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Subject: [Bug 148807] [panic] "panic: sbdrop" and "panic: sbsndptr: sockbuf _
 and mbuf _ clashing" (8.1-RELEASE/10.1-STABLE/11-CURRENT)
Date: Thu, 13 Oct 2016 17:55:40 +0000
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X-Bugzilla-Component: kern
X-Bugzilla-Version: 10.1-STABLE
X-Bugzilla-Keywords: crash, needs-qa, patch
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X-Bugzilla-Who: slw@zxy.spb.ru
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D148807

--- Comment #35 from slw@zxy.spb.ru ---
(In reply to Hiren Panchasara from comment #34)
> which value of 'm' should I trust? is it null in frame #22 or not? it see=
ms like null in the frames above it also.

=D0=97artially. ether_input call with m set to 0xfffff8014eee7600 (and this=
 is first
m for next invocation of further functions), do one (or more, w/ different =
m,
need access to vmcore by kgdb and analyse 0xfffff8014eee7600 for answer)
iteration w/  and call netisr_dispatch with passed m as second argument (in
%rsi register). All next invocation can don't preserve %rsi (or %rdx in cas=
e of
m passed as 3'th argument) and backtrace can incorrectly decode arguments c=
all.

Just realyty check: frame #19, ether_input_internal (ifp=3D<optimized out>,
m=3D0x0), line 483:

        if (m->m_len < ETHER_HDR_LEN) {

MUST occur kernel panic if m realy NULL.

This is just incorrect decoding of arguments.

--=20
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