Re: [Qemu-devel] virtio-scsi + iothread : segfault on drive_del

[Alexandre DERUMIER]

Ok,

thanks paolo !

----- Mail original -----
De: "pbonzini" <address@hidden>
À: "aderumier" <address@hidden>, "qemu-devel" <address@hidden>
Envoyé: Mercredi 1 Avril 2015 12:27:27
Objet: Re: virtio-scsi + iothread : segfault on drive_del

On 01/04/2015 05:34, Alexandre DERUMIER wrote: 
> 
> I'm currently testing virtio-scsi and iothread, 
> 
> and I'm seeing qemu segfault when I try to remove an scsi drive 
> on top of an virtio-scsi controller with iothread enabled. 
> 
> 
> virtio-blk + iothread drive_del is supported since this patch 
> 
> http://comments.gmane.org/gmane.comp.emulators.qemu/291562 
> "block: support drive_del with dataplane 
> 
> This series makes hot unplug work with virtio-blk dataplane devices. It 
> should 
> also work with Fam's virtio-scsi dataplane patches." 

virtio-scsi + iothread is experimental and not yet thread-safe. 

Deadlocks or crashes are expected, and not really fixable without a lot 
of preparatory changes to core QEMU code. These are being done, but I 
don't expect it to be fixed before 2.5. 

Paolo