Ceph » Linux kernel client

After unmounting my Ceph filesystem and removing my kernel module i got the following message:

[  167.227965] ceph: loaded (mon/mds/osd proto 15/32/24, osdmap 5/5 5/5)
[  167.236804] ceph: client4098 fsid 94b87913-0b1c-9aba-5717-232aea46dc59
[  167.237265] ceph: mon0 192.168.6.209:6789 session established
[  239.958014] =============================================================================
[  239.958112] BUG ceph_dentry_info: Objects remaining on kmem_cache_close()
[  239.958195] -----------------------------------------------------------------------------
[  239.958196] 
[  239.958343] INFO: Slab 0xffffea0000dec228 objects=51 used=1 fp=0xffff88003fa53fa0 flags=0x100000000000080
[  239.958441] Pid: 1335, comm: rmmod Not tainted 2.6.34-020634-generic #020634
[  239.958444] Call Trace:
[  239.958457]  [<ffffffff8112eea2>] slab_err+0xb2/0xe0
[  239.958466]  [<ffffffff81009928>] ? __switch_to+0x188/0x2e0
[  239.958473]  [<ffffffff81051af6>] ? finish_task_switch+0x66/0xd0
[  239.958478]  [<ffffffff811320c0>] ? flush_cpu_slab+0x0/0x60
[  239.958484]  [<ffffffff81094de8>] ? smp_call_function_single+0x148/0x150
[  239.958488]  [<ffffffff811320c0>] ? flush_cpu_slab+0x0/0x60
[  239.958492]  [<ffffffff811305b9>] list_slab_objects+0xb9/0x1d0
[  239.958497]  [<ffffffff81136367>] ? pcpu_chunk_slot+0x27/0x30
[  239.958501]  [<ffffffff81131fa9>] free_partial+0xa9/0xd0
[  239.958505]  [<ffffffff811327de>] kmem_cache_destroy+0xae/0x160
[  239.958520]  [<ffffffffa01c0e4d>] destroy_caches+0x2d/0x40 [ceph]
[  239.958528]  [<ffffffffa01e962b>] exit_ceph+0x1f/0x2b [ceph]
[  239.958534]  [<ffffffff810988c6>] sys_delete_module+0x166/0x1f0
[  239.958539]  [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b
[  239.958550] INFO: Object 0xffff88003fa53000 @offset=0
[  239.958628] SLUB ceph_dentry_info: kmem_cache_destroy called for cache that still has objects.
[  239.958719] Pid: 1335, comm: rmmod Not tainted 2.6.34-020634-generic #020634
[  239.958721] Call Trace:
[  239.958725]  [<ffffffff81132878>] kmem_cache_destroy+0x148/0x160
[  239.958732]  [<ffffffffa01c0e4d>] destroy_caches+0x2d/0x40 [ceph]
[  239.958740]  [<ffffffffa01e962b>] exit_ceph+0x1f/0x2b [ceph]
[  239.958744]  [<ffffffff810988c6>] sys_delete_module+0x166/0x1f0
[  239.958749]  [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b

I'm running the latest "unstable" of the ceph-client with a 2.6.34 final kernel.

On my Ceph filesystem i was unpacking the Linux kernel and removing it again.

It seems there is some memory which isn't cleaned up properly after a unmount?