Comment 1 for bug 939027
Revision history for this message
| Stefan Hajnoczi (stefanha) wrote Re: [Qemu-devel] [Bug 939027] [NEW] Combining direct_io and non-direct_io leads to hang | #1 |
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0e1f616
(Get the code!)
On Wed, Feb 22, 2012 at 09:49:59PM -0000, Avleen Vig wrote:
> Version 0.12.2 - I know this isn't the latest but I looked through the
> changelogs and couldn't find any references to this being fixed.
>
> This is related to issues that many apps have, and is described in more detail here:
> http://
> and:
> https:/
>
> When using both direct io and buffered io on the same file, you can cause corruption on the filesystem and other issues.
> XFS out right hangs, but the problem exists on ext3 and other filesystems which silently carry on.
>
> **this is a data corruption issue**.
>
> This is the full stack trace we got from a recent hang:
I only see qemu-kvm in the backtrace. QEMU normally only access the
image file either with or without O_DIRECT - not both at the same time.
Were you running another program that accesses the image file at the
same time?
Stefan