11 +0000
Commit: Andrew Turner <[email protected]>
CommitDate: 2026-03-03 16:29:15 +0000
virtio: Use bus_dma for ring and indirect buffer allocations
While the majority of virtio platforms will be fully coherent, some may
require cache maintenance or other specific device memory handling (eg for
secure partitioning). Using bus_dma allows for these usecases.
The virtio buffers are marked as coherent; this should ensure that sync
calls are no-ops in the common cases.
Reviewed by: andrew
Sponsored by: Arm Ltd
Differential Revision: https://reviews.freebsd.org/D54959
---
sys/dev/virtio/virtio_ring.h | 27 ++++--
sys/dev/virtio/virtqueue.c | 216 +++++++++++++++++++++++++++++++++++++------
2 files changed, 209 insertions(+), 34 deletions(-)
After this change I see a lot of "kernel: vtnet0: watchdog timeout on
queue xx" errors on amd64 (arm64 seems to be OK).
See below about other reports of the messages.
Reverting this commit resolves the issue.
freebsd-current has the following notes, implicitly referencing official
builders doing official builds:
QUOTE
On 3/8/26 17:10, Philip Paeps wrote:
On 2026-03-08 07:10:01 (+0800), Michael Butler wrote:
Is anyone else seeing timeouts on virtual interfaces? e.g.
Mar 7 15:00:27 george kernel: vtnet0: watchdog timeout on queue 0
Mar 7 15:00:45 george kernel: vtnet0: watchdog timeout on queue 0
I started seeing these on today's build too.
It seems to happen more or less randomly. I can't point at anything
specific that might be triggering it.
Philip
END QUOTE
