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Re: [Samba] possible memory leak in ldb module while dbcheck on RODC




Hai Andrej, 

Oeps, Sorry, my mistake 4.6.x needs at least 1.1.29. 

But you can upgrade to 4.6.x ;-) 

Check again and if that problem then still exists, 
then i think you can better ask this one in the samba-technical list. 
Or if Rowland knows something more about this. 

One tip, wait untill tomorrow or the weekend, there wil be a new release due to the regression bug. 
There planning is to be release today. 


Louis


> -----Oorspronkelijk bericht-----
> Van: Andrej Gessel [mailto:Andrej.Gessel@xxxxxxxxxxx]
> Verzonden: vrijdag 31 maart 2017 9:11
> Aan: L.P.H. van Belle; samba@xxxxxxxxxxxxxxx
> Onderwerp: AW: [Samba] possible memory leak in ldb module while dbcheck on
> RODC
> 
> Hello,
> 
> i just checkout git repository and run
> # ./configure.develorer
> # make
> # make install
> 
> As i can read from lib/ldb/wscript it is version 1.1.27?
> 
> How can i change to the version 1.1.29?
> 
> Regards,
> 
> Andrej
> 
> 
> -----Ursprüngliche Nachricht-----
> Von: samba [mailto:samba-bounces@xxxxxxxxxxxxxxx] Im Auftrag von L.P.H.
> van Belle via samba
> Gesendet: Freitag, 31. März 2017 09:03
> An: samba@xxxxxxxxxxxxxxx
> Betreff: Re: [Samba] possible memory leak in ldb module while dbcheck on
> RODC
> 
> What is the ldb version your using?
> You need : 1.1.29 with samba 4.5.7.
> 
> Greetz,
> 
> Louis
> 
> 
> > -----Oorspronkelijk bericht-----
> > Van: samba [mailto:samba-bounces@xxxxxxxxxxxxxxx] Namens Andrej Gessel
> > via samba
> > Verzonden: vrijdag 31 maart 2017 8:55
> > Aan: samba@xxxxxxxxxxxxxxx
> > Onderwerp: Re: [Samba] possible memory leak in ldb module while
> > dbcheck on RODC
> >
> > Hello,
> >
> > my message was not send with my attachment, because content-type was
> > not allowed,  sorry for that.
> >
> > i am trying to use Samba 4.5.7 as an RODC and maybe found a memory
> > leak in ldb module.
> >
> > There is an known BUG https://bugzilla.samba.org/show_bug.cgi?id=11178
> > and a known fix in dbcheck.
> >
> > If i run "samba-tool dbcheck --cross-ncs --fix", this running process
> > starts with ~300MB and use at the end about 1,6GB of memory on test
> > domain with 15000 users and 15000 groups(ntds.dit is only ~150MB). I
> > tried to find out why it is increasing continuously.
> >
> >
> > 1) I used memory_profiler and modified dbchecker.py:
> >
> > root@buildhost samba # git diff dbchecker.py diff --git a/dbchecker.py
> > b/dbchecker.py index 032c0e7..6fe0d4d 100644
> > --- a/dbchecker.py
> > +++ b/dbchecker.py
> > @@ -17,6 +17,7 @@
> > # along with this program.  If not, see <http://www.gnu.org/licenses/>.
> > #
> >
> > +from memory_profiler import profile
> > import ldb
> > import samba
> > import time
> > @@ -356,6 +357,7 @@ systemFlags: -1946157056%s""" % (dn, guid_suffix),
> >              return False
> >          return True
> >
> > +    @profile
> >      def do_modify(self, m, controls, msg, validate=True):
> >          '''perform a modify with optional verbose output'''
> >          if self.verbose:
> > @@ -751,6 +753,7 @@ newSuperior: %s""" % (str(from_dn), str(to_rdn),
> > str(to_base)))
> >                            "Failed to rename object %s into %s" %
> > (obj.dn,
> > new_dn)):
> >              self.report("Renamed %s into %s" % (obj.dn, new_dn))
> >
> > +    @profile
> >      def err_wrong_instancetype(self, obj, calculated_instancetype):
> >          '''handle a wrong instanceType'''
> >          self.report("ERROR: wrong instanceType %s on %s, should be
> > %d" % (obj["instanceType"], obj.dn, calculated_instancetype)) @@
> > -1541,6 +1544,7 @@ newSuperior: %s""" % (str(from_dn), str(to_rdn),
> > str(to_base)))
> >
> >          raise KeyError
> >
> > +    @profile(precision=4)
> >      def check_object(self, dn, attrs=['*']):
> >          '''check one object'''
> >          if self.verbose:
> >
> > Output of memory_profiler shows me additional ~2MB of memory usage
> > after every run of check_object function (show memory_profiler.txt for
> > details partial, because of mailing list limits).
> >
> > 2) After i comment out the line in dbchecker.py, memory is not
> > increasing anymore.
> >
> > @@ -356,13 +357,14 @@ systemFlags: -1946157056%s""" % (dn, guid_suffix),
> >              return False
> >          return True
> >
> > +    @profile
> >      def do_modify(self, m, controls, msg, validate=True):
> >          '''perform a modify with optional verbose output'''
> >          if self.verbose:
> >              self.report(self.samdb.write_ldif(m,
> ldb.CHANGETYPE_MODIFY))
> >          try:
> >              controls = controls + ["local_oid:%s:0" %
> > dsdb.DSDB_CONTROL_DBCHECK]
> > -            self.samdb.modify(m, controls=controls, validate=validate)
> > +#            self.samdb.modify(m, controls=controls, validate=validate)
> >          except Exception, err:
> >             if self.in_transaction:
> >                  raise CommandError("%s : %s" % (msg, err))
> >
> >
> >
> > 3) My first idea was that it is python problem with starting c
> > modules, but then i found pyldb.c and py_ldb_modify function in it.
> > Commenting out the line with ldb_request memory stays on the same
> > value and does not increase anymore.
> >
> > root@buildhost samba (git)-[samba-4.5.7] # git diff lib/ldb/pyldb.c
> > diff --git a/lib/ldb/pyldb.c b/lib/ldb/pyldb.c index bea837f..ed5309a
> > 100644
> > --- a/lib/ldb/pyldb.c
> > +++ b/lib/ldb/pyldb.c
> > @@ -1255,7 +1255,7 @@ static PyObject *py_ldb_modify(PyLdbObject
> > *self, PyObject *args, PyObject *kwar
> >                 return NULL;
> >         }
> >
> > -       ret = ldb_request(ldb_ctx, req);
> > +       //ret = ldb_request(ldb_ctx, req);
> >         if (ret == LDB_SUCCESS) {
> >                 ret = ldb_wait(req->handle, LDB_WAIT_ALL);
> >         }
> >
> >
> >
> > So now to my question:
> > Is it really a bug or does ldb library do something, that i did not
> > see/understand till now?
> >
> >
> > regards,
> >
> > Andrej
> >
> > Von: samba [mailto:samba-bounces@xxxxxxxxxxxxxxx] Im Auftrag von
> > Andrej Gessel via samba
> > Gesendet: Donnerstag, 30. März 2017 23:33
> > An: samba@xxxxxxxxxxxxxxx
> > Betreff: [Samba] possible memory leak in ldb module while dbcheck on
> > RODC
> >
> >
> > --
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> 
> 
> 
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