"Ian Harding" <ianh(at)tpchd(dot)org> writes:
> psql in free(): warning: modified (chunk-) pointer.
> I am used to psql dumping core from time to time, although since upgrading to 7.3.1 it has not happened.
> Then this. Is it anything to fear?
It sure sounds like free() has detected something clobbering memory it
shouldn't --- at a guess, something overrunning a malloc'd buffer by a
few bytes. I'd recommend trying to trace the cause if you can. Is it
readily reproducible?
regards, tom lane