7.2 Stable Crash - possibly related to if_re
Pyun YongHyeon
pyunyh at gmail.com
Mon Nov 2 18:36:43 UTC 2009
On Mon, Nov 02, 2009 at 08:45:43AM -0800, Norbert Papke wrote:
> On October 31, 2009, Pyun YongHyeon wrote:
> > On Fri, Oct 30, 2009 at 06:23:51PM -0700, Norbert Papke wrote:
> > > On October 30, 2009, Pyun YongHyeon wrote:
> > > > On Thu, Oct 29, 2009 at 09:56:19PM -0700, Norbert Papke wrote:
> > > > > This occurred shortly after "scp"ing from a VirtualBox VM to the
> > > > > host. The file transfer got stuck. The "re" interface stopped
> > > > > working. Shortly afterwards, the host crashed. The "re" interface
> > > > > was used by the host, the guest was using a different NIC in bridged
> > > > > mode.
> > > > >
> > > > >
> > > > > FreeBSD proven.lan 7.2-STABLE FreeBSD 7.2-STABLE #5 r198666: Thu Oct
> > > > > 29 18:36:57 PDT 2009
> > > > >
> > > > > Fatal trap 12: page fault while in kernel mode
> > > > > cpuid = 0; apic id = 00
> > > > > fault virtual address = 0x18
> > > >
> > > > It looks like a NULL pointer dereference, possibly mbuf related
> > > > one.
> > > >
> > > > > fault code = supervisor write data, page not present
> > > > > instruction pointer = 0x8:0xffffffff80d476ee
> > > > > stack pointer = 0x10:0xffffff8000078ae0
> > > > > frame pointer = 0x10:0xffffff8000078b40
> > > > > 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 = 18 (swi5: +)
>
>
> > > > By chance, did you stop the re0 interface with ifconfig when you
> > > > noticed the file transfer got stuck?
> > >
> > > It is possible. I had it happen twice. The first time I definitely
> > > tried to "down" re. I cannot recall what I did the second time. The
> > > crash dump is from the second time.
> >
> > Ok, then would you try attached patch?
>
> I have been running with the patch for a couple of days. Although I can still
> reproduce the lock-up of the network stack, I have not been able to reproduce
> the panic. The patch does what it is supposed to do.
>
Thanks a lot for testing! Patch committed to HEAD(r198814)
> I will continue to try to come up with a better test case for the file
> transfer problem. However, I no longer suspect "re" as a cause.
>
> Thank you very much for your help.
>
> Cheers,
>
> -- Norbert Papke.
> npapke at acm.org
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