On Fri, Aug 24, 2007 at 11:00:05AM -0400, Agustin Schapira wrote:
> Hi Niels,
>
> Sorry for the late reply --I have been travelling.
>
> Thanks a lot for the fix. I'm glad that the bug was easy to find and
> correct. Which file should I change in the Mars-SuperBall
> distribution? Is it
> MonetDB4-server/MonetDB4/src/monet/monet_multiplex.mx
yep, that's the file.
Please let us konw, in case there are any problems with the patch --- I'm
not sure, whether there might have been other changes to this file in CVS
since the tarbaal was made.
> And then should I re-run the monetdb-install.sh script? By the way,
> is it possible to can have the script do all the make in a directory
> other than /tmp, so I can keep the intermediate files around and I
> don't have to recompile EVERYTHING whenever I make a change?
I'm not familiar at all with the monetdb-install.sh script, but Niels and/or
Fabian can probably help.
Stefan
> Thanks for the quick fix!
>
> -- Agustin
>
>
>
> >Hi Agustin,
> >
> >You found an interesting bug. The interpret_setaggr implementation has
> >indeed many cases. One set of cases uses an intermediate bat in
> >a strait forward (normal inserts) way. This case is the one you
> >trigger.
> >As soon as many values exist in your input bat the intermediate may
> >need extending which happens.
> >Now many of the other cases don't used the nested bat in such a
> >clean way, but do 'dirty' tricks, such as reusing the heaps of your
> >input
> >bat. Therefor at the end of interpret_setaggr the nested (bats) are
> >cleared by restoring the initial contend.
> >
> >As you can see restoring the 'initial' contend of the normal
> >inserts with
> >extends is a problem. I now have a fix for this which I hope to
> >check in
> >soon.
> >
> >
> >Index: monet_multiplex.mx
> >===================================================================
> >RCS file: /cvsroot/monetdb/MonetDB4/src/monet/monet_multiplex.mx,v
> >retrieving revision 1.4
> >diff -u -r1.4 monet_multiplex.mx
> >--- monet_multiplex.mx 20 Feb 2007 11:32:16 -0000 1.4
> >+++ monet_multiplex.mx 22 Aug 2007 19:06:44 -0000
> >@@ -1430,7 +1430,7 @@
> > BAT *b, *nested, *nested_rev, *histo = 0, *extent = 0, *ret
> >= 0;
> > size_t minpos;
> > int ret_val = -1, varsize, head_type, hidden_vartype = 0;
> >- int prop_key, prop_sorted = 0;
> >+ int prop_key, prop_sorted = 0, restore = 1;
> > GDKfcn direct_call = NULL, packed_call = NULL;
> > ValRecord argv_bak;
> > BUN p, q, r, s;
> >@@ -1688,6 +1688,7 @@
> > assert(batbuns->base!=(ptr)1);
> > nested->batDeleted = nested->batInserted = batbuns-
> >>base;
> >
> >+ restore = 0;
> > if (direct_call == NULL) {
> > if (GDKdebug & 131072)
> > THRprintf(GDKout, "setaggr impl:
> >non-optimized hash\n");
> >@@ -1814,8 +1815,16 @@
> > argv[1] = argv_bak;
> >
> > /* undo all our hacks in nested before freeing it */
> >- *(BATstore*) nested = nested_bak;
> >- *(BAT*) nested_rev = nested_rev_bak;
> >+ if (restore) {
> >+ *(BATstore*) nested = nested_bak;
> >+ *(BAT*) nested_rev = nested_rev_bak;
> >+ } else {
> >+ BATstore *n = (BATstore*)nested;
> >+ nested->H = &n->H;
> >+ nested->T = &n->T;
> >+ nested_rev->H = &n->T;
> >+ nested_rev->T = &n->H;
> >+ }
> > BBPreclaim(nested);
> >
> > if (ret_val < 0) {
> >
> >
> >
> >Niels
> >>
> >>I am having more difficulties with {sum} and {avg}. The problems
> >>happen both on 4.16.2 and 4.18.0, on Linux and OS X, compiled with
> >>32- and 64- bits, with and without optimizations.
> >>
> >>I have been able to isolate the problem and write a simple test case
> >>that shows the error. The attached file has the contents of a BAT; if
> >>you save it and then run the following script:
> >>
> >>module(ascii_io);
> >>var b:=bat(str,int).import(<filename>);
> >>var x:={sum}(b);
> >>
> >>then you will get the following error:
> >>
> >>*** glibc detected *** double free or corruption (!prev):
> >>0x00000000006a6360 ***
> >>
> >>and Monet will crash.
> >>
> >>The failing free is called from line 1819 of MonetDB4/src/monet/
> >>monet_multiplex.mx. It's inside the 'interpret_setaggr' function, and
> >>it happens only with the 'non-optimized hash' implementation of
> >>setaggr starting on line 1694 (in fact, if you sort the BAT before
> >>calling {sum}, there will be no error. The same is true for example
> >>when you call {count}, which uses a different implementation of
> >>setaggr to process the {}).
> >>
> >>The failing free appears within the 'bunins_failed' label (line
> >>1800), which in turn is called by the loop that processes the
> >>aggregate when, I think, its call to 'bunins_unary' fails. Here's the
> >>failing code, starting on line 1694:
> >>
> >> BATloopFast(extent, p, q, yy) {
> >> [...]
> >> if (BATprepareHash(b))
> >> goto bunins_failed;
> >> HASHloop(b, b->hhash, hh, last) {
> >> r = BUNptr(b, hh);
> >> @:bunins_unary(r,hh)@
> >> }
> >> [...]
> >> }
> >>
> >>I don't understand why @:bunins_unary(r,hh)@ should fail. I have
> >>noticed, however, that if I remove the last couple of lines from the
> >>attached file then the call to {sum} doesn't crash. These last two
> >>lines are exactly the same as others, so it's not their particular
> >>value that matters, but rather the number of rows in the BAT with the
> >>"Other" head value.
> >>
> >>Do you have any suggestions? Any other information that I can provide
> >>to help you fix the problem?
> >>
> >>Thanks a lot again,
> >>
> >>-- Agustin
> >>
> >>
> >>PS: On OS X, instead of the crash you get an error message "malloc:
> >>*** Deallocation of a pointer not malloced: 0x281ee00; This could be
> >>a double free(), or free() called with the middle of an allocated
> >>block", but for all practical purposes it's the same: the free() is
> >>called from the same place in interpret_setaggr. The difference is
> >>just in the way the Mac equivalent of glibc handles the double free.
> >>
> >
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> >
> >>
> >>
> >>
> >
> >>---------------------------------------------------------------------
> >>----
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> >>Now Search log events and configuration files using AJAX and a
> >>browser.
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> >>_______________________________________________
> >>Monetdb-developers mailing list
> >>[email protected]
> >>https://lists.sourceforge.net/lists/listinfo/monetdb-developers
> >
> >
> >--
> >
> >Niels Nes, Centre for Mathematics and Computer Science (CWI)
> >Kruislaan 413, 1098 SJ Amsterdam, The Netherlands
> >room C0.02, phone ++31 20 592-4098, fax ++31 20 592-4312
> >url: http://www.cwi.nl/~niels e-mail: [EMAIL PROTECTED]
--
| Dr. Stefan Manegold | mailto:[EMAIL PROTECTED] |
| CWI, P.O.Box 94079 | http://www.cwi.nl/~manegold/ |
| 1090 GB Amsterdam | Tel.: +31 (20) 592-4212 |
| The Netherlands | Fax : +31 (20) 592-4312 |
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