On 03/07/2016 02:35 PM, Paolo Bonzini wrote:
>
>
> On 07/03/2016 13:29, Christian Borntraeger wrote:
>> Folks,
>>
>> I had a crash of a qemu guest in tracked_request_begin.
>> The testcase was a guest with ramdisk/kernel that reboots in a
>> loop. (about 10 times per second) with a single null-co disk
>> attached.
>
> Does it use a separate iothread?
yes
libvirt kludge (why is there no null-co/null-aio in libvirt?) looks like
<qemu:commandline>
<qemu:arg value='-drive'/>
<qemu:arg value='driver=null-co,id=null8,if=none,size=100G'/>
<qemu:arg value='-device'/>
<qemu:arg
value='virtio-blk-ccw,scsi=off,drive=null8,serial=null8,iothread=iothread1'/>
</qemu:commandline>
