[Bug 168411] [vm] [panic] uma_find_refcnt(): zone possibly not UMA_ZONE_REFCNT

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=168411

--- Comment #2 from Andrey V. Elsukov <ae at FreeBSD.org> ---
I found the cause of our panics. ixgbe(4) needs to have configured the size of
buffer to receive packets via SRRCTL registers.
In our case it used 4k buffers and for jumbo frames the size of the first
buffer always was 4k. So, even if we correctly set m_len/m_pkthdr.len it always
writes 4k into m_data. This leads to memory corruption due that the size of
available space in the mbuf is less than 4k (128 bytes reserved). After we
correctly configure SRRCTL registers the panics disappeared.

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