[RTEMS Project] #3755: leak in realloc

RTEMS trac trac at rtems.org
Wed Jul 31 00:10:57 UTC 2019

#3755: leak in realloc
 Reporter:  Jeffrey Hill  |       Owner:  (none)
     Type:  defect        |      Status:  new
 Priority:  normal        |   Milestone:
Component:  score         |     Version:  4.11
 Severity:  normal        |  Resolution:
 Keywords:  realloc leak  |  Blocked By:
 Blocking:                |

Comment (by Jeffrey Hill):

 I noticed last week that the EPICS shell function for displaying the
 "heapSpace" is implemented as follows. Furthermore, peaking in the score
 area I can see perhaps that the protected heap methods do ''not'' update
 the lifetime_allocated and lifetime_freed when realloc is called. So this
 might be indicate that the issues was observed due to weaknesses in our
 instrumentation. Whether the instrumentation issues is in EPICS our RTEMS
 is matter for further discussion :-). We have isolated another leak which
 is currently known now to be with the EPICS save/restore facility, or more
 likely in the RTEMS NFS client. When I get that one knocked out then I
 will try returning the original Lua allocator, calling realloc, and see if
 this issue was a false positive due to instrumentation error.

     Heap_Information_block info;
     malloc_info( &info );
     x = info.Stats.size - (unsigned long)(info.Stats.lifetime_allocated -

Ticket URL: <http://devel.rtems.org/ticket/3755#comment:13>
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