[linux-cifs-client] Oops umount cifs linux-2.6.32.5

[Alexey Talikov]

Hello

When I tried to umount  CIFS share (server is samba 3.4.4) it prints on 
console
sudo umount /mnt/home/
This utility only unmounts cifs filesystems.

If I just mount and if no information was transfered from the share it 
can be umount cleanly.
To reproduce mount CIFS share, do at list ls on it then try to umount it.

Here is the oops message
BUG: Dentry f1d0d770{i=2,n=/} still in use (1) [unmount of cifs cifs]
------------[ cut here ]------------
kernel BUG at fs/dcache.c:670!
invalid opcode: 0000 [#1] SMP
last sysfs file: /sys/module/iscsi_trgt/refcnt
Modules linked in: nls_utf8 cifs cpufreq_conservative nfsd exportfs nfs 
lockd nfs_acl auth_rpcgss sunrpc crc32c bridge stp llc 
snd_hda_codec_atihdmi ata_generic pata_atiixp snd_hda_codec_realtek 
ohci_hcd ide_pci_generic snd_hda_intel ohci1394 8250_pnp 8250 
serial_core snd_hda_codec snd_pcm snd_timer ieee1394 r8169 mii snd 
soundcore snd_page_alloc skge atiixp tun ehci_hcd ide_core usbcore 
kvm_amd kvm it87 hwmon_vid hwmon loop fuse powernow_k8 processor ext3 
jbd mbcache sd_mod ahci libata [last unloaded: iscsi_trgt]

Pid: 12214, comm: umount.cifs Not tainted (2.6.32-ARCH #1) GA-MA78GM-UD2H
EIP: 0060:[<c10aa0db>] EFLAGS: 00010282 CPU: 1
EIP is at shrink_dcache_for_umount_subtree+0x1db/0x1f0
EAX: 0000004c EBX: f1d0d770 ECX: f6f0bf10 EDX: c1290030
ESI: f1d0d7cc EDI: 00000001 EBP: f8f4118a ESP: f6f0bf0c
  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Process umount.cifs (pid: 12214, ti=f6f0a000 task=f6e2dd00 task.ti=f6f0a000)
Stack:
  c1290030 f1d0d770 00000002 f1d0d7cc 00000001 f8f4118a f74a9564 f74a9400
<0> f8f3e0e0 c10d41e0 f764ec18 c10aa115 f74a9400 c109b3d6 c10af5cf c110c419
<0> 00000011 f8f4c540 c109b4d9 f74a9400 c109bbc7 00000000 f6e2dd00 f74a9400
Call Trace:
  [<c10d41e0>] ? vfs_quota_off+0x0/0x10
  [<c10aa115>] ? shrink_dcache_for_umount+0x25/0x40
  [<c109b3d6>] ? generic_shutdown_super+0x16/0xd0
  [<c10af5cf>] ? mntput_no_expire+0x6f/0xc0
  [<c110c419>] ? _atomic_dec_and_lock+0x59/0x80
  [<c109b4d9>] ? kill_anon_super+0x9/0x40
  [<c109bbc7>] ? deactivate_super+0x57/0x90
  [<c10af8e7>] ? sys_umount+0x57/0x360
  [<c1002e08>] ? sysenter_do_call+0x12/0x26
Code: 20 81 c2 64 01 00 00 89 6c 24 14 89 7c 24 10 89 54 24 18 89 74 24 
0c 89 5c 24 04 89 44 24 08 c7 04 24 30 00 29 c1 e8 b3 8c 17 00 <0f> 0b 
eb fe 0f 0b eb fe 8d b6 00 00 00 00 8d bc 27 00 00 00 00
EIP: [<c10aa0db>] shrink_dcache_for_umount_subtree+0x1db/0x1f0 SS:ESP 
0068:f6f0bf0c
---[ end trace 4d3699434a04d4e5 ]---

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