Re: [Qemu-devel] Ubuntu/Debian Installer + Virtio-SCSI -> Bad ram pointer

[Peter Lieven]

Am 31.10.2012 um 15:08 schrieb ronnie sahlberg:

> On Tue, Oct 30, 2012 at 10:48 PM, Stefan Hajnoczi <address@hidden> wrote:
>> On Tue, Oct 30, 2012 at 10:09 PM, ronnie sahlberg
>> <address@hidden> wrote:
>>> About half a year there was an issue where recent kernels had added
>>> support to start using new scsi opcodes,  but the qemu functions that
>>> determine "which transfer direction is used for this opcode" had not
>>> yet been updated, so that the opcode was sent with the wrong transfer
>>> direction.
>>> 
>>> That caused the guests memory to be overwritten and crash.
>>> 
>>> I dont have (easy) access to the git tree right now, but it was a
>>> patch for the ATA_PASSTHROUGH command that fixed that.
>> 
>> This patch?
>> 
>> http://patchwork.ozlabs.org/patch/174946/
>> 
>> Stefan
> 
> This is the one I was thinking about :
> 381b634c275ca1a2806e97392527bbfc01bcb333
> 
> But that also crashed when using local /dev/sg* devices.

I was using a local LVM Volume not an iSCSI disk. 

I added debugging output and breakpoints to scsi_cmd_xfer_mode().
The function is not called.

Peter