[Ocfs2-devel] Memory leak in ocfs2/dlm?

[Jan-Benedict Glaw]

Hi!

Seems we're facing some memory leak here. This is vanilla 2.6.19-rc6
on a x86_64 box, 4GB RAM.

A simple `ls -Rn' on a filesystem with lots of files makes the box
leak so much RAM that the OOM killer starts to kick in. With slab
alloc debugging turned on, we see this:

# mount; ls -Rn; wait some seconds; Ctrl-C

[root at lnxp-1038:/backend1]$ cat /proc/slab_allocators | egrep '(size.512|ocfs2_inode_cache)' | grep ocfs | sort -k 2 -n
size-512: 1 o2hb_heartbeat_group_make_item+0x1b/0x79 [ocfs2_nodemanager]
size-512: 1 o2hb_map_slot_data+0x22/0x2fa [ocfs2_nodemanager]
size-512: 1 ocfs2_initialize_super+0x55e/0xd7f [ocfs2]
size-512: 26439 ocfs2_dentry_attach_lock+0x2d1/0x423 [ocfs2]
ocfs2_inode_cache: 26450 ocfs2_alloc_inode+0x13/0x29 [ocfs2]
size-512: 52879 dlm_new_lockres+0x22/0x189 [ocfs2_dlm]

# Clear caches

[root at lnxp-1038:/mail/store/backend1]$ echo 3 > /proc/sys/vm/drop_caches 
[root at lnxp-1038:/mail/store/backend1]$ echo 0 > /proc/sys/vm/drop_caches 

[root at lnxp-1038:/backend1]$ cat /proc/slab_allocators | egrep '(size.512|ocfs2_inode_cache)' | grep ocfs | sort -k 2 -n
size-512: 1 o2hb_heartbeat_group_make_item+0x1b/0x79 [ocfs2_nodemanager]
size-512: 1 o2hb_map_slot_data+0x22/0x2fa [ocfs2_nodemanager]
size-512: 1 ocfs2_initialize_super+0x55e/0xd7f [ocfs2]
size-512: 9 ocfs2_dentry_attach_lock+0x2d1/0x423 [ocfs2]
ocfs2_inode_cache: 20 ocfs2_alloc_inode+0x13/0x29 [ocfs2]
size-512: 52379 dlm_new_lockres+0x22/0x189 [ocfs2_dlm]

Anything known about this?

Thanks, JBG

-- 
Telefónica Deutschland GmbH     | Jan-Benedict Glaw
Hülshorstweg 30                 | Configuration Management
33415 Verl                      | Email: <jbglaw at telefonica.de>
http://www.telefonica.de/       | Tel.: +49-5246-80-1869

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