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Date:      Mon, 15 Aug 2016 10:55:25 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-net@FreeBSD.org
Subject:   [Bug 211836] Kernel panic with net.isr enabled
Message-ID:  <bug-211836-2472-TrMpYc2WXU@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-211836-2472@https.bugs.freebsd.org/bugzilla/>
References:  <bug-211836-2472@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D211836

Andrey V. Elsukov <ae@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |adrian@freebsd.org,
                   |                            |rwatson@FreeBSD.org

--- Comment #4 from Andrey V. Elsukov <ae@FreeBSD.org> ---
I guess it is related to RSS option.
Your system has many CPU cores, so RSS uses all of them. But netisr has onl=
y 2
initialized threads.=20
netisr_select_cpuid() uses rss_soft_m2cpuid_v4() to determine cpuid. Since =
the
last one doesn't limit cpuid with nws_count, we can get cpuid for which we
didn't initialized any data.=20
This works for one netisr thread, because we return *cpuidp =3D nws_array[0=
],
when nws_count =3D=3D 1.

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