strange memory leak (in ldb?)

[Stefan (metze) Metzmacher]

Hi Tridge,

I noticed that we have seem to have a memory leak somewhere...

I have the following setup a domain with ~ 20000 objects (users, groups,
computers).

When I start 'samba' the heap looks fine.

full talloc report on 'null_context' (total 1287675 bytes in 31491 blocks)
...

while the heap section is /proc/<pid>/smaps looks like this:

00612000-01fb4000 rw-p 00000000 00:00 0
 [heap]
Size:              26248 kB
Rss:               26092 kB
Pss:               13332 kB
Shared_Clean:          0 kB
Shared_Dirty:      25520 kB
Private_Clean:         0 kB
Private_Dirty:       572 kB
Referenced:        26092 kB
Swap:                  0 kB
KernelPageSize:        4 kB
MMUPageSize:           4 kB

After doing an DRS-RPC-DSSYNC against samba / or letting a windows dc
replicate from us.

It looks like:

full talloc report on 'null_context' (total 1293104 bytes in 31552 blocks)
... (not much different, there're small leaks I'm currently fixing)

But the heap looks like this now:

00612000-20854000 rw-p 00000000 00:00 0
 [heap]
Size:             526600 kB
Rss:              526568 kB
Pss:              524624 kB
Shared_Clean:          0 kB
Shared_Dirty:       3888 kB
Private_Clean:         0 kB
Private_Dirty:    522680 kB
Referenced:       526568 kB
Swap:                  0 kB
KernelPageSize:        4 kB
MMUPageSize:           4 kB

About 20x more than before the replication.

I think I had something similar in our wins server, when replication a
large database
and the leak was triggered by ldb_search(), but I never figured out why.
Eevent valgrind's massif didn't help to track it down.

Do you have any idea what the problem is, maybe a glibc malloc bug?

metze

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 262 bytes
Desc: OpenPGP digital signature
URL: <http://lists.samba.org/pipermail/samba-technical/attachments/20101104/69ae5992/attachment.pgp>