For the record I've just tested linux-
image-3.2.0-030200rc2-generic_3.2.0-030200rc2.201111151435 and the bug
is still present.  This is still on XenServer 5.6 SP2; I'll try to test
on a XS 6 install later.  (Lucid does work on both versions; the problem
is only with Oneiric.)

Stefan: I hadn't spotted the capacity change discrepancy, but on my
latest test with the above kernel I do get capacity change messages for
all three disks:

[    0.492436] blkfront: xvda: barrier: enabled
[    0.495160]  xvda: unknown partition table
[    0.496794] blkfront: xvdb: barrier: enabled
[    0.498990]  xvdb: unknown partition table
[    0.499217] Setting capacity to 524288
[    0.499225] xvda: detected capacity change from 0 to 268435456
[    0.499911] blkfront: xvdc: barrier: enabled
[    0.501937]  xvdc: unknown partition table
[    0.502127] Setting capacity to 12582912
[    0.502136] xvdb: detected capacity change from 0 to 6442450944
[    0.507102] Setting capacity to 1024000
[    0.507117] xvdc: detected capacity change from 0 to 524288000

These disks are all XenServer's NFS-backed virtual disks.  The bug does
NOT occur if the root filesystem is on local storage.

** Summary changed:

- Xen blkfront i/o errors prevent boot in domU
+ Xen blkfront i/o errors on NFS-backed disks prevent boot in domU

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https://bugs.launchpad.net/bugs/824089

Title:
  Xen blkfront i/o errors on NFS-backed disks prevent boot in domU

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