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daacf36645
Dragan Dosen found that the listeners lock is not sufficient to protect the listeners list when proxies are stopping because the listeners are also unlinked from the protocol list, and under certain situations like bombing with soft-stop signals or shutting down many frontends in parallel from multiple CLI connections, it could be possible to provoke multiple instances of delete_listener() to be called in parallel for different listeners, thus corrupting the protocol lists. Such operations are pretty rare, they are performed once per proxy upon startup and once per proxy on shut down. Thus there is no point trying to optimize anything and we can use a global lock to protect the protocol lists during these manipulations. This fix (or a variant) will have to be backported as far as 1.8. |
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