[dm-devel] Access beyond end of device with LVM2 over sw RAID1

[David Vidal Rodríguez]

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Hello everyone,

I am new to this list, looking for an explanation of a problem which has
been there for a relatively long time. I've found nothing similar in the
mailing list archive, hence this mail.

Discs configuration: 2 S-ATA HDs configured as a RAID-1 mirror, on top
of which an LVM2 volume group (VG) sits. Different logical volumes (LVs)
are defined there, one of which (/home) has a snapshot. Everything is
managed with IBM's EVMS tool set, so I'm using EVMS volumes on top of
each LV.

While running kernel 2.6.10, everything is allright. But when I use one
of the 2.6.11.* or 2.6.12-* kernels, reading files on /home leads to
innumerable I/O errors, and the kernel complains about trying to access
beyond the end of the dm device. Note that I'm reading the original
volume, not the snapshot. Volumes without a snapshot don't show this
behavior. In fact, although the root filesystem is also an EVMS volume
on top of an LV, the system boots normally.

The problem goes away if I either downgrade to 2.6.10 or remove the
snapshot.

Is this a known problem, and if not, should I give more informations?

Thank you in advance,
David VIDAL RODRIGUEZ
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