Please try disabling I/O limits on the drive and try again.

Is there anything else I could try?


I've captured trace of hanged VM with following events traced:

bdrv_*
paio_*
thread_pool_*
commit_*
qcow2_*

and debug code that prints requests from traced_requests in bdrv_requests_pending function.

It's available here: http://filebin.net/tmscfay2pa/hanged-trace.gz (50mb after decompression)

--
mg

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