[dpdk-dev] virtio: crash when using multiple processes (16.04 regression)

[Thomas Monjalon]

2016-05-19 16:20, Yoni Gilad:
> We have encountered a crash in virtio_xmit_pkts (specifically, in the call to virtqueue_notify) when running DPDK in a multi-process setup. This is a regression in DPDK 16.04.

Thanks a lot for reporting.

2 tips to improve such bug report:

- Send it to the maintainer of virtio (and cc this list).
You can find them in the MAINTAINERS file. I've cc'ed them.

- Try to test early the release candidates to have it fixed before
the bug is really released.

> The culprit seems to be the field vtpci_ops in the virtio_hw structure. This field is stored in shared memory, but points to a struct in the primary process's address space. If the same struct was loaded in a different address in the secondary process, it will lead to a crash or other issues when this field is dereferenced there. The referenced virtio_pci_ops struct contains function pointers, which can also be different in the secondary process.