Re: [Fwd: PGBuildfarm member narwhal Branch HEAD Status changed from OK to InstallCheck failure]

Tom Lane wrote:
> Dave Page <dpage(at)postgresql(dot)org> writes:
>> I've been seeing this failure intermittently on Narwhal HEAD, and once
>> on 8.1. Other branches have been OK, as have other animals running on
>> the same physical box. Narwhal-HEAD is run more often than any other
>> builds however.
>
>> Anyone have any idea what might be wrong? It seems unlikely to be a
>> hardware issue given that it's the exact same test failures each time.
>
> Yeah, I'd been wondering about that too, but have no clue what's up.
> It seems particularly odd that all the failures are in installcheck
> not check.
>
> If you want to poke at it, I'd suggest changing the ERROR to PANIC
> (it's in bufmgr.c) to cause a core dump, run installchecks till you
> get a panic, and then look around in the dump to see what you can find.
> It'd be particularly interesting to see what the buffer actually
> contains. Also you could look at the corresponding page of the disk
> file (which in theory should be the same as the buffer contents,
> since this error check is only made just after a read() ...)

Hmm, I'll give it a go when I'm back in the office, but bear in mind
this is a Mingw build on which debugging is nigh-on impossible.

Regards, Dave.