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Kevin noted how the part of stream_run() that is after the for loop runs with s->common.busy = false. At least bdrv_change_backing_file() can yield, possibly other functions, too.

The race window is really small but it's there.  We can extend the implementation of block_job_cancel_sync so that the race can be fixed easily.

The same patches help fixing the case where the target of a mirroring job fails during block_job_cancel_sync, as suggested by Marcelo.

[To qa: it is very hard to cover these particular cases with tests, but the streaming and mirroring tests---for example switching mirroring to the target, and quit during streaming---will ensure that the code works well].

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NEEDINFO

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2012-0746.html