Re: XFS: false "torn write" errors (preventing mount)

[Brian Foster <bfoster@redhat.com>]

On Mon, Feb 29, 2016 at 08:29:20AM -0700, Jan Beulich wrote:
> Brian,
> 
> on a system where I routinely run both a 32-bit and a 64-bit x86
> kernel (underneath the same 32-bit distro) I'm observing the
> newly added message being issued, along with the mounts
> subsequently failing when running the 32-bit kernel. Without
> doing anything to the FS, running an older 32-bit kernel or a
> 4.5-rc6 64-bit one have everything work fine (and silently), so
> I can only assume the detection logic doesn't work right in a
> 32-bit kernel. I've looked over commits 6528250b71 and
> 7088c4136f without being able to spot any obvious word size
> dependency, but then again I know nothing about the inner
> workings of the XFS code.
> 
> I'm now hoping that you have an idea what's going on here.
> 

There was one follow on fix related to byte order: 8e0bd4925bf6 ("xfs:
fix endianness error when checking log block crc on big endian
platforms"), but I don't think that would have any effect on an x86
kernel.

Is the 32-bit kernel problematic on its own, or must the 64-bit kernel
be involved somehow before the 32-bit kernel reproduces a problem? For
example, can you mkfs, mount and remount (perhaps multiple times) on the
32-bit kernel without a problem? If so, what happens if you transition
to the 64-bit kernel, remount a few times, and then go back to 32-bit?
In general, anything that narrows down the reproducer is helpful.

I don't appear to have a 32-bit env. handy so I'll kick off an install
in the meantime and take a closer look from there...

Brian

> Thanks, Jan
> 
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