[m-rev.] for review: revert HBLKSIZE increase on linux

[Peter Wang]

On 2011-04-28, Peter Wang <novalazy at gmail.com> wrote:
> On 2011-04-28, Paul Bone <pbone at csse.unimelb.edu.au> wrote:
> > On Wed, Apr 27, 2011 at 02:21:09PM +1000, Peter Wang wrote:
> > > For review by Paul.  This might be required on the release branch as well.
> > > 
> > > Branches: main
> > > 
> > > Revert custom increase to HBLKSIZE in parallel grades on Linux.
> > > It was already reverted on other systems due to problems with it not working.
> > > 
> > > In asm_fast.par.gc and hlc.par.gc grades on 64-bit Linux, I am getting
> > > aborts when GC_free is called:
> > > 
> > > Duplicate large block deallocation of 0x7f2769f10000
> > 
> > Can you show that this error is due to this configuration change?
> 
> It's very strange.  I've only seen it with my memory attribution patch
> applied, in asm_fast.par.gc and hlc.par.gc grades (note: no profiling).

I can also reproduce it like this:

    ./configure --enable-gc-munmap
    cd boehm_gc
    mmake -j4 GRADE=asm_fast.par.gc GC_GRADE=par_gc
    gcc t1.c libpar_gc.a -lpthread
    % ./a.out
    Duplicate large block deallocation of 0x7ff8e6e80000
    Duplicate large block deallocation
    zsh: abort      ./a.out

The program t1.c is simply:

    #include "gc.h"

    int main(void)
    {
	GC_init();
	GC_free(GC_malloc(1));
	return 0;
    }

Peter
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