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Re: [Xen-users] FreeBSD DomU Fatal trap 12 in cpu_switch_load_gs

To: Geoff Buckingham <geoffb@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] FreeBSD DomU Fatal trap 12 in cpu_switch_load_gs
From: Kip Macy <kip.macy@xxxxxxxxx>
Date: Wed, 9 Nov 2005 13:46:42 -0600
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This is a bug that I had thought that I had fixed. I haven't done anything with 5.3 on 2.0.7 in quite some time. Up until the xenbus changes I was tracking 3.0 and was going to check into 6.0 CVS.

I ended up taking a break after xenbus went in. I didn't anticipate the level of churn that came with the xenbus changes.  However, judging from the 6-month slip in the planned release date of 3.0, no one else did either.

Is this a pre-built binary? Or one that you compiled? If it is one that you compiled then your best bet may be waiting until FreeBSD works on 3.0 again. I'd like to say soon, but it isn't at the front of my current queue.


On 11/9/05, Geoff Buckingham <geoffb@xxxxxxxxxxxxxxxxxxx> wrote:
I see the following with a FreeBSD 5.3 DomU on 2.0.7

Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0xca7a0088
fault code              = supervisor read, page not present
instruction pointer     = 0x819:0xc0183343
stack pointer           = 0x821:0xca069d30
frame pointer           = 0x821:0x0
code segment            = base 0x235, limit 0x8485e7c3, type 0x9
                        = DPL 0, pres 1, def32 1, gran 0
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 1943 (cc)
trap number             = 12
panic: page fault

%nm -n XENUkernelNFS |grep c0183343
c0183343 T cpu_switch_load_gs

This is with a kernel compiled to run diskless over nfs and no kdb. With
KDB enabled the machine just hangs (I assume the debugger is trying to
attach to a non-existent serial port)

Should I be running 2.0.7 2.0-testing or 3.x to stand the best chance of getting a stable FreeBSD DomU? Is this already fixed somewhere?

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