Re: [Xen-devel] Re: Panic on cpu0

[ZhouPeng <zpengxen@xxxxxxxxx>]

The bug exist in iommu(Intel VT-d) support code.

After I disabled the vt-d in bios, system can boot properly.

2010/12/16 ZhouPeng <zpengxen@xxxxxxxxx>

The err msg appears in
void *map_domain_page(unsigned long mfn)
      BUG_ON(idx >= MAPCACHE_ENTRIES);

printk idx is 1024 and BUG_ON is called.

I print  Xen call trace msg:

[<ffcd3c2>]  map_domain_page+0x1a2/0x230
[<ff1cd718>] unmap_domain_page+0x148/0x160
                   addr_to_dma_page_maddr+0x1f6/0x250
                   __find_next_zero_bit+0x80/0x90
                   intel_iommu_map_page+0x14a/0x250
                   domain_context_mapping+0x14a/0x250
                   rmrr_identity_mapping+0xb7/0x120
                   intel_iommu_dom0_init+0x143/0x1eb
                   construct_dom0+0x138f/0x16b0
                   __start_xen+0x109a/0x1680
                   e820nf+0x0/0x4
                   __high_start+0x58/0x5a

2010/12/16 Pasi Kärkkäinen <pasik@xxxxxx>

On Thu, Dec 16, 2010 at 03:41:17PM +0800, ZhouPeng wrote:
>    (XEN) Panic on CPU 0:
>    (XEN) Xen BUG at domain_page.c:102
>
>    Any solutions?
>

You need to post the full boot log, including all output from both Xen and dom0 Linux.
See: http://wiki.xen.org/xenwiki/XenSerialConsole

-- Pasi

>    2010/12/16 ZhouPeng <[1]zpengxen@xxxxxxxxx>

>
>      Hi all,
>
>      I build xen4.1 from the tarbll (with kernel 2.6.32.26 downloaded by
>      default) on fedora8.
>
>      After installing, I get the err msg on startup:
>
>      (XEN) Panic on CPU 0:
>      (XEN) Xen BUG at domain_page.c:102
>
>      5 seconds later, the machine reboot.
>
>      How to deal with this problem.
>
>      Thanks,
>      --
>      Zhou Peng

>      My daily E-Mail: [2]ailvpeng25@xxxxxxxxx
>
>    --
>    Zhou Peng
>    My daily E-Mail: [3]ailvpeng25@xxxxxxxxx
>
> References
>
>    Visible links
>    1. mailto:zpengxen@xxxxxxxxx
>    2. mailto:ailvpeng25@xxxxxxxxx
>    3. mailto:ailvpeng25@xxxxxxxxx

> _______________________________________________
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--
Zhou Peng
My daily E-Mail: ailvpeng25@xxxxxxxxx

-- 
Zhou Peng
My daily E-Mail: ailvpeng25@xxxxxxxxx
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