From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dietmar Hahn <dietmar.hahn@ts.fujitsu.com>
Subject: Wrong cpupool handling
Date: Tue, 11 Nov 2014 13:18:48 +0100
Message-ID: <19147765.FEreuxd8Ya@amur>
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Cc: jgross@suse.com
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Hi list,

When creating a cpupool, starting and destroying a guest within this pool,
then removing this pool doesn't work because of EBUSY.

It seems the cause of this behavior is the commit
bac6334b51d9bcfe57ecf4a4cb5288348fcf044a.

In domain_kill() the function sched_move_domain() gets called changing the
d->cpupool pointer to the new cpupool without incrementing/decrementing the
counters "n_dom" of the new/old cpupool.

This leads to decrementing the wrong  cpupool0->n_dom counter when
cpupool_rm_domain() gets called at the end and my own cpupool can't be
destroyed because n_dom = 1!

I don't have a fast patch because I'am not enough familiar with the code
this time but I think it should be fixed for 4.5.

Dietmar.


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