[ET Trac] [Einstein Toolkit] #1432: CarpetLib::poison_new_memory when aligning memory

Einstein Toolkit trac-noreply at einsteintoolkit.org
Wed Sep 4 15:02:08 CDT 2013

#1432: CarpetLib::poison_new_memory when aligning memory
 Reporter:  rhaas   |       Owner:  eschnett           
     Type:  defect  |      Status:  new                
 Priority:  major   |   Milestone:                     
Component:  Carpet  |     Version:  development version
 Keywords:          |  
 looking at the poison code in CarpetLib's mem.cc it seems to me that the
 poisoning cdoe uses the wrong data pointer ie uses line 144 of mem.cc:
     total_allocated_bytes += nbytes;
     max_allocated_bytes = max (max_allocated_bytes,
     if (poison_new_memory) {
       memset (storage_, poison_value, nbytes);
 when in fact I think it should be {{{storage_base_}}} since this is the
 pointer to nbytes bytes of memory returned by malloc.

 Attached please find a patch which tries to address this. Note that this
 only matters on systems where the vector lenght is large enough so that
 the "natural" alignment provided by malloc (at least 4 bytes I'd assume
 more likely actually 8 bytes).

Ticket URL: <https://trac.einsteintoolkit.org/ticket/1432>
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