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Re: [Libguestfs] running libguestfs as a service?



On Thu, May 05, 2011 at 12:44:38PM -0400, T Johnson wrote:
> I've been strapped for time to work on this lately, but have a couple
> updates. I have been using the updated RHEL 6.1 packages, so
> unfortunately that doesn't seem to solve the problem yet.
> 
> I'm still having some trouble capturing all the output, but I have
> manged to collect this verbose output after aborting a "stalled"
> request:
> 
> [   35.206396] end_request: I/O error, dev vda, sector 2048
> [   35.207363] Buffer I/O error on device vda1, logical block 0
> [   35.207384] lost page write due to I/O error on vda1
> [   35.207384] Buffer I/O error on device vda1, logical block 1
> [   35.207384] lost page write due to I/O error on vda1
> [   35.207384] end_request: I/O error, dev vda, sector 1574912
> [   35.207384] Buffer I/O error on device vda1, logical block 196608
> [   35.207384] lost page write due to I/O error on vda1
> [   35.207384] end_request: I/O error, dev vda, sector 1575624
> [   35.207384] Buffer I/O error on device vda1, logical block 196697
> [   35.207384] lost page write due to I/O error on vda1
> check_for_daemon_cancellation_or_eof: 0x1786f80 g->state = 3, fd = 66
> child_cleanup: 0x1786f80: child process died
> 
> I should probably note that this is being done over NFS mounted
> images. I'm fairly sure there aren't NFS problems though, as the NFS
> mounts are quite stable and otherwise seem to respond just fine
> against the same mounts at the same time this problem occurs.
> 
> I'm hoping the above might trigger some ideas but I'm still working on
> trying to figure out the lack of verbose data to stderr otherwise.

There seem to be a number of different things going on, but I really
don't have enough detail to be able to fix this.  This error seems to
be unrelated to the Python issues you were having before.

The I/O errors above would be because the underlying disk is somehow
read-only to qemu.

For NFS I guess this could be because of root_squash-ing.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
virt-p2v converts physical machines to virtual machines.  Boot with a
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