Date: Mon, 24 May 2010 09:48:33 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-stable@freebsd.org Cc: Pyun YongHyeon <pyunyh@gmail.com>, Nikolay Denev <ndenev@gmail.com> Subject: Re: if_sge related panics Message-ID: <201005240948.33555.jhb@freebsd.org> In-Reply-To: <77DFF2E5-7A1E-4063-A852-2C7AD9BC3DD4@gmail.com> References: <E7AF7DD3-FE50-42DD-8391-0F576708EAF7@gmail.com> <77DFF2E5-7A1E-4063-A852-2C7AD9BC3DD4@gmail.com>
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On Monday 24 May 2010 6:35:01 am Nikolay Denev wrote:
> On May 24, 2010, at 8:57 AM, Nikolay Denev wrote:
>
> > Hi,
> >
> > 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.
> >
> > Here is the panic message :
> >
> > Fatal trap 12: page fault while in kernel mode
> > cpuid = 0; apic id = 00
> > fault virtual address = 0x8
> > fault code = supervisor write data, page not present
> > instruction pointer = 0x20:0xffffffff80230413
> > stack pointer = 0x28:0xffffff80001e9280
> > frame pointer = 0x28:0xffffff80001e9510
> > code segment = base 0x0, limit 0xfffff, type 0x1b
> > = DPL 0, pres 1, long 1, def32 0, gran 1
> > processor eflags = interrupt enabled, resume, IOPL = 0
> > current process = 12 (irq19: sge0)
> > trap number = 12
> > panic: page fault
> > cpuid = 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
> >
> > 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.
>
> Here is some info from the crashdump :
>
> (kgdb) #0 doadump () at pcpu.h:223
> #1 0xffffffff802fb149 in boot (howto=260)
> at /usr/src/sys/kern/kern_shutdown.c:416
> #2 0xffffffff802fb57c in panic (fmt=0xffffffff8055d564 "%s")
> at /usr/src/sys/kern/kern_shutdown.c:590
> #3 0xffffffff805055b8 in trap_fatal (frame=0xffffff000288a3e0, eva=Variable "eva" is not available.
> )
> at /usr/src/sys/amd64/amd64/trap.c:777
> #4 0xffffffff805059dc in trap_pfault (frame=0xffffff80001e91d0, usermode=0)
> at /usr/src/sys/amd64/amd64/trap.c:693
> #5 0xffffffff805061c5 in trap (frame=0xffffff80001e91d0)
> 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=0xffffff000270d800)
> at /usr/src/sys/dev/sge/if_sge.c:1591
Try this. sge_encap() can sometimes return an error with m_head set to NULL:
Index: if_sge.c
===================================================================
--- if_sge.c (revision 208375)
+++ if_sge.c (working copy)
@@ -1588,7 +1588,8 @@
if (m_head == NULL)
break;
if (sge_encap(sc, &m_head)) {
- IFQ_DRV_PREPEND(&ifp->if_snd, m_head);
+ if (m_head != NULL)
+ IFQ_DRV_PREPEND(&ifp->if_snd, m_head);
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
break;
}
--
John Baldwin
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