Re: [patch] Support LLVM 7

On 2018-09-20 15:18:14 +0200, Christoph Berg wrote:
> Re: To Andres Freund 2018-09-20 <20180920081044.GA16897@msg.df7cb.de>
> > > > 2018-09-15 10:49:25.052 UTC [26458] DETAIL:  Failed process was running: SELECT '' AS tf_12, BOOLTBL1.*,
BOOLTBL2.*
> > > >        FROM BOOLTBL1, BOOLTBL2
> > > >        WHERE BOOLTBL2.f1 <> BOOLTBL1.f1;
> > > > 2018-09-15 10:49:25.052 UTC [26458] LOG:  terminating any other active server processes
> > > 
> > > Hm. Is there any chance to get a backtrace for this one?  This could,
> > > although I think less likely so, also be a postgres issue
> > > (e.g. generating code for the wrong microarch).
> > 
> > I'll see if I can find a porterbox to get a backtrace.

Hm, this is pretty helpful.  Sorry to ask, but could you a) turn on
jit_debugging_support (connection start) b) jit_dump_bitcode.

Then reproduce again.  After that, it'd be helpful to get:
1) /proc/cpuinfo
2) the "newest" *.bc file from the data directory
3) a backtrace
4) gdb disassemble at the point of the error.

Greetings,

Andres Freund