Re: Some 9.5beta2 backend processes not terminating properly?

Hi,

On 2015-12-30 13:17:47 -0500, Tom Lane wrote:
> Andres Freund <andres(at)anarazel(dot)de> writes:
> > On 2015-12-30 19:54:19 +0200, Shay Rojansky wrote:
> >> wakeEvents is 8387808 and so is sock.
>
> > Hm. That seems like an extremely weird value.
>
> Probably just means the debugger is confused by optimized code.

Yea.

> > I think it's indicative of
> > a bug in 80788a431e. Specifically secure_read/write's waitfor isn't
> > necessarily set in the ssl case. Importantly not in the
> > SSL_ERROR_SYSCALL case, which we're likely hitting here.
>
> Hmm, that does look bogus ... and the Assert wouldn't fire in a non-assert
> build.

After a bit of thinking it seems this can't actually happen because
waitfor is only used if errno is EWOULDBLOCK/EAGAIN. And all the other
branches allowing for n < 0 set errno to a different value. Not
particularly obvious.

> > Is this in a backend with ssl?
>
> I thought we'd eliminated SSL already, or have I lost track of the
> bidding?

We know a very similar problem happens without ssl. But we could have
ended up two different bugs...

Andres