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Date:      Sat, 15 Apr 2017 11:59:10 +0200
From:      "O. Hartmann" <ohartmann@walstatt.org>
To:        Konstantin Belousov <kostikbel@gmail.com>
Cc:        "O. Hartmann" <ohartmann@walstatt.org>, Alan Somers <asomers@freebsd.org>, FreeBSD CURRENT <freebsd-current@freebsd.org>
Subject:   Re: CURRENT (r316844): Fatal trap 12: page fault while in kernel mode (syslogd)
Message-ID:  <20170415115910.65e1a0ea@thor.intern.walstatt.dynvpn.de>
In-Reply-To: <20170415093334.GO1788@kib.kiev.ua>
References:  <20170414175246.2353dcf0@thor.intern.walstatt.dynvpn.de> <CAOtMX2gnNtBkWcJArauE=g5SP-F3h2QqazoOKBUfSVZZarkGPw@mail.gmail.com> <20170414185827.1ab68398@thor.intern.walstatt.dynvpn.de> <20170414171857.GK1788@kib.kiev.ua> <20170415111841.0c34be88@thor.intern.walstatt.dynvpn.de> <20170415093334.GO1788@kib.kiev.ua>

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Am Sat, 15 Apr 2017 12:33:34 +0300
Konstantin Belousov <kostikbel@gmail.com> schrieb:

> On Sat, Apr 15, 2017 at 11:18:41AM +0200, O. Hartmann wrote:
> > Am Fri, 14 Apr 2017 20:18:57 +0300
> > Konstantin Belousov <kostikbel@gmail.com> schrieb:
> >  =20
> > > On Fri, Apr 14, 2017 at 06:58:27PM +0200, O. Hartmann wrote: =20
> > > > Fatal trap 12: page fault while in kernel mode
> > > > cpuid =3D 2; apic id =3D 02
> > > > fault virtual address   =3D 0xfffff8001282fb00
> > > > fault code              =3D supervisor read instruction, protection=
 violation   =20
> > >  =20
> > > > ??() at 0xfffff8001282fb00
> > > > bpf_mtap() at bpf_mtap+0x1ab/frame 0xfffffe012d2aefb0
> > > > iflib_txq_drain() at iflib_txq_drain+0x1383/frame 0xfffffe012d2af130
> > > > drain_ring_lockless() at drain_ring_lockless+0xc0/frame 0xfffffe012=
d2af190
> > > > ifmp_ring_enqueue() at ifmp_ring_enqueue+0x32e/frame 0xfffffe012d2a=
f200
> > > > iflib_if_transmit() at iflib_if_transmit+0xb0/frame 0xfffffe012d2af=
240
> > > > ether_output() at ether_output+0x730/frame 0xfffffe012d2af2e0
> > > > arprequest() at arprequest+0x426/frame 0xfffffe012d2af3e0
> > > > arpresolve_full() at arpresolve_full+0x3d1/frame 0xfffffe012d2af460
> > > > arpresolve() at arpresolve+0x10c/frame 0xfffffe012d2af4d0
> > > > ether_output() at ether_output+0x4e1/frame 0xfffffe012d2af570
> > > > ip_output() at ip_output+0x14e6/frame 0xfffffe012d2af6b0
> > > > udp_send() at udp_send+0xab1/frame 0xfffffe012d2af780
> > > > sosend_dgram() at sosend_dgram+0x3e4/frame 0xfffffe012d2af7f0
> > > > kern_sendit() at kern_sendit+0x229/frame 0xfffffe012d2af890
> > > > sendit() at sendit+0x1a7/frame 0xfffffe012d2af8e0
> > > > sys_sendto() at sys_sendto+0x4d/frame 0xfffffe012d2af930
> > > > amd64_syscall() at amd64_syscall+0x4c2/frame 0xfffffe012d2afab0
> > > > Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe012d2afab0
> > > > syscall (133, FreeBSD ELF64, sys_sendto), rip =3D 0x800b8a5fa, rsp =
=3D 0x7fffffffd6b8,
> > > > rbp =3D 0x7fffffffdcc0 ---   =20
> > >=20
> > > You probably have BPF_JITTER option in your kernel config.  Either set
> > > net.bpf_jitter.enable to 0 for now, or remove the option.
> > >=20
> > > It is due to r316767. The issue is known and a solution is being disc=
ussed. =20
> >=20
> > simply setting "net.bpf_jitter.enable=3D0" in /boot/loader.conf.local d=
oesn't help, the
> > Trap 12 still occurs. =20
>=20
> It is sysctl, not tunable.

Correct, I didn't/couldn't think that far. Having a setting in /etc/sysctl.=
conf
accordingly, booting the kernel doesn't reveal the Trap 12 anymore.

Thanks.
Oliver


--=20
O. Hartmann

Ich widerspreche der Nutzung oder =C3=9Cbermittlung meiner Daten f=C3=BCr
Werbezwecke oder f=C3=BCr die Markt- oder Meinungsforschung (=C2=A7 28 Abs.=
 4 BDSG).

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