Re: Page fault in FreeBSD 5.3 on IBM e325, Dual AMD64 2.2GHz, 4GB RAM, ServeRAID 6M - debug logs

From: Ganbold <ganbold_at_micom.mng.net>
Date: Tue, 23 Nov 2004 10:31:02 +0800
At 06:43 PM 11/22/2004, you wrote:

>On Mon, 22 Nov 2004, Ganbold wrote:
>
> > Fatal trap 12: page fault while in kernel mode
> > cpuid = 1; apic id = 01
> > fault virtual address = 0x18
> > fault code            = supervisor read, page not present
> > instruction pointer   = 0x8:0xffffffff80277fc0
> > stack pointer         = 0x10:0xffffffffb36ab830
> > frame pointer         = 0x10:0xffffffffb36ab890
> > 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               = 44 (swi1: net)
> > [thread 100044]
> > Stopped at      m_copym+0x190:  incl    %ecx
><...>
> > 
> --------------------------------------------------------------------------------------------------------
> >
> > It seems to me the problem is related to network stack and threading.
> > Am I right? How to solve this problem?
>
>I've seen reports of this problem with and without debug.mpsafenet=1,
>which suggests it is a network stack bug but not specific to locking. I've
>also seen reports that disabling TCP SACK will make the problem go away,
>which would be good to confirm.  I spent the weekend building up some more
>expertise in TCP and reading a lot of TCP code, and hope to look at this
>problem in more detail today.  You may want to try turning off TCP sack
>using net.inet.tcp.sack.enable=0 in sysctl.conf (or loader.conf).

Thanks Robert. I will try as you suggested and let you know.
Please let me know if you find the fix to this problem later on.

thanks,

Ganbold


>Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
>robert_at_fledge.watson.org      Principal Research Scientist, McAfee Research
>
>
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Received on Tue Nov 23 2004 - 01:31:16 UTC

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