[Lustre-discuss] WARNING: short read while accessing file >4GB on 32-bit client

Mag Gam magawake at gmail.com
Wed Dec 9 18:50:40 PST 2009

Thanks for letting us know.

Is there a website or newsgroup other than bugzilla to show us these
types of warnings and bugs and related patch/bugzilla entry?

On Wed, Dec 9, 2009 at 6:16 PM, Johann Lombardi <johann at sun.com> wrote:
> Hi all,
> A bug impacting 32-bit lustre clients has been identified in the most recent
> 1.8 releases. This issue manifests itself as a short read from files larger
> than 4GB.
> The problem is that, on the read path, the lustre client stores the file size
> temporarily in a 32-bit variable (this happens only when a glimpse is
> necessary). When an application then tries to read beyond the 4GB offset,
> variable overflow occurs, resulting in a truncated read returned to the
> application. To be clear, this is a client side issue and the file is not at
> all corrupted on disk. 64-bit clients are not impacted by this problem.
> This regression was introduced in 1.8.1 and will be resolved in 1.8.2 so also
> affects Releases and prior (including 1.8.0) are unaffected.
> A patch is available in bug 21506.
> Best regards,
> Johann
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