Date: Mon, 2 Nov 2009 10:35:56 -0800 From: Pyun YongHyeon <pyunyh@gmail.com> To: Norbert Papke <npapke@acm.org> Cc: freebsd-stable@freebsd.org Subject: Re: 7.2 Stable Crash - possibly related to if_re Message-ID: <20091102183556.GA1256@michelle.cdnetworks.com> In-Reply-To: <200911020845.44042.npapke@acm.org> References: <200910292156.19845.npapke@acm.org> <200910301823.51274.npapke@acm.org> <20091031212107.GC17243@michelle.cdnetworks.com> <200911020845.44042.npapke@acm.org>
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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@acm.org
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