[dpdk-dev] [v3] kni: fix possible kernel crash with va2pa

[Ferruh Yigit]

On 7/2/2019 9:07 PM, Junxiao Shi wrote:
> I am battling a related problem as reported on
> https://bugs.dpdk.org/show_bug.cgi?id=183 and this patch seems
> relevant, so I applied this patch on 196a46fab6eeb3ce2039e3bcaca80f8ba43ffc8d
> 
> However, this patch does not work for me:
> with CONFIG_RTE_LIBRTE_MBUF_DEBUG enabled, kni_free_mbufs's invocation of
> rte_pktmbuf_free throws "bad mbuf pool" error.
> 
> While all mbufs and segments in kni->rx_q now have physical addresses,
> the mbufs and segments placed back to kni->free_q still have (mis-)calculated
> virtual address. The pa2va function is not working properly.
> 
> Consequently, userspace side is passing wrong pointer to rte_pktmbuf_free,
> so that application crashes with CONFIG_RTE_LIBRTE_MBUF_DEBUG enabled.
> 

Hi Junxiao,

I don't see any issue in the code, and as far as I tested not seeing any issue.

Can you please provide more information how to reproduce the issue, is it only
enabling "CONFIG_RTE_LIBRTE_MBUF_DEBUG" config?

Thanks,
ferruh