Re: [Qemu-devel] qemu-system-sparc64 hang (possibly virtio related?) with 2.1

["Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>]

Alexander Graf <agraf@suse.de> writes:

> On 03.09.14 23:21, Aneesh Kumar K.V wrote:
>> "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> writes:
>> 
>>> Stefan Hajnoczi <stefanha@gmail.com> writes:
>>>
>>>> On Tue, Sep 02, 2014 at 02:12:45PM +0100, Mark Cave-Ayland wrote:
>>>>> Fortunately I can reproduce the issue with a debug-enabled build of
>>>>> qemu-system-sparc64, and I've posted a backtrace obtained during the hung
>>>>> state at http://www.ilande.co.uk/tmp/sparc64-gdb-bt.txt. I can't see
>>>>> anything too obvious, other than that the ppoll() could possibly be waiting
>>>>> for a bad file descriptor?
>>>>
>>>> The backtrace looks like a normal QEMU run.  Nothing obvious there.
>>>>
>>>> This suggests the QEMU monitor is still operational and the guest is
>>>> still executing code.
>>>>
>>>> Does the I/O time out inside the guest?  Normally messages are printed
>>>> in dmesg if I/O requests are pending for too long.
>>>
>>> I am also finding this on ppc64. The system hang even with virtio-9p, so
>>> it may not be virtio blk related. git bisect is complicated because few
>>> commits in between cause other boot failures with ppc64.
>> 
>> The bad commit is:
>> 
>> git show cc943c36faa192cd4b32af8fe5edb31894017d35
>> commit cc943c36faa192cd4b32af8fe5edb31894017d35
>> Author: Jan Kiszka <jan.kiszka@siemens.com>
>> Date:   Sun Jul 27 09:08:29 2014 +0200
>> 
>>     pci: Use bus master address space for delivering MSI/MSI-X messages
>
> Does "spapr_pci: map the MSI window in each PHB" from Greg fix this for
> you on ppc64?
>

Yes that patch fixed the issue for me.

Thanks,
-aneesh