Re: [Xen-devel] file corruption!!!

[Chris Andrews <chris@xxxxxxxxxx>]

On 17 Jul 2004, at 16:25, Andy Isaacson wrote:

> On Fri, Jul 16, 2004 at 04:06:20PM +1000, James Harper wrote:
> > I copied the file back from a known good source and restarted the
> > compile, but it aborted pretty quickly with internal gcc errors etc.
> >
> > I then tried a basic file corruption test - copying large files of
> > known data back and forth lots and then finally compare to the
> > original but that started seg faulting, and then the process hung in a
> > 'D' state, so i'm rebooting now.
> >
> > When it comes back up i'll try to break it again.
> Sounds like hardware failure.  Run memtest86 for an hour or so and let
> us know whether it finds any errors.
Well, I also have similar corruption in my domain0 filesystems, and 
I've heard of another instance, so there could be something in this.
Running -unstable as of yesterday, but with v1.9 of 
linux-2.4.26-xen-sparse/arch/xen/drivers/blkif/backend/vbd.c, as the 
v1.11 changes seem to break exporting block devices from domain0. The 
filesystems are on devicemapper LVs, but copying to a file and 
exporting the loop device didn't help -- the xenU kernel reports 'no 
device' for /dev/sda1 when it tries to mount root. The same export 
statement worked when booting the kernel with earlier vbd.c.
I've just rebooted into a 2.6.6 kernel and fscked everything, and 
domain0's /usr needed plenty of repair. I'm going to let the machine 
chug for a bit in 2.6.6 and see if any problems show up. (The machine 
is remote, so I can't easily run memtest86.)
I also have a serial console problem - the console connection works 
fine with Linux 2.6, but appears to only work in one direction with Xen 
- I see the bios output, grub output, then Xen output, but once domain0 
is booting I can't send characters, although ^A^A^A does switch between 
domain0 and Xen and I do see further console jibber.
I'm booting with this grub stanza:

title Xen Virtualised Linux
root (hd0,0)
kernel /boot/xen.gz dom0_mem=131072 com1=9600,8n1 watchdog 
console=com1,vga
module /boot/vmlinuz-2.4.26-xen0 root=/dev/sda1 ro console=tty0 
console=ttyS0,9600 panic=30

Cheers,
Chris.



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