> This is a fairly spectacular failure :-(.  As far as I can see from the
> semctl and shmctl man pages, the only plausible reason for EINVAL is
> that something had deleted the semaphores and shared memory out from
> under Postgres.  I do not believe that Postgres itself could have done
> that --- it had to be some external agency.  Unless the kernel is
> broken, whatever requested those deletions had to be running as root or
> as postgres in order to have the necessary permissions.  You sure you
> didn't have some loose-cannon script running around issuing ipcrm
> commands?

Or ipcclean?


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