[Bug 254244] panics after upgrade to stable/13-n244861-b9773574371

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254244

Hans Petter Selasky <hselasky at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |shurd at FreeBSD.org

--- Comment #13 from Hans Petter Selasky <hselasky at FreeBSD.org> ---
The last commit that touched this code path was:

commit 35e4e998d8187c1d4d413bdc13a79a6415a30a18
Author: Stephen Hurd <shurd at FreeBSD.org>
Date:   Mon Nov 6 16:23:21 2017 +0000

    Only chain non-LRO mbufs when LRO is not possible

    Preserve packet order between tcp_lro_rx() and if_input() to avoid
    creating extra corner cases. If no packets can be LROed, combine them
    into one chain for submission via if_input(). If any packet can
    potentially be LROed however, retain old behaviour and call if_input()
    for each packet.

    This should keep the 12% improvement for small packet forwarding intact,
    but mostly avoids impacting the LRO case.

    Reviewed by:    cem, sbruno
    Approved by:    sbruno (mentor)
    Sponsored by:   Limelight Networks
    Differential Revision:  https://reviews.freebsd.org/D12876

Notes:
    svn path=/head/; revision=325487

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