Re: There's some sort of race condition with the new FSM stuff

From: Zdenek Kotala <Zdenek(dot)Kotala(at)Sun(dot)COM>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, pgsql-hackers(at)postgresql(dot)org, books(at)ejurka(dot)com
Subject: Re: There's some sort of race condition with the new FSM stuff
Date: 2008-10-14 16:09:27
Message-ID: 48F4C437.7060909@sun.com
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Tom Lane napsal(a):
> Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> writes:
>> I still wonder, though, why we're seeing the error consistently on kudu,
>> and not on any other animal. Perhaps the forknum field that's left
>> uninitialized gets a different value there than on other platforms.
>
> Hmm ... AFAICS this mistake would mean that no forknum field of the
> requests[] array ever gets set at all, so they would stay at whatever
> the virgin value in the shmem segment had been. Perhaps Solaris doesn't
> guarantee that a shared memory block starts out as zeroes?

For security reason any OS should clean memory pages before process
first touches them.

Zdenek

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