Bad interaction between elog and postmaster.c (6.4.2)

Hi there,
The bug that I reported which was causing the backend and all its
children to hang when an accept() on an incoming connection fails turns out to
because of elog()'s side effect of sending SIGQUIT to the backend. This causes
the children to be sent signals while SIGCHLD is blocked (to prevent race's).
This seems to hang the backend forever.

I was going to check 6.5 before I sent this but I don't have enough time just
now, my aplogies for this.

A simple hack around is to remove the elog() when an accept fails.

This is redesigned in 6.5.

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