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[Qemu-discuss] block.c - assertion failed

From: Markus Stockhausen
Subject: [Qemu-discuss] block.c - assertion failed
Date: Mon, 15 Sep 2014 05:31:37 +0000

> Von: Evan Fraser address@hidden
> Gesendet: Montag, 15. September 2014 05:44
> An: Markus Stockhausen
> Betreff: [Qemu-discuss] block.c - assertion failed
> Hello Markus,
> Sorry for contacting you off list, but I wasn't subscribed to qemu-discuss 
> until now.
> I have also experienced this error with qemu 1.6.2 on Fedora 20.  Did you 
> happen 
> to get anywhere with identifying/working around the problem?
> Some details about my error in case that helps rule out things for you/I are:
>   * My VM's vdisks live on an NFS export.
>   * There was no real server load on the VM or host at the time of the error.
>   * The VM's were running Windows 2008R2 64bit with Redhat Virtio drivers
> In my case I strongly suspect the issue is down to the windows Virtio 
> drivers.  
> I haven't had this happen with any Linux based VMs.
> First thing I'm doing is getting the end users to upgrade their drivers to 
> the latest version.
> Cheers,
> Evan.

Hi Evan,

I guess you are referring my post from end of june about VMs terminating all of
a sudden. http://lists.gnu.org/archive/html/qemu-discuss/2014-06/msg00094.html
Good to hear that others are facing the same error. Your mail arrives only 3 
after we hit the error the second time. 

To sum up my environment/situation:

- NFS based storage for images.
- hypervisor is running in an OVirt cluster (shouldn't be relevant)
- Affected VM OS: SLES 11 SP3 
- Error occured during "heavy" disk I/O while running backups inside VM

We have no real clue what is going on. Comparing that with your scenario I 
not blame the VM. The issue must be somewhere in the lower layers of the stack. 
But it's just a guess. If I find time I will open a Redhat bugzilla.


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