Re: [Qemu-devel] [PATCH v5 00/10] Modify block jobs to use node-names

[Jeff Cody]

On Tue, Jun 17, 2014 at 06:19:13AM -0600, Eric Blake wrote:
> On 06/13/2014 12:52 PM, Jeff Cody wrote:
> > Changes from v4->v5:
> > 
> > * Rebased on master
> > * Fixed commit log typos / stale paragraphs (Eric)
> > * Fixed comment typo (Eric)
> > * Added Eric's remaining R-b's
> > 
> 
> On IRC, we found another bug that needs repairing:
> 
> # cd /tmp
> # echo tmp > tmp
> # qemu-kvm -qmp stdio -drive file=/tmp/tmp
> {"QMP": {"version": {"qemu": {"micro": 50, "minor": 0, "major": 2},
> "package": ""}, "capabilities": []}}
> {"execute":"qmp_capabilities"}
> {"return": {}}
> {"execute":"block-commit","arguments":{"device":"ide0-hd0"}}
> {"return": {}}
> {"timestamp": {"seconds": 1402972048, "microseconds": 153175}, "event":
> "BLOCK_JOB_READY", "data": {"device": "ide0-hd0", "len": 512, "offset":
> 512, "speed": 0, "type": "commit"}}
> {"execute":"block-job-complete","arguments":{"device":"ide0-hd0"}}
> {"return": {}}
> qemu-system-x86_64: block.c:2034: bdrv_swap: Assertion
> `bs_new->device_name[0] == '\0'' failed.
> Aborted (core dumped)
> 
> Attempts to commit-to-self should be rejected at block-commit time,
> rather than causing an assertion failure down the road.
>

Thanks... spinning a v6 to prevent this scenario.