while fixing and debugging virNetSocketNewListenTCP in master, I had
breakpoints in virNetSocketNewListenTCP and virNetSocketNew. After
starting a migration the receiving libvirtd went into both functions. I
hit continue a 4 times, but forgot to do it for the fifth call to let it
proceed. libvirtd was stuck there for a long time.

As a result, when leaving virNetSocketNew, I got a crash in
libxlDoMigrateDstReceive -> libxlDomainStartRestore -> libxlDomainStart
because args->conn->privateData is NULL. This means 'driver' becomes
NULL and things fall apart.

I have no checked where privateData is set. I think some place should
catch the broken connection and stop the incoming migration.


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