Date: Mon, 24 May 2010 18:51:39 +0300 From: Nikolay Denev <ndenev@gmail.com> To: John Baldwin <jhb@freebsd.org> Cc: Pyun YongHyeon <pyunyh@gmail.com>, freebsd-stable@freebsd.org Subject: Re: if_sge related panics Message-ID: <95486977-A9EA-41CE-8F1E-AD3EF537E889@gmail.com> In-Reply-To: <201005240948.33555.jhb@freebsd.org> References: <E7AF7DD3-FE50-42DD-8391-0F576708EAF7@gmail.com> <77DFF2E5-7A1E-4063-A852-2C7AD9BC3DD4@gmail.com> <201005240948.33555.jhb@freebsd.org>
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On May 24, 2010, at 4:48 PM, John Baldwin wrote:
> On Monday 24 May 2010 6:35:01 am Nikolay Denev wrote:
>> On May 24, 2010, at 8:57 AM, Nikolay Denev wrote:
>>=20
>>> Hi,
>>>=20
>>> Recently I started to experience a if_sge(4) related panic.
>>> It happens almost every time I try to download a torrent file for =
example.
>>> Copying of large files over NFS seem not to trigger it, but I =
haven't tested extensively.
>>>=20
>>> Here is the panic message :
>>>=20
>>> Fatal trap 12: page fault while in kernel mode
>>> cpuid =3D 0; apic id =3D 00
>>> fault virtual address =3D 0x8
>>> fault code =3D supervisor write data, page =
not present
>>> instruction pointer =3D 0x20:0xffffffff80230413
>>> stack pointer =3D =
0x28:0xffffff80001e9280
>>> frame pointer =3D 0x28:0xffffff80001e9510
>>> code segment =3D base 0x0, limit 0xfffff, =
type 0x1b
>>> =3D DPL 0, pres 1, long =
1, def32 0, gran 1
>>> processor eflags =3D interrupt enabled, resume, =
IOPL =3D 0
>>> current process =3D 12 (irq19: sge0)
>>> trap number =3D 12
>>> panic: page fault
>>> cpuid =3D 0
>>> Uptime: 1d20h56m20s
>>> Cannot dump. Device not defined or unavailable
>>> Automatic reboot in 15 seconds - press a key on the console to abort
>>> Sleeping thread (tid 100039, pid 12) owns a non-sleepable lock
>>>=20
>>> My swap is on a zvol, so I don't have dump. I'll try to attach a =
disk on the eSATA port and dump there if needed.
>>=20
>> Here is some info from the crashdump :
>>=20
>> (kgdb) #0 doadump () at pcpu.h:223
>> #1 0xffffffff802fb149 in boot (howto=3D260)
>> at /usr/src/sys/kern/kern_shutdown.c:416
>> #2 0xffffffff802fb57c in panic (fmt=3D0xffffffff8055d564 "%s")
>> at /usr/src/sys/kern/kern_shutdown.c:590
>> #3 0xffffffff805055b8 in trap_fatal (frame=3D0xffffff000288a3e0, =
eva=3DVariable "eva" is not available.
>> )
>> at /usr/src/sys/amd64/amd64/trap.c:777
>> #4 0xffffffff805059dc in trap_pfault (frame=3D0xffffff80001e91d0, =
usermode=3D0)
>> at /usr/src/sys/amd64/amd64/trap.c:693
>> #5 0xffffffff805061c5 in trap (frame=3D0xffffff80001e91d0)
>> at /usr/src/sys/amd64/amd64/trap.c:451
>> #6 0xffffffff804eb977 in calltrap ()
>> at /usr/src/sys/amd64/amd64/exception.S:223
>> #7 0xffffffff80230413 in sge_start_locked (ifp=3D0xffffff000270d800)
>> at /usr/src/sys/dev/sge/if_sge.c:1591
>=20
> Try this. sge_encap() can sometimes return an error with m_head set =
to NULL:
>=20
> Index: if_sge.c
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> --- if_sge.c (revision 208375)
> +++ if_sge.c (working copy)
> @@ -1588,7 +1588,8 @@
> if (m_head =3D=3D NULL)
> break;
> if (sge_encap(sc, &m_head)) {
> - IFQ_DRV_PREPEND(&ifp->if_snd, m_head);
> + if (m_head !=3D NULL)
> + IFQ_DRV_PREPEND(&ifp->if_snd, m_head);
> ifp->if_drv_flags |=3D IFF_DRV_OACTIVE;
> break;
> }
>=20
> --=20
> John Baldwin
Thanks, patch applied. Will let you know how it goes.
--
Niki=
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