Re: [HACKERS] jacana hung after failing to acquire random number

On Sun, Dec 11, 2016 at 9:06 AM, Andrew Dunstan <andrew@dunslane.net> wrote:
>
> jascana (mingw, 64 bit compiler, no openssl) is currently hung on "make
> check". After starting the autovacuum launcher there are 120 messages on its
> log about "Could not acquire random number". Then nothing.
>
>
> So I suspect the problem here is commit
> fe0a0b5993dfe24e4b3bcf52fa64ff41a444b8f1, although I haven't looked in
> detail.
>
>
> Shouldn't we want the postmaster to shut down if it's not going to go
> further? Note that frogmouth, also mingw, which builds with openssl, doesn't
> have this issue.

Did you unlock it in some way at the end? Here is the shape of the
report for others:
http://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=jacana&dt=2016-12-10%2022%3A00%3A15
And here is of course the interesting bit:
2016-12-10 17:25:38.822 EST [584c80e2.ddc:2] LOG:  could not acquire
random number
2016-12-10 17:25:39.869 EST [584c80e2.ddc:3] LOG:  could not acquire
random number
2016-12-10 17:25:40.916 EST [584c80e2.ddc:4] LOG:  could not acquire
random number

I am not seeing any problems with MSVC without openssl, so that's a
problem proper to MinGW. I am getting to wonder if it is actually a
good idea to cache the crypt context and then re-use it. Using a new
context all the time is definitely not performance-wise though. A
second difference are the missing CRYPT_MACHINE_KEYSET and
CRYP_NEWKEYSET. So, with something like the patch attached, do you see
improvements? What this patch does is to use a different context at
each call, and with the key container flags to allow proper access to
it (as there are winxp-only limitations here). I have tried to compile
with MinGW in my environment but my gcc compiler keep crashing, so I
cannot reproduce directly the problem I am afraid.
-- 
Michael

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