Re: [Xen-devel] Re: Continuing problems booting

[M A Young <m.a.young@xxxxxxxxxxxx>]

On Sun, 22 Feb 2009, Jeremy Fitzhardinge wrote:

> That's a pity; I was hoping those problems would be behind us...  Do you have 
> any log messages relating to them?
ata is still timimg out, and the devices don't work. Some 
errors from a kvm boot are
ata1: PATA max MWDMA2 cmd 0x1f0 ctl 0x3f6 bmdma 0xc000 irq 14
ata2: PATA max MWDMA2 cmd 0x170 ctl 0x376 bmdma 0xc008 irq 15
ata2.00: ATAPI: QEMU DVD-ROM, 0.9.1, max UDMA/100
ata2.00: configured for MWDMA2
Clocksource tsc unstable (delta = -2149391501 ns)
ata2.00: qc timeout (cmd 0xa0)
ata2.00: TEST_UNIT_READY failed (err_mask=0x4)
ata2.00: configured for MWDMA2
ata2.00: qc timeout (cmd 0xa0)
ata2.00: TEST_UNIT_READY failed (err_mask=0x4)
ata2.00: limiting speed to MWDMA2:PIO3
ata2.00: configured for MWDMA2

ata2.00: TEST_UNIT_READY failed (err_mask=0x4)
ata2.00: disabled
ata2: soft resetting link
ata2: EH complete

> The NULL pointer dereferences are much more of a worry, and a bit random. 
> Looks like the stack pointer has got trashed or something, so its not giving 
> any useful information.  Do you know what was going on before then?
I haven't yet seen the NULL pointer dereferences in x86_64, but for i686 
boot they would just be part of the ordinary system startup, which I think 
in that case might have got far enough to try to fire off an X boot 
screen (the kernel was from before the last couple of days of drm related 
fixes were applied).
        Michael Young

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