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rpc: Avoid deadlock when closing client connection

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We need to drop the server lock before calling virObjectUnlock(client)
since in case we had the last reference to the client, its dispose
callback would be called and that could possibly try to lock the server
and cause a deadlock. This is exactly what happens when there is only
one QEMU domain running and it is marked to be autodestroyed when the
connection dies. This results in qemuProcessAutoDestroy ->
qemuProcessStop -> virNetServerRemoveShutdownInhibition call sequence,
where the last function locks the server.
This commit is contained in:
Jiri Denemark 2013-02-18 15:10:04 +01:00
parent ee1d6d91d1
commit 921af42980
1 changed files with 5 additions and 1 deletions
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6
src/rpc/virnetserver.c
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@ -1120,7 +1120,7 @@ void virNetServerRun(virNetServerPtr srv)
if (virNetServerClientWantClose(srv->clients[i]))
virNetServerClientClose(srv->clients[i]);
if (virNetServerClientIsClosed(srv->clients[i])) {
virObjectUnref(srv->clients[i]);
virNetServerClientPtr client = srv->clients[i];
if (srv->nclients > 1) {
memmove(srv->clients + i,
srv->clients + i + 1,
@ -1131,6 +1131,10 @@ void virNetServerRun(virNetServerPtr srv)
srv->nclients = 0;
}
virObjectUnlock(srv);
virObjectUnref(client);
virObjectLock(srv);
goto reprocess;
}
}