#5278: On modern fedora 64 installs, sage exists frequently when omalloc thinks
there is no memory left
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Reporter: was | Owner: cwitty
Type: defect | Status: new
Priority: blocker | Milestone: sage-3.3
Component: misc | Resolution:
Keywords: |
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Comment (by was):
> Also, if it thinks it's trying to allocate memory using sbrk,
> it may also think that it can free memory using sbrk, so this
> might have introduced a memory leak. (If so, it may still be
> a good temporary fix... memory leaks are better than immediate crashes,
IMHO.)
Singular fails on a call to the OM_MALLOC_FROM_SYSTEM macro. That macro
is -- as the name suggests -- just supposed to be malloc *not* sbrk. And,
if you just look at the source you see:
{{{
#define OM_MALLOC_FROM_SYSTEM OM_MALLOC_MALLOC
}}}
and in some places
{{{
#define OM_MALLOC_MALLOC malloc
}}}
but in other places:
{{{
#define OM_MALLOC_MALLOC mALLOc
}}}
And mALLOc is define internally in various places to be
{{{
dlmalloc.h:#define mALLOc __libc_malloc
dlmalloc.h:#define mALLOc malloc
}}}
but it never has anything whatever to do with sbrk as far as I can tell.
I'm actually puzzled since reading the source it seems to me that
OM_MALLOC_FROM_SYSTEM should just be malloc. However, obviously it isn't
or my hack wouldn't fix the problem. Notice that using
OM_MALLOC_FROM_SYSTEM instead of malloc again in my hack does *not* fix
the problem.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5278#comment:5>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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