Re: Creating a vm with a non-existent /dev/mapper/ tap2 device effectively hangs dom0 system

[Nathan March <nathan@gt.net>]

On 7/28/2011 12:00 PM, Nathan March wrote:
> On 7/27/2011 4:29 PM, Nathan March wrote:
>> Have an interesting one here, originally found on xen 4.1.0 but just 
>> upgraded to xen 4.1.1 and it's still here.
>>
>> Creating a VM with a tap2 device pointed at /dev/mapper/something, 
>> when that device doesn't exist, causes the tapdisk2 process to go 
>> into D mode and also manages to take out any process that queries it.
>>
>
> This also happens on proper shutdown of a VM, so I must have done 
> something crazy to the setup here since other people haven't been 
> complaining. If I start a VM, strace it's tapdisk2 and then send the 
> VM a shutdown, the strace shows tapdisk2 hanging here:

*sigh*, for anyone who finds this via google, tracked it down to a 
stupid error. Shouldn't be using tapdisk2 for accessing an iscsi device 
since it appears as a raw block device, after changing to using phy: 
things work properly.

- Nathan