[Developers] memory error in src/main/Parameter.c's GetBaseName()

Thomas Radke tradke at aei.mpg.de
Fri Feb 29 05:09:31 CST 2008

David Rideout wrote:
> Hi,
> I have a code which runs fine in serial, but seg faults while freeing
> grid arrays when run in parallel.  When I run it with memory checking
> in ddt, it shows an error at the malloc() call in GetBaseName()
> (src/main/Parameters.c line 2374):
> Processes 0-1:
> Memory error detected: "a previous write overwrote the reserved memory
> after the end of a memory allocation"
> This call to GetBaseName() arises from a call to CCTK_ParameterData()
> during BASEGRID, to get the size of an array parameter.
> Any ideas??

I can't see anything wrong in the calling stack CCTK_ParameterData() -> 
ParameterFind() -> GetBaseName().

Like Erik, I would suspect a memory corruption earlier in the run. Do 
your grid arrays maybe have a size of 0 on some processors, and there is 
code not checking for that ?

Cheers, Thomas.

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